TY - GEN
T1 - On the optimality of channel inversion with diversity
AU - Zhang, Yuan
AU - Tepedelenlioglu, Cihan
PY - 2010/12/1
Y1 - 2010/12/1
N2 - Asymptotic comparisons of ergodic channel capacity at high SNR are provided for optimal power and rate adaptation and channel inversion over fading channels with general distributions, as well as the capacity of the equivalent AWGN channel. We present closed-form expressions for the high-SNR capacity difference gaps among these capacities. Based on these expressions it is shown that the presence of space diversity or multi-user diversity make channel inversion arbitrarily close to achieving optimal capacity at high SNR with sufficiently large number of antennas or users. In addition, for the case of low SNR, it is shown that a variant of channel inversion can be made close to the optimal scheme, and provide better capacity under fading than the equivalent AWGN channel. Numerical results are shown to corroborate our analytical results.
AB - Asymptotic comparisons of ergodic channel capacity at high SNR are provided for optimal power and rate adaptation and channel inversion over fading channels with general distributions, as well as the capacity of the equivalent AWGN channel. We present closed-form expressions for the high-SNR capacity difference gaps among these capacities. Based on these expressions it is shown that the presence of space diversity or multi-user diversity make channel inversion arbitrarily close to achieving optimal capacity at high SNR with sufficiently large number of antennas or users. In addition, for the case of low SNR, it is shown that a variant of channel inversion can be made close to the optimal scheme, and provide better capacity under fading than the equivalent AWGN channel. Numerical results are shown to corroborate our analytical results.
UR - http://www.scopus.com/inward/record.url?scp=79957984631&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79957984631&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2010.5757909
DO - 10.1109/ACSSC.2010.5757909
M3 - Conference contribution
AN - SCOPUS:79957984631
SN - 9781424497218
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 2055
EP - 2059
BT - Conference Record of the 44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
T2 - 44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
Y2 - 7 November 2010 through 10 November 2010
ER -