Capacity of MIMO-MAC with transmit channel knowledge in the low SNR regime

Author

Li, Xiao ; Jin, Shi ; McKay, Matthew R. ; Gao, Xiqi ; Wong, Kai-Kit

Author_Institution

Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China

Volume

9

Issue

3

fYear

2010

fDate

3/1/2010 12:00:00 AM

Firstpage

926

Lastpage

931

Abstract

We study the sum capacity of the uplink multiuser multiple-input multiple-output (MIMO) multiple-access channel (MAC) in the low signal-to-noise ratio (SNR) regime under double-scattering and Rician fading scenarios. The receiver is assumed to have perfect channel state information (CSI), while each transmitter knows only its statistical CSI. We first derive analytical expressions for the minimum Â¿_b/N₀ and the wideband slope of MIMO systems employing statistical beamforming, based on which we then present new analytical approximations for the sum capacity of the MIMO-MAC at low SNRs, and investigate the effects of transmit, receive and scatterer correlation, as well as Rician K-factor.

Keywords

MIMO communication; access protocols; array signal processing; channel capacity; fading channels; MIMO system slope; MIMO-MAC; Rician K-factor; channel state information; low SNR regime; scatterer correlation; statistical beamforming; transmit channel knowledge; uplink multiuser multiple-input multiple-output multiple-access channel; Array signal processing; Channel state information; Information analysis; MIMO; Mobile communication; Rician channels; Scattering; Signal to noise ratio; Transmitters; Wideband; Capacity, double scattering, low SNR, MAC, MIMO, Rician fading.;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2010.03.090266

Filename

5427421