- 學位論文
以協商功率控制來減少無線通訊系統阻塞率
Negotiating Power Control for Reducing Blocking Rates in 3G Wireless Communication Systems
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摘要
分碼多工存取(CDMA)技術為主的通訊系統中，干擾是一個影響效能的關鍵因素，而功率控制就是可以降低干擾的方法之一。在蜂巢式通訊系統中干擾的控制及系統容量上扮演著相當重要的角色。在3G系統中，可以有效的抵抗遠近效應的影響，同時減少多重存取的干擾，藉此大幅的提高系統的容量，同時提供較佳的連線品質。 此論文著重在上傳方向(uplink)的功率控制，以訊號對干擾的比率(SIR)及代理人協商機制為基礎，解決遠近問題、降低阻塞率及提高整個系統的容量。利用此方法於上傳方向的功率控制上，在協商的過程中，針對功率大小及資料傳輸率的問題，達到最佳的控制。 從模擬的結果來看，在相同的連線品質之下，與FER-based和Strength-based的方法比較，Negotiation-based的功率控制有較佳的效能表現。在高速傳輸模式下，系統總容量提昇約10%，而在低速傳輸模式下，系統總容量提昇約28%。
並列摘要
In Code Division Multiple Access (CDMA) systems, power control can effectively reduce near-far effect and multiple access interference to improve the system capacity and provide quality of service to individual users. In this thesis, we proposed a novel SIR-based agent negotiation power control mechanism an uplink to solve either the near-far, or reduce blocking rate and enhance the system capacity. The proposed mechanism can get the advantage using interaction between agents optimal negotiation. The simulation results show that, under the same quality of service, the negotiation-based power control has better performance than that of FER-based and Strength-based approach. Specifically, the system capacity with the proposed power control can be increased by 10% at higher data rate, and increased by 28% in lower data rate.
參考文獻
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