新一代移動通信系統(tǒng)中干擾與容量分析
發(fā)布時間：2018-09-09 08:20
【摘要】：移動互聯(lián)網的快速發(fā)展導致對移動數(shù)據(jù)帶寬的需求成倍增加，移動通信網絡的容量面臨前所未有的壓力，促進了各種寬帶無線通信技術的研究和應用。移動通信網絡的容量不僅受限于網絡頻率和所采用的網絡技術等因素，還受到網絡干擾的影響，因此，在不增加額外資源的前提下，如何降低網絡干擾，提高網絡整體容量是本論文研究的重點。本文對新一代TD-SCDMA、多跳蜂窩系統(tǒng)及認知頻譜共享中，典型交叉時隙復用及頻率復用等網絡內部干擾問題進行了研究。具體研究成果如下： 針對TD-SCDMA系統(tǒng)中交叉時隙干擾問題，本文首先分析交叉時隙對網絡造成的干擾，并提出通過控制交叉時隙的覆蓋范圍，降低干擾的方法。該方法根據(jù)網絡中交叉時隙的分布，動態(tài)地調整交叉時隙的覆蓋半徑，在不抬高系統(tǒng)內干擾水平的條件下，有效降低了交叉時隙干擾，提高了交叉時隙的利用率，提升了網絡容量。 進而，分析TD-SCDMA網絡中聯(lián)合檢測算法的同頻干擾消除，重點評估和分析對聯(lián)合檢測算法在大規(guī)模商用網絡中的實際應用效果，并與仿真結果進行了對比。評估結果表明，聯(lián)合檢測算法有效抑制了同頻干擾，降低網絡掉話率，具備在商用TD-SCDMA網絡中全面應用的價值。 為在確保網絡質量的條件下提高TD-SCDMA網絡利用率，通過研究現(xiàn)網TD網絡利用率與網絡質量關系，分析利用率的網絡質量拐點；通過在商用網絡中進行業(yè)務加載壓力測試，對網絡的實際承載能力進行研究，從而確定網絡利用率的極限值。 針對自組織網絡與蜂窩網融合組成的多跳蜂窩系統(tǒng)，提出融合空分復用技術和智能天線技術的方法，有效控制系統(tǒng)內同頻干擾，實現(xiàn)蜂窩系統(tǒng)和多跳節(jié)點共享無線資源。并通過采用合理的多跳節(jié)點間距和復用因子，有效地提高了多跳蜂窩系統(tǒng)容量。 在確保服務質量前提下提高頻譜使用效用需要使用頻譜共享技術。為了實現(xiàn)頻譜的合理復用，基于非合作博弈論，設計了僅與認知用戶的信干噪比門限和當前獲得信干噪比相關，兼顧用戶公平性的自適應效用函數(shù)，并在此基礎上提出了一種功率控制模型，有效提高頻譜共享的效用。
[Abstract]:With the rapid development of mobile Internet, the demand for mobile data bandwidth is increasing exponentially, and the capacity of mobile communication network is facing unprecedented pressure, which promotes the research and application of various broadband wireless communication technologies. The capacity of mobile communication network is not only limited by network frequency and network technology, but also affected by network interference. Improving the overall capacity of the network is the focus of this paper. In this paper, the problems of inter-network interference such as typical cross-slot multiplexing and frequency multiplexing in the new generation of TD-SCDMA, multi-hop cellular systems and cognitive spectrum sharing are studied. The specific research results are as follows: aiming at the problem of cross slot interference in TD-SCDMA system, this paper first analyzes the interference caused by cross time slot to the network, and puts forward a method to reduce the interference by controlling the coverage of cross time slot. According to the distribution of cross time slots in the network, this method dynamically adjusts the coverage radius of cross time slots, without raising the level of interference in the system, effectively reduces the cross slot interference and improves the utilization ratio of cross time slots. Increased network capacity. Furthermore, the co-frequency interference cancellation of the joint detection algorithm in TD-SCDMA network is analyzed. The practical application effect of the joint detection algorithm in large-scale commercial networks is evaluated and analyzed, and the results are compared with the simulation results. The evaluation results show that the joint detection algorithm can effectively suppress the same frequency interference and reduce the drop rate of the network. It has the value of full application in commercial TD-SCDMA networks. In order to improve the utilization ratio of TD-SCDMA network under the condition of ensuring network quality, this paper analyzes the inflection point of network quality by studying the relationship between TD network utilization ratio and network quality, and carries out the service loading stress test in commercial network. The actual carrying capacity of the network is studied to determine the limit of the network utilization ratio. For the multi-hop cellular system which is composed of self-organizing network and cellular network, a method of integrating space-division multiplexing technology and smart antenna technology is proposed to effectively control the co-frequency interference within the system and realize the sharing of wireless resources between the cellular system and multi-hop nodes. The capacity of multi-hop cellular system is improved effectively by adopting reasonable multi-hop node spacing and multiplexing factor. In order to ensure the quality of service, spectrum sharing technology is needed to improve the utility of spectrum utilization. In order to realize the rational multiplexing of spectrum, based on the non-cooperative game theory, an adaptive utility function is designed, which is only related to the threshold of the signal-to-noise ratio of the cognitive user and the currently obtained signal-to-noise ratio and takes into account the fairness of the user. On this basis, a power control model is proposed to effectively improve the utility of spectrum sharing.
【學位授予單位】：西安電子科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN929.5
本文編號：2231832
[Abstract]:With the rapid development of mobile Internet, the demand for mobile data bandwidth is increasing exponentially, and the capacity of mobile communication network is facing unprecedented pressure, which promotes the research and application of various broadband wireless communication technologies. The capacity of mobile communication network is not only limited by network frequency and network technology, but also affected by network interference. Improving the overall capacity of the network is the focus of this paper. In this paper, the problems of inter-network interference such as typical cross-slot multiplexing and frequency multiplexing in the new generation of TD-SCDMA, multi-hop cellular systems and cognitive spectrum sharing are studied. The specific research results are as follows: aiming at the problem of cross slot interference in TD-SCDMA system, this paper first analyzes the interference caused by cross time slot to the network, and puts forward a method to reduce the interference by controlling the coverage of cross time slot. According to the distribution of cross time slots in the network, this method dynamically adjusts the coverage radius of cross time slots, without raising the level of interference in the system, effectively reduces the cross slot interference and improves the utilization ratio of cross time slots. Increased network capacity. Furthermore, the co-frequency interference cancellation of the joint detection algorithm in TD-SCDMA network is analyzed. The practical application effect of the joint detection algorithm in large-scale commercial networks is evaluated and analyzed, and the results are compared with the simulation results. The evaluation results show that the joint detection algorithm can effectively suppress the same frequency interference and reduce the drop rate of the network. It has the value of full application in commercial TD-SCDMA networks. In order to improve the utilization ratio of TD-SCDMA network under the condition of ensuring network quality, this paper analyzes the inflection point of network quality by studying the relationship between TD network utilization ratio and network quality, and carries out the service loading stress test in commercial network. The actual carrying capacity of the network is studied to determine the limit of the network utilization ratio. For the multi-hop cellular system which is composed of self-organizing network and cellular network, a method of integrating space-division multiplexing technology and smart antenna technology is proposed to effectively control the co-frequency interference within the system and realize the sharing of wireless resources between the cellular system and multi-hop nodes. The capacity of multi-hop cellular system is improved effectively by adopting reasonable multi-hop node spacing and multiplexing factor. In order to ensure the quality of service, spectrum sharing technology is needed to improve the utility of spectrum utilization. In order to realize the rational multiplexing of spectrum, based on the non-cooperative game theory, an adaptive utility function is designed, which is only related to the threshold of the signal-to-noise ratio of the cognitive user and the currently obtained signal-to-noise ratio and takes into account the fairness of the user. On this basis, a power control model is proposed to effectively improve the utility of spectrum sharing.
【學位授予單位】：西安電子科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN929.5
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