초록 ▼

An encoder for a wideband CDMA communications system comprises an outer Reed-Solomon code encoder and an inner parallel concatenated convolutional code (PCCC) or turbo code encoder. An iterative PCCC decoder, for decoding the inner code, includes summing functions in forward and feedback paths for p

An encoder for a wideband CDMA communications system comprises an outer Reed-Solomon code encoder and an inner parallel concatenated convolutional code (PCCC) or turbo code encoder. An iterative PCCC decoder, for decoding the inner code, includes summing functions in forward and feedback paths for producing extrinsic information to enhance soft decoding decisions by first and second decoders in successive decoding iterations. An outer code decoder connected following the PCCC decoder also can provide serial feedback information for enhancing iterative decisions by the PCCC decoder.

대표청구항 ▼

[ What is claimed is:] [1.]1. A parallel concatenated convolutional code decoding apparatus comprising:a first convolutional code decoder for providing soft decoding decisions of at least one input signal comprising systematic and parity information;an interleaver;a second convolutional code decoder

[ What is claimed is:] [1.]1. A parallel concatenated convolutional code decoding apparatus comprising:a first convolutional code decoder for providing soft decoding decisions of at least one input signal comprising systematic and parity information;an interleaver;a second convolutional code decoder for providing soft decoding decisions in response to an output from the first decoder derived via the interleaver and a further input signal comprising parity information; anda parallel feedback path including a deinterleaver for feeding back to the first decoder information derived from the second decoder for enhancing soft decoding decisions by the first decoder in at least one subsequent decoding iteration;characterized by further comprising summing functions in the paths from the first decoder to the interleaver and from the second decoder to the deinterleaver for subtracting information from the output of the deinterleaver and interleaver respectively to produce extrinsic information for supply to the interleaver and deinterleaver respectively.