Radio Resource Allocation Based On Mmse Multiuser Receiver

Future wireless communication systems trend to provide multi-services to mobile users.CDMA technique is adopted by the 3rd generation mobile communication systems due to its flexibility in supporting multi-services.How to keep QoS of heterogeneous services and utilize the scarce radio spectrum resources is challenging for 3rd generation mobile communication systemsIn this thesis we developed a radio resource allocation framework for wireless Code Division Access(CDMA) Networks that support multi-class traffic with different data rates and bit error rate requirements.We proposed a new resource allocation scheme using joint adaptive power control and MMSE multiuser receiver in multipath fading system. By dynamically assigning users appropriate transmit power,processing gain and receiver filter,the scheme can guarantee user's diverse quality of service(QoS)requirements and significantly improve quality and capacity of the system.We derived theory for abstraction of bandwidth resource and characterization of system capacity for multi-class fading system.Bandwidth resources allocated to a user can be abstracted as effective bandwidth,determined by the user's source data rate and target bit error rate.System capacity can be characterized by a theoretical bound.Simulations show that actual system capacity is close to the theoretical bound.We also proposed a new call admission control(CAC) scheme for CDMA cellular system that incorporates adaptive power control and MMSE multiuser receiver and support multi-class traffic.The call admission control scheme is based on estimation of othercell interference and implemented distributively in each cell.Capacity determined by the admission control agrees with the actual system capacity in the simulation.The scheme can achieve high bandwidth utilization and guarantee QoS requirements of all the users at the call level.