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哈尔滨工程大学本科生毕业论文

基于MSP430的MSK调制解调实现

院 (系)：信通学院

专 业：电子信息工程

学 号学 生 姓 名：杜兆龙

指 导 教 师：罗天放 副教授

2008年6月

哈尔滨工程大学本科生毕业论文

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摘　　要

MSK是一种在无线通信中很有吸引力的数字调制方式，目前在短波、微波和卫星通信中均被采用。MSP430系列单片机是一种具有集成度高、功能丰富、功耗极低、内置乘法器等技术特点的16位单片机。这些特点使得MSP430系列非常适合于应用在移动通信系统中。

本文研究对象是恒定包络调制技术中的最小频移键控(MSK)它具有相位连续、频带利用率高的特点，在无线通信系统中得到广泛地应用。本文介绍了MSK的基本原理，深入分析了MSK调制解调方法。相关分析和结论都通过MATLAB进行了验证。接着根据MSK信号的特点以查表的方式对码元进行调制。该调制方案是通过调用相应码元的波形数据来形成MSK调制信号，其程序简单，计算量小。最后在IAR环境下，用C语言编写出了MSK的调制解调程序，在MSP430平台上实现了MSK的调制解调，并针对MSP430硬件的特点对C程序进行了一定的修改，提高了程序的运行速度。

关键词：调制；解调；MSK；MSP430

ABSTRACT

As one technique of digital communications MSK is very attractive in mobile communications environment. MSP430 is a kind of MCU which has the features of high integration feature-rich, low power consumption built-in multiplier and so on. These features make the MSP430 scales is very suitable for the mobile communications system.

In this paper, minimum frequency shift keying (MSK) is researched, which is a constant envelope modulation technology. It has the characteristic of continuous phase and high bandwidth utility. It is widely applied in the wireless communication system. The paper introduces the basic theory of MSK, and analysis deeply the modulation and demodulation methods for MSK. Related analysis and conclusions are verified by MATLAB. Then modulate symbols by the way of look-up table, according to the feature of MSK signal. The modulation scheme is by calling the waveform data of corresponding symbol to form MSK modulation signal, Its procedures simple, small amount of calculation. Finally under the IAR environment, compiled the MSK modulation demodulation procedure with the C language. Realizes the MSK modulation demodulation on the MSP430 platform, and make certain revision to the C procedure, according to the characteristics of the hardware for MSP430, raised the efficiency of procedure .

Key words: modulation; demodulator; MSK; MSP430

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