標題: Lattice Quantization of Phases for Equal Gain Transmission
作者: Tsai, Shang-Ho
Lin, Yuan-Pei
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Beamforming;EGT;equal gain transmission;Grassmannian;lattice;Lloyd;phase quantization;precoding
公開日期: 1-二月-2012
摘要: Equal gain transmission (EGT) requires only the feedback of phase information and is known to enjoy several implementational advantages compared to maximum ratio transmission (MRT). This paper investigates the use of lattice quantization for quantizing phases in EGT systems. In practice, the feedback rate is finite and the lattices need to be truncated to have finite code rate. The truncation of lattices results in boundary effect; hence, earlier results developed for untruncated lattices, e. g., fast algorithm and mean-square error (MSE) analysis, cannot be applied directly. Exploiting the fact that the quantized signals are phases, we show how to quantize using truncated lattices so that there is no boundary effect. Moreover, we propose efficient methods to convert between lattice codewords and binary digits so that the lattice quantization can be used in practical systems. Furthermore, the mean-square quantization error is analyzed for several useful truncated lattices. We also show how to analyze the signal-to-noise ratio (SNR) loss when the proposed quantization is applied to an EGT system.
URI: http://dx.doi.org/10.1109/TSP.2011.2173333
http://hdl.handle.net/11536/15229
ISSN: 1053-587X
DOI: 10.1109/TSP.2011.2173333
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 60
Issue: 2
起始頁: 822
結束頁: 833
顯示於類別:期刊論文


文件中的檔案:

  1. 000299434300022.pdf