论文编号:TX167 附开题报告,任务书,及前期过程^论文,论文字数:21006,页数:38 

  摘要
在通信技术迅猛发展的今天，通信系统的抗干扰技术已经成为通信研究的一项重要内容。通过对各种通信系统抗干扰技术的研究分析，变换域通信系统具有更高的抗窄带干扰性能，分析和研究了变换域通信系统中基函数生成的主要算法。针对AR谱估计存在虚假谱峰和谱线分裂的问题，结合变换域抗干扰技术，提出了一种改进的自适应多门限算法，并将其应用于变换域通信系统中。该算法在频域对检测信号进行归一化处理使得干扰检测门限不受检测信号功率影响，能更有效地估计干扰信号。同时，进行了基于Matlab的变换域通信系统（DTCS）仿真。仿真结果表明，基于新算法的TDCS具有良好的窄带干扰抑制能力，与原始算法比较，大大降低了系统误码率，具有更强的抗干扰能力和更好的自适应性。

关键词   变换域通信系统  自适应多门限  窄带干扰抑制  Matlab仿真  

Title   Anti-interterence  Techniques  in Communication  System                                     
                                                         

Abstract
Today, the communication technology is developed rapidly and the research of anti-interference technology  has already become an important content in communication.Through research and analysis to the various anti-interference technology in  communications systems, transform domain communication systems (TDCS) has higher anti-interference performance, analyze and research the principal algorithms about basis function generation.Beeause AR estimation can bring to false spectrum peaks and fission of spectrum regions，a new algorithm based on adaptive multi-threshold is proposed and applied to TDCS.Utilizing the new algorithm threshold can be generated without the influence of interferenee’s power ,therefor estimate interference signal more effectively.At the same time,the simulation to transform domain communication system(TDCS) is carried out based on the Matlab . The simulation results show that the TDCS based on a new algorithm has a good ability to narrow-band interference suppression, compared with the original algorithm, the system greatly reduce the bit error rate, have a stronger anti-interference capability and stronger adaptability.

Keywords  transform domain communication system  adaptive multi-threshold   narrowband interference  Matlab Simulation

目   录

1  绪论 ………………………………………………………………………………………1
1.1选题背景及意义………………………………………………………………1
1.2 课题主要研究内容………………………………………………………………1
2  通信抗干扰技术……………………………………………………………………2
2.1扩展频谱抗干扰技术……………………………………………………………………2
2.2 非扩频类的通信抗干扰技术……………………………………………………………4
2.3 通信抗干扰技术分析与方案选择………………………………………………………5
3  变换域通信系统中抗窄带干扰技术研究………………………………………………7
3.1 变换域通信系统（TDCS）基本原理………………………………………………7
3.2 影响TDCS性能的主要因素……………………………………………………………11
3.3 变换域通信系统（TDCS）中的抗窄带干扰技术………………………………………12
3.4变换域通信系统（TDCS）应用分析……………………………………………………16
4  变换域通信系统抗干扰设计与实现……………………………………………17
4.1 AR谱估计的基函数生成算法……………………………………………………17
4.2基于门限检测的基函数生成算法……………………………………………………23
4.3 改进自适应多门限算法……………………………………………………………25
4.4基于Matlab的变换域通信系统（DTCS）仿真分析…………………………………28
结论 …………………………………………………………………………………………31
致谢 …………………………………………………………………………………………32
参考文献……………………………………………………………………………………33

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