多業(yè)務(wù)CDMA系統(tǒng)中的前向功率預(yù)測
Prediction of forward transmit power in multiple services CDMA systems
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摘要: 在綜合語音、數(shù)據(jù)等多種業(yè)務(wù)的CDMA蜂窩移動通信系統(tǒng)中,由于請求接入的各業(yè)務(wù)的傳輸速率和服務(wù)質(zhì)量各不相同,小區(qū)基站的前向發(fā)射功率在接入業(yè)務(wù)后,變化的程度也各不相同,故為了保證系統(tǒng)的穩(wěn)定性,必須對系統(tǒng)的前向發(fā)射功率進行限制。該文提出了一種在多業(yè)務(wù)、多速率環(huán)境下,CDMA系統(tǒng)接入新業(yè)務(wù)后前向功率增量的預(yù)測方法;運用該方法預(yù)測了小區(qū)的前向發(fā)射功率,并與仿真結(jié)果進行了比較。
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關(guān)鍵詞:
- 碼分多址; 多業(yè)務(wù); 功率預(yù)測; 移動通信
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. -
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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