Performance Evaluation of DS/CDMA Communications Systems Modulated with π/2-Shift BPSK over Multipath Rayleigh Fading Channels
M.M.Asadullah Galib, Takaya Yamazato, Masaaki Katayama, Akira Ogawa · Institutional Repositories DataBase (IRDB) · 1998
In mobile communications, power is a very important factor and nonlinear amplification of power amplifiers cannot be avoided due to their high power efficiency. This article presents the performance of π/2-shift BPSK modulation scheme used in DS/SS/CDMA wireless communications over multipath Rayleigh fading channel and compares the performance with the performance of conventional BPSK CDMA systems. The performance parameters : Out-of-Band power, average Bit Error Rate(BER) and Spectral Efficiency have been evaluated. In order to obtain improved performance on fading channels, a RAKE receiver has been employed. Finally it is shown that π/2-shiftBPSK outperforms conventional BPSK in the presence of nonlinear amplification.