JP2001345716A - Coding communication system and method of reducing transmission errors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the decode error rate by randomizing consecutive signal errors generated during transmission. SOLUTION: A coding circuit 100 encodes an input signal into coded signal series C1(t), C2(t) using a convolutional code of the coding rate 1/2. The coded signal series C1(t), C2(t) are rearranged by respective interleavers 102, 104 into different orders by different scrambling methods and then are outputted. The outputted signals are modulated by a modulator 106 to be transmitted onto a transmission line 30. A receiver 20 demodulates the signals received from the transmission line 30 and then supplies the demodulated signals to deiriterleavers 202, 204. The deinterleavers 202, 204 rearrange the demodulated signal series D1'(t), D2'(t) into signal series C1'(t), C2'(t) having the original arrangement orders by different inverse scrambling methods, Even if the signal series D1'(t), D2'(t) have consecutive errors at the same locations, the locations of errors are distributed into different ones and thereby being randomized in the signal series D1'(t), D2'(t), Consequently, the signal series C1'(t), C2'(t) including the randomized locations of errors are effectively corrected for errors by a decoding circuit 206 and the demodulation bits are regenerated with validity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coded communication system and a transmission error reduction method, and more particularly to a coded communication system and a transmission system suitable for use in a radio system including a radio transmission path such as mobile communication. The present invention relates to an error reduction method.

[0002]

2. Description of the Related Art In recent years, in mobile communications such as automobile telephones and mobile telephones, digital radio transmission systems for encoding voice information into digital signals and transmitting the signals have become widespread. For example, one such transmission system is "Digital Communications" by John G. Proakis.
A signal transmission system and the like described in McGraw-Hill, pp. 440 to 441 (1989) are known.

In the signal transmission system of this document, for example, an input signal is encoded by a random error correction encoder represented by a convolutional encoder. In this case, when the random error correction code is, for example, a convolutional encoder having a coding rate of 1/2, the encoder outputs two encoded signal sequences X1 (t) and X2 (t). Two encoded signal sequences
X1 (t) and X2 (t) are interleaved by two interleavers having the same operation, and output as signal sequences Y1 (t) and Y2 (t).

[0004] The interlaced signal sequence is modulated by an information modulator to become a signal T (t) and transmitted via a radio transmission path or the like. The signal T '(t) received on the receiving side is demodulated as signals Y'1 (t) and Y'2 (t) by the information demodulator. The signals T ′ (t), Y′1 (t), and Y′2 (t) include noise on the transmission path. The demodulated signals Y'1 (t) and Y'2 (t) are de-interlaced by two deinterleavers operating in the same manner, and the original sequence of encoded signal sequences X'1 (t) and X2 ' Output as (t). These encoded signal sequences X′1 (t) and X′2 (t) are decoded by a decoder such as a Viterbi decoder. As a result, error correction of a signal due to transmission path noise is performed, and the original information is reproduced based on the decoded bits.

[0005] In such a signal transmission system, it is possible to increase the correction capability even for continuous errors occurring during transmission by using a crossover method based on random error correction codes and interleaving.

For details, see, for example, Mitsuo Yokoyama, "Mobile Communication Network", published by Shokodo, pp. 53-55 (1993).
The interleaver and the deinterleaver are effectively used to randomize a continuous error such as a burst error occurring during signal transmission, as disclosed in US Pat.

The interleaver and the deinterleaver each have a memory arranged two-dimensionally, for example, in m rows and n columns. The interleaver interleaving the signals, for example, stores input signals in the column direction from the upper left to the lower right of the memory, reads out the signals stored in the memory in the row direction from the upper left to the lower right, and arranges the signals. Replace. A deinterleaver that reverses signals performs an operation reverse to that of the interleaver, stores an input signal in a row direction, and outputs an input signal in a column direction.

[0008] With this, continuous errors generated during transmission are dispersed, and for example, when a burst error of length nxk occurs in the input signal to the deinterleaver, the burst error of the output signal from the deinterleaver is reduced. The length is output as k or less. As a result, the error portion of the dispersed signal is corrected by the error correction code, and the original coded information is reproduced.

[0009]

However, in the prior art described above, since a plurality of interleavers and deinterleavers in a signal transmission system all cross and deinterlace a plurality of coded signal sequences in the same manner, If the coded signal sequence is erroneous in the transmission process, a plurality of coded signal sequences X′1 (1), X′2 (t) that are reverse-crossed
There is a problem that the probability that the signals at the same location in the same location are erroneous at the same time increases, and the error rate of the decoded signal is not improved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coding communication system which can solve the above-mentioned drawbacks of the prior art, effectively randomize transmission errors and improve a decoding error rate, and a transmission error reduction method thereof. And

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a coding communication system according to the present invention is a coding communication system for coding and transmitting information. Encoding means for encoding a plurality of encoded signal sequences in a system, a plurality of interleavers for rearranging and outputting signals for each encoded signal sequence encoded by the encoding means, and a signal from the interleaver. A transmitting device including a modulating means for modulating by a predetermined modulating method; a demodulating means for demodulating a signal received from the transmitting device via a predetermined transmission path by a predetermined demodulating method; and a code demodulated by the demodulating means. And a plurality of deinterleavers for obtaining the original coded signal sequence by rearranging the coded signal in the original order in the reverse order to the interleaver, and decoding the coded signal sequence from the deinterleaver. And a decoding device for reproducing the original information, and interleaver and deinterleaver use different interlacing methods for each encoded signal sequence to randomize transmission errors between signals. It is characterized by the following.

In this case, the encoding means encodes the information with an error correction code including a convolutional code having an encoding rate of m / n,
It is preferable that at least n interleavers and deinterleavers are provided, respectively, so that the interlacing method differs for each coded signal sequence.

The interleaver and the deinterleaver each include a two-dimensional array memory, and by changing the writing position or the reading order of the coded signal in each two-dimensional array memory, the interleaving method for each coded sequence signal is performed. Is advantageously included.

On the other hand, a transmitting apparatus according to the present invention is a transmitting apparatus in an encoding communication system for encoding information and transmitting the encoded information to a predetermined transmission path. Coding means for coding into a coded signal sequence, a plurality of interleavers for rearranging and outputting signals for each coded signal sequence coded by the coding means, and a signal from the interleaver in a predetermined modulation scheme. And a modulating means for modulating, wherein the interleaver is characterized in that the order of rearrangement of signals for each coded signal sequence is different.

In this case, the coding means codes the information with an error correction code including a convolutional code having a coding rate of m / n,
At least n interleavers are prepared, and the order of rearranging the signals for each coded signal sequence may be different.

Each of the interleavers includes a two-dimensional array memory. The interleaver replaces the order of the write position or the read order of the signal for each coded signal sequence in each of the two-dimensional array memories, and It is advantageous to include memory control means for changing the order of rearranging the signals.

In this case, the memory control means changes the order of writing positions of the signals for each encoded signal sequence to the respective two-dimensional array memories so that the signals of the encoded signal sequences for each interleaver are different. It is good to make the sort order different.

In the memory control means, the order of reading out the signals for each coded signal sequence from each two-dimensional array memory is made different to rearrange the signals for each coded signal sequence in each interleaver. The order may be different.

Further, both the order of the writing position of the signal for each encoded signal sequence and the order of reading the signal for each encoded signal sequence in each two-dimensional array memory are made different by the memory control means. The order of rearranging signals for each coded signal sequence in the interleaver may be different.

On the other hand, a receiving apparatus according to the present invention is a receiving apparatus in an encoding communication system for receiving a signal transmitted from the transmitting apparatus via a predetermined transmission path, and demodulates the received signal by a predetermined demodulating method. Demodulating means, a plurality of deinterleavers for rearranging the signal demodulated by the demodulating means in a predetermined order and returning to the original coded signal sequence, and decoding and decoding the coded signal sequence rearranged by the deinterleaver. Decoding means for reproducing the information of the transmission device, the deinterleaver includes a two-dimensional array memory and a memory control means capable of changing the order of rearrangement according to the rearrangement order of the interleaver of the transmission device, I do.

In this case, it is preferable that the memory control means change the order of writing the signals to the respective two-dimensional array memories and return the read signals to the coded signal sequence in the original order.

Also, the memory control means changes the order of reading signals from the respective two-dimensional array memories,
The signal may be returned to the signal of each encoded signal sequence in the original order.

Further, the memory control means changes the order of the writing position of the signal to each two-dimensional array memory and the order of reading the stored signal so as to restore the signal for each coded signal sequence in the original order. You may.

Further, the transmission error reducing method according to the present invention comprises:
When transmitting information through a predetermined transmission path, in a transmission error reduction method for randomizing a continuous error of a signal generated at the time of transmission and reducing the transmission error, a code including an error correction code is used to input information. A first step of encoding into a plurality of encoded signal sequences by the encoding method, and arranging signals for each of the encoded signal sequences encoded in the first step by using different interlacing methods for each signal sequence. A second step of changing, a third step of modulating the coded signal from the second step by a predetermined modulation method and transmitting the signal, and a step of transmitting the signal transmitted in the third step to a predetermined transmission path. And a fifth step of demodulating the signal received in the fourth step by a predetermined demodulation method.
A step of returning the signals demodulated in the fifth step to the original order by rearranging the signals demodulated in the fifth step in the reverse order of the second step; and a fifth step. A sixth step of decoding the coded signal sequence rearranged in the original order and reproducing the original information.

The first step includes a step of encoding information with an error correction code including a convolutional code having a coding rate of m / n. The second step and the fifth step include the steps of: n
It is advantageous to change the crossover method for each of the coded signal sequences.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a coded communication system according to the present invention; FIG. 1 shows an embodiment of an encoding communication system to which a transmission error reducing method according to the present invention is applied. The coding communication system according to the present embodiment is capable of generating a continuous error such as a burst error occurring in a transmission path by a combination of coding of information by an error correction code and crossing of a coded signal sequence by an interleaving technique, that is, rearrangement. It is a signal transmission system to reduce.

In particular, in the present embodiment, a plurality of coded signal sequences are formed by convolutional codes, and a plurality of interleavers and deinterleavers for rearranging the coded signal sequences are used in combination to make the respective signals different in crossing and de-crossing methods. The main feature is that errors are randomized. In the following, the present embodiment will be described by taking, as an example, encoding using a convolutional code with an encoding rate of 1/2 as an error correction code.

More specifically, the coding communication system according to the present embodiment includes, as shown in FIG. 1, a coding circuit 100, two interleavers 102 and 104, a modulation circuit 106, and a control circuit 10.
8, a demodulation circuit 200, two deinterleavers 202 and 204, a decoding circuit 206, and a control device 208.
And a receiving device 20 including: Reference numeral 30 denotes a transmission path such as a wireless transmission path that applies noise such as a burst error due to fading to a propagation signal.

The encoding circuit 100 is, for example, a transmission line encoder for sequentially inputting audio data and the like digitized by an audio encoder and the like and performing error correction encoding on the input audio data.
In this embodiment, for example, each bit is 2 bits 1
It includes a convolutional encoder with a coding rate of 1/2, which is assembled into the coded signal sequences C1 (t) and C2 (t) of the symbols. In addition, CRC (Cyclic redundancy check) is added to the convolutionally encoded signal.
k) A parity bit such as a code may be added. The encoded encoded signal sequences C1 (t) and C2 (t) are supplied to interleavers 102 and 104, respectively.

The interleavers 102, 104
Are multiplexed signal sequences C1 (t) and C2 (t), respectively, which are rearranged and output. For example, under the control of the control circuit 108, data is written and read out in m rows and n columns. And a two-dimensional array memory. In particular, in the present embodiment, the first interleaver 102 and the second interleaver 104
Performs sorting of C1 (t) and C2 (t).

For example, first interleaver 102 receives encoded signal sequence C1 (t) and writes each bit in the column direction from the upper left to the lower right of the two-dimensional array memory as shown in FIG. , The stored bits are read out from the lower right to the upper left in the row direction, and the rearranged encoded signal sequence D1 is read.
(t) is output to the modulation circuit 106.

The second interleaver 104 receives the coded signal sequence C2 (t) and, for example, writes each bit in the column direction from the upper left to the lower right of the two-dimensional array memory as shown in FIG. , The stored bits are read out from the upper left to the lower right in the row direction, and the rearranged encoded signal sequence D2 is read.
(t) is output to the modulation circuit 106.

The modulation circuit 106 is a modulator for modulating the signal sequences D1 (t) and D2 (t) received from the interleavers 102 and 104 by a predetermined modulation method.
A quadrature modulator that modulates D (1) and D2 (t) by phase division is effectively applied. The modulated signal R (t) is transmitted from the front end of the transmitter to the transmission path 30 via the antenna.

The control circuit 108 is a control circuit for controlling the above-described units. For example, the control circuit 108 controls the timing of signals from the respective circuits, and controls the writing and reading of signals to and from the two-dimensional array memories of the interleavers 102 and 104, respectively. The power control and the like of the transmission signal R (t) from the modulation circuit 106 are respectively performed. In particular, in the present embodiment, as described above, writing and reading of the coded signal sequences C1 (t) and C2 (t) of the two-dimensional array memory in the interleavers 102 and 104 are executed by different interlacing methods, and the interleavers 102 and 104 It includes an interleave control circuit for performing different rearrangements of the signal sequences C1 (t) and C2 (t). Advantageously, the interleaving method of each interleaver 102, 104 may be changed according to the state of the transmission path 30.

On the other hand, in the receiver 20 according to the present embodiment,
The demodulation circuit 200 outputs the signal R ′ (t) propagated through the transmission path 30.
A demodulator that receives and demodulates it, for example, demodulates a baseband signal from a high-frequency signal that has undergone phase modulation, and returns the original digital signal sequence D′ 1 (t), D′ 2 (t) Are respectively detected. The demodulated signal sequences D'1 (t) and D'2 (t) are supplied to deinterleavers 202 and 204, respectively.

The deinterleavers 202 and 204 form the coded signal sequences C′1 (t) and C′2 (t) in the original order when coded by reverse permutation with the interleavers 102 and 104 of the transmitter 10, respectively. And a two-dimensional array memory having m rows and n columns as in the case of the interleavers 102 and 104. In these two-dimensional array memories, data writing and reading are executed under the control of the control circuit 208, respectively.

For example, in the present embodiment, the first deinterleaver 202 converts the signal sequence D'1 (t) from the demodulation circuit 200 to the lower right of the two-dimensional array memory for each bit as shown in FIG. From the upper left to the upper left, and the stored signal is read out from the upper left to the lower right in the column direction for each bit. Similarly, in the second deinterleaver 204, the modulation circuit
As shown in FIG. 5, the signal sequence D'2 (t) from the memory 200 is written in the row direction from the upper left to the lower right of the two-dimensional array memory for each bit, and the stored signal is written in the upper left for each bit. And read out in the column direction from the bottom right. The de-interlaced encoded signal sequences C′1 (t) and C′2 (t) are supplied to a decoding circuit 206.

The decoding circuit 206 includes deinterleavers 202 and 204
Is a decoder that receives the reverse-interlaced coded signal sequence C′1 (t), C′2 (t) from, and decodes the original data before performing convolutional coding.In the present embodiment, for example, A Viterbi decoder that decodes a trellis code such as a convolutional code using a Viterbi algorithm is effectively applied. The decoded data is further subjected to error correction by parity check or the like, and is decoded by, for example, an audio decoder or the like, and is output as original analog audio information.

The control circuit 208 is a control circuit for controlling each section of the receiver 20. For example, the control circuit 208 controls the timing of signals from the respective circuits, and writes and writes signals in the two-dimensional array memories of the deinterleavers 202 and 204. Read control and the received signal R '(t) received by the demodulation circuit 200
, Respectively. In particular, in the present embodiment, as described above, the writing and reading of the coded signal sequences C′1 (t) and C′2 (t) of the two-dimensional array memory by the interleavers 202 and 204 are performed by different reverse crossing methods. And an interleaver control circuit for causing the interleavers 202 and 204 to execute different rearrangement of the signal sequence. Advantageously, the transmitter 10
In response to the control of the control circuit 108, the deinterleaving method of each deinterleave may be controlled to be variable. In this case, the control signal from the transmitter 10 may include information on each interleave.

The operation of the coding communication system according to this embodiment will be described together with the transmission error reducing method according to the present invention. First, a signal converted into digital data by a speech encoder or the like is encoded. When sequentially supplied to the circuit 100, the encoding circuit 100 sequentially encodes the input data with an error correction code including a convolutional code. In this case, for example, the input data is assembled into a 2-bit symbol for each bit by a coding rate 1/2 encoder and output. Thus, the encoded signal sequence C1 (t) is sequentially output from the encoding circuit 100 to the first interleaver 102, and the encoded signal sequence C2 (t) is sequentially output to the second interleaver 104.

Next, the first received coded signal sequence C1 (t)
The interleaver 102 sequentially writes each bit of the coded signal sequence C1 (1) in the column direction from the upper left to the lower right of the two-dimensional array memory as shown in FIG. 2, for example. Similarly, the second interleaver 104 receiving the coded signal sequence C2 (t) converts each bit of the coded signal sequence C2 (t) from the upper left to the lower right of the two-dimensional array memory as shown in FIG. Are sequentially written in the column direction.

Next, when the coded signal sequence C1 (t) is written into the two-dimensional array memory, the first interleaver 102 stores the stored signal sequence C1 (t) into the right-hand side of the two-dimensional array memory for each bit. A signal sequence D1 (t) that is sequentially read from the bottom to the upper left in the column direction and the encoded signal sequence C1 (t) is rearranged.
To the modulation circuit 106. On the other hand, when the coded signal sequence C2 (t) is written to the two-dimensional array memory of the second interleaver 104, the second interleaver 104 stores the stored signal sequence C2 (t) for each bit from the upper left to the right of the memory. Reading in the column direction sequentially downward, the encoded signal sequence C2 (t)
Is supplied to the modulation circuit 106 as a coded signal sequence D2 (t) by rearrangement different from that of the first interleaver.

Next, the coded signal sequences interleaved with each other
Upon receiving D1 (t) and D2 (t), the modulation circuit 106
The transmission signal R (t) is generated by modulating 1 (t) and D2 (t) by a predetermined modulation method, for example, by phase modulation. The transmission signal R (t) is transmitted from the front end via the antenna to the transmission path.
Sent to 30.

The signal R (t) transmitted via the transmission path 30 is
When the signal R ′ propagates through the transmission line 30, continuous noise such as a burst error occurs due to continuous noise such as fading.
The signal (t) arrives at the receiver 20. Then the signal
The receiver 20 that has received R '(t) demodulates the signal R' (t) in its demodulation circuit 200 and converts the baseband signal into an original digital signal sequence D1 '(t), D2' ( Play t). Thereby, the demodulated signal sequence D1 '(t) is supplied to the first deinterleaver 202, and the signal sequence D2' (t) is sequentially supplied to the third deinterleaver 204. At this time, if there is a burst error, a continuous error occurs in the same place in each of the signal sequences D1 '(t) and D2' (t).

Next, as shown in FIG. 3, the first deinterleaver 202 that has received the signal sequence D1 '(t), opposite to the interleaver 102 of the transmitter 10, has a lower right , Each bit of the signal sequence D1 ′ (t) is written and stored sequentially from the top left. On the other hand, when the second deinterleaver 204 receives the signal sequence D2 '(t), each bit of the signal sequence D2' (t) is stored in the two-dimensional array memory, as shown in FIG. Are sequentially written and stored in the column direction from upper left to lower right.

Next, the first deinterleaver 202, which once stores the signal sequence D1 '(t) in the two-dimensional array memory, reads out the stored signal sequentially from the upper left to the lower right of the two-dimensional memory in the column direction. . As a result, the signal sequence D1 '(t) is reverse-cross-linked as a signal sequence C1' (t) having the same arrangement as the encoded signal sequence C1 (t) after the original convolutional coding.

Similarly, the second deinterleaver 204 storing the signal sequence D2 '(t) in the two-dimensional array memory sequentially stores the two-dimensional array memory from upper left to lower right as shown in FIG. Read in the column direction. Thereby, the signal sequence D2 '(t)
Are inversely cross-linked as a signal sequence C2 ′ (t) having the same arrangement as the encoded signal sequence C2 (t) after the original convolutional coding.

As a result, in the signal sequences C1 '(t) and C2' (t) reversely interlaced from different arrangements, the continuous errors caused by the burst errors are distributed to different positions, and the decoding circuit
Supplied to 206. Next, the decoding circuit 206 having received the signal sequences C1 ′ (t) and C2 ′ (t) performs trellis tracking on each symbol represented by the signal sequences C1 ′ (t) and C2 ′ (t). To obtain the decoded bits. Thereafter, the decoded signals are sequentially reproduced by an audio decoder or the like and output as original analog information.

As described above, according to the coded communication system and the transmission error reducing method according to the present embodiment, each signal coded into two signal sequences C1 (t) and C2 (t) by the convolutional code is used. Since the two interleavers 102 and 104 intersect and transmit the signals in different rearrangements, even if a continuous error such as a burst error occurs in the received signal at the receiver 20 receiving the signals, the deinterleavers 202 and 204 reverse the error. In the coded signal sequences C1 '(t) and C2' (t) after the interlacing, respective continuous errors are distributed to different positions and randomized. As a result, the decoding circuit 206 can effectively correct the distributed error.

In the above embodiment, the interleavers 102, 10
In 4, the position of writing signals to the two-dimensional array memory is set to the same position and the order of reading signals is changed to change the crossing method. However, the present invention is not limited to this. By changing the writing position of the signal to the memory and making the reading order the same, the intersecting method may be made different. Further, both the writing position and the reading order to the two-dimensional array memory may be changed.

In the above embodiment, the deinterleaver 202,
In 204, the write order similar to the read order of the interleavers 102, 104 and the read order similar to the write order of the interleavers 102, 104 are reversely interlaced, but the present invention is not limited to this. Similarly, when the signals are read out in the row direction and interleaved, the received signal sequence may be sequentially written in the column direction by the deinterleaver, read out in the row direction, and reversely interlaced. That is, in the above embodiment, the deinterleaver 202, 20
In FIG. 4, the reverse interleaving is performed in a process completely opposite to that of the interleavers 102 and 104.However, in the present invention, the signal writing order and the signal Alternatively, the reading order may be changed.

Further, in the above embodiment, the interleaver 102
The interleaving method of the interleaver 104 is fixed to the method shown in FIG. 4 so that the respective interlacing methods are made different from each other, but in the present invention, for example, according to the state of the transmission path, Alternatively, the respective interlacing methods may be changed under the control of the control circuit. In this case, some of these interleaving patterns may be prepared, transmitted to the receiver side by a control signal or the like, and the deinterleaver may change the deinterlacing method according to the interleaver.

Further, in the above-described embodiment, a case has been described as an example in which a signal is encoded by a convolutional code having an encoding rate of 1/2. However, in the present invention, in any case, regardless of the encoding rate, a signal is encoded. Can be applied. In this case, for example, when encoding is performed using a convolutional code having an encoding rate of m / n, an n-bit symbol, that is, n encoded signal sequences are formed. It is advisable to prepare them individually and make them different in the crossover method.

In the above embodiment, the case where the error correction is performed only by the convolutional code has been described as an example. However, the present invention is not limited to this, and a block code may be used together. A trellis code may be applied.

In the above embodiment, the case where the coded communication system according to the present invention is applied to a radio transmission system including a radio transmission path and the like has been described as an example. The present invention can also be applied to a system including a wired transmission line to which the generalization is applied.

[0056]

As described above, according to the coded communication system and the transmission error reducing method of the present invention, the error between the coded signal sequences can be reduced by making the signal interleaving method of each interleaver and deinterleaver different. It is randomized and the error rate of the decoded signal can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an encoding communication system to which a transmission error reduction method according to the present invention is applied.

FIG. 2 is a diagram illustrating a first interleaver crossing method according to the embodiment of FIG. 1;

FIG. 3 is a diagram illustrating a first deinterleaver reverse-crossing method according to the embodiment of FIG. 1;

FIG. 4 is a diagram illustrating a second interleaver crossing method according to the embodiment of FIG. 1;

FIG. 5 is a diagram showing a reverse deinterleaving method of the second deinterleaver according to the embodiment of FIG. 1;

[Description of Codes] 10 Transmitter 20 Receiver 100 Encoding circuit 102,104 Interleaver 106 Modulation circuit 200 Demodulation circuit 202,204 Deinterleaver 206 Decoding circuit

Claims (15)

[Claims] 1. An encoding communication system for encoding and transmitting information, comprising: encoding means for encoding input information into a plurality of encoded signal sequences using an encoding method including an error correction code. A transmitting apparatus, comprising: a plurality of interleavers for rearranging and outputting signals for each encoded signal sequence encoded by the encoding means; and a modulation means for modulating a signal from the interleaver by a predetermined modulation scheme. Demodulation means for demodulating a signal received from the transmission device via a predetermined transmission path by a predetermined demodulation method, and a coded signal demodulated by the demodulation means by rearrangement reverse to that of the interleaver. A plurality of deinterleavers that rearrange in the original order to obtain the original coded signal sequence, and a receiving device that includes decoding means for decoding the coded signal sequence from the deinterleaver and reproducing the original information. And, the system comprising the at interleaver and deinterleaver, with different interleaving method of the respective coded signals each sequence, coding communication system, characterized by randomizing the transmission error between the signals. 2. The system according to claim 1, wherein said encoding means encodes information using an error correction code including a convolutional code having a coding rate of m / n, and said interleaver and deinterleaver at least each An encoding communication system, wherein n encoding methods are prepared, and a crossing method is different for each encoded signal sequence. 3. The system according to claim 1, wherein the interleaver and the deinterleaver are:
The system further includes a two-dimensional array memory, and the system further comprises interleaving control means for changing the interlacing method for each coded sequence signal by changing the writing position or the reading order of the coded signal to each two-dimensional array memory. A coded communication system comprising: 4. A transmitting apparatus in an encoding communication system for encoding information and transmitting the encoded information to a predetermined transmission path, the apparatus comprising: a plurality of encoded signal sequences encoded by an encoding system including an error correction code; A plurality of interleavers for respectively rearranging and outputting signals for each coded signal sequence coded by the coding unit; and modulating a signal from the interleaver by a predetermined modulation method. A transmitting unit in the coded communication system, wherein the interleaver has a different rearrangement order of signals for each coded signal sequence. 5. The apparatus according to claim 4, wherein said encoding means encodes information using an error correction code including a convolutional code having an encoding rate of m / n, and at least n interleavers are provided. A transmitting apparatus in the coded communication system, wherein the rearrangement order of signals for each coded signal sequence is different. 6. The apparatus according to claim 4, wherein each of the interleavers includes a two-dimensional array memory, and determines an order of a writing position or a reading order of a signal for each encoded signal sequence in each of the two-dimensional array memories. A transmitting apparatus in a coded communication system, comprising: a memory control unit for changing the order of rearrangement of signals for each coded signal sequence by changing the order. 7. The device according to claim 6, wherein the memory control means changes the order of writing positions of signals for each coded signal sequence to each two-dimensional array memory by the memory control means. A transmitting apparatus in a coded communication system, wherein the order of rearranging signals for each coded signal sequence in each interleaver is made different. 8. The apparatus according to claim 6, wherein the memory control means causes the order of reading signals for each encoded signal sequence from each two-dimensional array memory to be different, and Wherein the order of rearranging signals for each coded signal sequence in the interleaver is changed. 9. The apparatus according to claim 6, wherein said memory control means controls the order of writing positions of signals for each encoded signal sequence to each two-dimensional array memory and the encoded signal sequence. A transmitting apparatus in an encoding communication system, characterized in that the order of reading signals for each interleaver is made different so that the order of rearranging signals for each encoded signal sequence in each interleaver is made different. 10. A receiving apparatus in a coded communication system for receiving a signal transmitted from the transmitting apparatus according to claim 4 through a predetermined transmission path, wherein the apparatus transmits the received signal. Demodulation means for demodulating by a predetermined demodulation method; a plurality of deinterleavers for rearranging the signals demodulated by the demodulation means in a predetermined order to return to the original coded signal sequence; and rearranging the signals by the deinterleaver. Decoding means for decoding an encoded signal sequence to reproduce original information, wherein the deinterleaver is capable of changing a rearrangement order according to a rearrangement order of the interleaver of the transmitting apparatus. A receiving device in an encoding communication method, comprising an array memory and a memory control unit. 11. The receiving device according to claim 10, wherein
Wherein the memory control means changes the order of writing positions of signals to the respective two-dimensional array memories and returns the read signals to the original sequence of coded signal sequences. apparatus. 12. The receiving device according to claim 10, wherein
A receiving device in the coded communication system, characterized in that the memory control means changes the reading order of the signals from the two-dimensional array memories and returns the signals to the coded signal sequences in the original order. 13. The receiving device according to claim 10, wherein
The memory control means changes the order of the write position of the signal to each two-dimensional array memory and the order of the read of the stored signal to return the signal to the signal of each encoded signal sequence in the original order. A receiving device in the coded communication system. 14. A transmission error reducing method for randomizing a continuous error of a signal generated at the time of transmission when information is transmitted through a predetermined transmission path and reducing the transmission error, the method comprising: A first step of encoding information to be encoded into a plurality of encoded signal sequences by an encoding method including an error correction code, and a signal for each encoded signal sequence encoded in the first step is converted into a signal A second step of rearranging the sequence by making the interlacing method different for each sequence; a third step of modulating and transmitting the encoded signal from the second step by a predetermined modulation method; and a third step. A fourth step of receiving the signal transmitted at the predetermined time via a predetermined transmission path; a fifth step of demodulating the signal received at the fourth step by a predetermined demodulation method; What is the second step for the signal demodulated in the step A fifth step of returning to the original order by reverse rearrangement, and a sixth step of decoding the encoded signal sequence rearranged in the original order in the fifth step to reproduce the original information; A transmission error reduction method in a coded communication system, comprising: 15. The method according to claim 14, wherein said first step includes the step of encoding information with an error correcting code including a convolutional code of a coding rate m / n, wherein said second step includes: The step and the fifth step are characterized in that the interlacing method is different for each of the n coded signal sequences that have been coded.