The Performance of ST-Turbo TC Based on the Improved Log-MAP Algorithm

Authors:
Yao-Jun Wu;Li-Xin Li;Ya-Wei Wu
Affiliations:
School of Information Science and Engineering, East China University of Science and Technology, Shanghai, China;School of Information Science and Engineering, East China University of Science and Technology, Shanghai, China;School of Information Science and Engineering, East China University of Science and Technology, Shanghai, China
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

The iterative decoding in turbo code has very high decoding complexity. This paper adopts the improved Log-MAP algorithm for decoding of Space-Time Turbo Trellis Code (ST-Turbo TC) in the slow Rayleigh fading channels. Using the MacLaurin formulae, the proposed algorithm expands the logarithmic function of the Log-MAP. It makes the computation much easier and the operation of the hardware system much faster. Simulation results show that the proposed algorithm performs very closely to the Log-MAP algorithm for decoding of ST-Turbo TC in slow Rayleigh fading channels.