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Abstract

A communication system containing a constellation encoder, a feedback precoder, and an interleaver that is coupled to the feedback precoder, enables efficient trellis encoding by preventing adjacent transmit symbols from having the same trellis symbol. Consequently, the adverse impact of quantization noise that may occur over adjacent transmitted symbols is minimized. The constellation encoder uses redundant bits that are generated by a trellis encoder connected to the interleaver, the redundant bits being added to an input stream of data bits being provided to the communication system for transmission. The trellis encoder generates the redundant bits based on the interleaved storage of trellis symbols bits in the interleaver.

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First Claim