Multipurpose high-coding-gain 0.8- mu m BiCMOS VLSIs for high-speed multilevel trellis-coded modulation

Multilevel trellis-coded quadrature-amplitude-modulated (QAM) VLSIs were designed and developed. These VLSIs realize a coding gain of 7.9 dB with SPORT-256 QAM. The VLSIs contain an encoder, mapper, and decoder for trellis-coded 16, 32, 64, 128, and 256 QAM utilizing general mapping. Using small-size and low-power path memory, 150 K gates were achieved using two chips with die sizes of 8 mm*11 mm and 14 mm*14 mm. The VLSIs achieve a maximum data throughput rate of 17 MBd (guaranteed) and 30 MBd (typical) and dissipate only 1 W at a data rate of 17 MBd. The VLSIs also contain a phase ambiguity rejection circuit for a recovered carrier and error pulse generator. The devices are designed with a BiCMOS 0.8- mu m process rule. The experimental result of bit-error-rate (BER) performance is presented. The VLSIs are effective for outage-free digital microwave radio systems.<
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