Title :
A simplification of the Log-MAP algorithm for turbo decoding
Author :
Xi-Zhong, Lou ; Zhi-Gang, Mao ; Yi-zheng, Ye ; Yan-Min, Chen
Author_Institution :
Microelectron. Center, Harbin Inst. of Technol., China
Abstract :
The Log-MAP algorithm and its modifications were proposed to simplify the VLSI implementation of turbo decoding. This work presents a new way to simplify the Log-MAP algorithm, called Shift-Log-MAP as it takes place of log and exp operation with shift. The correction term in the Log-MAP algorithm was transformed to linear function by use of Taylor equation at the slope of 1/2, 1/4, etc. It allows for efficient ASIC implementation and almost has the same performance as the Log-MAP algorithm.
Keywords :
VLSI; application specific integrated circuits; maximum likelihood decoding; transform coding; turbo codes; ASIC implementation; Shift-Log-MAP algorithm; Taylor equation; VLSI implementation; linear function; turbo decoding; AWGN; Additive white noise; Application specific integrated circuits; Equations; Error probability; Iterative algorithms; Iterative decoding; Microelectronics; Turbo codes; Very large scale integration;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1413065
