In this thesis, we have analyzed the subcarrier fading characteristics of multicarrier modulation (MCM) schemes such as orthogonal frequency division multiplexing (OFDM) and multicarrier code division multiple access (MC-CDMA), under generalized frequency-selective fading conditions. We have also developed several approaches to simplify the analytical expressions of bit error rate (BER) performance, as well as to enhance the performance of OFDM and MC-CDMA systems with various equalization and combining schemes. A wide variety of frequency-selective fading channels containing different...