ANTENNA DIVERSITY COMBINING AND FINITE-TAP DECISION-FEEDBACK EQUALIZATION FOR HIGH-SPEED DATA-TRANSMISSION

The next-generation wireless communication systems are expected to sup port high-speed data transmission, Associated with high transmission r ates, however, is the problem of multipath intersymbol interference (I SI) due to frequency selective fading, Decision feedback equalization (DFE) and antenna diversity combining are two practical techniques for combating multipath ISI, Through simulations we investigate the perfo rmance of diversity combining, together with DFE, under various number s of antenna branches and equalization taps, in a quasistationary freq uency-selective fading environment with allitive white Gaussian noise (AWGN) and cochannel interference (CCI), We consider joint optimizatio n combining and power selection diversity combining, We simulate the c ombiner, using quatenary phase shift keying (QPSK) modulation with up to four antenna branches. Our results show that using antenna diversit y and DFE with joint optimization combining provides performance impro vement with lower computational complexity, as compared to that of usi ng either DFE or diversity combining alone for combating ISI.