Title :
Multiuser MIMO-MAC capacity in the low SNR regime: Channel knowledge and double-scattering
Author :
Li, Xiao ; Jin, Shi ; McKay, Matthew R. ; Gao, Xiqi ; Wong, Kai-Kit
Author_Institution :
Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing
Abstract :
We investigate 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. For each user, the MIMO channel is modeled according to a general class of stochastic channel matrices, known as double-scattering. Assuming that each user knows only their own spatial correlation matrices and employs optimal statistical beamforming transmission, we present new analytical approximations for the sum capacity of the MIMO-MAC for low SNR values. Our approximations are accurate, and lead to key insights into the effect of correlation.
Keywords :
MIMO communication; matrix algebra; multi-access systems; multiuser channels; stochastic processes; MIMO channel; SNR regime; channel knowledge; double scattering; multiple access channel; multiple-input multiple-output channel; optimal statistical beamforming transmission; signal-to-noise ratio; spatial correlation matrices; stochastic channel matrices; uplink multiuser MIMO-MAC capacity; AWGN; Array signal processing; Covariance matrix; MIMO; Mobile communication; Receiving antennas; Signal to noise ratio; Transmitters; Transmitting antennas; Wideband; Double-scattering; MIMO systems; Multiple access channel;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2009. ICASSP 2009. IEEE International Conference on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2353-8
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2009.4960112
