On the Capacity of MIMO Weibull-Gamma Fading Channels in Low SNR Regime

We present capacity analysis for multiple-input multiple-output MIMO system under a low signal-to-noise ratio SNR regime. We have selected a composite fading channel that considers Weibull fading for multipath and gamma fading for shadowing. We have presented the analysis in a detailed form for three different techniques, namely, spatial multiplexing SM with optimal detection, SM with minimum mean square error MMSE detection, and orthogonal space-time block codes OSTBC. Because capacity analysis at arbitrary signal-to-noise SNR is stringent, a low SNR regime is considered to achieve a positive rate and wideband slope. The improvement is the result of minimizing energy per information bit Eb. For the first time, closed-form expressions are evaluated for the capacity of MIMO systems at low SNR under WG fading channels which facilitate the performance comparison for proposed techniques.

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