Inspec keywords: Rayleigh channels; diversity reception; amplify and forward communication; cooperative communication; error statistics

Other keywords: opportunistic relay selection; moment generating function; diversity reception; MGF; outdated channel information impact; analytical expression; SNR; signal to noise ratio; BER performance; cooperative system; Rayleigh fading channels; M-ary modulation; bit error rate; amplify and forward communication

Subjects: Modulation and coding methods; Radio links and equipment; Other topics in statistics