Power efficient viterbi decoder based on pre-computation technique for portable digital multimedia broadcasting receiver

Title
Power efficient viterbi decoder based on pre-computation technique for portable digital multimedia broadcasting receiver
Authors
Kim, D.S.; Lee, S.Y.; Wang, K.Y.; Hwang, J.H.; Chung, D.J.
Keywords
digital multimedia broadcasting (DMB), viterbi decoder, pre-computation
Issue Date
2007-05
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
Digital multimedia broadcasting (DMB) is a reliable multi-service system for mobile and portable receivers. DMB system allows interference-free reception under the conditions of multipath propagation and transmission errors using coded orthogonal frequency division multiplexing modulation (COFDM) and unequal error protection (UEP) scheme. For error correction of portable DMB receivers, punctured convolutional code and viterbi decoder is developed but it needs lots of computations for real-time operation. So, it is desired to design a high speed and low-power hardware scheme for viterbi decoder. This paper proposes a combined add-compare-select (ACS) and path metric normalization (PMN) unit using pre-computation technique for DMB system. The proposed PMN unit reduces the critical path by applying fixed value selection algorithm using the comparison tree properties. We also propose an ACS structure using the decomposition and pre-computation technique for reducing the complexity of the adder, comparator and multiplexer. Simulation results shows that area, gate delay and power consumption are reduced about 3.78 %, 23.80 %, and 12.22 %, respectively.
URI
http://dspace.inha.ac.kr/handle/10505/1879
ISSN
0098-3063
Appears in Collections:
College of Engineering(공과대학) > Information and Communication Engineering (정보통신공학) > Journal Papers, Reports(정보통신공학 논문, 보고서)
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