JP2002344358A - System and method for parallel transmission in cdma - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of the quality of a transmission system caused by burst error and caused by the increase of puncturing. SOLUTION: The parallel transmission system in CDMA, where transmission and reception of data are performed by the diffusion and reverse diffusion with diffusion codes, is equipped with transmitter-receiver 20 and 40 which synthesize the same several data obtained by diffusing and transmitting the same data to be distributed into plural pieces with different diffusion codes and reversely diffusing the input signals with diffusion codes, and number-of- diffusion-codes controllers 28 and 50 which close-loop-control the number of diffusion codes for performing the diffusion or reverse diffusion of the same several data distributed into plural pieces, according to the quality of circuits at the time of having received the same several data with a transmitting- receiving section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code).
Division Multiple Access)
And a parallel transmission system. In particular, the present invention
The present invention relates to a parallel transmission system and method in CDMA that can improve line quality against burst errors and at the same time prevent transmission signal quality deterioration due to a puncturing rate that increases when a coding rate is variable.

[0002]

2. Description of the Related Art Normally, a CD is transmitted between a terminal and a base station.
MA single code transmission or multi-code transmission is performed, and the same data is transmitted through one path. As a prior art, for example, Japanese Patent Application Laid-Open No. 9-321665 discloses a CDMA parallel transmission system.

The above publication discloses that n types of spreading codes are determined according to a quality signal, and an information signal to be transmitted is divided into n pieces, and the divided information signals are multiplied by the above spreading codes. ing. Also in the example of the above publication, the divided information signals are transmitted in parallel by multicode, but the same data is transmitted by one path.

[0004]

However, in the above-mentioned prior art of parallel transmission, there is a problem that when a burst error occurs, a part of information is deteriorated because the same data has one path. Further, when the CDMA coding rate is made variable, puncturing is employed.

However, when the puncturing rate increases, there is a problem in that the quality of the transmission signal deteriorates. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a parallel transmission system and method in CDMA that can prevent quality degradation of a transmission signal due to burst errors and puncturing due to an increase in puncturing. I do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a CDMA parallel transmission system in which data is spread and despread by a spreading code to perform transmission and reception. The transmitting and receiving unit that spreads and transmits the same data with different spreading codes and combines the same data obtained by despreading the received signal with the spreading code, and the line quality when the same data is transmitted and received by the transmitting and receiving unit. Accordingly, the present invention provides a parallel transmission system in CDMA, comprising: a spread code number control unit that performs closed-loop control on the number of spread codes for spreading or despreading the same data distributed to a plurality of pieces.

By this means, by transmitting the same information data through a plurality of paths, a diversity effect can be obtained, and it is possible to prevent the quality of a transmission signal from deteriorating due to a burst error. become. Also,
Since the number of spreading codes for performing parallel transmission can be reduced as the line quality becomes better, the processing amount and power consumption can be reduced.

Preferably, the transmission / reception unit is provided with a rate matching / dematching unit, and the rate matching / dematching unit has a different rate matching pattern for each spreading code. Further, preferably, in the rate matching pattern, different bits are punctured for each spreading code. By this means, the coding rate can be made variable, and the deterioration of the quality of the transmission signal due to the increase in puncturing can be prevented.

Preferably, the transmission / reception section is provided with an interleave / deinterleave section, and the interleave / deinterleave section is provided.
The deinterleave section has a different interleave pattern for each spreading code. Interleaving of this means makes it possible to increase the resistance to burst errors. Preferably, the transmission power per spreading code is 1 / (N + 1) of the transmission power for normal single spreading code transmission with respect to the number N + 1 of spreading codes for spreading or despreading the same data. By this means, the amount of interference becomes equal to that of normal single spreading code transmission.

[0010] Further, in a parallel transmission system in CDMA in which transmission and reception are performed by spreading and despreading data with a spreading code, a distribution processing unit for distributing the same data to be transmitted to a plurality of pieces of data, A plurality of rate matching units that perform different rate matching, a plurality of interleaving units that perform different interleaving on each of the same data that has been rate-matched, and a spreading process using different spreading codes to transmit the same interleaved data. A plurality of spreading processing units to be performed, the number of distributions of the distribution processing unit, the number of spreading codes of the spreading processing unit are determined according to the line quality, and the spreading for transmitting data of the determined number of spreading codes is performed. A code number determining unit, and despreading the received data with the spreading code of the spreading processing unit for each of the same data A despreading processing unit, a plurality of deinterleaving units that deinterleave each of the same data obtained by the despreading process, and a plurality of rate dematching units that perform rate dematching of each of the deinterleaved same data And a combining processing unit that combines the same data subjected to rate dematching, and measures the line quality when receiving the same data, and spreads the measured line quality information to perform the spreading code. A line quality measurement unit for transmission to the number determination unit, and a received signal obtained by despreading,
Parallel transmission in CDMA, comprising: a spread code number determination unit that determines the determined number of spread codes and performs the deinterleaving process and the rate dematching process by the determined number of spread codes. Provide system. By this means, by transmitting the same information data through a plurality of paths, a diversity effect can be obtained, and it is possible to prevent a transmission signal from deteriorating due to a burst error, The better the line quality, the smaller the number of spreading codes required for parallel transmission, so that the amount of processing and power consumption can be reduced, and the quality of transmitted signals can be prevented from deteriorating due to increased puncturing. The interleaving makes it possible to increase the resistance to burst errors.

Further, in a parallel transmission method in CDMA in which transmission and reception are performed by spreading and despreading data with a spreading code, a step of distributing the same data to a plurality of pieces of data, And transmitting, and combining the same data obtained by despreading the received signal with the spreading code, and dividing the received data into a plurality according to the line quality when transmitting and receiving the same data. Controlling the number of spreading codes for spreading or despreading the same data in a closed loop.

By this means, by transmitting the same information data through a plurality of paths, a diversity effect can be obtained, and it is possible to prevent the quality of a transmission signal from deteriorating due to a burst error. Since the number of spreading codes for performing parallel transmission is reduced as the line quality becomes better, the processing amount and power consumption can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a CDM according to the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of a terminal-side transmission / reception unit of the parallel transmission system in A. As shown in the figure, the transmitting unit of the terminal-side transmitting / receiving unit 20 of the terminal that performs transmission and reception with the base station includes a CRC (Cyclic Redundancy Che).
ck) The adding unit 21 is provided, and the CRC adding unit 21
By adding C, information data is encoded.

The output side of the CRC adding section 21 is connected to a channel coding section 22 for channel coding (C
A channel coding unit 22 performs channel coding on the coded information data using a convolutional code, a Turbo code, or the like. Channel coding unit 2
2 is connected to a distribution processing unit 23, which distributes the same channel-coded information data to the number of codes (N + 1) and transmits the same information data through a plurality of paths. By doing so, a diversity effect can be obtained.

On the output side of the distribution processing unit 23, a plurality of Rate Matching units 24-0 are provided.
To 24-N are connected, and the rate matching units 24-0 to 24-N are connected.
24-N inputs the same information data distributed to N pieces by the distribution processing unit 23 and performs rate matching by repetition or puncturing of the input information data sequence, This makes the addition rate variable,
Adjust the number of bits that can be transmitted in the wireless section.

The output side of the rate matching units 24-0 to 24-N is provided with an interleave unit 2
5-0 to 25-N are connected to each other, and the interleaving units 25-0 to 25-N respectively input the information data subjected to the rate matching, and perform interleaving in which bits of the input information data are replaced with different interleave patterns. Improves resistance to burst errors.

The output sides of the interleaving sections 25-1 to 25-N are provided with mapping sections 26-0 to 26-26.
−N are respectively connected, and the mapping units 26-0 to 26
-N inputs the interleaved information data, and converts the input information data into a DPDCH (Dedicated Physical D) in a predetermined format.
(Data Channel) 1 to N physical channels and transmit data DPDCHs 61-0 to 61-N
Is output.

Spreading processing units 27-0 to 27-N are connected to the output sides of the mapping units 26-0 to 26-N, respectively. N respectively, and the transmission data DPDCH6
1-0 to 61-N are respectively input, and the input transmission data DPDCHs 61-0 to 61-N are input with different spreading codes 0.
To N, and transmit.

The transmission power of the terminal side transmitting / receiving section 20 is:
In order to make the amount of interference equal to that of normal single spreading code transmission, the transmission power per spreading code is 1 / (N + 1). The input side of the distribution processing unit 23 is connected to the number-of-spreading-codes determination unit 28, which determines the number of codes (N + 1) and outputs the number of spreading codes (N + 1) to the distribution processing unit 23. .

In order to avoid an increase in the processing amount and power consumption due to the parallel transmission, the processing after the rate matching units 24-0 to 24-N is performed in consideration of the reduction in the processing amount and power consumption. It is performed for the number of spreading codes determined by the determination unit 28. That is, control is performed such that the better the line quality, the smaller the number of spreading codes for performing parallel transmission.

The number of spreading codes (N + 1) is determined by a closed loop (Closed loop) formed between the terminal side transmitting / receiving section 20 and the base station.
Based on the loop quality information received by the base station by the adaptive control of (Loop), it is determined as follows. The output side of the spreading code number determination unit 28 has TFCI (Tran
sport Format Combination
Indicator) multiplexing unit 29 is connected, and TFCI
The multiplexing unit 29 receives the number of spreading codes (N + 1) from the number-of-spreading-codes determining unit 28, and inputs the number of spreading codes (N +
1) to DPCCH (Dedicated Physica)
1 Control Channel) and multiplexes the information.

A spreading processor 30 is connected to the TFCI multiplexing unit 29. The spreading processor 30 spreads the transmission data DPCCH 62 input from the TFCI multiplexing unit 29 and transmits the data. Further, a despreading processing unit 31 is provided in the terminal side transmitting / receiving unit 20.
Is provided, and the despreading processing unit 31 performs despreading processing on a signal received from the base station, and outputs received data DPCCH 63.

The output side of the despreading processing unit 31 is connected to a line quality information extracting unit 32, and the line quality information extracting unit 32 receives the received data DPCCH 63 from the despreading processing unit 31.
, And outputs the line quality information to the spreading code number determination unit 28. FIG. 2 is a block diagram showing a schematic configuration of a base station side transmitting / receiving section of the parallel transmission system in CDMA according to the present invention.

As shown in the figure, a despreading processing unit 48 is provided in the receiving unit of the base station side transmitting / receiving unit 40 of the base station that performs transmission / reception with the terminal. Transmission data DP from the diffusion processing unit 30 of the transmission unit 20
CCH 62 is despread, and received data DPCCH 6
5 is output. The output side of the despreading processing unit 48 has TFCI
An extraction unit 49 is connected, and the TFCI extraction unit 49 receives the received data DPCCH 65 from the despread processing unit 48,
The information of the TFCI section of the CCH is decoded and output.

The output side of the TFCI extraction section 49 is connected to an extraction and spread code number determination section 50, which outputs the DPCCH decoded from the TFCI extraction section 49.
Is input, and the number of spreading codes (N + 1) used for the frame is determined. To avoid an increase in processing amount and power consumption due to parallel transmission,
In consideration of the reduction of the processing amount and the reduction of the power consumption, the processes after the despreading processing units 41-0 to 41-N described later are performed by the number of spreading codes determined by the spreading code number determination unit 50.

That is, control is performed such that the better the channel quality, the smaller the number of spreading codes for performing parallel transmission. Further, a line quality measuring unit 51 is connected to an output side of the despreading processing unit 48. The line quality measuring unit 51 receives the received data DPCCH 65, measures a received SIR from a pilot (Pilot) unit of the received data DPCCH 65,
Obtain line quality information indicating the line quality.

A line quality information multiplexing unit 52 is connected to the output side of the line quality measuring unit 51. The line quality information multiplexing unit 52 inputs the line quality information from the line quality
H and multiplexed with H to output transmission data DPCCH 66. A spread processing unit 53 is connected to the line quality information multiplexing unit 52,
Spreading processing section 53 receives transmission data DPCCH 66 from channel quality information multiplexing section 52, spreads the transmission data DPCCH 66, and transmits the data.
It is received as CH63.

Further, the receiving section of the base station side transmitting / receiving section 40 is provided with a plurality of despreading processing sections 41-0 to 41-N.
The despreading processing units 41-0 to 41-N are connected to the spreading processing unit 27-0.
The transmission data DPDCHs 61-0 to 61-N are received as information data transmitted from.
-0-64-N is output.

On the output side of the despreading processing units 41-0 to 41-N, demapping units (Demapping) 42-0 to 41-N are provided.
42-N are connected to each other, and a demapping unit 42-0 is connected.
.About.42-N are received data DPDCHs 64-0 to 64-N
And demapping is performed. The output side of the demapping units 42-0 to 42-N has a deinterleave (D
einterleave) units 43-0 to 43-N are connected to each other, and the deinterleave units 43-0 to 43-N are different for each spreading code for data input from the demapping units 42-0 to 42-N. Den-interleave with the de-interleave pattern.

That is, the interleaving units 25-0 to 25
−N is used as the deinterleave pattern. On the output side of the deinterleaving units 43-0 to 43-N, rate dematching (Rate Dematching) units 44-0 to 44-4
4-N, respectively, and a rate dematching unit 44
-0 to 44-N are deinterleaving units 43-0 to 43-N
, Rate dematching is performed using different rate dematch patterns for each spreading code.

The rate dematching units 44-0 to 44-N
Is connected to a soft-decision synthesis processing section 45, and the soft-decision synthesis processing section 45 includes rate dematching sections 44-0 to 44-44.
-N, and soft-decision-combines the data decoded with the respective spreading codes based on the number of spreading codes determined by the number-of-spreading-codes determining unit 50, and combines the same information data distributed and transmitted. I do.

A channel decoding (Channel Decoding) section 46 is connected to the soft decision synthesis processing section 45, and the channel decoding section 46 is connected to the soft decision synthesis processing section 45.
From the data, convolutional decoding or turbo (Tu
rbo) Perform channel decoding processing by decoding. A CRC check unit 47 is connected to the channel decoding unit 46, and the CRC check unit 47 receives data from the channel decoding unit 46 and performs a CRC check.

FIG. 3 is a diagram for explaining the determination of the number of spreading codes by the number-of-spreading-codes determining section 28 of the terminal-side transmitting / receiving section 20 in FIG. As shown in FIG.
The 0 spreading code number determination unit 28 holds data on the relationship between the channel quality deterioration and the spreading code number N + 1. The number-of-spreading-codes deciding unit 28 decides the number of spreading codes based on the held relation data, using the channel quality transmitted from the base station-side transmitting / receiving unit 40 as a parameter.

In this way, the number of paths for transmitting the same data in parallel is determined or determined according to the line quality. As described above, the number of rate matching and the number of interleaving are set to be the same as the determined number of spreading codes, and the determined number of spreading codes is transmitted to the base station side transmitting / receiving section 40.

FIG. 4 shows the rate matching of the terminal side transmitting / receiving section 20 in FIG. 1 and the base station side transmitting / receiving section 40 in FIG.
FIG. 4 is a diagram for explaining rate dematching of FIG. As shown in the figure, a variable coding rate can be realized by the rate matching of the terminal side transmitting / receiving unit 20 and the rate dematching of the base station side transmitting / receiving unit 40. As shown in FIG. 2A, as an example, when the number of spreading codes is determined to be N + 1 = 2, the same data is distributed to the rate matching units 24-0 to 24-1 in the terminal-side transmitting / receiving unit 20. Is done.
Repetition from 6 bits to 8 bits (Repet
At the time of the (ion), the bits “1” and “3” are repeated with respect to the input data sequence of the rate matching unit 24-0 as in the output data sequence of the rate matching unit 24-0.

On the other hand, in the rate dematching section 44-0 of the base station side transmitting / receiving section 40, the bits "1" and "3" repetition by the rate matching section 24-0.
Is removed. Bits “2” and “4” are repeated with respect to the input data sequence of the rate matching unit 24-1 like the output data sequence of the rate matching unit 24-1.

On the other hand, the rate dematching section 44
In the case of −0, the bits “2” and “4” repetition by the rate matching unit 24-0 are removed. As shown in FIG. 3B, at the time of puncturing from 10 bits to 8 bits, the input data sequence of the rate matching unit 24-0 is changed to the output data sequence of the rate matching unit 24-0. Then, bits "1" and "5" are punctured.

On the other hand, the rate dematching section 44
At −0, bits “1” and “5” punctured by the rate matching unit 24-0 are inserted, but are undefined (indicated by D). Rate matching unit 24
-1 for the input data string,
Bits “2” and “6” are punctured like an output data string of −1.

On the other hand, the rate dematching section 44
At -1, the bits "2" and "6" punctured by the rate matching unit 24-1 are inserted, but are undefined (indicated by D). As shown in FIG. 9C, after the output data strings of the rate dematching units 44-0 to 44-1 are soft-decision-synthesized, the indefinite bits disappear.

Since a rate matching pattern in which different bits are punctured for each spreading code is used, as described above, the rate dematching section 44-
Even if there are indefinite bits in the output data strings 0 to 44-1, there are no indefinite bits after soft decision synthesis. FIG. 5 is a diagram for explaining the interleaving of the terminal-side transmitting / receiving section 20 in FIG. 1 and the deinterleaving of the base station-side transmitting / receiving section 40 in FIG.

As described above, as an example, when the number of spreading codes is determined to be N + 1 = 2, as shown in FIG.
0, the output data string of the interleave unit 25-0 is (0426153).
Interleaving is performed in an interleave pattern as shown in 7).

As shown in FIG. 4B, the input data sequence (012) of the interleave unit 25-1 of the terminal side transmitting / receiving unit 20
34567) is interleaved with an interleave pattern such that the output data sequence of the interleave unit 25-1 becomes (73516240). in this way,
In the interleaving units 25-0 to 25-1, interleaving is performed using different interleaving patterns.

As shown in FIGS. 7A and 7B, the deinterleaving sections 43-0 to 43-1 of the base station side transmitting / receiving section 40 are used.
Now, the interleave patterns (0426137) used in the interleave units 25-0 and 25-1, respectively,
At (73516240), deinterleaving is performed. FIG. 6 is a diagram illustrating a configuration example of a wireless frame transmitted and received between the terminal-side transmitting / receiving unit 20 and the base station-side transmitting / receiving unit 40.

As shown in the figure, the radio frame is a superframe having a period Tsuper = 2560 ms, and is composed of frames # 0 to # 255 each having a period Tf = 10 ms. Furthermore, each frame has slots # 0 to Ts = 0.666sm, respectively.
It consists of slot # 14.

Each slot is composed of DPDCH # 0-DPDC
H # N and DPCCH. Each DPDCH is Nda
It consists of ta bits of data and is used for transmitting and receiving the same distributed data. DPCCH is P of Npilot bits
It is composed of ilot and TFCI of NTFCI bits, and is used for transmitting and receiving information on the determined number of spreading codes and channel quality. In the above description, the terminal is the transmitting side and the base station is the receiving side. Conversely, the terminal may be the receiving side and the base station may be the transmitting side.

[0046]

As described above, according to the present invention,
The same data was distributed to a plurality of parts, each distributed identical data was spread and transmitted with a different spreading code, and the same data obtained by despreading the received signal with a spreading code was synthesized, and the same data was transmitted and received. Depending on the line quality at the time, the number of spreading codes for spreading or despreading the same data distributed to a plurality is controlled in a closed loop, so that the same information data is transmitted over a plurality of paths, thereby achieving diversity. The effect can be obtained, and it is possible to prevent the transmission signal from deteriorating due to the burst error,
As the line quality is better, the number of spreading codes for performing parallel transmission is reduced, so that the processing amount and power consumption can be reduced.

Further, different rate matching patterns are processed for each spreading code, and puncturing is performed with different bits for each spreading code. Therefore, the coding rate can be made variable, resulting in an increase in puncturing. Quality of the transmitted signal to be transmitted can be prevented. Furthermore, since different interleaving is performed for each spreading code, it becomes possible to increase the resistance to burst errors by interleaving.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a terminal-side transmitting / receiving section of a parallel transmission system in CDMA according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a base station side transmitting / receiving section of the parallel transmission system in CDMA according to the present invention.

FIG. 3 is a diagram illustrating determination of the number of spread codes by a spread code number determination unit 28 of the terminal-side transmission / reception unit 20 in FIG. 1;

4 is a diagram illustrating rate matching of a terminal-side transmitting / receiving section 20 in FIG. 1 and rate dematching of a base station-side transmitting / receiving section 40 in FIG. 2;

5 is a diagram illustrating interleaving of a terminal-side transmitting / receiving unit 20 in FIG. 1 and deinterleaving of a base station-side transmitting / receiving unit 40 in FIG. 2;

FIG. 6 is a diagram illustrating a configuration example of a radio frame transmitted and received between a terminal-side transmitting / receiving section 20 and a base station-side transmitting / receiving section 40.

[Explanation of symbols]

 Reference Signs List 20: terminal side transmitting / receiving section 21: CRC adding section 22: channel encoding section 23: distribution processing section 24-0 to 24-N ... rate matching section 25-0 to 25-N ... interleaving section 26-0 to 26-N ... Mapping units 27-0 to 27-N, 30, 53 ... Spreading processing unit 28 ... Spreading code number determining unit 29 ... TFCI multiplexing unit 32 ... Line quality information extracting unit 40 ... Base station side transmitting / receiving units 31, 41-0 41-N, 48: despreading processing unit 42-0 to 42-N: demapping unit 43-0 to 43-N: deinterleaving unit 44-0 to 44-N: rate dematching unit 45: soft decision synthesis process Unit 46 channel decoding unit 47 CRC check unit 49 TFCI extraction unit 50 spreading code number determination unit 51 channel quality measurement unit 52 channel quality information multiplexing unit 61-0 to 61-N transmission data Data DPDCH 62,66 ... transmit data DPCCH 63,65 ... receiving data DPCCH 64-0~64-N ... receiving data DPDCH

Claims (7)

[Claims] 1. A parallel transmission system in CDMA in which transmission and reception are performed by spreading and despreading data with a spreading code, wherein the same data distributed to a plurality is spread and transmitted with different spreading codes, and a received signal is spread by the spreading code. A transmission / reception unit that combines the same data obtained by despreading in accordance with a line quality when the transmission / reception unit transmits / receives the same data. CDMA characterized by comprising a spreading code number control unit for performing closed loop control of the number of spreading codes to be spread.
Parallel transmission system. 2. The transmission / reception unit according to claim 1, wherein a rate matching / dematching unit is provided, and the rate matching / dematching unit has a different rate matching pattern for each spreading code. C
Parallel transmission system in DMA. 3. The parallel transmission system according to claim 2, wherein different bits are punctured for each spreading code in the rate matching pattern. 4. The CDMA parallel communication system according to claim 1, wherein the transmission / reception unit is provided with an interleave / deinterleave unit, and the interleave / deinterleave unit has a different interleave pattern for each spreading code. Transmission system. 5. The transmission power per one spreading code is 1 / (N + 1) of the transmission power for normal single spreading code transmission for the number N + 1 of spreading codes for spreading or despreading the same data. The parallel transmission system in CDMA according to claim 1, wherein: 6. In a parallel transmission system in CDMA in which transmission and reception are performed by spreading and despreading data with a spreading code, a distribution processing unit for distributing the same data to be transmitted to a plurality of pieces of data, A plurality of rate matching units for performing different rate matching; a plurality of interleaving units for performing different interleaving on each of the same data subjected to rate matching; and performing a spreading process with a different spreading code to transmit each of the interleaved same data. A plurality of spreading processing units to perform, the number of distributions of the distribution processing unit, the number of spreading codes of the spreading processing unit are determined according to the line quality, and the spreading for transmitting data of the determined number of spreading codes is performed. A code number determining unit, and despreading the received signal to the same data with the spreading code of the spreading processing unit A despreading processing unit, a plurality of deinterleaving units that deinterleave each of the same data obtained by the despreading process, and a plurality of rate dematching units that perform rate dematching of each of the deinterleaved same data. A combining processing unit for combining the same data subjected to the rate dematching, and measuring a line quality when each of the same data is received,
A line quality measuring unit for spreading the measured line quality information and transmitting the information to the spreading code number determining unit; anddetermining and determining the determined number of spreading codes obtained by despreading a received signal. C. a spreading code number determining unit for performing the deinterleaving process and the rate dematching process by the number of the spreading codes.
Parallel transmission system in DMA. 7. A parallel transmission method in CDMA in which transmission and reception are performed by spreading and despreading data by spreading and despreading data, wherein a step of distributing the same data to a plurality of pieces of data, and spreading each of the distributed same data with a different spreading code. Transmitting the same data, decompressing the received signal with the spreading code, and combining the same data, and according to the line quality when transmitting and receiving the same data,
Performing a closed loop control of the number of spreading codes for spreading or despreading the same data distributed to a plurality of pieces of the same data.