Multicarrier code division multiple access (MC-CDMA) system has received a considerable attention from researchers owing to its great potential in achieving high data rates transmission in wireless communications. Due to the detrimental effects of multipath fading the performance of the system degrades. Similarly, the impact of non-orthogonality of spreading codes can exist and cause interference. This paper addresses the performance of multicarrier code division multiple access system under the influence of frequency selective generalized k- fading channel and multiple access interference caused by other active users to the desired one. The average bit error rate is derived and expressed in Gauss hypergeometric functions. Maximal ratio combining diversity technique is utilized to alleviate the deleterious effect of multipath fading. © 2011 IEEE.