標題: FEEDBACK OF DIFFERENTIAL PRECODER FOR GEOMETRICAL MEAN DECOMPOSITION SYSTEMS
作者: Chen, Hung-Chun
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 system;precoder;differential feedback;time-correlated channel;geometrical mean decomposition
公開日期: 2016
摘要: For a time-correlated channel, we consider the differential feedback of the geometrical mean decomposition (GMD) precoder, which is known to be optimal for a number of criteria. When the channel varies slowly, we can expect the optimal GMD precoders of consecutive channel uses to be close. We consider the feedback of the so-called differential precoder and show that it lies in a neighborhood of the identity matrix using matrix perturbation theory. Furthermore the radius of the neighborhood is proportional to a time-correlation parameter. Such a characterization is crucial for efficient quantization of the differential precoder. Simulations are given to demonstrate that, with a small feedback rate, the performance of the proposed differential GMD comes close to the case when perfect channel state information is available to the transmitter.
URI: http://hdl.handle.net/11536/136365
ISBN: 978-1-4799-9988-0
ISSN: 1520-6149
期刊: 2016 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING PROCEEDINGS
起始頁: 3876
結束頁: 3880
顯示於類別:會議論文