综合业务的CDMA系统在不同无线环境下的容量分析
CAPACITY OF CDMA FOR INTEGRATED TRAFFIC IN DIFFERENT WIRELESS ENVIRONMENT
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摘要: 个人通信和移动计算的发展促进了将综合业务引入移动通信中.CDMA系统是适合于传输综合业务的系统.本文首先给出了一种业务接入控制算法,并在此算法下,对综合业务的CDMA系统的容量做一简要分析,为满足不同业务的QoS(Quality of Service)要求,对于不同的业务在传输时给予不同的功率.为克服速率较高的业务需要较大功率的问题,对速率较高的业务给予较宽的传输带宽.不同的业务在同一频段中传输.最后,依据CODIT(COde DIvision Testbed)提供的测试数据,给出了不同业务在不同无线环境下的容量.
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关键词:
- 码分多址接入; 综合业务; 移动通信
Abstract: The developments of Personal Communication and Mobile Computing stimulate the introducation of integrated traffics into mobile communication. CDMA is suitable for transmission of integrated traffics. In this paper, we introduced an admission control algorithm. Under this algorithm, the capacity of a CDMA system for integrated traffics is evaluted. Users with different QoS requirements are allocated different power. To solve the problem of higher-rate traffics using higher powers, wider bandwidth to higher-rate traffics is given. All the traffics are transmitted in the same frequency band. Finally, according to the measured data of CODIT, we derived the capacity of different traffics in different environments. -
Baier A. Design study for a CDMA-based third-generation mobile radio system. IEEE J. of SAC, 1994, SAC-12(4): 733-744.[2]Chih-Lin I. Variable spreading gain CDMA with adaptive control for integrated traffic in wireless networks. Proc. VTC95, Chicago: July, 1995, 907-911.[3]Marta Pizarroso, et al. Common basic for evaluation of ATDMA and CODIT system concept. MPLA/TDE/SIGS/DS/P/001/bl Sep.1995.[4]Marta Pizarroso, et al. Prelimiary evaluation of ATDMA and CODIT system concept.[5]MPLA/TDE/SIG5/DS/P/002/bl Sep.1995. -
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