Effect of transmit correlation on the sum-rate capacity of two-user broadcast channels

Author

Lee, Jin-Woo ; Ko, Jae-Yun ; Lee, Yong-Hwan

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea

Volume

57

Issue

9

fYear

2009

fDate

9/1/2009 12:00:00 AM

Firstpage

2597

Lastpage

2599

Abstract

This letter investigates the effect of the transmit correlation on the sum-rate capacity of a two-user broadcast channel (BC) with the use of equal-power allocation in high signal-to-noise ratio (SNR) environments. It is shown using an upper-bound analysis that the sum-rate capacity of a correlated two-user BC at high SNR highly depends on the phase difference between the transmit correlation coefficients of two users as well as the magnitude of the transmit correlation coefficients, and it is maximized (or minimized) when the principal eigenvectors of the transmit correlation matrix of two users are orthogonal (or parallel) to each other. The analytic results are verified by computer simulation.

Keywords

broadcast channels; correlation methods; eigenvalues and eigenfunctions; radio transmitters; wireless channels; equal power allocation; principal eigenvector; sum-rate capacity; transmit correlation; two user broadcast channels; upper bound analysis; Antenna measurements; Base stations; Broadcasting; Channel capacity; Computer simulation; Helium; MIMO; Receiving antennas; Signal to noise ratio; Transmitting antennas; Broadcast channel (BC), sum-rate capacity, transmit correlation.;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.09.070513

Filename

5281749