標題: Predictive Coding of Bit Loading for Time-Correlated MIMO Channels With a Decision Feedback Receiver
作者: Li, Chien-Chang
Lin, Yuan-Pei
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: MIMO;limited feedback;differential feedback;predictive quantization;bit loading;variable rate transmission
公開日期: 1-Jul-2015
摘要: In this paper, we consider variable-rate transmission over a slowly varying multiple-input multiple-output (MIMO) channel with a decision feedback receiver. The transmission rate is adapted to the channel by dynamically assigning bits to the subchannels of the MIMO system. Predictive quantization is used for the feedback of bit loading to take advantage of the time correlation inherited from the temporally correlated channel. Due to the use of decision feedback at the receiver, the bit loading is related to the Cholesky decomposition of the channel Gram matrix. Assuming the channel is modeled by a slowly varying Gauss-Markov process, we show that the nested submatrices generated during the process of Cholesky decomposition can be updated as time evolves. Based on the update, we derive the optimal predictor of the next bit loading for predictive quantization. Furthermore, we derive the statistics of the prediction error, which are then exploited to design the quantizer to achieve a smaller quantization error. Simulations are given to demonstrate that the proposed predictive quantization gives a good approximation of the desired transmission rate with a low feedback rate.
URI: http://dx.doi.org/10.1109/TSP.2015.2421471
http://hdl.handle.net/11536/127878
ISSN: 1053-587X
DOI: 10.1109/TSP.2015.2421471
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 63
Issue: 13
起始頁: 3376
結束頁: 3386
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