Diversity performance of Ricean MIMO channels


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


ITG Workshop on Smart Antennas, Munich, Germany, pp. 253-256, Mar. 2004

DOI: 10.1109/WSA.2004.1407677

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In this paper, we assess the impact of real-world propagation conditions on the maximum achievable diversity performance of communication over MIMO channels. This is done by studying the outage behavior of the single-input single-output (SISO) channel induced by the use of Orthogonal Space-Time Block Codes (OSTBCs). For Ricean fading MIMO channels we demonstrate the existence of an SNR-dependent critical rate, R_crit, below which signaling with zero outage is possible, and hence the fading channel behaves like an AWGN channel. For SISO channels, R_crit is always zero. In the MIMO case, R_crit is a simple function of the angle between the vectorized Ricean component of the channel and the subspace spanned by the vectorized Rayleigh fading component.


Ricean MIMO channels, diversity, outage, critical rate

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Copyright Notice: © 2004 R. U. Nabar, H. Bölcskei, and A. J. Paulraj.

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