Postdetection switch-and-stay combining in Nakagami-m fading

In two recent papers, the performances of dual branch postdetection switch-and-stay combining (SSC) for noncoherent binary orthogonal frequency-shift keying (BFSK) and noncuherent M-ary orthogonal frequency-shift keying (MFSK) operating in the present of show that fading modeled by Rayleigh. Nakagami-m. and Rician distributions have been analyzed. This paper shows that the previous analyses of BFSK and MFSK with postdetection SSC in Nakagami-m fading, which was limited to integer values of m. are incorrect and we drive correct bit error rate performance results for BFSK and MFSK with dual-branch SSC in Nakagami-m fading for all values of m. Our analytical results are verified using extensive Monte Carlo simulations. It is shown that for a given bit error rate the performance gain of postdetection SSC over predetection SSC has been overestimated by several dBs in SNR in previous reported work.