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

Abstract EN

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.