基于DSP的短波通信系統(tǒng)設計-同步技術
2萬字 27頁


摘要
本論文介紹了基于DSP的短波通信以及短波通信系統(tǒng)應用的一種重要技術——同步技術。概述了非相干解調(diào)的數(shù)字短波通信系統(tǒng)同步器部分所采用的位同步和群同步技術。最后展望了基于DSP的短波通信的發(fā)展前景。
極低信噪比條件下的短波通信是一種應急通信，本論文較詳盡地介紹了極低信噪比條件下的話帶低速率的短波同步器的設計原理以及其采用的關鍵技術：同步技術、短波通信技術、DSP技術、分集接收技術以及數(shù)字解調(diào)技術，并且給出了用DSP設計該短波同步器的硬件結(jié)構(gòu)和軟件實現(xiàn)。大量的實驗數(shù)據(jù)表明,本論文設計的同步器在極低信噪比的條件下能夠良好地工作。

關鍵詞：短波通信，數(shù)字信號處理，同步,分集接收



ABSTRACT
This paper introduced according to the DSP short-wave correspondence and an important technique of the short-wave correspondences--synchronous technique.Said all not concern with the numerical short-wave that solution adjust correspondence system synchronous that the machine part adopt synchronous and cluster synchronous technique.Prospected finally according to the development foreground of the DSP short-wave correspondence.
Very low rate of the power of signal and noise under condition of short-wave correspondence is a kind of to meet an emergency the correspondence, this paper compared to introduce the very low rate of the power of signal and noise in details than under condition of words take the short-wave of the low speed rate design principle of the synchronous machine and the key technique that it adopt:the synchronous technique, short-wave corresponds by letter the technique, technique of DSP and divides to gather to receive the technique and numerals solution to adjust the technique, and give design that short-wave with the DSP synchronous the hardware structure and softwares of the machine realization.A great deal of experiment data express, the synchronous machine of this paper design under the condition of very low rate of the power of signal and noise can work goodly.

Keywords:short-wave communication,DSP, synchronous，the cent gathers to receive


目錄
1緒論………………………………………………………………………………1
1.1 論文背景……………………………………………………………………1
1.2 論文目的……………………………………………………………………1
2基于DSP的短波通信……………………………………………………………2
2.1 短波通信的發(fā)展……………………………………………………………2
2.2短波通信的工作原理及特點………………………………………………4
2.3 DSP簡介……………………………………………………………………6
2.4 DSP技術在通信中的應用…………………………………………………8
2.5 基于DSP的短波通信的發(fā)展………………………………………………8
3同步技術………………………………………………………………………10
3.1同步的概念及方式………………………………………………………10
3.2同步的方法………………………………………………………………10
4基于DSP的短波同步器的設計………………………………………………15
4.1設計任務…………………………………………………………………15
4.2數(shù)字信號處理的優(yōu)勢……………………………………………………15
4.3同步器的設計實現(xiàn)………………………………………………………16
4.3.1同步方式的選擇……………………………………………………16
4.3.2 總體設計……………………………………………………………17
4.3.3 具體設計……………………………………………………………18
4.4 同步器的DSP實現(xiàn)………………………………………………………20
4.4.1芯片的選擇…………………………………………………………20
4.4.2數(shù)據(jù)收發(fā)與同步提取………………………………………………20
4.5 分集接收 ………………………………………………………………24
5總結(jié)……………………………………………………………………………25
參考文獻………………………………………………………………………26
致謝……………………………………………………………………………27


參考文獻
[1] 沈琪琪,朱德生.短波通信[M]. 西安: 西安電子科技大學出版社
[2] 張立材，王民．DSP應用系統(tǒng)的設計[Design]．西安：西安建筑科技大學出版