Optimized Selection Diversity for Rayleigh Fading Channels
Victor C. M. Leung · IRE Transactions on Communications Systems · 1982
This paper considers the choice of the number of diversity branches for minimizing the bit error rate of a selection diversity system using noncoherent binary frequency-shift keying modulation for transmission over a Rayleigh fading Gaussian channel. An exact expression for the optimum number of branches,L_{sel}^{\ast}, is given. The resulting probability of bit error decreases exponentially with the square root of the energy per bit.