Characterizing the statistical properties of mutual information in MIMO channels: Insights into diversity-multiplexing tradeoff


Özgür Oyman, Rohit U. Nabar, Helmut Bölcskei, and Arogyaswami J. Paulraj


Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, Vol. 1, pp. 521-525, Nov. 2002.

DOI: 10.1109/ACSSC.2002.1197236

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We consider gaussian multiple-input multiple-output (MIMO) fading channels assuming that the channel is unknown at the transmitter and perfectly known at the receiver. Taking into account spatial fading correlation both at the transmitter and the receiver, we provide tight closed-form lower-bounds for ergodic capacity and derive extremely accurate closed-form approximations of the variance of mutual information over such channels. Based on these results, we investigate the impact of the number of antennas and transmit and receive correlation on ergodic capacity and on the variance of mutual information and draw insights into the tradeoff between diversity gain and spatial multiplexing gain.


MIMO, capacity bounds, diversity-multiplexing tradeoff

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