无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2013年
12期
17-20
,共4页
时间分集%对流层散射通信%频率分集%瑞利衰落
時間分集%對流層散射通信%頻率分集%瑞利衰落
시간분집%대류층산사통신%빈솔분집%서리쇠락
time diversity%troposcatter communication%frequency diversity%Rayleigh fading
针对对流层散射信号的时域衰落特点给出了一种适用于单天线、单发通道和单收通道轻便散射站的新型信号时间分集方法，即将待发送信息符号按等时间间隔多次延迟后重组为一个新的发送序列并共享带宽发出，在接收端对各冗余发送信息进行合并从而获得分集增益。分析了该体制的扩谱隐频率分集作用以及与各种前向纠错编码方法的兼容特性。实测结果表明，在平坦衰落与频率选择性衰落信道中信号的平滑能力均与传统的多天线空间分集体制相当。
針對對流層散射信號的時域衰落特點給齣瞭一種適用于單天線、單髮通道和單收通道輕便散射站的新型信號時間分集方法，即將待髮送信息符號按等時間間隔多次延遲後重組為一箇新的髮送序列併共享帶寬髮齣，在接收耑對各冗餘髮送信息進行閤併從而穫得分集增益。分析瞭該體製的擴譜隱頻率分集作用以及與各種前嚮糾錯編碼方法的兼容特性。實測結果錶明，在平坦衰落與頻率選擇性衰落信道中信號的平滑能力均與傳統的多天線空間分集體製相噹。
침대대류층산사신호적시역쇠락특점급출료일충괄용우단천선、단발통도화단수통도경편산사참적신형신호시간분집방법，즉장대발송신식부호안등시간간격다차연지후중조위일개신적발송서렬병공향대관발출，재접수단대각용여발송신식진행합병종이획득분집증익。분석료해체제적확보은빈솔분집작용이급여각충전향규착편마방법적겸용특성。실측결과표명，재평탄쇠락여빈솔선택성쇠락신도중신호적평활능력균여전통적다천선공간분집체제상당。
A novel time diversity method suited for the troposcatter communication system with only one antenna,one input and one output channel was provided according to its fading characteristics in the time domain,which was implemented by delaying the ini-tial symbol sequence in several intervals,re-assembling them into a new sequence,transmitting them in a sharing bandwidth way,and combining all the transmitted redundant information at the receiver to get the diversity gains. The implicit-diversity effect in frequency domain and the compatibility with various FEC codes were analyzed. Test result shows that it is equivalent to the conventional space di-versity scheme in order to smooth the deep fading signal either in the case of flat fading channel or frequency-selective fading channel.
