Performance Analyses Of Dynamic Channel Allocation In TDD-CDMA Communication System

In recent years, with the rapid increase of the in-voice mobile communication business, people's sight has already been tamed to the business of the multimedia by present speech communication. The requisition on high speed data communication is more and more urgent. Effective requency in resource with limited use are a subject badly in need of solution at present.Dynamic Channel Allocation (DCA) in TDD-CDMA system is investigated. Timeslot allocation scheme is mainly focused on allocating the proportion of uplink and downlink timeslots according to service requests in a cell, in order to fulfill the service requests better. Considering the effect of the special cross timeslot interference of TDD systems, effort will be made to reduce the cross timeslot interference as much as possible, in order to increase the resource utilization.Dynamic Channel Assignment (DCA) has been a topic of intense research for over a decade. DCA allows for more effcient use of the available spectrum and eliminates the burden of costly frequency planning. Handset's power, on the other hand, is both a scarce resource at mobile stations and a capacity constraining factor in systems inherently limited by interference. This, in turn, has led to the development of a variety of Power Control (PC) schemes which try to minimize the amount of interference in the system and the power consumption at the mobiles, enhance system capacity and prolong the life of batteries. Despite the intense activity in both the DCA and the PC arenas, little has been done aimed at trying to effectively integrate them with base assignment, call admission control and handover control.In this thesis, a novel and advanced DCA algorithm is presented, which is based on the algorithm of average power value. Simulation results show this algorithm can work better to improve the system performance.