General specification for directed receivers used in the short - wave communication jamming 短波通信干擾引導(dǎo)接收機通用規(guī)范
This thesis is concerned with the file transfer protocol for short - wave communication system 本文闡述了一個短波通信系統(tǒng)及其上運行的文件傳輸協(xié)議的設(shè)計和開發(fā)。
Blind receiving technology is helpful for the improvement of stability and transmission efficiency in short - wave communication 盲接收技術(shù)有助于提高短波通信的有效性和魯棒性,還能提高數(shù)據(jù)傳輸效率。
As a important method for middle or long distance wireless communication , short - wave communication gains its recognition over again , for its long - distance and anti - destroy capability . but now more advance performances are expected 短波通信是中遠距離無線通信的一個重要方式,由于通信距離遠、抗打擊能力強、設(shè)備簡單等優(yōu)點在近年來重新受到重視。
Short - wave communication has been applied to the field of government , military affairs , diplomacy , weather , business and so on for many years . it used for transmittiing audio , words , video , data and other information 短波通信多年來被廣泛應(yīng)用于政府,軍事,外交,氣象,商業(yè)等領(lǐng)域,用以傳送語音,文字,圖像,數(shù)據(jù)等信息,尤其在軍事部門,它始終是軍事指揮的重要手段之一。
Especially in military affairs , it is the vital part in military operations . short - wave communication is attractive because only little power and proper expenditure is needed when it is used for long distance communication . for this valuable trait , many country have expanded the area of short - wave communication ’ s research , thus there has become more and more new - model communication system 短波通信之所以能吸引用戶用它傳遞信息,最基本的原因是由于進行遠距離通信時,僅需要不大的發(fā)射功率和適中的設(shè)備費用,這一寶貴的優(yōu)點,使得世界各國近年來加緊了短波通信的研究,出現(xiàn)了各種新型的短波通信系統(tǒng)。
When the short - wave communication system adopting this file transfer protocol works in half - duplex or full - duplex communication link , it has such virtue as high performance and high speed . compared to the case using wait - and - stop , the efficiency of the file transfer protocol using dynamic sliding window is head and shoulders above 并在實際應(yīng)用中把采用了動態(tài)滑動窗口的文件傳輸協(xié)議與采用了停等協(xié)議的文件傳輸協(xié)議的效率進行比較,前者的結(jié)果明顯地優(yōu)于后者。
Short - wave communication is the most important scheme in military communication . with the fast development of various new technology and new systems , such as dsp technology , micro processing technology , frequency - hopping technology , error correction technology , short - wave communication has already been widely applied in military communication , marine communication , board communication and so on 短波通信是現(xiàn)代軍事通信中最重要的通信手段,隨著隨著數(shù)字信號處理( dsp )技術(shù)、微處理技術(shù),自適應(yīng)技術(shù)、跳頻技術(shù),糾錯技術(shù),分集技術(shù)等各種新技術(shù)和新體制的飛速發(fā)展,短波通信已廣泛應(yīng)用在軍事通信、海上通信、機載通信等各方面。
This thesis adopts 8psk / qpsk modulation mode that ' s widely applied in short - wave communication to research all - digital blind receiver in burst mode based on software radio technology . then related solutions are given for the doppler frequency shift problem and multiple fading problem in short - wave channels . the arrangement of the thesis is below : chapter 1 gives brief description for the new technology and new systems of short - wave communication and for the development and appliance of software radio 本文采用短波通信中應(yīng)用廣泛的8psk qpsk調(diào)制方式,研究基于軟件無線電技術(shù)的突發(fā)模式全數(shù)字盲接收機,并對多音并行及慢速傳輸中存在的多譜勒大頻偏問題、單音串行、高速數(shù)傳時在短波通信鏈路中發(fā)生的干涉衰落問題做了研究,提出了相應(yīng)的解決方案。