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Opportunistic Random Beamforming with Precoding for Spatially Correlated Channels
 

Summary: 1
Opportunistic Random Beamforming with
Precoding for Spatially Correlated Channels
Tareq Y. Al-Naffouri
Abstract-- It has been showed recently that dirty paper coding
(DPC) achieves optimum sum-rate capacity in a multi-antenna
broadcast channel with full channel state information at the
transmitter. With only partial feedback, random beamforming
(RBF) is able to match the sumrate of DPC for large number
of users. However, in the presence of spatial correlation, RBF
incurs an SNR hit as compared to DPC. In this letter, we explore
precoding techniques to reduce the effect of correlation on RBF.
We thus derive the optimum precoding matrix that minimizes
the rate gap between DPC and RBF. Given the numerical com-
plexity involved in calculating the optimum precoder, we derive
approximate precoding matrices that are close in performance
to the optimum precoder.
I. INTRODUCTION
Consider a broadcast scenario where a base station with
M antennas is to broadcast to n users each equipped with

  

Source: Al-Naffouri, Tareq Y. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering