Spectral Efficiency Evaluation of Selection Combiner under Nakagami-m fading channels using different Adaptive Transmission Techniques-A Review

This paper focuses on the improvement of channel capacity for mitigation of fading. Generalized closed form expressions have been evaluated for spectral efficiency for Selection Combiner (SC) under Nakagami-m fading model. In particular, adaptive transmission techniques like Optimum rate adaptation with constant power (ORA) and Channel inversion with fixed rate (CIFR) have been considered. Evaluated expressions are then plotted for different values of fading parameter under both no diversity and dual diversity. This paper provides the comparative analysis for exact and approximate spectral efficiencies under Rayleigh and worst case fading condition.