Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection

Details Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection

2010-06-14

arxiv.org/abs/1006.2758v1

Computer Science

Information Theory

35 pages, 3 figures, to appear in IEEE transactions on signal processing

Scientific paper

This paper studies the sum rate performance of two low complexity eigenmode-based transmission techniques for the MIMO broadcast channel, employing greedy semi-orthogonal user selection (SUS). The first approach, termed ZFDPC-SUS, is based on zero-forcing dirty paper coding; the second approach, termed ZFBF-SUS, is based on zero-forcing beamforming. We first employ new analytical methods to prove that as the number of users K grows large, the ZFDPC-SUS approach can achieve the optimal sum rate scaling of the MIMO broadcast channel. We also prove that the average sum rates of both techniques converge to the average sum capacity of the MIMO broadcast channel for large K. In addition to the asymptotic analysis, we investigate the sum rates achieved by ZFDPC-SUS and ZFBF-SUS for finite K, and show that ZFDPC-SUS has significant performance advantages. Our results also provide key insights into the benefit of multiple receive antennas, and the effect of the SUS algorithm. In particular, we show that whilst multiple receive antennas only improves the asymptotic sum rate scaling via the second-order behavior of the multi-user diversity gain; for finite K, the benefit can be very significant. We also show the interesting result that the semi-orthogonality constraint imposed by SUS, whilst facilitating a very low complexity user selection procedure, asymptotically does not reduce the multi-user diversity gain in either first (log K) or second-order (loglog K) terms.

Affiliated with

Also associated with

No associations

Rating

Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eigen-Based Transceivers for the MIMO Broadcast Channel with Semi-Orthogonal User Selection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-422781