TY - GEN
T1 - On the role of the input power constraint in the beamforming optimality range in TIMO channels
AU - Al-Ahmadi, Saad
AU - Yanikomeroglu, Halim
PY - 2009
Y1 - 2009
N2 - In this paper, the effect of the input power constraint on the beamforming optimality range in Gaussian two-input multiple-output (TIMO) channels is explored. The obtained results, using standard Lagrangian formulation, determine explicitly the range of the input SNR for which rank-1 signaling (beamforming) is optimal in TIMO channels for both the common power constraint and the individual power constraint cases. Moreover, the obtained results are extended to random TIMO channels, with channel state information at the receiver only, using the Jensen's upper bound on the mutual information.
AB - In this paper, the effect of the input power constraint on the beamforming optimality range in Gaussian two-input multiple-output (TIMO) channels is explored. The obtained results, using standard Lagrangian formulation, determine explicitly the range of the input SNR for which rank-1 signaling (beamforming) is optimal in TIMO channels for both the common power constraint and the individual power constraint cases. Moreover, the obtained results are extended to random TIMO channels, with channel state information at the receiver only, using the Jensen's upper bound on the mutual information.
KW - Beamforming
KW - Common power constraint
KW - Individual power constraints
KW - Input covariance matrix
KW - MIMO channels
KW - Mutual information
UR - http://www.scopus.com/inward/record.url?scp=70349902855&partnerID=8YFLogxK
U2 - 10.1109/CWIT.2009.5069521
DO - 10.1109/CWIT.2009.5069521
M3 - Conference contribution
AN - SCOPUS:70349902855
SN - 9781424434015
T3 - 2009 11th Canadian Workshop on Information Theory, CWIT 2009
SP - 59
EP - 62
BT - 2009 11th Canadian Workshop on Information Theory, CWIT 2009
ER -