跳频传输模式下数字相位调制系统的研究

【作者】 吴瑾；

【导师】 金向东； 李式巨；

【作者基本信息】 浙江大学 ， 信号与信息处理， 2004， 硕士

【摘要】 近年来，跳频通信技术作为一种抗干扰、抗截获、抗检测的安全传输方式已广泛应用在各种军事无线通信领域。跳频传输模式下的数字相位调制系统具有较高的抗噪声性能，且能有效地利用频带，实现数据的高速传输，是一种比较优越的调制方式。本文根据跳频传输的特点，对MPSK和π／4-DQPSK这两种相位调制方式进行分析，提出数字调制解调方案，并用matlab对其进行了仿真，最后还在TI公司的TMS320C6416芯片上实现了这两种系统。 本文第一章介绍了跳频技术的特点、结构、发展现状和发展趋势，并进一步介绍了能够满足军事通信系统兼容性和扩展性要求的软件无线电技术。 第二章说明了跳频传输模式下数字相位调制系统的设计。首先介绍了跳频通信的信道特性，然后说明了跳频系统的工作情况，并分析了跳频传输对相位调制系统设计的影响，最后针对跳频通信的特点设计出跳频传输模式下的FH-MPSK和FH-π／4 DQPSK系统。 第三章主要讨论了跳频模式下FH-MPSK和FH-π／4 DQPSK系统中各个模块的设计，这些模块包括：上下变频器、奈奎斯特滤波器、信号到达检测、插值模块、通用环路、各环路误差提取方法、初始相位校正和TCM编译码。 第四章给出FH-MPSK和FH-π／4 DQPSK两系统的matlab仿真结果，说明用DSP实现这两个系统的软件开发流程，并在中频平台中实现了跳频8DPSK和π／4-DQPSK系统，给出实测结果。更多还原

【Abstract】 Recently, frequency-hop communication has been widely used in many military wireless communication domain as a secure transmission mode. In frequency-hop transmission, phase modulation system has good performance and high frequency efficiency. Phase modulation system is a superior system, can transmit data at high rate. In this thesis, digital FH - MPSK andFH-π/4DQPSK modulator and demodulator are given according to the frequency-hopcommunication characteristics. At last, we implement these systems in both hardware and software platform.Chapter 1 is an introduction to the frequency hopping, including its characteristics, structure, current technical situation and future tendency. In this chapter, software radio which has good compatibility and expansibility is introduced farther.Chapter 2 treats the design of digital phase modulation system in frequency hopping mode communication. At first, a description of channel characteristics is given for the latter design. Then, the frequency-hop system is presented. Emphasis is placed on the analysis of effect on the phase modulation system which is produced in frequency-hop transmission. At last, we scheme out theFH-MPSK and FH-π/4DQPSK systems according to the frequency-hop communication characteristics.Chapter 3 discusses the modules used in the FH-MPSK and FH-π/4DQPSKsystems. These modules include: DUC/DDC (Digital Up Converter / Digital Down Converter), Nyquist flitter, burst start detection, interpolation module, PLL (phase locked loop), PLL error extraction, initial phase correction and the coding and decoding for TCM.In chapter 4, the hardware and software implemented results are shown. We simulated the FH-MPSK and FH-π/4DQPSK systems by matlab, and implement them on a Texas Instruments chip TMS320C6416.更多还原