Title :
Analysis of multiple antenna wireless links at low SNR
Author :
Chaitanya Rao ; Hassibi, Babak
Author_Institution :
Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA
fDate :
29 June-4 July 2003
Abstract :
In the low signal-to-noise (SNR) regime when the channel is not known to both transmitter and receiver, we show that the capacity of a multiple antenna Rayleigh fading link is asymptotically quadratic in the SNR for all practical input distributions. This is much less than the known channel case where it exhibits a linear growth in the SNR. Under various signaling constraints we show that mutual information is maximized by using a single transmit antenna. Also sending training symbols offers no advantage at low SNR.
Keywords :
Rayleigh channels; antenna arrays; matrix algebra; receiving antennas; transmitting antennas; Rayleigh fading link; multiple antenna capacity; single transmit antenna; Antennas and propagation; Coherence; Fading; Gaussian noise; Mutual information; Rayleigh channels; Receiving antennas; Signal to noise ratio; Transmitters; Transmitting antennas;
Conference_Titel :
Information Theory, 2003. Proceedings. IEEE International Symposium on
Print_ISBN :
0-7803-7728-1
DOI :
10.1109/ISIT.2003.1228485
