| Independent of the multiple access schemes such as TDMA, FDMA, and CDMA, binary and quaternary coherent PSK (CPSK) and differentially coherent (DCPSK) systems are increasingly being used in wireless systems to transmit various types of digital traffic including voice, data, etc. Because of the growing demand for wireless communication throughout the world, and the emphasis on achieving the highest spectral efficiency for each band of the spectrum, CPSK is often preferred to DCPSK if coherent carrier can be recovered in a wireless environment with acceptable accuracy (partially coherent PSK). Since a substantial amount of degradation is contributed by multipath fading, cochannel interference (CCI), and intersymbol interference (ISI), and we almost always use some form of diversity to mitigate the effect contributed by these factors, we present a unified methodology to analyze the performance of both partially CPSK and DCPSK diversity systems when those factors are taken into account. We evaluate the detection loss suffered and the phase precision required for the carrier recovery for different SNR reliability levels and error rate values. For DCPSK systems, we also provide simple closed-form expressions, in term of a convergent infinite series of elementary functions, for the error rates of DBPSK and DQPSK over arbitrarily correlated EGC fading channels.; In this dissertation, we also studied, for the first time, the effects of both CCI and ISI on the performance of partially CPSK diversity systems. For the CCI analysis, we consider a generalized propagation model in where the desired and interfering signals allow to follow several fading distributions with different amounts of fading severity. The ISI problem is assessed through evaluating the performance of two-ray frequency-selective fading channels where the presence of the delayed ray cases ISI. For both studies, extensive analytical results are presented and several comparisons based on the interfering signals conditions are established. Throughout the thesis, generalized fading channels including Rayleigh, Rician, and Nakagami- m distributions are considered, and the analytical results are accompanied by using an efficient quasi-analytical simulation technique. |
