JP3199341B2 - Spread spectrum wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum radio communication system using a plurality of spread codes.

[0002]

2. Description of the Related Art In wireless communication, there is spread spectrum communication as a communication method excellent in interference resistance, and a method of performing spread spectrum using a plurality of spreading codes as a method of increasing an information transmission speed while keeping a processing gain constant. Was published in
3-283246. FIG. 7 is a diagram illustrating a conventional spread spectrum communication system using a plurality of spread codes. In the figure, 1G is a wireless transmitting station, and 1H is a wireless receiving station. First, the configuration of the wireless transmission station 1G will be described. 7-1 is an information signal to be transmitted, 7-2 is a serial / parallel conversion circuit, 7-3-1 to 7-3-n are spread spectrum circuits, and 7-1-1. 4 is a combining circuit, 7-5 is a transmitter, and 7-6 is a transmitting antenna. Next, the configuration of the wireless receiving station 1H will be described. 7-7 is a receiving antenna, 7-8 is a receiver, and 7-
9-1 to 7-9-n are spectrum despreading circuits, 7-1
0-1 to 7-10-n are demodulation circuits, 7-11 is a parallel / serial conversion circuit, and 7-12 is a demodulated signal.

Next, the principle of the spectrum radio communication system will be described. In the wireless transmission station 1G, the information signal 7-
1 is inputted to the serial / parallel conversion circuit 7-2, each identical having the amount of information and the n pieces of parallel signals S ₁ to S _n having a transmission speed of 1 / n of the original signal 7-1 Is converted. This direct /
N output signals S ₁ to S _n of the parallel converter 7-2, respectively, are input to the spectrum spreading circuit 7-3-1～7-3-n, each different spreading code is multiplied, spread spectrum It is converted into n signals SS ₁ ~ SS _n which made the the. The n spread-spectrum signals SS _{1 to} SS _n are combined by the combining circuit 7-4 and then transmitted by the transmitter 7-5 via the antenna 7-6.

In the radio receiving station 1H, a radio signal is received by a receiver 7-8 via a receiving antenna 7-7, and the received signal is divided into n despread spectrum circuits 7-9-1 to 7-9-1.
7-9-n. The spectrum despreading circuits 7-9-1 to 7-9-n use the spread spectrum circuits 7-3-1 to 7-3-n of the radio transmitting station 1G.
Are subjected to spectrum despreading using the same spreading code as used in the above, and the resulting n output signals are demodulated by demodulation circuits 7-10-1 to 7-10-n, respectively. Then, the n demodulation circuits 7-10-1 to 7-10-7
The output signal of -10-n is input to the parallel / serial conversion circuit 7-11.
According to the reverse procedure performed by the parallel conversion circuit 7-2, n parallel signals are combined into a serial signal and output as a demodulated signal 7-12.

[0005]

[0006]

As described above,
In the conventional spread spectrum wireless communication system, each signal constituting an information signal is transmitted under the same condition regardless of the required quality.

However, the required quality such as a bit error rate, a symbol error rate, and a frame error rate required when transmitting an information signal often differs depending on the type of each signal constituting the information signal to be transmitted. . For this reason, a situation arises in which it becomes difficult to transmit all signals under conditions that satisfy the required quality.

The present invention has been made in view of the circumstances described above, and has as its object to provide a spread spectrum wireless communication system for transmitting a plurality of information signals in a form suitable for each required quality.

[0009]

In order to solve the above-mentioned problems, according to the present invention, when performing spread spectrum on a plurality of information signals in a radio transmitting station, the type of spread code used for spread spectrum is determined by each information. Varies according to the required signal quality.

That is, a spread spectrum radio communication system according to claim 1 receives a plurality of information signals to be transmitted and a quality signal representing a required quality of each information signal, and each of the received signals is a different spreading code. Each of the information signals is multiplied by a spread code selected based on the quality signal to generate a plurality of spread-spectrum signals, and combine the spread-spectrum signals to generate a radio signal of the same frequency band. A radio transmitting station that transmits as a signal and transmits the quality signal or a spreading code designation signal representing the selected spreading code, and a radio signal received from the radio transmitting station, and a quality signal received from the radio transmitting station. Mu each spreading code or the selected on the basis of
The finger is designated by the spread code designation signal received from the line transmission station.
A radio that performs spectrum despreading using specified spreading codes and demodulates the results of these spectrum despreading.
And a receiving station.

According to a second aspect of the present invention, in the spread spectrum wireless communication system , n information signals having transmission speeds V ₁ , V ₂ ,..., V _n (n is an integer of 2 or more) and the required quality of each information signal are determined. And receiving a quality signal representing the quality signal from among a plurality of different spreading codes prepared in advance. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A plurality of spread-spectrum signals are generated by selecting a type of spread code corresponding to the quality signal for each of the information signals, and multiplying each of the information signals by the selected spread code. , transmission radio transmits the spread code designation signal representative of the quality signal or said selected spreading code and transmits these spectra made the signals spread as a radio signal of the synthesized same frequency band
A radio station and a radio signal received from the radio transmission station,
A spectrum using each spread code selected by the same procedure as that of the wireless transmission station based on the quality signal received from the wireless transmission station or each spread code specified by the spread code designation signal received from the wireless transmission station And a radio receiving station that performs despreading and demodulates the result of the spectrum despreading .

According to a third aspect of the present invention, there is provided a spread spectrum radio communication system which receives an information signal to be transmitted and a quality signal representing a required quality of each signal constituting the information signal, and converts the information signal to be transmitted into the information signal. Each signal is divided, and each of the divided signals is multiplied by a spreading code different from each other and of a type selected based on the quality signal, thereby performing spectrum spreading. A plurality of signals are generated, and the signals subjected to the spread spectrum are combined and transmitted as a radio signal in the same frequency band, and the quality signal or the spread code designation signal representing the selected spread code is transmitted.
A radio station and a radio signal received from the radio transmission station,
A spectrum using each spread code selected by the same procedure as that of the wireless transmission station based on the quality signal received from the wireless transmission station or each spread code specified by the spread code designation signal received from the wireless transmission station Radio reception that performs despreading, demodulates the results of these spectrum despreading, and combines the signals obtained by this demodulation.
And a station.

According to a fourth aspect of the present invention, in the spread spectrum wireless communication system , an information signal to be transmitted and a quality signal representing required quality of each signal constituting the information signal are received, and the information signal to be transmitted is transmitted to the information signal. Each of the signals is divided, and each of the divided signals is transmitted at a transmission rate V ₁ , determined based on a required quality represented by the quality signal.
_{V 2, ..., V n (} n is an integer of 2 or more) into a signal having, among the previously prepared respectively mutually different spreading codes, a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A type of spread code corresponding to the quality signal is selected for each of the signals subjected to the conversion of the transmission rate, and each of the signals is multiplied by the selected spread code. Generates the signal of
A radio transmitting station that combines these spread spectrum signals, transmits the combined signal as a radio signal in the same frequency band, and transmits the quality signal or the spreading code designation signal representing the selected spreading code. And before
For the radio signal received from the radio transmission station, each spreading code selected by the same procedure as the radio transmission station based on the quality signal received from the radio transmission station or the spread code designation received from the radio transmission station A procedure in which each of the spectrum despreading using each spreading code specified by the signal is performed, the result of these spectrum despreading is demodulated, and each signal obtained by this demodulation is divided into the information signal in the radio transmitting station. Combine according to the reverse procedure
And a wireless receiving station.

According to a fifth aspect of the present invention, there is provided a spread spectrum wireless communication system according to any one of the first to fourth aspects.
The wireless transmitting station transmits the quality signal or the spread code designation signal to the wireless receiving station as a wireless signal in a frequency band different from a frequency band for transmitting the spread spectrum signal .

In the spread spectrum wireless communication system according to claim 6, a plurality of information signals to be transmitted are received,
Each of the information signals is a different spreading code, and the information signal is multiplied by a spreading code of a type selected based on the required quality of each information signal, thereby generating a plurality of signals subjected to spread spectrum. A radio transmitting station that synthesizes these spread spectrum signals and transmits them as radio signals in the same frequency band, and for a radio signal received from the radio transmitting station, using each spreading code used in the radio transmitting station. A radio receiving station performs each spectrum despreading and demodulates the result of these spectrum despreading.
It is characterized by becoming .

A spread spectrum wireless communication system according to claim 7 receives n information signals having transmission speeds V ₁ , V ₂ ,..., V _n (n is an integer of 2 or more) and prepares them in advance. Out of the mutually different spreading codes: a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. By selecting a type of spreading code corresponding to the required quality of each of the information signals set in advance for each of the information signals, and multiplying each of the information signals by the selected spreading code, a spread spectrum spread signal is obtained. A radio transmitting station that generates a plurality of signals, and combines these spread-spectrum signals and transmits them as radio signals in the same frequency band.
When the relative radio signal received from the wireless transmitting station, said spread spectrum subjected respectively using each spreading code selected by the same procedure as the radio transmission station, a radio receiver for demodulating the results of these de-spread spectrum Be composed of stations
It is characterized by.

In the spread spectrum radio communication system according to the present invention, an information signal to be transmitted is divided into a plurality of signals, and each of the divided signals has a different spreading code. Multiplying each signal by a spreading code of a type selected based on the required quality of each signal to generate a plurality of spread-spectrum signals, combine these spread-spectrum signals, and generate a radio signal of the same frequency band. A radio transmitting station to transmit as a signal, and to the radio signal received from the radio transmitting station , respectively perform spectrum despreading using the same spreading code as the radio transmitting station, and demodulate the results of these spectrum despreading, It consists of a radio receiving station that combines the signals obtained by this demodulation.
And features.

In the spread spectrum radio communication system according to the ninth aspect, an information signal to be transmitted is divided into a plurality of signals, and each divided signal is transmitted at a transmission rate V ₁ determined based on a required quality of each signal. , V ₂ ,..., V _n (n is an integer equal to or greater than 2), and from among different spreading codes prepared in advance, a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A spread code of a type corresponding to the required quality of the signal is selected for each signal subjected to the conversion of the transmission rate, and each signal is multiplied by the selected spread code to perform spread spectrum. A plurality of signals are generated, the signals subjected to the spread spectrum are combined, a wireless transmitting station that transmits the combined signal as a wireless signal in the same frequency band, and a wireless signal received from the wireless transmitting station. On the other hand, the radio transmission station performs spectrum despreading using each spreading code selected in the same procedure as the radio transmission station, demodulates the result of the spectrum despreading, and converts each signal obtained by the demodulation to the radio transmission station. And synthesizes the information signals according to the reverse procedure
And a radio receiving station.

[0019]

According to the spread spectrum radio communication system of the first aspect, the radio transmitting station, based on the quality signal,
Spread spectrum is performed on each information signal using a spreading code of a type appropriate to the required quality of each information signal, and a plurality of spread-spectrum signals are generated. Then, these spread-spectrum signals are combined and transmitted as a radio signal in the same frequency band, and the quality signal or a spread code designation signal representing the selected spread code is transmitted. Then, the radio receiving station specifies , for the radio signal received from the radio transmitting station, each spreading code selected based on the quality signal received from the radio transmitting station or the spread code designation received from the radio transmitting station.
Spectrum despreading is performed using each spread code specified by the signal, and the results of these spectrum despreads are demodulated. As described above, according to the spread spectrum wireless communication system, even when a plurality of information signals having different required qualities are handled, each information signal can be transmitted under a condition satisfying the required quality specified by the quality signal.

According to the spread spectrum radio communication system of the present invention, the radio transmission station transmits the transmission speeds V ₁ , V ₂ ,
.., V _n (n is an integer of 2 or more), for each of the n information signals, a spreading type having a spreading factor suitable for the transmission rate of each information signal and a type suitable for the required quality of each information signal. Codes are selected, spectrum spreading is performed using these selected spreading codes, and the results are combined and transmitted. Then, the radio receiving station performs spectrum despreading on the radio signal received from the radio transmitting station using the same spreading code as each spreading code used in the radio transmitting station, and demodulates the result. As described above, according to the spread spectrum wireless communication system, each information signal having a different transmission rate can be transmitted under a condition that satisfies the required quality specified by the quality signal.

According to the spread spectrum wireless communication system of the present invention, the information signal to be transmitted is divided into a plurality of signals at the radio transmitting station, and each of the divided signals is based on the quality signal. In this way, a type of spreading code corresponding to the required quality of each signal is selected, spectrum spreading is performed using these spreading codes, and the results are combined and transmitted. Then, the radio receiving station performs spectrum despreading on the radio signal received from the radio transmitting station using the same spreading code as each spreading code used in the radio transmitting station, and demodulates and combines the results. As described above, according to the spread spectrum wireless communication system , even when the required quality of each signal constituting the information signal is different ,
By designating the required quality of each signal by the quality signal, each signal can be transmitted under conditions that satisfy the required quality.

According to the spread spectrum radio communication system of the present invention, in the radio transmitting station, the information signal to be transmitted is divided into a plurality of signals, and each of the divided signals is based on the quality signal. transmission speed V _1, V ₂ commensurate with the required quality of each Te, ..., V _n (n is an integer of 2 or more) is converted into a signal having, for converted the signals of the transmission rate, each transmission speed And a spreading code of a type suitable for each required quality is selected.
Spread spectrum is performed by the selected spreading code,
The results are combined and transmitted. Then, the radio receiving station performs spectrum despreading on the radio signal received from the radio transmitting station using the same spreading code as each spreading code used in the radio transmitting station, and demodulates the result.
Synthesized. As described above, according to the spread spectrum wireless communication system , even when the required quality of each signal constituting the information signal is different , by specifying the required quality of each signal by the quality signal, as a condition for transmission of each signal, The processing gain and the type of spreading code that satisfy the required quality are selected, and each signal can be transmitted under the selected conditions.

In the spread spectrum radio communication system according to claim 5, the quality signal or the spread code designation signal is:
The signal is transmitted from the radio transmitting station to the radio receiving station using a frequency band different from the transmission frequency band of the spread spectrum signal.

According to the spread spectrum radio communication system of the present invention, the quality of the quality signal or the like is not exchanged between the radio transmitting station and the radio receiving station under various preset conditions. An operation similar to that of the spread spectrum wireless communication system according to claims 1 to 4 is performed.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. A. First Embodiment (1) Configuration of Embodiment FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention. In the figure, 1A is a wireless transmitting station, and 1B is a wireless receiving station. In the wireless transmitting station 1A, 1-1 is an information signal to be transmitted, 1-2 is a serial / parallel conversion circuit, and 1-3-1 to 1-3-1.
1-3-n is a spread spectrum circuit, 1-4 is a spread code selection circuit, 1-5 is a synthesis circuit, 1-6 is a transmitter, 1-7
Is a transmitting antenna. In the wireless receiving station 1B, 1-8 is a receiving antenna, 1-9 is a receiver, 1-10
-1 to 1-10-n are spectrum despreading circuits, 1-1
1-1 to 1-11-n are demodulation circuits, 1-12 is a parallel / serial conversion circuit, and 1-13 is a demodulated signal.

[0026] (2) Operation information signals 1-1 embodiment is divided into a serial / transmission speed by a parallel conversion circuit 1-2 is equal to n pieces of information signals S ₁ to S _n.
These information signals S ₁ to S _n have the same frequency bandwidth since each transmission speed are equal. Each information signal S _{1 to} S
_n is a spread spectrum circuit 1-3-1 to 1-3, respectively.
-N.

On the other hand, with respect to spreading code selecting circuit 1-4, quality signal representing the required quality of each information signal S ₁ to S _n is given from time to time. As a result, the spreading code selection circuit 1-4
Spreading code specification signal to specify the type of the spreading code commensurate with the required quality for each of the information signals S ₁ to S _n are output, the spectrum spreading circuit 1-3 for performing spread spectrum of each information signal S ₁ to S _n -1 to 1-3-n. Then, each of the spread spectrum circuits 1-3-1 to 1-3-1
In -3-n, a spread spectrum of the information signal S ₁ to S _n is performed using the spreading code of the specified kind with a spread code designation signal from the spreading code selecting circuit 1-4.

[0028] n signals SS ₁ ~ SS _n has been made of the spread spectrum obtained in this manner is supplied to the transmitter 1-6 is transmitted from the transmitting antenna 1-7 as a radio signal of the same frequency band You. Further, the spreading code specification signal for specifying the spread code used for spectrum spreading of each information signal S ₁ to S _n are sent from the spread code selection circuit 1-4 to the transmitter 1-6, the output of the synthesis circuit 1-5 It is transmitted as a radio signal in a frequency band different from the transmission frequency band when transmitting the signal.

Then, in the radio receiving station 1B, the radio signal subjected to spread spectrum is received by the receiver 1-9 via the receiving antenna 1-8, and the received signal is transmitted to n despreading circuits 1-10-. 1 to 1-10-n. Further, the spreading code specification signal corresponding to the respective information signals S ₁ to S _n are received by the receiver 1-9, despreading circuit 1-1
0-1 to 1-10-n. In these despreading circuits 1-10-1 to 1-10-n, spectrum despreading is performed using a type of spreading code specified by each spreading code specifying signal. In this way, the radio receiving station 1B performs despreading with the same spreading code as that of the radio transmitting station 1A. As a result, the n output signals obtained from the spectrum despreading circuits 1-10-1 to 1-10-n are demodulated by the demodulation circuits 1-11-1 to 1-11-1, respectively.
It is input to 1-11-n and demodulated. Each output signal of the demodulation circuits 1-11-1 to 1-11-n is converted into a serial signal by the parallel / serial conversion circuit 1-12 and output as a demodulated signal.

B. Second Embodiment FIG. 2 is a block diagram showing a configuration of a second embodiment of the present invention. In the figure, 1C is a wireless transmitting station, and 1D is a wireless receiving station. In the wireless transmission station 1C, 2-1 is an information signal to be transmitted, 2-2 is a signal dividing circuit, and 2-3-1 to 2-2-1.
3-n is a spread spectrum circuit, 2-4 is a spread code selection circuit, 2-5 is a synthesis circuit, 2-6 is a transmitter, and 2-7 is a transmission antenna. In the radio receiving station 1D, 2
-8 is a receiving antenna, 2-9 is a receiver, 2-10-1 to
2-10-n is a spectrum despreading circuit, 2-11-1
2-11-n is a demodulation circuit, 2-12 is a signal synthesis circuit,
2-13 is a demodulated signal. The configuration of the present embodiment differs from that of the first embodiment in the following points.

A. The point that the serial / parallel conversion circuit 1-2 in the first embodiment is replaced by a signal division circuit 2-2 that divides an information signal into a plurality of information signals having a designated transmission rate. b. The parallel / serial conversion circuit 1-12 is a signal synthesis circuit 2-12.
Is replaced by c. A point that the spreading code selection circuit 2-4 determines the transmission speed of each information signal output from the signal division circuit 2-2 based on the quality signal.

<Configuration Example of Signal Dividing Circuit> FIG. 3 is a diagram for explaining a signal dividing process performed by the signal dividing circuit 3-2 in the present embodiment. In this signal division process,
At regular time intervals, an information signal input during that time (see FIG. 3)
(A)) is divided into a plurality of information signals D _{1 to} D _n (FIG. 3)
(B)). Then, these information signals D _{1 to} D _n are output within a fixed time irrespective of the amount of information (FIG. 3).
(C)). Therefore, an information signal having a large amount of information among the divided information signals is output at a high transmission rate, and an information signal having a small amount of information is output at a low transmission rate.
Based on the quality signal, the above-mentioned spread code selection circuit 2-4 divides a portion having a high required quality among signals constituting each information signal into a signal having a small amount of information, and a portion having a low required quality is a signal having a large amount of information. Is sent to the signal dividing circuit 2-2 to divide the original information signal 2-1. The signal dividing circuit 2-2 divides the information signal 2-1 according to the division specifying information sent in this way.

FIG. 4 shows a specific configuration example of a circuit for performing the signal division processing. In the figure, 4-1 is a serial / parallel conversion circuit, and 4-2 is a synthesis circuit. Transmission speed of 3a (bp
The signal represented by s) is converted into a signal of 2a (bps) and a
(Bps). The information signal is input to the serial / parallel conversion circuit 4-1 and converted into three signals whose transmission speeds are represented by a (bps). Two of the three signals are input to the synthesis circuit 4-2. The signal is then combined with a signal whose transmission speed is represented by 2a (bps). As described above, the information signal 2-
In the case of dividing 1 into an arbitrary amount of information, switch means for switching the connection relationship between the serial-parallel conversion circuit 4-1 and the combining circuit 4-2 according to the division designation information may be provided.

(2) Operation of the Embodiment The information signal 2-1 is input to the signal dividing circuit 2-2.
On the other hand, a quality signal representing the required quality of each part of each information signal is supplied to the spreading code selection circuit 2-4 as needed. As a result, the spread code selection circuit 2-4 generates division designation information for performing signal division in consideration of the required quality of each unit with respect to the information signal, and sends the information to the signal division circuit 2-2. Then, the information signal is divided into _n information signals S _{1 to} Sn based on the division designation information from the signal division circuit 2-2, and a portion of the information signal 2-1 having a high required quality has a small amount of information. Divided into groups of signals (that is, subdivided)
The parts with low required quality are divided into groups of signals with a large amount of information (that is, roughly divided).

Further, spreading factor to be applied to the information signal S ₁ to S _n by spreading code selecting circuit 2-4 is obtained. More specifically, when the transmission speed of the _n information signals S _{1 to} Sn divided by the division designation information is V ₁ , V ₂ ,..., V _n , V ₁ · K ₁ = V ₂ · K ₂ = ... = spreading factor K ₁ ~K _n which satisfies V _n · K _n is determined, information that specifies these spreading factor are sent to the spectrum spreading circuit 2-3-1~2-3-n.

Furthermore the spreading code selecting circuit 2-4 kinds of spread codes to be applied to the information signal S ₁ to S _n on the basis of the quality information is determined. Further More specifically, spreading code selecting circuit 2-4, for having high required quality of the n information signals S ₁ to S _n, the quality of each type of spread codes prepared in advance A suitable type of spreading code is assigned to the transmission, and the remaining type of spreading code is assigned to a signal of low required quality. Then, send a spreading code designation information designating a type of spreading codes assigned to the information signal S ₁ to S _n in each spread spectrum circuits 2-3-1~2-3-n.

Each spread spectrum circuit 2-3-1 to 2-
In 3-n, the type specified by the spreading code selecting circuit 1-4, a spread spectrum of the information signal S ₁ to S _n are performed each using a spreading code of spreading factor. Here, the transmission rate of the spread spectrum signal SS ₁ ~ SS _n is spreading factor K ₁ of ~K _n applied to the transmission speed V ₁ ~V _n and each of the previous signal S ₁ to S _n to be spread Expressed as a product. Therefore, although the transmission speed of the signal SS _i after being spread spectrum is expressed as _{V i × K i, V 1} × K 1 = V 2 × K 2 = ... = n -number of so is V _n × Kn Spread spectrum circuit 3-3-1-3-3-3-
The transmission speeds of the _n output signals SS _{1 to} SS _n are all equal and can be transmitted as signals in the same frequency band.

[0038] n signals SS ₁ ~ SS _n has been made of the spread spectrum obtained in this way, the synthesizing circuit 2-5
After that, the signal is supplied to the transmitter 2-6 and transmitted from the transmission antenna 2-7 as a radio signal in the same frequency band. Further, the above-mentioned division specifying information and the spreading code specifying signal are transmitted from the spreading code selecting circuit 2-4 to the transmitter 2-6, and the frequency band different from the transmitting frequency band when transmitting the output signal of the synthesizing circuit 1-5. Is transmitted as a wireless signal.

In the radio receiving station 1D, the radio signal subjected to spread spectrum is received by the receiver 2-9 via the receiving antenna 2-8, and the received signal is transmitted to the n despreading circuits 2-10- 1-2-2-n. Further, the spreading code specification signal and division designation signal is received by the receiver 2-9, the information signal S ₁ to S _n spread code designation signal despreading circuit corresponding to 2-10-1～2-1
0-n. In these despreading circuits 2-10-1 to 2-10-n, spectrum despreading is performed using a type of spreading code specified by each spreading code specifying signal. Thus, the wireless receiving station 1
In D, despreading is performed with the same spreading code as that of the radio transmitting station 1C. As a result, n output signals obtained from the spectrum despreading circuits 2-10-1 to 2-10-n are input to the demodulation circuits 2-11-1 to 2-11-n, respectively, and demodulated. . Then, the demodulation circuits 2-11-2 to
Each output signal of 1-11-n is provided to the signal synthesis circuit 2-12. Here, the division designation signal received by the receiver 2-9 is supplied to the signal synthesis circuit 2-12. Signal combining circuit 2-12, based on the division designation information, the information signal 2-1 in the radio transmission station 1C information signal S ₁ ~
Demodulation circuit in exactly the reverse procedure as divided into S _n 2-11-
The output signals 2-1-11-n are combined to output a demodulated signal 1-13 representing the original information signal 2-12.

C. Third Embodiment (1) Configuration of Embodiment FIG. 5 is a block diagram showing a configuration of a third embodiment of the present invention. In the figure, 1E is a wireless transmitting station, and 1F is a wireless receiving station. In the radio transmitting station 1E, 5-1-1 to 5-
1-n is an information signal to be transmitted, 5-2 is a spread code selection circuit, 5-3-1 to 5-3-n are spread spectrum circuits, 5-4 is a synthesis circuit, 5-5 is a transmitter, 5-6 is a transmitting antenna. Also, in the radio receiving station 1F, 5-
7 is a receiving antenna, 5-8 is a receiver, 5-9-1 to 5-
9-n is a despreading circuit, 5-10-1 to 5-10-n are demodulation circuits, and 5-11-1 to 5-11-n are demodulated signals.

(2) Operation of Embodiment In the above-described second embodiment, one information signal is divided and spread spectrum is performed. However, in this embodiment, the radio transmission station 1E has a transmission speed of V _{1 to} V _n. A plurality of information signals 5-1
-1 to 5-1-n are accepted, and spectrum spreading is performed on them using a spreading code having a spreading factor inversely proportional to each transmission rate. At the time of this spread spectrum, the spread code selection circuit 5-2 determines the type of spread code matching each required quality according to the plurality of information signals 5-1-1 to 5-1-n specified by the quality signal. specify. That is, in the radio transmitting station 1E, a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A type of spreading code corresponding to the quality signal is selected for each information signal, and spectrum spreading is performed by the selected spreading code.

In the radio transmitting station 1E, each information signal 5
A spread code designating signal designating the spread code used for the spread spectrum of -1-1 to 5-1-n is sent from the spread code selection circuit 5-2 to the transmitter 5-5, and the output of the synthesis circuit 5-4 It is transmitted as a radio signal in a frequency band different from the transmission frequency band when transmitting the signal. And the wireless receiving station 1F
Then, each information signal subjected to spectrum spreading and a spreading code designation signal are received by the receiver 5-8. Each of the spread spectrum information signals is subjected to spectrum despreading using the same spreading code as that of the wireless transmission station based on the spreading code designation signal, and is demodulated by the demodulation circuits 5-10-1 to 5-10-1.
Demodulated by 5-10-n.

D. Spreading Code FIG. 6 shows an example of an autocorrelation function of a spreading code used in the present invention. In the figure, (a) shows the autocorrelation function of the M sequence, and (b) shows the autocorrelation function of the Gold sequence. M
In a sequence, a correlation peak occurs at only one point, but in a gold sequence, a plurality of correlation peaks occur, so that transmission characteristics deteriorate. Therefore, signals with different required qualities can be transmitted by allocating an M sequence to a signal with a high required quality and allocating and spreading a Gold sequence to a signal with a low required quality. Note that the spreading code is not limited to the M sequence and the Gold sequence, but may be a sequence such as a bulk sequence, a Bent sequence, a JPL sequence, a polyphase sequence, a real-valued sequence, a Walsh sequence, or a combination of these sequences. For example, a sequence of the product of the Walsh sequence and the M sequence, or a sequence of the product of the Walsh sequence and the Gold sequence may be used.

D. Another Embodiment The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and for example, the following modifications are possible.

In each of the above embodiments, the spread code information or the division designation information is transmitted from the radio transmitting station to the radio receiving station, so that the spectrum despreading corresponding to the spread spectrum at the radio transmitting station or the signal division at the radio transmitting station can be performed. The corresponding signal synthesis is performed at the wireless receiving station, but instead of such information, a quality signal is sent to the wireless receiving station, and the wireless receiving station performs signal division performed at the wireless transmitting station based on the quality signal. Alternatively, the manner of determining the spreading code may be estimated. Instead of giving the quality information as needed, the quality information may be set when the wireless transmitting station and the wireless receiving station are installed, and thereafter, the operation may be performed according to the previously set quality information as in the above embodiments. In each of the above embodiments, the example in which the spread spectrum circuit and the inverse spread spectrum circuit are configured in the baseband band has been described. However, the same effect can be obtained in the circuit in the intermediate frequency band.

[0046]

As described above, according to the present invention,
Since a plurality of signals after the spread spectrum are transmitted by the spreading code in consideration of each required quality, an effect that each information signal having a different required quality can be transmitted so as to satisfy each required quality can be obtained. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a spread spectrum wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a spread spectrum wireless communication system according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating signal division processing performed in the embodiment.

FIG. 4 is a diagram illustrating a configuration example of a signal dividing circuit according to the embodiment.

FIG. 5 is a block diagram illustrating a spread spectrum wireless communication system according to a third embodiment of the present invention.

FIG. 6 is a diagram illustrating a spread code according to the present invention.

FIG. 7 is a diagram illustrating a conventional spread spectrum wireless communication system.

[Explanation of symbols]

1-1 ... information signal, 1-2 ... serial / parallel conversion circuit, 1
−3-1 to 1-3-n... Spread spectrum circuit, 1-
4 ... Spreading code selection circuit, 1-5 ... Synthesis circuit, 1-6
... Transmitter 1-7 Transmit antenna 1-8 Receive antenna 1-9 Receiver 1-10-1 to 1-10
-N ... despreading circuit, 1-1-1 to 1-11-n ...
Demodulation circuit, 1-12 ... parallel / serial conversion circuit, 1-13 ...
... Demodulated signal.

(56) References JP-A-6-204969 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/69-1/713 H04J 13/00-13 / 06

Claims (9)

(57) [Claims] An information processing apparatus receives a plurality of information signals to be transmitted and a quality signal representing a required quality of each information signal, and generates spreading codes different from one another based on the quality signals. By multiplying each of the information signals, a plurality of spread-spectrum signals are generated, and these spread-spectrum signals are combined and transmitted as a radio signal in the same frequency band, and the quality signal or the selected signal is transmitted. and a radio transmission station that transmits a spread code designation signal representing the spreading code, said the radio signal received from the radio transmission station, the spreading code or the radio selected based on the quality signal received from the radio transmission station The spreading code received from the transmitting station
A spread- spectrum wireless communication system, comprising: a wireless receiving station that performs spectrum despreading using a spreading code designated by a designated signal and demodulates the result of the spectrum despreading. 2. Receiving n information signals having transmission speeds V ₁ , V ₂ ,..., V _n (n is an integer of 2 or more) and quality signals indicating required quality of each information signal, and preparing them in advance. Out of the mutually different spreading codes: a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A plurality of spread-spectrum signals are generated by selecting a type of spread code corresponding to the quality signal for each of the information signals, and multiplying each of the information signals by the selected spread code. , transmission radio transmits the spread code designation signal representative of the quality signal or said selected spreading code and transmits these spectra made the signals spread as a radio signal of the synthesized same frequency band
And Shin station, the wireless signal received from the radio transmission station, received from each spreading code or the radio transmission station selected by the same procedure as the radio transmission station based on the quality signal received from the radio transmission station A radio which performs spectrum despreading using each spreading code designated by the spreading code designation signal and demodulates the result of the spectrum despreading.
A spread spectrum wireless communication system characterized by comprising a receiving station . 3. A receive quality signal representing the required quality of signals constituting the information signal and the transmission should do information signal, dividing the information signal to be the transmission on the respective signals, each being these divided By multiplying each of the signals by a spreading code different from each other and of a type selected based on the quality signal, a plurality of spread-spectrum signals are generated to generate a plurality of spread-spectrum signals. radio send and made signal synthesizing transmits a spread code designation signal representative of the quality signal or said selected spreading code and transmits a radio signal in the same frequency band of
And Shin station, the wireless signal received from the radio transmission station, received from each spreading code or the radio transmission station selected by the same procedure as the radio transmission station based on the quality signal received from the radio transmission station subjecting each spectrum despreading using each spreading code specified by the spreading code specification signal, demodulates the results of these inverse spectrum spread, and a wireless receiving station for combining the signals obtained by the demodulation
A spread spectrum wireless communication system characterized by: 4. receives a quality signal representing the required quality of signals constituting the information signal and the transmission should do information signals, each signal divided with dividing the information signal to be the transmission on the respective signals Each of the transmission rates V ₁ , determined based on the required quality represented by the quality signal,
_{V 2, ..., V n (} n is an integer of 2 or more) into a signal having, among the previously prepared respectively mutually different spreading codes, a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A type of spread code corresponding to the quality signal is selected for each of the signals subjected to the conversion of the transmission rate, and each of the signals is multiplied by the selected spread code. Generates the signal of
A radio transmitting station that combines these spread spectrum signals, transmits the combined signal as a radio signal in the same frequency band, and transmits the quality signal or the spreading code designation signal representing the selected spreading code. When the relative radio signal received from the wireless transmitting station, the received from the spreading code or the radio transmission station selected by the same procedure as the radio transmission station based on the quality signal received from the radio transmission station spread Each of the spectrum despreading using each spreading code designated by the code designation signal is performed, the result of these spectrum despreading is demodulated, and each signal obtained by the demodulation is divided into the information signal at the radio transmitting station. Combine according to the reverse procedure
A spread spectrum wireless communication system comprising a wireless receiving station . 5. The radio transmitting station transmits the quality signal or the spread code designation signal to the radio receiving station as a radio signal of a frequency band different from a frequency band for transmitting the spread spectrum signal. The spread spectrum wireless communication system according to any one of claims 1 to 4 , characterized in that: 6. Receiving a plurality of information signals to be transmitted ,
Each of the information signals is a different spreading code, and the information signal is multiplied by a spreading code of a type selected based on the required quality of each information signal, thereby generating a plurality of signals subjected to spread spectrum. a radio transmission station that transmits these spectra made the signals spread as a radio signal of the synthesized the same frequency band, the wireless signal received from the radio transmission station, using each spreading code used in the wireless transmitting station A spread-spectrum wireless communication system, comprising: a wireless receiving station that performs each of the spectrum despreading and demodulates the result of the spectrum despreading. 7. Receiving n information signals having transmission speeds V ₁ , V ₂ ,..., V _n (n is an integer of 2 or more), and a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. By selecting a type of spreading code corresponding to the required quality of each of the information signals set in advance for each of the information signals, and multiplying each of the information signals by the selected spreading code, a spread spectrum spread signal is obtained. A radio transmitting station that generates a plurality of signals, and combines these spread-spectrum signals and transmits them as radio signals in the same frequency band.
When the relative radio signal received from the wireless transmitting station, said spread spectrum subjected respectively using each spreading code selected by the same procedure as the radio transmission station, a radio receiver for demodulating the results of these de-spread spectrum A spread spectrum wireless communication system characterized by comprising a station . 8. An information signal to be transmitted is divided into a plurality of signals, and each of the divided signals is a spreading code different from each other and selected based on required quality of each signal. by multiplying each of the kinds of spreading codes to generate a plurality of signals subjected to the spread spectrum, and a radio transmission station that transmits a signal which has been made of these spread-spectrum as the radio signals of the synthesized the same frequency band, the wireless transmitting For the radio signal received from the station, perform each spectrum despreading using the same spreading code as the radio transmitting station, demodulate the results of these spectrum despreading,
A radio receiving station that combines the signals obtained by this demodulation ,
A spread spectrum wireless communication system characterized by comprising: 9. An information signal to be transmitted is divided into a plurality of signals, and each of the divided signals is transmitted at a transmission speed V ₁ , V ₂ ,..., V _n (n is 2) determined on the basis of required quality. Is converted into a signal having the above-mentioned integer), and from among mutually different spreading codes prepared in advance, a. _{V 1 · K 1 = V 2} · K 2 = ...... = V n · K n spreading factor K ₁ which satisfies the condition that, K _2, ..., each have a K _n, and, b. A spread code of a type corresponding to the required quality of the signal is selected for each signal subjected to the conversion of the transmission rate, and each signal is multiplied by the selected spread code to perform spread spectrum. a plurality of signals generated was to synthesize these spectra made signal diffusion, and a radio transmission station that transmits the synthesized signal as a radio signal of the same frequency band, the radio signal received from the radio transmission station On the other hand, the radio transmission station performs spectrum despreading using each spreading code selected in the same procedure as the radio transmission station, demodulates the result of the spectrum despreading, and converts each signal obtained by the demodulation to the radio transmission station. spread spectrum wireless communication system, characterized by comprising a wireless receiving station that synthesized according to the procedure of divided steps in the reverse order of the information signals in.