Study On Subscriber Scheduling And Radio Resource Management Stategy Of Relay MIMO System

With the development of wireless networks, network service can be providedeverywhere, which is convenient for people’s life. Especially wireless local area networksare widely used here and there. But there are many special characteristics for wirelessnetwork, which lend to the linking unstable, and the quality of service is influenced. Basedon the newest computer network technology and wireless communication trchnology,computer networks with wireless transferring media are called wireless local areanetworks. Wireless local area networks are extension of Local Area Network. The sendingand receiving process are implemented through wireless technology, then the connectingdemand decreased. This thesis, based on channel model of wireless networks, intelligentscheduling strategy of wireless network is studied. The main contents of this dissertationare outlined as follows:The system performamce of multiuser downlink MIMO（Multiple Input MultipleOutput） channel is studied. How to acquire information in sending and receiving processis studed, too. The obvious difference between open loop and close loop system is given.The high complexity of DPC coding approach has theoretical meaning. The precodingtechnology of downlink MIMO channel is addressed. The according multiuser schedulingis obtained.The MET is explored in multiuser downlink MIMO channel. The performance of theMET in linear precoding systems is the best and is almost the same as that of using dirtypaper coding system. The MET can simultaneously transmit several spatial multiplexingeigenmodes to multiple users which significantly enhance the system performamce.However, the maximum number of users that can be served simultaneously is limited dueto the constraints on the number of base station’s transmit antennas and the number ofuser’s receive antennas. The high complexity of the previously developed enumerativesearch algorithm impedes its application in practice. A recursive user selection algorithmwith low complexity is proposed in this chapter. Simulation results show that the proposed BD-MET algorithm based on the previously developed enumerative. The performance ofthe modified MET algorithm is better, but its complexity is not high.The fairness of the MET system is analyzed and is improved by using thecombination of the low complexity scheduling algorithm and the PFS algorithm and alsothe adaptive PFS algorithm. Simulation results show that the proposed adaptive PFSalgorithm provides a good system fairness performance while the high efficiency of thesysem is maintained.A novel radio resource management strategy based on cooperative communication isanalyzed via the two-state Markov model, which can allocate the idle resource via relaynodes to the subscribers who are out of service with effective radio resource utilization.The cooperative communication process of link layer is analyzed. Based on thecooperative communication, bandwith allocating scheduling is proposed. At last, thecooperative communication idea is applied in B3G systems. How to impove the existingwireless resource management scheduling from multi-address connecting and packetscheduling is discussed. A simulation example is given to test the verification of theresults. The supporting conditions for all kinds of operations of radio resourcemanagement based on cooperative communication are established. Under the ideal nodemodel, the radio recource allocation strategy of LTE nodes which utilize the cooperativescheme is given to improve the efficiency and fairness. Compared with the noncooperativesystem, the novel strategy improves the bandwith allocation efficiency and the throughputof the chain. Meanwhile it is capable of providing delay assurance for varied services withguaranteed QoS requirements.Finally, a summary has been done for all discussions in the dissertation. Future worksthat related to this work are also presented.