Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Feedback Quantization for Linear Precoded Spatial Multiplexing | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 683030 13 pages doi 2008 683030 Research Article Feedback Quantization for Linear Precoded Spatial Multiplexing Claude Simon and Geert Leus Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands Correspondence should be addressed to Claude Simon Received 15 June 2007 Revised 19 October 2007 Accepted 8 January 2008 Recommended by David Gesbert This paper gives an overview and a comparison of recent feedback quantization schemes for linear precoded spatial multiplexing systems. In addition feedback compression methods are presented that exploit the time correlation of the channel. These methods can be roughly divided into two classes. The first class tries to minimize the data rate on the feedback link while keeping the performance constant. This class is novel and relies on entropy coding. The second class tries to optimize the performance while using the maximal data rate on the feedback link. This class is presented within the well-developed framework of finite-state vector quantization. Within this class existing as well as novel methods are presented and compared. Copyright 2008 C. Simon and G. Leus. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION An attractive scheme to make spatial multiplexing more robust against rank deficient channels and to reduce the receiver complexity is linear precoding. The linear precoding matrix is a function of the channel state information CSI which is in general only available at the receiver. Thus the required information to calculate the precoding matrix must be fed back to the transmitter over a feedback link which is assumed to be data-rate
