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Power Loading Algorithm for Orthogonalized Spatial Multiplexing in Wireless Communications  

Kim, Young-Tae (고려대학교 전자전기공학과 무선통신 연구실)
Park, Seok-Hwan (고려대학교 전자전기공학과 무선통신 연구실)
Lee, In-Kyu (고려대학교 전기전자전파공학부 무선통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.5A, 2009 , pp. 331-340 More about this Journal
Abstract
In this paper, we propose a new power loading algorithm for orthogonalized spatial multiplexing(OSM) systems over flat-fading multiple-input multiple-output (MIMO) channels. Compared to SVD-based transmission scheme, the OSM scheme exhibits a good system performance with lower complexity and feedback overhead. To further improve the performance in OSM systems with power loading, we introduce a geometric approach on the Euclidean distance between the constellation points in the effective channel. Using this approach, we show that the optimal power loading parameters in terms of the minimum distance can be obtained. Simulation results demonstrate that our algorithm provides a 5dB gain at a bit error rate (BER) of $10^{-4}$ over that of no power loading case with both QPSK and 16-QAM. Consequently, our power loading algorithm allows us to significantly improve the system performance with one additional feedback value.
Keywords
MIMO; Closed loop; power allocation; maximizing dmin;
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