標題: Bit Allocation Schemes for MIMO Equal Gain Precoding
作者: Chao, Chi-Liang
Tsai, Shang-Ho
Hsu, Terng-Yin
資訊工程學系
電機工程學系
Department of Computer Science
Department of Electrical and Computer Engineering
關鍵字: Bit allocation;MIMO;scalar quantized (SQ);equal gain precoder;limited feedback
公開日期: 1-五月-2011
摘要: We design equal gain precoders with scalar quantization in MIMO systems with limited feedback, which do not require the predefined codebook. In such precoders, bit allocation can be used to quantize the precoding vector/matrix to further improve the system performance. There are two conventional bit allocation schemes. One is the uniform bit allocation and the other is the optimal bit allocation obtained by using exhaustive search. The uniform bit allocation is simple but turns out to have obvious performance degradation. On the other hand, the exhaustive search method leads to the optimal performance. However, its computational complexity is extremely high and may be somewhat impractical to be realized. In this paper, we propose two bit allocation schemes for the MIMO equal gain precoder with scalar quantization. Both of the proposed methods are with low complexity and their performance is close to the optimal scheme. Consequently, the proposed bit allocations provide good trade-off between performance and complexity.
URI: http://dx.doi.org/10.1109/TWC.2011.030311.100106
http://hdl.handle.net/11536/8909
ISSN: 1536-1276
DOI: 10.1109/TWC.2011.030311.100106
期刊: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume: 10
Issue: 5
起始頁: 1345
結束頁: 1350
顯示於類別:期刊論文