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Hybrid Log-MAP Algorithm for Turbo Decoding Over AWGN Channel

Authors:
Li Li Lim
David Wee Gin Lim

Keywords: Log-MAP, turbo codes, correction function, Jacobian logarithm.

Abstract:
In Log-MAP turbo decoding, the complicated log exponential sum is often simplified with the Jacobian logarithm which consists of the max operation along with an exponential correction function. Although the Max-Log-MAP reduces the complexity of the Jacobian logarithm implementation by omitting the correction function, its performance is inferior to the exact Log-MAP algorithm. Hence, a simple approximation to the correction function is needed to complement the Max- Log-MAP algorithm. In this paper, a new suboptimal hybrid Log-MAP algorithm for decoding turbo code is proposed. It approximates the exact Log-MAP accurately and is simple for hardware implementation. The performance of the hybrid Log- MAP algorithm is shown to have the closest performance to the exact Log-MAP solution especially at low SNR. The result of other Log-MAP based algorithm are also presented.

Pages: 211 to 214

Copyright: Copyright (c) IARIA, 2011

Publication date: June 19, 2011

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-140-3

Location: Luxembourg City, Luxembourg

Dates: from June 19, 2011 to June 24, 2011