JP4527136B2 - Wireless transmission device and wireless reception device - Google Patents

Description

  The present invention relates to a radio transmission apparatus and a radio reception apparatus of a frequency hopping radio transmission system and a coded transmission system using a CAZAC code.

  In recent years, a standardization project "3GPP: 3rd Generation Partnership Project" has been examining standards for third generation (3G) mobile communication systems. One of the issues to be studied is a user multiplexing method using CAZAC (Constant Amplitude Zero Auto Correlation) code and a wireless transmission method using frequency hopping.

  In the prior art described in Non-Patent Document 1 and Non-Patent Document 2, each wireless transmission device encodes information to be transmitted using different CAZAC codes. FIG. 8 is a block diagram showing a coding configuration of a conventional radio transmission apparatus. In FIG. 8, a CAZAC code generation unit 400 generates a CAZAC code based on code information (sequence information and shift amount information). The encoding unit 11 encodes data using the CAZAC code and outputs encoded data. The sequence information in the code information is information that specifies a CAZAC sequence used for generating a CAZAC code. The shift amount information in the code information is information that specifies the phase shift amount used for generating the CAZAC code. The code information is fixedly set to be different for each user. Therefore, the same CAZAC code is used during communication of a certain user.

  CAZAC codes generated from different CAZAC sequences are codes with constant amplitude and no autocorrelation. Further, CAZAC codes generated from sequences obtained by phase shifting the same CAZAC sequence have low cross-correlation. In the prior art described in Non-Patent Document 1 and Non-Patent Document 3, user multiplexing is performed by changing the phase shift amount of the CAZAC sequence for each user.

  Non-Patent Document 3 proposes a wireless transmission method using frequency hopping. In the prior art of the frequency hopping radio transmission system described in Non-Patent Document 3, the radio transmission device changes the transmission frequency band to a different radio frequency band at a predetermined time interval. FIG. 9 shows a conceptual diagram of the frequency hopping wireless transmission system. In FIG. 9, the user 1 performs radio transmission using the first radio frequency band in the first period, and uses a second radio frequency band that is different from the first period in the next second period. Use for wireless transmission. As a result, it is expected that the radio channel characteristics are different between the first radio frequency band before hopping and the second radio frequency band after hopping, and when the same information is transmitted before and after frequency hopping, the received signal The frequency diversity effect is obtained by being influenced by different interference, and the wireless communication quality is improved.

  The methods described in Non-Patent Documents 1, 2, and 3 are determined to be applied to the uplink (radio link in the direction from the radio terminal device to the radio base station device) in the 3G mobile communication system in 3GPP.

Non-Patent Document 4 uses a CAZAC code (Zadoff-Chu) generated by phase shifting the same CAZAC sequence for CQI (Channel Quality Indicator) as shown in FIG. Proposes user multiplexing.
3GPP, R1-062742, NTT DoCoMo et al., “CDM-based Multiplexing Method of Multiple ACK / NACK and CQI for E-UTRA Uplink”, October 9-13, 2006 3GPP, R1-050822, Texas Instruments, “On allocation of uplink pilot sub-channels in EUTRA SC-OFDMA”, August 29-September 2, 2005 3GPP, R1-070602, Ericsson, Motorola, Qualcomm, “Data-non-associated control signaling”, January 15-19, 2007 3GPP, R1-072438, NTT-DoCoMo et al, “CDMA-Based Control Signaling Multiplexing in E-UTRA Uplink”, May 7-11, 2007

  However, in the above-described prior art, radio propagation before and after frequency hopping, for example, because the frequency interval of frequency hopping is narrow or the radio channel characteristics in the frequency band before and after frequency hopping are accidentally similar. When the path characteristics are similar, even if frequency hopping is performed, the transmitted signal is affected by the same interference, so that the frequency diversity effect cannot be obtained and the wireless communication quality cannot be improved. There is a fear.

  The present invention has been made in consideration of such circumstances, and its purpose is to provide a case where the radio propagation path characteristics are similar before and after frequency hopping in a radio system that applies a CAZAC code to a frequency hopping radio transmission system. Another object of the present invention is to provide a wireless transmission device and a wireless reception device that can improve wireless communication quality.

  In order to solve the above problems, a wireless transmission device according to the present invention is a wireless transmission device of a frequency hopping wireless transmission method and a coded transmission method using a CAZAC code, and uses different CAZAC codes before and after frequency hopping. It is characterized by comprising an encoding means for performing encoding by using.

The radio transmission apparatus according to the present invention is characterized in that only the phase shift amount constituting the CAZAC code is different before and after frequency hopping.
The radio transmitting apparatus according to the present invention is characterized in that only the CAZAC sequences constituting the CAZAC code are different before and after frequency hopping.
The radio transmission apparatus according to the present invention is characterized in that both the CAZAC sequence constituting the CAZAC code and the phase shift amount are different before and after frequency hopping.

  The wireless transmission device according to the present invention is characterized by comprising CAZAC code change information generating means for generating CAZAC code change information, and code generating means for generating a CAZAC code based on the CAZAC code change information. To do.

In the radio transmission apparatus according to the present invention, the CAZAC code change information represents a change amount with respect to a basic CAZAC sequence or a basic phase shift amount.
In the radio transmission apparatus according to the present invention, the CAZAC code change information represents a CAZAC sequence or a phase shift amount constituting the CAZAC code.

  The radio reception apparatus according to the present invention is a frequency hopping radio transmission system and a radio reception apparatus of an encoded transmission system using a CAZAC code. Decoding means for performing decoding using different CAZAC codes before and after frequency hopping. It is provided with.

The radio reception apparatus according to the present invention is characterized in that only the phase shift amount constituting the CAZAC code is different before and after frequency hopping.
The radio receiving apparatus according to the present invention is characterized in that only the CAZAC sequences constituting the CAZAC code are different before and after frequency hopping.
The radio reception apparatus according to the present invention is characterized in that both the CAZAC sequence constituting the CAZAC code and the phase shift amount are different before and after frequency hopping.

  The radio reception apparatus according to the present invention is characterized by comprising CAZAC code change information generating means for generating CAZAC code change information, and code generating means for generating a CAZAC code based on the CAZAC code change information. To do.

In the radio receiving apparatus according to the present invention, the CAZAC code change information represents a change amount with respect to a basic CAZAC sequence or a basic phase shift amount.
In the radio reception apparatus according to the present invention, the CAZAC code change information represents a CAZAC sequence or a phase shift amount constituting the CAZAC code.

The radio transmission apparatus according to the present invention is a frequency hopping radio transmission system and a code division multiplexing transmission system radio transmission apparatus using a CAZAC code, wherein encoding is performed using different CAZAC codes before and after frequency hopping. Means is provided for each user.
In the radio transmission apparatus according to the present invention, the amount of CAZAC code change before and after frequency hopping is the same among users.
The radio transmission apparatus according to the present invention is characterized in that the amount of change of the CAZAC code before and after frequency hopping differs among users.

The radio reception apparatus according to the present invention is a frequency hopping radio transmission system and a code division multiplexing transmission system radio receiver using a CAZAC code, in which decoding is performed using different CAZAC codes before and after frequency hopping. Means is provided for each user.
In the radio reception apparatus according to the present invention, the amount of CAZAC code change before and after frequency hopping is the same among users.
The radio reception apparatus according to the present invention is characterized in that the amount of change of the CAZAC code before and after frequency hopping differs among users.

  According to the present invention, since signals encoded using different CAZAC codes before and after frequency hopping can be wirelessly transmitted, even if the radio propagation path characteristics are similar before and after frequency hopping, the wireless transmission signal is It can be expected that the influence of the interference received is different. This makes it possible to effectively use radio communication quality improvement techniques such as frequency diversity, and to improve radio communication quality.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The radio system according to the present embodiment employs a frequency hopping radio transmission scheme and an encoded transmission scheme using a CAZAC code. A radio transmission apparatus according to this radio system is shown in FIG. 1, and a radio reception apparatus is shown in FIG.

  FIG. 1 is a block diagram showing an encoding configuration of a wireless transmission device according to an embodiment of the present invention. In FIG. 1, an encoding unit 11 encodes data using a CAZAC code and outputs encoded data (encoded data). The CAZAC code control unit 12 generates a CAZAC code based on code information (sequence information and shift amount information) and change amount information.

  The code information is fixedly set to be different for each user. One code information is set in the radio terminal device (radio transmission device and radio reception device) of one user. Depending on the code information, the combination of the CAZAC sequence and the phase shift amount is set different for each user. In the present embodiment, a CAZAC sequence specified by sequence information in code information is a basic CAZAC sequence (hereinafter referred to as a basic sequence). Similarly, the phase shift amount specified by the shift amount information in the code information is defined as a basic phase shift amount (hereinafter referred to as a basic shift amount).

  The change amount control unit 13 calculates change amount information according to the hopping timing signal. The change amount information represents a change amount with respect to the basic sequence or the basic shift amount. When generating the CAZAC code, the basic sequence or the basic shift amount is changed and used by the change amount indicated by the change amount information. The hopping timing signal notifies the timing (hopping timing) of frequency hopping. The timing for calculating the change amount information includes, for example, a frequency hopping time interval, a fixed multiple of the frequency hopping time interval, a hopping timing that is randomly selected, and the like.

  As a specific configuration example of the change amount control unit 13, for example, an up counter is operated in accordance with a hopping timing signal, and the count value of the up counter to be counted up is output as change amount information. Alternatively, the down counter is operated according to the hopping timing signal, and the count value of the down counter that counts down is output as the change amount information. In both the case of the up counter and the case of the down counter, the counting operation of a predetermined count amount is repeated. The count amount is not particularly limited and may be arbitrarily determined. The initial value and count amount of the counter may be configured to be settable from the outside. Alternatively, a table in which the initial value and the count amount of the counter are recorded may be provided, and the change amount control unit 13 may operate by reading the initial value and the count amount of the counter from the table.

  Another configuration example of the change amount control unit 13 may include an arithmetic unit that calculates a change amount by substituting a variable value generated according to the hopping timing signal into a predetermined calculation formula. Alternatively, a table in which a plurality of change amounts are recorded in association with the arguments may be provided, and the change amounts associated with the argument values generated according to the hopping timing signal may be read from the table.

  The CAZAC code control unit 12 changes the basic sequence or the basic shift amount based on the change amount information, and generates a CAZAC code. Thereby, the CAZAC sequence or phase shift amount of the CAZAC code is changed in accordance with the timing at which the transmission frequency band changes due to frequency hopping.

  FIG. 2 is a block diagram showing a decoding configuration of the radio reception apparatus according to an embodiment of the present invention. The wireless receiving device in FIG. 2 corresponds to the wireless transmitting device in FIG. In FIG. 2, a decoding unit 21 decodes data using a CAZAC code and outputs decoded data (decoded data). The CAZAC code control unit 12 and the change amount control unit 13 have the same configuration as the wireless transmission device in FIG. Thereby, the CAZAC sequence or the phase shift amount of the CAZAC code is changed in accordance with the timing at which the reception frequency band changes due to frequency hopping, as in the wireless transmission device of FIG. In addition, the wireless transmission device and the wireless reception device in which the wireless link is established so that the CAZAC sequence of the CAZAC code or the amount of change in the phase shift amount is the same between the wireless transmission device and the wireless reception device in which the wireless link is established Is configured so that the change amount control units 13 of the wireless transmission device and the wireless reception device take time synchronization to calculate the same change amount information.

  As a result, the CAZAC sequence or phase shift amount of the CAZAC code is changed synchronously between the wireless transmission device and the wireless reception device with which the wireless link is established, in accordance with the timing at which the use frequency band changes due to frequency hopping. The amount of change is the same between the wireless transmission device and the wireless reception device. As a result, the encoding and decoding of the CAZAC code match, and the information restoration succeeds.

  Hereinafter, the CAZAC code control unit 12 shown in FIGS. 1 and 2 will be described with reference to some embodiments.

  FIG. 3 shows a first embodiment of the CAZAC code control unit 12 according to the present invention. In the first embodiment illustrated in FIG. 3, the CAZAC code control unit 12 changes only the basic shift amount using the change amount information, and generates a CAZAC code using the basic sequence and the changed phase shift amount. In FIG. 3, the shift amount calculation unit 31 changes the phase shift amount based on the change amount information to the basic shift amount. The change amount for changing the basic shift amount is determined by the change amount information. In the example of FIG. 3, the change amount based on the change amount information (two steps) from the first step phase shift amount (shift # 1), which is the basic shift amount, to the third step phase shift amount (shift # 3). ) Only the phase shift amount has been changed.

  The code generation unit 32 generates a CAZAC code based on the shift amount information calculated by the shift amount calculation unit 31 and the sequence information indicating the basic sequence. That is, the code generation unit 32 generates a CAZAC code in which the basic sequence is phase-shifted from the basic shift amount by the changed phase shift amount. As a result, a CAZAC code including the basic sequence and the phase shift amount after the change from the basic shift amount is generated. In the example of FIG. 3, a CAZAC code (sequence # 1) composed of a first CAZAC sequence (sequence # 1), which is a basic sequence, and a phase shift amount (shift # 3) after being changed from the basic shift amount (shift # 1). 1, shift # 3) is generated.

  FIG. 4 shows a second embodiment of the CAZAC code control unit 12 according to the present invention. In the second embodiment illustrated in FIG. 4, the CAZAC code control unit 12 changes only the basic sequence using the change amount information, and generates a CAZAC code using the changed CAZAC sequence and the basic shift amount. In FIG. 4, the sequence calculation unit 41 adds a CAZAC sequence change based on the change amount information to the basic sequence. The change amount for changing the basic sequence is determined by the change amount information. In the example of FIG. 4, the CAZAC sequence is changed from the first CAZAC sequence (sequence # 1), which is the basic sequence, to the fifth CAZAC sequence (sequence # 5) by the change amount (four sequences) based on the change amount information. has been edited.

  The code generation unit 32 generates a CAZAC code based on the sequence information calculated by the sequence calculation unit 41 and the shift amount information indicating the basic shift amount. That is, the code generation unit 32 generates a CAZAC code obtained by phase-shifting the CAZAC sequence after the change from the basic sequence by the basic shift amount. As a result, a CAZAC code composed of the changed CAZAC sequence and the basic shift amount is generated from the basic sequence. In the example of FIG. 4, a CAZAC code (sequence) composed of a CAZAC sequence (sequence # 5) after being changed from the basic sequence (sequence # 1) and a first-stage phase shift amount (shift # 1) that is a basic shift amount. # 5, shift # 1) is generated.

  FIG. 5 shows a third embodiment of the CAZAC code control unit 12 according to the present invention. In the third embodiment illustrated in FIG. 5, the CAZAC code control unit 12 changes both the basic sequence and the basic shift amount using the change amount information, and uses the CAZAC sequence after the change and the phase shift amount after the change to use CAZAC. Generate a code. In FIG. 5, the sequence calculation unit 41 adds a CAZAC sequence change based on the change amount information to the basic sequence. The change amount for changing the basic sequence is determined by the change amount information. In the example of FIG. 5, the CAZAC sequence is changed from the first CAZAC sequence (sequence # 1), which is the basic sequence, to the fifth CAZAC sequence (sequence # 5) by the change amount (four sequences) based on the change amount information. has been edited.

  The shift amount calculation unit 31 adds a change in the phase shift amount based on the change amount information to the basic shift amount. The change amount for changing the basic shift amount is determined by the change amount information. In the example of FIG. 5, the change amount based on the change amount information (two steps) from the first step phase shift amount (shift # 1), which is the basic shift amount, to the third step phase shift amount (shift # 3). ) Only the phase shift amount has been changed.

  The code generation unit 32 generates a CAZAC code based on the sequence information calculated by the sequence calculation unit 41 and the shift amount information calculated by the shift amount calculation unit 31. That is, the code generation unit 32 generates a CAZAC code obtained by shifting the CAZAC sequence after the change from the basic sequence by the phase shift amount after the change from the basic shift amount. As a result, a CAZAC code including the CAZAC sequence after the change from the basic sequence and the phase shift amount after the change from the basic shift amount is generated. In the example of FIG. 5, a CAZAC comprising a CAZAC sequence (sequence # 5) after being changed from the basic sequence (sequence # 1) and a phase shift amount (shift # 3) after being changed from the basic shift amount (shift # 1). A code (sequence # 5, shift # 3) is generated.

  Next, a case will be described in which user multiplexing is performed by a code division multiplexing transmission method using a CAZAC code in a wireless system of a frequency hopping wireless transmission method and a coded transmission method using a CAZAC code.

FIG. 6 is a block diagram showing a coding configuration in a radio transmission apparatus of a frequency hopping radio transmission scheme and a CAZAC code division multiplexing transmission scheme according to an embodiment of the present invention. In FIG. 6, parts corresponding to the parts in FIG.
The wireless transmission device illustrated in FIG. 6 includes encoding devices 100 for the number of users (N), a change amount control unit 13A, and a signal adder 110. The encoding apparatus 100 includes the encoding unit 11 and the CAZAC code control unit 12 illustrated in FIG. Each encoding apparatus 100 has the same configuration. The CAZAC code control unit 12 may be any one of the first, second, and third embodiments.

  The change amount control unit 13A calculates change amount information according to the hopping timing signal, similarly to the change amount control unit 13 of FIG. The change amount information calculated by the change amount control unit 13A is sent to each encoding device 100. The change amount information may be the same for all users or may be different for each user. However, the combination of the CAZAC sequence and the phase shift amount used for generating the CAZAC code is made different for each user. This is because user multiplexing is performed by a code division multiplexing transmission method using CAZAC codes.

  Each encoding device 100 generates a CAZAC code based on the user-specific code information and the change amount information received from the change amount control unit 13A, and encodes the data of each user. The signal adder 110 adds the encoded data output from each encoding device 100, and outputs a multiplexed signal as a result of the addition.

  Thereby, if attention is paid to one user, the CAZAC sequence or phase shift amount of the CAZAC code is changed in accordance with the timing at which the transmission frequency band changes due to frequency hopping. That is, before and after a certain frequency hopping, data is encoded using CAZAC sequences or CAZAC codes having different phase shift amounts. As a result, even if the radio propagation path characteristics are similar before and after frequency hopping, the CAZAC code used for encoding is different, so that the influence of interference on the transmitted signal can be expected to be different. As a result, for example, it is possible to obtain a frequency diversity effect and to improve wireless communication quality.

FIG. 7 is a block diagram showing a decoding configuration in a radio receiver of the frequency hopping radio transmission scheme and the CAZAC code division multiplexing transmission scheme according to an embodiment of the present invention. In FIG. 7, parts corresponding to the parts in FIG. 2 are denoted by the same reference numerals.
The radio reception apparatus shown in FIG. 7 includes decoding apparatuses 200 for the number of users (N), a change amount control unit 13A, and a signal duplicator 210. The decoding device 200 includes the decoding unit 21 and the CAZAC code control unit 12 shown in FIG. All the decoding devices 200 have the same configuration. The change amount control unit 13A is the same as that in FIG.

  The signal duplicator 210 duplicates the received signal received by the frequency hopping wireless transmission method, and distributes the same duplicate received signal to all the decoding devices 200. The change amount control unit 13 calculates change amount information according to the hopping timing signal. The change amount information is sent to each decoding device 200.

  Each decoding device 200 generates a CAZAC code based on the user-specific code information and the change amount information received from the change amount control unit 13A, and decodes the duplicate received signal. Thereby, the decrypted data of each user is obtained.

  The CAZAC code control unit 12 and the change amount control unit 13A have the same configuration as that of the transmission side device. In addition, time synchronization is established between the wireless transmission device and the wireless reception device in which the wireless link is established, and the change amount control units 13A of the wireless transmission device and the wireless reception device are synchronized in time, and the same for the same user. It is configured to calculate change amount information. As a result, the CAZAC code CAZAC sequence or the amount of change in the phase shift amount is the same for the same user between the radio transmitting apparatus and the radio receiving apparatus in which the radio link is established, and the CAZAC code encoding and decoding are the same. The information is successfully restored.

  As described above, according to the present embodiment, the CAZAC sequence or phase shift amount of the CAZAC code is changed in accordance with the timing at which the use frequency band changes due to frequency hopping. As a result, signals encoded using different CAZAC codes before and after frequency hopping can be transmitted wirelessly. Therefore, even if the radio propagation path characteristics are similar before and after frequency hopping, the interference of radio transmission signals is reduced. The impact can be expected to be different. As a result, for example, by encoding and transmitting the same data with different CAZAC codes before and after frequency hopping, the received and decoded data before and after frequency hopping become different reception situations, and the frequency diversity effect is achieved. Therefore, it is possible to improve the quality of wireless communication.

  In addition, as a wireless communication quality improvement method other than frequency diversity, for example, a method using an error correction code is known, and this embodiment is applied to error correction encoded data encoded using an error correction code. The CAZAC coding according to may be applied. In this case, the error correction encoded data is encoded using different CAZAC codes before and after frequency hopping. As a result, even if the radio propagation path characteristics are similar before and after frequency hopping, it can be expected that the influence of interference received by the transmitted signal is different, so that the received signals are different from each other before and after frequency hopping. Thus, the error correction results (error rate, error pattern, etc.) can be made different. As a result, the success rate of data reception can be increased, and the quality of wireless communication can be improved.

  Moreover, according to this embodiment, since the effect of smoothing the influence of interference is obtained, it is possible to reduce the transmission power required to obtain a desired communication quality. In addition, the effect of increasing the number of terminals that can be connected simultaneously and the effect of expanding the communication area can be expected.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above-described embodiment, the change amount for the basic sequence or the basic shift amount is calculated and the change is made to the basic sequence or the basic shift amount, but the method for changing the CAZAC code is not limited to this. For example, CAZAC code change that directly generates a CAZAC sequence or phase shift amount used for CAZAC code generation, and changes the generated CAZAC sequence or phase shift amount according to the timing at which the frequency band used changes due to frequency hopping. A control unit may be provided. For example, by having the change amount control unit 13 in FIG. 1 and the shift amount calculation unit 31 in FIG. 3 together, the phase shift amount used for CAZAC code generation is directly generated, and the use frequency band is changed by frequency hopping. The phase shift amount to be generated can be changed according to the above.

  Further, a configuration (change amount control unit or CAZAC code change control unit) for generating CAZAC code change information for changing the CAZAC code may be provided in each radio terminal device, or a radio base station device or the like It may be arranged in a concentrated manner. When intensively providing CAZAC code change information (change amount calculated by the change amount control unit or CAZAC sequence or phase shift amount generated by the CAZAC code change control unit) Distribute to necessary equipment such as station equipment.

  The configuration for generating the CAZAC code change information may be provided only in the transmission side device, and the CAZAC code change information may be sent from the transmission side device to the reception side device. Alternatively, the configuration for generating the CAZAC code change information may be provided only in the reception side device, and the CAZAC code change information may be sent from the reception side device to the transmission side device.

It is a block diagram which shows the encoding structure of the radio | wireless transmitter which concerns on one Embodiment of this invention. It is a block diagram which shows the decoding structure of the radio | wireless receiver which concerns on the same embodiment. It is a block diagram which shows the structure of Example 1 of the CAZAC code | cord control part 12 which concerns on the embodiment. It is a block diagram which shows the structure of Example 2 of the CAZAC code | cord control part 12 which concerns on the embodiment. It is a block diagram which shows the structure of Example 3 of the CAZAC code | cord control part 12 which concerns on the embodiment. It is a block diagram which shows the encoding structure in the radio | wireless transmitter of a frequency hopping radio transmission system and a CAZAC code division multiplexing transmission system based on one Embodiment of this invention. It is a block diagram which shows the decoding structure in the radio | wireless receiver of a frequency hopping radio | wireless transmission system and a CAZAC code division multiplexing transmission system based on one Embodiment of this invention. It is a block diagram which shows the encoding structure of the conventional radio | wireless transmitter. It is a conceptual diagram of a frequency hopping radio transmission system. It is a structural example of the user multiplexing system using the conventional CAZAC code.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Coding part, 12 ... CAZAC code control part, 13, 13A ... Change amount control part, 21 ... Decoding part, 31 ... Shift amount calculation part, 32 ... Code generation part, 41 ... Sequence calculation part, 100 ... Code 110 ... signal adder, 200 ... decoding device, 210 ... signal replicator

Claims (22)

In a frequency hopping wireless transmission method for hopping a transmission frequency band , and a wireless transmission device of a coded transmission method using a CAZAC code,
A radio transmission apparatus comprising encoding means for performing encoding using different CAZAC codes before and after frequency hopping.   The radio transmission apparatus according to claim 1, wherein only a phase shift amount constituting the CAZAC code is different before and after frequency hopping.   The radio transmitting apparatus according to claim 1, wherein only the CAZAC sequences constituting the CAZAC code are different before and after frequency hopping.   The radio transmission apparatus according to claim 1, wherein both the CAZAC sequence and the phase shift amount constituting the CAZAC code are different before and after frequency hopping.   5. The CAZAC code according to claim 1, wherein the CAZAC code is generated based on CAZAC code change information representing a change amount with respect to a basic CAZAC sequence or a basic phase shift amount. The wireless transmission device described in 1.   5. The CAZAC code according to claim 1, wherein the CAZAC code is generated based on a CAZAC sequence constituting the CAZAC code or CAZAC code change information indicating a phase shift amount. 6. Wireless transmitter. CAZAC code change information generating means for generating the CAZAC code change information;
Code generating means for generating a CAZAC code based on the CAZAC code change information generated by the CAZAC code change information generating means;
The wireless transmission device according to claim 5 or 6, further comprising:   The encoding means performs encoding by using different CAZAC codes before and after frequency hopping at every frequency hopping time interval or every fixed multiple of the frequency hopping time interval. The wireless transmission device according to claim 7. In a frequency hopping wireless transmission method for hopping a reception frequency band , and a wireless transmission device of a coded transmission method using a CAZAC code,
A radio receiving apparatus comprising decoding means for decoding using different CAZAC codes before and after frequency hopping.   The radio reception apparatus according to claim 9, wherein only a phase shift amount constituting the CAZAC code is different before and after frequency hopping.   The radio receiving apparatus according to claim 9, wherein only a CAZAC sequence constituting the CAZAC code is different before and after frequency hopping.   The radio reception apparatus according to claim 9, wherein both the CAZAC sequence and the phase shift amount constituting the CAZAC code are different before and after frequency hopping.   13. The CAZAC code according to claim 9, wherein the CAZAC code is generated based on CAZAC code change information indicating a change amount with respect to a basic CAZAC sequence or a basic phase shift amount. The wireless receiving device according to 1.   The CAZAC code is generated based on a CAZAC sequence constituting a CAZAC code or CAZAC code change information representing a phase shift amount. 13. Wireless receiver. CAZAC code change information generating means for generating the CAZAC code change information;
Code generating means for generating a CAZAC code based on the CAZAC code change information generated by the CAZAC code change information generating means;
The wireless receiver according to claim 13 or 14, further comprising:   The decoding means performs decoding by using different CAZAC codes before and after frequency hopping at every frequency hopping time interval or every fixed multiple of the frequency hopping time interval. The wireless receiver according to claim 15. In a frequency hopping radio transmission system that hops a transmission frequency band , and a code division multiplexing transmission system radio transmitter using a CAZAC code,
A radio transmission apparatus characterized in that an encoding unit that performs encoding using different CAZAC codes before and after frequency hopping is provided for each user.   The radio transmission apparatus according to claim 17, wherein the amount of change of the CAZAC code before and after frequency hopping is the same among users.   The wireless transmission device according to claim 17, wherein the amount of change of the CAZAC code before and after frequency hopping differs among users. In a frequency hopping wireless transmission system for hopping a reception frequency band , and a code division multiple transmission wireless receiver using a CAZAC code,
A radio receiving apparatus characterized in that a decoding unit that performs decoding using different CAZAC codes before and after frequency hopping is provided for each user.   The radio reception apparatus according to claim 20, wherein the amount of change of the CAZAC code before and after frequency hopping is the same among users.   The radio reception apparatus according to claim 20, wherein the amount of change of the CAZAC code before and after frequency hopping differs among users.

Images