On achievable performance over spatial diversity fading channels

Spatial diversity on the transmitter or the receiver side has been traditionally used to combat multipath fading. Recent results indicate significant gains in using multiple transmitter and receiver antenna diversities. By deriving the mutual information and cut-off rate we characterize the gains on these channels. We show that gains linear in the number of antennas can be achieved either when the SNR or the number of antennas becomes large.