In this study, approximate symbol error rate (SER)
expressions for M-ary phase shift keying (M-PSK) modulation
scheme over independent and identically distributed (i.i.d) slow-flat
Rician and Rayleigh fading channels are derived. Simulation
results show the superior impact of using the maximum ratio
combining (MRC) space diversity technique on the overall
performance. In particular, the communication reliability (i.e.,
capacity and coverage) will increase by increasing the diversity
order (i.e., the number of the combiner?s branches), where less
power is needed to achieve the same probability of error. Then, a
comparison between the approximate and exact probability of
symbol error is performed and the results are shown to be
comparable (1?2 dB). Next, approximate SER expression is
derived over i.i.d slow-flat Nakagami-m fading channels. In
particular, space time transmit diversity (STTD) technique is used
to enhance the reliability of the proposed model using two
transmit antennas and one receive antenna. The simulation
results show the effect of the Nakagami-m parameter, m, on the
SER where the performance will improve by increasing the value
of m where fading is less severe in this case. Furthermore, the
performance of the SER is lower for higher values of SNR and is
worse for high order PSK modulation schemes.