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Improvement of the Adaptive Modulation System with Optimal Turbo Coded V-BLAST Technique using STD Scheme  

Ryoo, Sang-Jin (Dept. of Electronics & Computer Eng. Chonnam National University)
Choi, Kwang-Wook (Dept. of Electronics & Computer Eng. Chonnam National University)
Lee, Kyung-Hwan (Dept. of Electronics & Computer Eng. Chonnam National University)
You, Cheol- Woo (Dept. of Communication Eng. Myongji University)
Hong, Dae-Ki (Dept. of I & T Eng. Sangmyoung University)
Hwang, In-Tae (Dept. of Electronics & Computer Eng. Chonnam National University)
Kim, Cheol-Sung (Dept. of Electronics & Computer Eng. Chonnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.2, 2007 , pp. 6-14 More about this Journal
Abstract
In this paper, we propose and observe the Adaptive Modulation system with optimal Turbo Coded V-BLAST (Vertical-Bell-lab Layered Space-Time) technique that is applied the extrinsic information from MAP (Maximum A Posteriori) Decoder in decoding Algorithm of V-BLAST: ordering and slicing. The extrinsic information is used by a priori probability and the system decoding process is composed of the Main Iteration and the Sub Iteration. And comparing the proposed system with the Adaptive Modulation system using conventional Turbo Coded V-BLAST technique that is simply combined V-BLAST with Turbo Coding scheme, we observe how much throughput performance has been improved. In addition, we observe the proposed system using STD (Selection Transmit Diversity) scheme. As a result of simulation, Comparing with the conventional Turbo Coded V-BLAST technique with the Adaptive Modulation systems, the optimal Turbo Coded V-BLAST technique with the Adaptive Modulation systems has better throughput gain that is about 350 Kbps in 11 dB SNR range. Especially, comparing with the conventional Turbo Coded V-BLAST technique using 2 transmit and 2 receive antennas, the proposed system with STD (Selection Transmit Diversity) scheme show that the improvement of maximum throughput is about 1.77 Mbps in the same SNR range.
Keywords
AMC; Turbo Code; V-BLAST; MAP Decoder; Iterative Decoding;
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