On Fair Scheduling Research For Multi-users Mimo Systems

Multiuser multiple-input multiple-output (MIMO) systems provide high capacity with the benefits of space division multiple access .The channel state information at the base station (BS) or access point (AP) is very important since it allows joint processing of all users'signals which results in a significant performance improvement and increased data rates.Transmission scheduling in wireless networks has drawn much research interests due to its attractive system capacity. With independent time-varying channels for different mobile users, transmission scheduling increases system throughput for delay-tolerant traffics by always picking those mobile users with better channels to transmit or receive. However, if user channels are different not only in instantaneous quality but also in average quality, there is always a tradeoff between system capacity and fairness when exploiting such multi-user diversity gains. As fairness criterion plays an important role in the performance balancing of system capacity and the achievable throughput of individual usersThis thesis is about evaluation of the performance of some fair scheduling schemes for multiuser in MIMO systems for the purpose to increase the capacity of the integration of wireless communication. Three scheduling method were chosen, beamforming method the precoding and broadcasting. The capacity of the system was evaluated with respect .Our approach for this thesis is to optimize the beamforming power also we will show the comparison with the proportional fair multibeam scheduling with three combining method as well as the performance of fair scheduling in multiuser the motive is also to propose a suitable scheduling method to have a better performance in capacity for wireless and MIMO system integration in general.