RESOURCE ALLOCATION IN MULTIUSER MIMO- OFDM SYSTEMS

Abstract

The increasing demand for high-data rate wireless multimedia services due to the technology savvy people has led researchers developing great interest in the field of communication over a wireless channel, multiple antennas at both the transmitter and receiver side are employed to increase the data reliability or data rate, but the wireless channel limits the performance of the system with its frequency and time selective fading. To combat the situation, OFDM is used alongside MIMO resulting in a system robust to the frequency selective fading and simultaneously improving the performance of the system. Since OFDM can be used as both multi-access scheme and also modulation technique, the MIMO-OFDM system can be extended to multiuser MIMO-OFDM. MIMO-OFDMA or multiuser MIMO-OFDM is a system, where the subcarriers are allocated to multiple users dynamically, using the channel state information available. This system is considered a strong player for the next generation wireless communication network. The thesis considers various dynamic resource allocation schemes developed for the multiuser MIMO-OFDM system and the techniques to combat the co-channel interference for the users. Margin Adaptive scheme proposed in the literature is simulated for multiple antenna configurations and a Rate Adaptive resource allocation scheme based on this Margin Adaptive scheme is proposed and simulated for multiple antenna configurations and the results are compared with the capacity bound of the multiuser system.