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Published in:
2013 | OriginalPaper | Chapter
A Subcarriers and Bits Allocation Scheme for Multi-User OFDMA System
Authors : Jingxue Ran, Bo Xiao
Published in: Proceedings of The Eighth International Conference on Bio-Inspired Computing: Theories and Applications (BIC-TA), 2013
Publisher: Springer Berlin Heidelberg
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Abstract
In Multiple-In Multiple-Out (MIMO) Broadcast systems with limited feedback, when receivers are equipped with multiple antennas, the so-called quantization error of channel direction matrix were unavoidably introduced. This quantization error will result in the reduction of system capacity since it was referenced in the beam forming design. In this paper, we proposed a robust beam forming method based on MMSE, which considers the statistical characteristics of the quantization error for channel direction matrix. Simulation results show that the proposed method effectively enhanced system capacity, reduced bit error rate (BER), as well as mitigated the Plateau Effect.