【作者】 赵玉杰；

【导师】 李道本；

【作者基本信息】 北京邮电大学 ， 信号与信息处理， 2013， 硕士

【摘要】 众所周知,对于通信系统而言,有效性和可靠性是我们所不断追求的两个重要指标,为了提高通信系统的有效性,我们可以采用复用多址技术,对于通信系统的可靠性,我们可以采用较可靠的信号检测译码算法。李道本提出的重叠复用思想,对现有的通信技术可以说是改革性的创新,重叠复用技术不仅有着较高的谱效率,同时在可靠性方面也是比较理想的。本论文主要是在前人的基础上对重叠移位思想的OVTDM和OVCDM技术以及应用做了进一步的研究。本文第一章主要介绍近几十年来移动通信系统的快速发展历程,以及目前的差错概率译码准则的发展历程。然后是本论文的内容安排。第二章内容主要介绍了李道本教授所提出的重叠复用思想的基本原理,以及OVTDM的基本原理,在此基础上介绍了OVTDM的功率谱密度和信道容量。然后对重叠复用技术在码域上的实现技术OVCDM做了详细的介绍,并对不同编码矩阵下的OVCDM的性能做了仿真比较,同时对级联结构的OVCDM方案做了初步的仿真。第三章内容主要介绍在OVCDM的基础上将编码域扩展到(+1,-1)有限域上,并设计了乘积结构的OVCDM (P-OVCDM)方案,对于P-OVCDM译码算法,我们分别设计了添加已知导频的译码算法,单方向的译码算法,双方向的译码算法,最大测度的译码算法,从仿真结果可以看出,各个算法之间均有其优劣势,并且这四种算法也只是基本的算法,对于其后续的算法设计可能还有较长的路要走。第四章内容首先介绍了Turbo码的基本原理,编码和译码方案,然后介绍了在OVTDM技术的基础上,设计的高频谱效率下的纯重叠时分复用技术P-OVTDM (Pure Overlapped Time Division Multiplexing)和移位的重叠时分复用技术S-OVTDM (Shift Overlapped Time Division Multiplexing)方案。与谱效率相同的调制技术相比,该系统的性能要优于前者,同时该系统又可以达到普通的调制技术所无法达到的高频谱效率,例如谱效率可以高达24比特／符号。另外本论文还借鉴了Turbo码的思想,设计了互相交织的Turbo结构的P-OVTDM和S-OVTDM系统。论文的第五章是对本论文所研究内容的一个总结以及对未来的展望。更多还原

【Abstract】 As we all know, the validity and reliability are two important indicators for the communication system, in order to improve the effectivenesswe, we can use multiple access technologies, and we can use signal detection and decoding algorithm to improve the reliability. The overlapping ideas is an innovation to the existing technologies, it not only has a higher spectrum efficiency, and also ideal in reliability. The papers do further research on OVTDM and OVCDM on the basis of previous.The first chapter introduces the development of the mobile communication system in recent decades, and the error probability decoding development. Then there is the arrangement of the paper.The second chapter introduces the basic principle of overlapping ideas proposed by the Professor Li, as well as OVTDM basic principles introduced the power spectral density and channel capacity. Detailed description then done on the performance of different coding matrix OVCDM and cascaded OVCDM.The third chapter design a product structure OVCDM (P-OVCDM) program, for the decoding algorithm, we design a known pilot decoding algorithm and a decoding algorithm for a single/two directions, and the maximum measure decoding algorithm. We can see the four algorithms has its own advantages and disadvantages from the simulation results, and there is a long way to go in the decoding algorithm.The Fourth chapter introduces the basic principles of Turbo codes, encoding and decoding program, and then introduced in the P-OVTDM and S-OVTDM, In addition, the paper also design Turbo-P-OVTDM and Turbo-S-OVTDM system.The fifth chapter are a summary of the content and the vision for the future.更多还原