Capacity for MIMO systems at low SNR

Author

Ioannou, Ioanna ; Charalambous, Charalambos D. ; Denic, Stojan

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Cyprus, Nicosia, Cyprus

fYear

2010

fDate

3-5 March 2010

Firstpage

1

Lastpage

5

Abstract

The paper introduces an asymptotic series expansion for the mutual information of Multiple-Input Multiple-Output (MIMO) channels. For low signal to noise ratio (SNR) the first term of expansion approaches mutual information from below. Using the low SNR approximation a new water filling power allocation at the transmitter is derived when the receiver and the transmitter have perfect channel state information (CSITR). The low SNR approximation is related to existing approximation while the new water filling policy is related to minimum mean square decoding subject to power constraint. Finally, an upper bound for the outage probability at low SNR is presented.

Keywords

MIMO communication; channel capacity; decoding; probability; radio receivers; radio transmitters; MIMO channel; MIMO system capacity; asymptotic series expansion; channel state information; low SNR approximation; minimum mean square decoding; multiple-input multiple-output channel; mutual information; outage probability; receiver; signal-to-noise ratio; transmitter; water filling policy; water filling power allocation; Channel state information; Covariance matrix; Filling; MIMO; Mutual information; Receiving antennas; Signal to noise ratio; Transmitters; Transmitting antennas; Upper bound;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Control and Signal Processing (ISCCSP), 2010 4th International Symposium on

Conference_Location

Limassol

Print_ISBN

978-1-4244-6285-8

Type

conf

DOI

10.1109/ISCCSP.2010.5463456

Filename

5463456