多业务CDMA系统中的前向功率预测
Prediction of forward transmit power in multiple services CDMA systems
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摘要: 在综合语音、数据等多种业务的CDMA蜂窝移动通信系统中,由于请求接入的各业务的传输速率和服务质量各不相同,小区基站的前向发射功率在接入业务后,变化的程度也各不相同,故为了保证系统的稳定性,必须对系统的前向发射功率进行限制。该文提出了一种在多业务、多速率环境下,CDMA系统接入新业务后前向功率增量的预测方法;运用该方法预测了小区的前向发射功率,并与仿真结果进行了比较。Abstract: In a Code Division Multiple Access (CDMA) mobile communication system which supports integrated services, such as voice, data, and images, the variations of the forward transmit power of a base station after adding new connections are different for the services having different data rates and Quality of Service (QoS) requirements. Hence the forward transmit power must be constrained to preserve the system stability. This paper presents a method for forecasting the forward transmit power after adding a new connection of a predefined service type. The method is then exemplified by applying it to predict the forward transmit power in a typical system. The results are further validated by computer simulation.
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A.J. Viterbi, Principles of Spread Spectrum Communication, Reading, Massachusetts: Addision-Wesley Publishing Company, 1995, 173-188.[2]D.N. Knisely, S. Kumar, S. Laha, S. Nanda, Evolution of wireless data services: IS-95 to cdma2000, IEEE Comm. Magazine, 1998, 36(10), 140-149.[3]V.K. Garg, IS-95 CDMA and cdma2000: Cellular/PCS System Implementation, Qualcomm,1999. ［4］J. Lee, L. Miller, CDMA Systems Engineering Handbook, Boston: Artech House Publishers,1998. Chap. 2. ［5］T.S. Rappaport, Wireless Communications Principles Practice, Blacksburg, Virginia, Prentice Hall, Inc., 1996, 102-110. -
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