Title :
150 KGate general-purpose high-coding-gain TCM VLSIs for high-speed multi-level QAM systems
Author :
Aikawa, Satoru ; Nakamura, Yasuhisa ; Takanashi, Hitoshi
Author_Institution :
NTT Radio Commun. Syst. Lab., Tokyo, Japan
Abstract :
Multilevel trellis-coded QAM (quadrature amplitude modulation) VLSIs were designed and developed. These VLSIs realize a coding gain of 7.9 dB with SPORT-256 QAM. The VLSIs contain an encoder, a mapper, and a decoder for trellis-coded 16, 32, 64, 128, and 256 QAM utilizing general mapping. The VLSIs also function as a phase ambiguity rejection circuit for a recovered carrier and error pulse generator. Using small-size and low-power path memory, 150K gates are achieved utilizing two chips with die sizes of 8×11 mm2 and 14×14 mm2. The VLSIs realize maximum data throughput rates of 17 Mb/s (guaranteed) and 30 Mb/s. The devices are designed with BiCMOS 0.8 μm, utilizing the HSL-FX language for functional design and ALPHA2 for layout design schemes. Experimental results on bit error rate, signature performance, and synchronization performance for phase ambiguity rejection are presented. The developed VLSIs are effective for outage-free digital microwave radio systems
Keywords :
BIMOS integrated circuits; VLSI; amplitude modulation; circuit layout CAD; decoding; digital radio systems; digital signal processing chips; encoding; error statistics; microwave links; 0.8 micron; 150 kgate general-purpose high-coding-gain TCM VLSI; 17 Mbit/s; 30 Mbit/s; ALPHA2; BiCMOS; HSL-FX language; SPORT-256 QAM; bit error rate; decoder; encoder; functional design; high-speed multilevel QAM systems; layout design schemes; mapper; maximum data throughput rates; outage-free digital microwave radio systems; phase ambiguity rejection circuit; signature performance; synchronization performance; Bit error rate; Circuits; Decoding; Hip; Laboratories; Microwave devices; Modems; Modulation coding; Quadrature amplitude modulation; Very large scale integration;
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
DOI :
10.1109/GLOCOM.1990.116822
