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This paper studies low-complexity power control schemes to approach the capacity limits of Multiple-Input Multiple-Output Orthogonal-Frequency-Division-Multiplexing (MIMO-OFDM) channels under the assumption that perfect Channel State Information (CSI) is available at both the transmitter and the receiver. Two notions of channel capacity limit are considered, namely, the ergodic capacity for variable-rate transmission of No-Delay-Constrained (NDC) traffic and the delay-limited capacity for constant-rate transmission of Delay-Constrained (DC) traffic. Let M be the minimum between the number of transmit and receive antennas and N the number of subcarriers, the authors propose a SubChannel Grouping (SCG) technique, which divides the total number of MN space-frequency MIMO-OFDM subchannels into M grouped channels, each exhibiting a different fading statistics.

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Format:PDFSize:584 KB
Date:Aug 2006
Pages:10

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