Abstract: The wireless industry is currently undergoing a major transition from second generation to third generation wireless technologies and the increasing demands for communication services require higher transmission rates that further stimulates the demand on wideband technologies depicted in the form of Code Division Multiple Access (CDMA) on one hand. Also, as the privacy is a prime issue in modern communications then the carriers orthogonality is a fundamental concept for a sustainable development of the communications sector. This study attempts to assess wireless communications channels and propose techniques to improve the performance of modern wireless communications. Hence from a strategic perspective, an analytical study into the comparison of performance of Group Orthogonal Multi Carrier Code Division Multiple Access (GO-MC-CDMA) and multicarrier code division multiple access signal in frequency selective fading channel, the channel bandwidth is the main theme of this study; from which the problems that may affect the communications link are high lighted and measures to counterbalance and alleviate multi path fading are proposed and investigated. Such measures are: Space diversity combining techniques and interference cancellation and detection are considered in this study. As a result of a comparison between two schemes in this study it can be stipulated that sub carriers grouping does reduce Multi-User-Interference (MUI) between frequency groups thus enhance the performance of MC-CDMA system in the mission of meeting newly emerging wideband communications services, such as video conference add others.