新一代移动通信系统中干扰与容量分析
发布时间：2018-09-09 08:20
【摘要】：移动互联网的快速发展导致对移动数据带宽的需求成倍增加，移动通信网络的容量面临前所未有的压力，促进了各种宽带无线通信技术的研究和应用。移动通信网络的容量不仅受限于网络频率和所采用的网络技术等因素，还受到网络干扰的影响，因此，在不增加额外资源的前提下，如何降低网络干扰，提高网络整体容量是本论文研究的重点。本文对新一代TD-SCDMA、多跳蜂窝系统及认知频谱共享中，典型交叉时隙复用及频率复用等网络内部干扰问题进行了研究。具体研究成果如下： 针对TD-SCDMA系统中交叉时隙干扰问题，本文首先分析交叉时隙对网络造成的干扰，并提出通过控制交叉时隙的覆盖范围，降低干扰的方法。该方法根据网络中交叉时隙的分布，动态地调整交叉时隙的覆盖半径，在不抬高系统内干扰水平的条件下，有效降低了交叉时隙干扰，提高了交叉时隙的利用率，提升了网络容量。 进而，分析TD-SCDMA网络中联合检测算法的同频干扰消除，重点评估和分析对联合检测算法在大规模商用网络中的实际应用效果，并与仿真结果进行了对比。评估结果表明，联合检测算法有效抑制了同频干扰，降低网络掉话率，具备在商用TD-SCDMA网络中全面应用的价值。 为在确保网络质量的条件下提高TD-SCDMA网络利用率，通过研究现网TD网络利用率与网络质量关系，分析利用率的网络质量拐点；通过在商用网络中进行业务加载压力测试，对网络的实际承载能力进行研究，从而确定网络利用率的极限值。 针对自组织网络与蜂窝网融合组成的多跳蜂窝系统，提出融合空分复用技术和智能天线技术的方法，有效控制系统内同频干扰，实现蜂窝系统和多跳节点共享无线资源。并通过采用合理的多跳节点间距和复用因子，有效地提高了多跳蜂窝系统容量。 在确保服务质量前提下提高频谱使用效用需要使用频谱共享技术。为了实现频谱的合理复用，基于非合作博弈论，设计了仅与认知用户的信干噪比门限和当前获得信干噪比相关，兼顾用户公平性的自适应效用函数，并在此基础上提出了一种功率控制模型，有效提高频谱共享的效用。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：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.
【学位授予单位】：西安电子科技大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.5
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