【作者】 蒋涛；

【导师】 王向阳；

【作者基本信息】 东南大学 ， 电子与通信工程， 2015， 硕士

【摘要】 随着移动通信技术的飞速发展,人们越来越期望获得更高速度的通信服务。与此同时,国家正式提出三网融合战略,将现有的广播电视网、计算机互联网及电信网相互融合。下一代广播电视无线网(Next Generation Broadcasting-Wireless, NGB-W)即在此背景下被提出,以实现具有双向交互功能的无线广播电视网。分布式MIMO多天线技术是蜂窝移动通信系统中解决频谱资源有限问题的有效方法。本文主要对基于分布式天线的NGB-W系统关键技术进行了研究。首先,本文综述研究了蜂窝移动通信系统中分布式MIMO多天线技术,预编码技术,多媒体广播多播业务(Multimedia Broadcast Multicast Service, MBMS)和协作多点通信等关键技术,并且对大区制与小区制层叠的NGB-W系统网络架构进行了分析研究。其次,本文研究了基于分布式天线的下一代广播电视无线网系统架构。NGB-W系统中,每个小区将覆盖有大量分布式天线。本文在对分布式MIMO信道建模的基础上,分析比较了分布式与集中式MIMO多天线系统中下行链路的天线发射功率。计算机仿真结果表明,分布式多天线系统的容量性能和覆盖性能更能满足NGB-W系统的要求。然后,本文研究了基于分布式多天线系统的下一代广播电视无线网络中的下行链路多用户预编码技术。本文在仿真研究传统块对角化和最大化信漏噪比预编码算法的基础上,针对其缺点提出了基于信漏噪比准则的矢量预编码算法和加权预编码算法。仿真结果表明,改进算法的平均误符号率性能和容量性能较传统算法得到提高。最后,本文基于分布式多天线系统,针对下一代广播电视无线网络中多用户多播业务场景,提出了一种低复杂度的分组预编码算法。仿真结果表明,算法在保证误码率性能的同时,有效地降低了运算的复杂度,节约了系统资源。更多还原

【Abstract】 With the swift development of mobile communication technology, people expect to obtain communication services more rapidly. At the same time, the nation proposed a strategy officially to integrate the existing Internet, broadcast network and telecommunications network into a unified network. The next generation broadcast wireless network (NGB-W) is raised under this context to realize a wireless broadcast network which process bidirectional communication function. And distributed MIMO multiple antennas system has been employed to copy with the challenge of scarce spectrum resources in cellular mobile communication system. The key technologies of NGB-W system based on distributed antennas are studied in this thesis.Firstly, the fundamental principles of distributed MIMO multiple antennas, pre-coding, multimedia broadcast multicast service (MBMS) and coordinated multi-point in cellular mobile communication system are summarized. The novel network architecture of NGB-W system which is combined of the large cell and small cells is also researched.Secondly, the architecture of NGB-W system based on distributed antennas is analyzed. A large number of distributed antennas are used in each small cells in NGB-W system. The distributed MIMO channel modeling is studied, and the antenna transmitting power of downlink in distributed and centralized MIMO antenna system is researched. The computer simulation result shows that the property of average capacity and coverage of distributed antennas system can meet the requirements of NGB-W system.Thirdly, the downlink multi-uesr pre-coding technology of NGB-W system based on distributed antennas is analyzed. The traditional block diagonalization and maximum signal-to-leakage-and-noise ratio pre-coding schemes are investigated through simulation. Then vector perturbation and weighted pre-coding schemes based on the signal-to-leakage-and-noise ratio criterion are proposed to modify the drawbacks of the traditional pre-coding scheme. The simulation results show that the proposed schemes improve the system’s average symbol error rate and capacity performance.Finally, a group pre-coding scheme for multi-user multicast scenario in NGB-W network with low complexity is proposed based on distributed multiple antennas system. The simulation results show that the proposed scheme achieves satisfactory average symbol error rate performance with lower computational complexity and fewer resources.更多还原