Title :
A novel high-speed trellis-coded modulation codec
Author :
Hu, Xiao ; Dinh, Anh
Author_Institution :
Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada
Abstract :
The trellis-coded modulation (TCM) is used in bandlimited communication systems. TCM efficiency improves coding gain by combining the operation of baseband modulation and forward error correction coding. A novel TCM encoder/decoder ASIC implementation is provided in this paper. Instead of generating the history minimum accumulate distance metric and path metric, a current minimum accumulate distance is used to control the history path to determine errors in the code. This implementation not only increases decoding speed but also reduces hardware complexity. VHDL code was written for an 8-state, radix-4 TCM codec with 2D and 4D implementation. Simulation results show a throughput of 460 Mbps and 920 Mbps in 0.18 μm CMOS technology.
Keywords :
CMOS integrated circuits; bandlimited communication; circuit complexity; circuit simulation; codecs; error correction codes; hardware description languages; integrated circuit design; trellis coded modulation; 0.18 micron; 2D implementation; 460 Mbit/s; 4D implementation; 920 Mbit/s; CMOS technology; TCM efficiency; TCM encoder/decoder ASIC implementation; VHDL code; bandlimited communication systems; baseband modulation; code errors; codec throughput; coding gain; current minimum accumulate distance; decoding speed; eight-state radix-4 TCM codec; forward error correction coding; hardware complexity; high-speed trellis-coded modulation codec; history minimum accumulate distance metric; history path control; path metric; simulation; Application specific integrated circuits; Baseband; CMOS technology; Codecs; Decoding; Error correction codes; Forward error correction; Hardware; History; Modulation coding;
Conference_Titel :
Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on
Print_ISBN :
0-7803-7514-9
DOI :
10.1109/CCECE.2002.1015262
