Title :
Performance of continuous and blockwise decoded turbo codes
Author :
Benedetto, Sergio ; Montorsi, Guido
Author_Institution :
Dipartimento di Elettronica, Politecnico di Torino, Italy
fDate :
5/1/1997 12:00:00 AM
Abstract :
In this letter we define and evaluate the average maximum-likelihood performance of the three ways of co-decoding turbo codes. In all cases the information sequence is split into blocks of N bits (N being the length of the interleaver used by the turbo code), that are encoded by the first constituent encoder and, after interleaving, by the second encoder. In the first operation mode, both constituent encoders work in a continuous fashion, whereas in the second, at the end of each block, a suitably chosen sequence of bits is appended to the information block in order to terminate the trellises of both constituent codes. In the third mode, the operation is similar to the second, but, instead of trellis termination, both constituent encoders are simply reset.
Keywords :
block codes; concatenated codes; convolutional codes; interleaved codes; maximum likelihood decoding; trellis codes; average maximum-likelihood performance; bit error probability; blockwise decoded turbo codes; constituent codes; constituent encoders; continuous decoded turbo codes; hypertrellis; information sequence; interleaving; parallel concatenated convolutional codes; trellis termination; turbo codes co-decoding; Concatenated codes; Convolutional codes; Encoding; Interleaved codes; Iterative algorithms; Iterative decoding; Maximum likelihood decoding; Performance analysis; Proposals; Turbo codes;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.585802