EURASIP Journal on Advances in Signal Processing 
Volume 2008 (2008), Article ID 683030, 13 pages
doi:10.1155/2008/683030
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
Received 15 June 2007; Revised 19 October 2007; Accepted 8 January 2008

Recommended by David Gesbert

Abstract

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.