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High-SNR power offset in multiantenna communication
Lozano Solsona, Àngel; Tulino, Antonia M.; Verdú, Sergio
Universitat Pompeu Fabra
The analysis of the multiantenna capacity in the high-SNR regime has hitherto focused on the high-SNR slope (or maximum multiplexing gain), which quantifies the multiplicative increase as function of the number of antennas. This traditional characterization is unable to assess the impact of prominent channel features since, for a majority of channels, the slope equals the minimum of the number of transmit and receive antennas. Furthermore, a characterization based solely on the slope captures only the scaling but it has no notion of the power required for a certain capacity. This paper advocates a more refined characterization whereby, as function of SNRjdB, the high-SNR capacity is expanded as an affine function where the impact of channel features such as antenna correlation, unfaded components, etc, resides in the zero-order term or power offset. The power offset, for which we find insightful closed-form expressions, is shown to play a chief role for SNR levels of practical interest.
Ràdio -- Antenes
Tractament del senyal
Ràdio -- Interferències
Channel capacity
Multiantenna arrays
High-SNR analysis
Fading channels
Antenna correlation
Ricean channels
Coherent communication
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Institute of Electrical and Electronics Engineers (IEEE)

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