A Review on Channel Capacity Enhancement in Multiuser OFDM

Orthogonal Frequency Division Multiplexing (OFDM) has successfully prevented ISI in a frequency selective wireless environment. The growing demand on wireless communication service has created the necessity to support higher data rates for multimedia services. As next generation wireless communication networks are expected to provide broadband multimedia services such as voice, web browsing, video conferencing etc. For high data rate achievement one must enhance the capacity of the wireless communication system. The capacity of a communication system can be enhanced by using OFDM system. An interesting application of OFDM is in Multiuser OFDM systems in which multiple users share the same channel and the total transmit power. Due to independent multipath fading characteristic for each user, channel diversity is also created. This survey studies the methods that have been proposed in the literature to allocate the resources and achieve better Performances in data rates and Bit error rates and minimum transmit power levels. And also review on different channel capacity enhancement techniques used in OFDM system is SVD (Singular Value Decomposition), water filling algorithm.