An improved max-log-MAP decoding algorithm for UST symbol-based turbo code

Authors:
Lina Zheng;Ju Liu;Dapeng Zhang;Hui Ji
Affiliations:
School of Information Science & Engineering, Shandong University Jinan, China and National Mobile Communications Research Laboratory, Southeast University Nanjing, China;School of Information Science & Engineering, Shandong University Jinan, China;School of Information Science & Engineering, Shandong University Jinan, China and First Aeronautical College of the Air Force Xinyang, China;School of Information Science & Engineering, Shandong University Jinan, China
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

Citing 3
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Abstract

When signal-to-noise ratio (SNR) is low, the performance of unitary space-time modulation (USTM) is unsatisfactory. A novel scheme employing unitary space-time symbol-based turbo code (UST-SB-TC) can greatly reduce the time delay but its MAP decoding algorithm may cause the system instability. As we know, Log-MAP algorithm needs exponential processing and Max-Log-MAP would inevitably result in performance loss. In this paper, we propose an improved Max-Log-MAP decoding algorithm for UST-SB-TC, whose performance is almost the same as Log-MAP algorithm, but the calculation complexity increasing is very limited.