DocumentCode :
3046489
Title :
A 100 Mbit/s Viterbi decoder chip: novel architecture and its realization
Author :
Fettweis, Gerhard ; Meyr, Heinrich
Author_Institution :
Aachen Univ. of Technol., West Germany
fYear :
1990
fDate :
16-19 Apr 1990
Firstpage :
463
Abstract :
Installing new high-speed digital microwave and satellite communication links often leads to the need for fast Viterbi decoders (VDs). However, the main unit of a VD contains a nonlinear data-dependent feedback loop that limits the maximum achievable throughput rate. A conventional realization of this loop leads to the problem that good decoder performance requires a large wordlength, whereas a high data rate requires a small wordlength. The authors present an architecture which eliminates this trade-off by bit-level parallel processing. The architecture was used in the design of a fabricated 115 Mb/s VD chip for an 8-PSK (phase-shift keying) trellis code. This represents the fastest single-chip VD built to date. The less complex design (<9000 gates) shows that the proposed architecture allows the single-chip realization of high-speed VDs with large wordlength and a larger number of states. It is shown that this architecture can also be applied to other related problems
Keywords :
codecs; parallel architectures; 100 Mbit/s; 8-PSK trellis code; Viterbi decoder chip; architecture; bit-level parallel processing; digital communication links; high-speed; microwave communication links; nonlinear data-dependent feedback loop; satellite communication links; Convolutional codes; Feedback loop; Maximum likelihood decoding; Maximum likelihood estimation; Microwave technology; Parallel processing; Satellite communication; State estimation; Throughput; Viterbi algorithm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 1990. ICC '90, Including Supercomm Technical Sessions. SUPERCOMM/ICC '90. Conference Record., IEEE International Conference on
Conference_Location :
Atlanta, GA
Type :
conf
DOI :
10.1109/ICC.1990.117124
Filename :
117124
Link To Document :
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