Summary form only given, as follows. Binary interleaved coding was first introduced by Massey for the ideal M-qry direct-detection optical PPM channel and subsequently extended by Bechtel and Modestino to the degraded optical PPM channel where dark current is allowed. In either case, binary interleaved coding has been shown to offer potential performance/complexity advantages over more conventional M-ary coding schemes, such as Reed-Solomon (RS) codes. The authors investigate the performance/complexity issues associated with a specific implementation of binary interleaved coding for the direct-detection optical PPM channel, although the approach is applicable to more general M-ary orthogonal channels, such as noncoherent MFSK. In this scheme, with M = 2L, the L parallel binary channels are separately and independently encoded. The decoding strategy, however, exploits the correlation of errors and erasures on the L parallel binary channels. More specifically, the L decoders are operated sequentially with the location of binary symbol errors determined and passed on to subsequent decoders. The symbol positions corresponding to previously located errors are then erased and the subsequent decoder is allowed to operate in an errors-and-erasures mode. This process continues until all L decoders have completed their operation, in which case the corresponding sequence of M-ary decisions are announced.
|Title of host publication||Unknown Host Publication Title|
|Place of Publication||New York, NY, USA|
|Publisher||Publ by IEEE|
|Volume||25 n 13|
|State||Published - Dec 1 1988|
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