Title :
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
fDate :
3/1/2010 12:00:00 AM
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 ¿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.;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.03.090266
