JP3203524B2 - TDMA diversity wireless reception 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 TDMA (time division multiple access) transmission system, in which each data received by a plurality of receivers on a receiving side is processed by utilizing the idle time of the TDMA, and errors are detected. TDMA to select less data
The present invention relates to a diversity radio reception system.

[0002]

2. Description of the Related Art Diversity reception according to the prior art utilizes a plurality of received signals having little correlation in order to reduce the effects of multipath fading, rain attenuation, and the like. This is a technique for maintaining good reception signal quality by using the reception wave of (1).
This includes a selection method of selecting a received wave of a higher level according to a reception level, and an equal gain combining method of combining received waves after making all received wave phases in phase. The combining method needs to match the phase of the received signal, and it has been difficult to apply the method to mobile communication in which the received wave fluctuates at high speed. Although the selection method has inferior characteristics to the synthesis method, the selection method is often used because it can be easily realized.

[0003]

However, in the spatial diversity using the above-described conventional selection method, a sufficient diversity effect can be obtained because a delay occurs at the time of selection switching and it is not possible to follow a variation in reception level. There was no problem. or,
Since only the signal of one branch having the highest reception level is always received, there is a problem that even if a signal of a high level is received in another branch, the signal cannot be used.

A space diver using a conventional selection method is also disclosed.
In Sichi, a plurality of decoders for error correction and error detection are required to obtain data for each receiver, and there has been a problem that the configuration of the apparatus becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a TDMA diversity wireless reception system which eliminates the above problems and is not easily affected by fading.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an error correction coding means on a transmitting side and a receiving side.
TDMA diversity radio receiver having two receiving means
Data received by the two receiving means in the communication system
Either is the time of one TDMA time slot
Shift and insert the shifted data in the TDMA idle time.
And a combining means for combining the data into one continuous data series.
Only, synthesized data into a single data sequence by the combining means
And decoding means for decoding the data.
Error rates, compare their respective error rates, and
A means for selecting data that does not exist.

[0007]

According to the present invention, by adopting the above structure,
By delaying the received data and combining both data
This makes it possible to use the idle time of TDMA.
In addition, the conventional diversity receiving method requires a plurality of decoding means.
Needed, but by decrypting the combined data
Thus, the configuration can be simplified with one decoding unit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. As shown, the TDMA diver of the present invention
In the Siti wireless reception system, the transmitting side is composed of an encoding unit 1, a transmitting unit 2, and an antenna 3, and the receiving side is an antenna 4a, an antenna 4b, a receiving unit 5a, a receiving unit 5b, a memory 6a, a memory 6b, a combining unit 7 , Decoding unit 8 and comparing unit 9.

FIG. 2 shows the flow of data until transmission data is received and determined. In this embodiment, the error correction code is (7, 4) BCH as an example, and two-channel TDM
A transmission will be described. The data is encoded by the encoding means 1 on the transmission side, so that error correction and error detection can be performed at the time of reception.
In this example, since the code length of the code is 7 bits, each symbol shown in FIG. 2 corresponds to 7 bits.

The transmitted data S1 (d1 to d4) are received by the antennas 4a and 4b, and are received by the receiving units 5a and 5b.
The data is demodulated and A / D converted, and becomes received data S1a (A1 to A4) and S1b (B1 to B4) shown in FIG. Since the data transmission interval of one channel is set to 7 bits, these received data S1a (A1 to A4), S1
Data corresponding to each symbol b (B1 to B4) is stored in the memory units 6a and 6b as 7 bits. Memory unit 6b
The data stored in the memory section 6 is delayed by a time corresponding to 7 bits (one time slot), and is synthesized by the synthesizing section 7 with the data of the memory section 6a.

The delay data is sequentially output, and is switched every seven bits by the synthesizer 4, and the synthesized data S3 (A1
To B4) are obtained. Further, the decoding unit 8 obtains decoded data S4. Combined data S3 and decoded data S4
In (D1 to D8), two data obtained from the same transmission data are continuous. Two consecutive decoded data (D
1 and D2, D3 and D4, D5 and D6, D7 and D8)
The respective data are compared by the comparing unit 9 to obtain comparison data S5 (D1, D3, D5, D7) with few errors.

[0012]

[0013]

[0014]

As described above, according to the present invention, the following excellent effects are expected. By delaying one of the received data and combining both data,
It is possible to use the idle time of TDMA. Also, the conventional diversity receiving method required a plurality of decoding means , but by decoding the combined data,
The configuration can be simplified with one decoding means .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a TDMA diversity wireless reception system according to the present invention.

FIG. 2 is a diagram showing a flow of data until transmission data is received and determined.

[Explanation of symbols]

 Reference Signs List 1 encoding means 2 transmitting means 3 antenna 4a antenna 4b antenna 5a receiving unit 5b receiving unit 6a memory 6b memory 7 combining unit 8 decoding unit 9 comparing unit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-167482 (JP, A) JP-A-6-77942 (JP, A) JP-A-6-77941 (JP, A) JP-A-54-1979 56312 (JP, A) JP-A-60-217747 (JP, A) JP-A-5-29992 (JP, A) JP-A-5-29993 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00 H04L 1/02 H04L 1/00 H04B 7/02

Claims (1)

(57) [Claims] [Claim 1 further comprising error correction encoding means to the transmitting side, receiving
In TDMA diversity radio receiving system which have the two receiving means to signal side, either one of data received by the two receiving means shifted by time of the TDMA in one time slot, TDM
Insert the data obtained by shifting the spare time of the A 1 consecutive
And the provided combining means for combining the data sequence, the provided decoding means for decoding the combined data into a single data sequence in combining means, obtains the error rate of each data said decoding, compares the respective error rates Characterized in that a means for selecting data with the least error is provided.
A Diversity wireless reception system.