Next Generation wireless communication systems will support wireless multimedia and wireless internet access which require high data rate and complex designs. High data rate communication over wideband channels are significantly limited by Inter-Symbol Interference (ISI) due to frequency selective or time dispersive nature of the channels. Orthogonal Frequency Division Multiplexing (OFDM) has successfully prevented ISI in a frequency selective wireless environment. An interesting application of OFDM is in Multiuser OFDM systems in which multiple users share the same channel and the total transmit power. This paper 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.
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