Title :
Low SNR Capacity of Fading Channels -MIMO and Delay Spread
Author :
Sethuraman, V. ; Ligong Wang ; Hajek, B. ; Lapidoth, A.
Author_Institution :
Qualcomm, Campbell
Abstract :
Discrete-time Rayleigh fading multiple-input multiple-output (MIMO) channels are considered, with no channel state information at the transmitter and receiver. The fading is assumed to be correlated in time and independent from antenna to antenna. Peak and average transmit power constraints are imposed, either on the sum over antennas, or on each individual antenna. In both cases, an upper bound and an asymptotic lower bound, as the signal-to-noise ratio approaches zero, on the channel capacity are presented. The limit of normalized capacity is identified under the sum power constraints, and, for a subclass of channels, for individual power constraints. These results carry over to a SISO channel with delay spread (i.e. frequency selective fading).
Keywords :
MIMO communication; Rayleigh channels; antenna arrays; channel capacity; MIMO; SISO channel; average transmit power constraints; channel capacity; channel state information; delay spread; discrete-time Rayleigh fading multiple-input multiple-output channels; normalized capacity; peak transmit power constraints; signal-to-noise ratio capacity; Channel capacity; Channel state information; Delay; Fading; MIMO; Rayleigh channels; Signal to noise ratio; Transmitters; Transmitting antennas; Upper bound; Gauss Markov fading; Low SNR; MIMO; channel capacity; correlated fading; frequency selective fading;
Conference_Titel :
Information Theory, 2007. ISIT 2007. IEEE International Symposium on
Conference_Location :
Nice
Print_ISBN :
978-1-4244-1397-3
DOI :
10.1109/ISIT.2007.4557277