JP2006060383A5

JP2006060383A5 -

Info

Publication number: JP2006060383A5
Application number: JP2004238376A
Authority: JP
Filing date: 2004-08-18
Publication date: 2007-08-30

Claims

A single channel code symbol after channel coding is transmitted by being divided into a plurality of streams on the transmitting side, a plurality of stream signals are received on the receiving side, a single received code symbol is synthesized, and a communication channel is obtained by maximum likelihood decoding. A wireless communication system that corrects errors,
In the communication apparatus on the transmission side, a punctured symbol pattern to be collectively applied to the code symbol is created according to the modulation mode assigned to each stream, and is unnecessary from the code symbol according to the created punctured symbol pattern. Generate punctured symbols from which symbols are removed, send them to each stream,
The communication apparatus on the reception side creates the same punctured symbol pattern as that used on the transmission side, inserts the erasure symbol at the unnecessary symbol position removed on the transmission side, and sets the maximum of the received code symbol. Perform likelihood decoding,
A wireless communication system.

A wireless communication device that transmits transmission data by dividing it into a plurality of streams,
Frame generating means for dividing the transmission data into a data sequence of an appropriate number of bits;
Channel coding means for channel-coding the transmission data sequence to generate one system of code symbols;
Punctured symbol pattern generating means for generating punctured symbol patterns to be collectively applied to code symbols in accordance with modulation modes assigned to the respective streams;
Symbol allocating means for generating a punctured symbol obtained by removing unnecessary symbols from a code symbol according to the created punctured symbol pattern, and distributing the punctured symbol to each stream;
Transmitting means for modulating and transmitting the punctured symbols of each stream;
A wireless communication apparatus comprising:

The punctured symbol pattern generation means collectively applies the punctured symbol patterns corresponding to the modulation modes assigned to the respective streams to the code symbols by arranging the punctured symbol patterns according to the order in which the streams are combined. Create a punctured symbol pattern,
The wireless communication apparatus according to claim 2.

Necessary to appropriately divide the transmission data sequence into multiple streams according to the transmission stream control data such as the number of streams, the number of transmission data bits per stream, the modulation mode and the modulation rate for each stream, etc. Further comprising transmission stream control means for determining various parameters and outputting them as transmission control information,
The frame generation means divides transmission data into a data sequence of an appropriate number of bits according to the transmission control information,
The channel coding means performs continuous convolutional coding without resetting the coding means when performing continuous coding on a data sequence according to the transmission control information, and performs burst coding. Performs a convolutional encoding by adding tail bits to a data sequence divided into burst units, and outputs a code symbol for each,
The punctured symbol pattern generating means generates a punctured symbol pattern according to the transmission control information,
The symbol distribution means distributes punctured symbols to each stream according to the transmission control information,
The transmission means sets a transmission power value of each stream according to the transmission control information;
The wireless communication apparatus according to claim 2.

The transmission stream control means calculates the efficiency of all streams from the modulation scheme and coding rate assigned to each stream, calculates the number of punctured symbols for each stream based on each efficiency, The punctured symbol pattern generation is performed so that the allocation timing and the punctured symbol position suitable for the coding rate are determined, and the punctured symbol pattern is collectively allocated from the code symbol and allocated to a plurality of streams. Each parameter to be provided to the means and the symbol distribution means,
The wireless communication apparatus according to claim 2.

The transmission stream control means sets transmission power according to the allowable BER and modulation mode determined for each layer corresponding to each stream when performing burst encoding, and when performing continuous decoding, propagation of each stream. Determining transmission control information parameters related to the transmission means so as to set the transmission power so that the estimated BER values when decoding through the channel model estimated for each path are equal;
The wireless communication apparatus according to claim 4.

A wireless communication device that receives transmission data divided into a plurality of streams,
Demodulation means for performing soft decision demodulation corresponding to the modulation scheme assigned to each stream;
Symbol synthesis means for synthesizing symbols of a plurality of streams subjected to soft decision demodulation into a symbol sequence before distribution on the transmission side;
Punctured symbol pattern generating means for generating punctured symbol patterns to be collectively applied to code symbols in accordance with modulation modes assigned to the respective streams;
Using the created punctured symbol pattern, erasure symbol insertion means for inserting a erasure symbol at an unnecessary symbol position removed on the transmission side on the symbol sequence and outputting a reception code symbol;
Viterbi decoding means for performing maximum likelihood decoding of received code symbols and performing channel error correction;
A wireless communication apparatus comprising:

The punctured symbol pattern generation means collectively applies the punctured symbol patterns corresponding to the modulation modes assigned to the respective streams to the code symbols by arranging the punctured symbol patterns according to the order in which the streams are combined. Create a punctured symbol pattern,
The wireless communication apparatus according to claim 7.

When the transmission data is hierarchized and burst coding is performed, the Viterbi decoding means, when the path memory length of the maximum likelihood path is longer than the burst data length delimited by the tail bits, to the first burst data For the corresponding received code symbol, an ACS operation is performed from the beginning of the burst to store the maximum likelihood path, and after the ACS processing of the received code symbol corresponding to the last bit of the tail bit is completed, the traceback is performed from the state corresponding to the tail bit. , The transmission bit for one burst is decoded, the internal state of the Viterbi decoding means is reset for the received code symbol corresponding to the second burst data to be input, and the ACS operation is performed. Memorize the maximum likelihood path and repeat the same process as the previous burst,
The wireless communication apparatus according to claim 7.

When the transmission data is hierarchized and burst coding is performed, the Viterbi decoding means performs burst for the received code symbol corresponding to the first burst when the path memory length of the maximum likelihood path is shorter than the burst data length. ACS operation is performed from the beginning to generate the maximum likelihood path, and the maximum likelihood path is stored in the path memory in which the optimal path memory length is set for the modulation mode of the stream, and the maximum likelihood path reaches the maximum path memory length. When the received code symbol corresponding to the final bit of the tail bit is input, decoding by the traceback is started from the time when the traceback is started. For the received code symbol corresponding to the input second burst data, the internal state of the Viterbi decoding means is reset and the ACS operation is performed. Te generates a maximum likelihood path, a path memory for setting the optimal path memory length modulation mode of the burst store outermost likelihood path, to click the same processing as before the burst,
The wireless communication apparatus according to claim 7.

When continuous encoding is performed on transmission data without hierarchization, the Viterbi decoding means uses the modulation scheme with the largest modulation multi-level number among all streams, or the highest coding rate, soft decision for each of a plurality of streams An optimal path memory length is set from the level distribution value, ACS operation is performed to generate and store the maximum likelihood path, and decoding by traceback is started when the maximum likelihood path reaches the maximum path memory length. Perform bitwise decoding,
The wireless communication apparatus according to claim 7.

The received stream control means calculates the efficiency of all streams from the modulation scheme and coding rate assigned to each stream, calculates the number of punctured symbols for each stream based on each efficiency, Determine the allocation timing and punctured symbol position according to the coding rate, assign the punctured symbol pattern to the symbol sequence at once, and insert the lost symbol at the unnecessary symbol position removed on the transmission side. Determining each parameter to be provided to the punctured symbol pattern generation means and the erasure symbol insertion means so as to output a received code symbol;
The wireless communication apparatus according to claim 7.

A wireless communication method for transmitting transmission data by dividing it into a plurality of streams,
A frame generation step of dividing the transmission data into a data sequence of an appropriate number of bits;
A channel encoding step of channel-coding the transmission data sequence to generate one system of code symbols;
A punctured symbol pattern generating step for creating a punctured symbol pattern to be applied to the code symbols in a batch according to a modulation mode assigned to each stream;
A symbol allocating step of generating a punctured symbol by removing unnecessary symbols from a code symbol according to the created punctured symbol pattern, and allocating the punctured symbol to each stream;
A transmission step of modulating and transmitting the punctured symbols of each stream;
A wireless communication method comprising:

A wireless communication method for receiving transmission data in which transmission data is divided into a plurality of streams,
A demodulation step for performing soft decision demodulation corresponding to a modulation scheme assigned to each stream;
A symbol synthesizing step for synthesizing symbols of a plurality of streams subjected to soft decision demodulation into a symbol sequence before distribution on the transmission side;
A punctured symbol pattern generating step for creating a punctured symbol pattern to be applied to the code symbols in a batch according to a modulation mode assigned to each stream;
Using the created punctured symbol pattern, an erasure symbol insertion step of inserting a erasure symbol at an unnecessary symbol position removed on the transmission side on the symbol sequence and outputting a reception code symbol;
A Viterbi decoding step for performing maximum likelihood decoding of a received code symbol and performing channel error correction;
A wireless communication method comprising:

A computer program written in a computer-readable format to execute an encoding process for dividing transmission data into a plurality of streams for transmission on a computer,
A punctured symbol pattern generation procedure for creating a punctured symbol pattern to be collectively applied to a single code symbol according to a modulation mode assigned to each stream;
A symbol distribution procedure for generating a punctured symbol by removing unnecessary symbols from a code symbol according to the generated punctured symbol pattern, and distributing the punctured symbol to each stream;
A computer program for executing

A computer program written in a computer-readable format so as to execute a decoding process for receiving transmission data in which one system of code symbols is divided into a plurality of streams, on the computer,
A symbol synthesizing procedure for synthesizing symbols of a plurality of streams that have been subjected to soft decision demodulation corresponding to a modulation scheme assigned to each stream into a symbol sequence before distribution on the transmission side;
A punctured symbol pattern generation procedure for creating a punctured symbol pattern to be applied to code symbols in accordance with a modulation mode assigned to each stream;
Using the created punctured symbol pattern, an erasure symbol insertion procedure for inserting a erasure symbol at an unnecessary symbol position removed on the transmission side on the symbol sequence and outputting a received code symbol;
A Viterbi decoding procedure for performing maximum likelihood decoding of a received code symbol and performing channel error correction;
A computer program for executing