【作者】 姜仑；

【导师】 惠晓威；

【作者基本信息】 辽宁工程技术大学 ， 通信与信息系统， 2008， 硕士

【摘要】 TD-SCDMA移动通信系统是我国第一个拥有自主知识产权的国际电信标准,该系统使用了智能天线、联合检测和上行同步等先进的通信技术,使其在系统性能、容量和制造成本上都具有明显的优势,因而受到国内外的普遍关注。TD-SCDMA系统与FDD-CDMA相比,它既要考虑最大限度地提高系统资源利用率,又要协调好各种资源之间的相互关系,只有这样才能保证系统的整体性能达到最优状态。本文首先介绍了基于3G系统的智能天线技术,并且着重讨论了智能天线系统对SCDMA无线接入系统容量的影响。然后介绍了一种系统分析模型分别对无线传播模型、干扰模型等进行了假设,并详细推导和计算了在该模型下SCDMA无线接入系统的容量。同时为了表述智能天线系统的优越性,本文还计算了当基站使用其它天线系统时,系统容量的变化,并给出了比较结果。本文对现有的热点小区方案进行了分析,通过仿真验证了其在特定业务场景下的局限性,指出了交叉时隙干扰和资源单向受限的矛盾。根据现有文献,给出了如何在交叉时隙干扰和资源单向受限之间寻找理想平衡点的不等式条件。以此不等式为基础,介绍了一种改进的热点小区方案。另外,小区分区方案利用智能天线的定位功能,也可以有效地降低交叉时隙干扰的影响,在实际的TD-SCDMA系统组网时,可视具体情况,综合考虑采用合理可行的慢速DCA方案。为了适应多业务资源管理,本文在已有的DCA研究成果基础上,对移动边界策略的多业务算法做了介绍和分析。为了验证MB DCA方案的性能,本文分别对对称时隙模式下的FB DCA方案和MB DCA方案进行了计算机仿真。对这两种方案从语音业务阻塞率、数据包平均队列长度、数据业务掉包率和系统吞吐量等方面进行了比较分析。最后,重点研究了共享DCA方案和固定DCA方案各自的优缺点。在此基础上,提出了一种改进的共享DCA方案,根据方案流程进行了计算机仿真验证,并与完全共享DCA方案和移动边界方案进行对比分析,从语音业务阻塞率、数据业务掉包率和系统吞吐量等方面进行了比较。更多还原

【Abstract】 The TD-SCDMA Mobile Communication System as the first Chinese self-owned intellectual property rights International Telecom Standard; it adopts smart antenna, joint detection and synchronous CDMA and other advanced technologies, and solves various problems in the application of these technologies, giving the system higher performance and frequency utilization efficiency. It gains a universal attention in the international organization. Compared with FDD system, it needs a maximum enhancement of system resource utilization and also the harmonization of all kinds of resources during the allocation and management of these system radio resources. If you guarantee the system performance achieves the most condition.First, in this thesis, we introduce the Smart Antennas and mainly examine the performance enhancements that can be achieved by employing SA in 3G system. Then, we set up a system-analyzing model, which includes the propagation waste model and interference model. According to the models, we study the capacity of SCDMA system. The simulations and analytical results are reasonable. In the paper, we also discuss the performances by employing different antenna systems. The conclusion shows that the Smart Antennas at the base station can dramatically improve the system performance.The Hot-Cell DCA scheme is firstly analyzed and simulated, and the results show its limited performance under some special service scenarios. Based on this result, the conflict between cross timeslot interference and resource unilateral limit is indicated, and an inequation condition to find out the optimal balance point between cross timeslot interference and resource unilateral limit is discussed. According to this inequation, a new improved Hot-Cell scheme is presented, which has better performance over the existing schemes. The Cell-Division scheme using the function of localization of smart antennas, can effectively reduce the effect of cross timeslots interference. In practical TD-SCDMA system, a Slow DCA scheme should be adopted according to different factors.In order to adopt multi-service in TD-SCDMA system, in this paper, based on the existing DCA research results, we introduce and analyze on the Movable Boundary Scheme. To validate the performances of the MB DCA scheme, the FB DCA scheme and the MB DCA scheme are simulated by computer respectively. These schemes are compared in these aspects of the voice call blocking probability, the average queue length of data packet, the data packet dropping probability and the total channel rate. Finally, we research deeper into advantages and disadvantages of the CS DCA scheme and the FB DCA scheme respectively. On this basis, the paper proposes an improved-sharing DCA program, and according to the program process, we simulate the improved-sharing DCA program by computer. The scheme are compared with the CS DCA scheme and the FB DCA scheme in these aspects of the voice call blocking probability, the data packet dropping probability and the total channel rate.更多还原