采用DFT實(shí)現(xiàn)時(shí)FD/SSMA系統(tǒng)的同步分析
ANALYSIS OF SYNCHRONIZATION IN THE FD/SSMA SYSTEM WITH DFT IMPLEMENTATION
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摘要: 本文分析FD/SSMA系統(tǒng)采用DFT實(shí)現(xiàn)時(shí)的同步原理。FD/SSMA系統(tǒng)的同步包括信息比特定時(shí)同步(即DFT的時(shí)間窗同步)及系統(tǒng)載波的同步。利用定時(shí)同步識(shí)別信號(hào)、定時(shí)同步誤差信號(hào)、載波頻率誤差信號(hào)及載波相位誤差信號(hào)可以依次完成FD/SSMA系統(tǒng)接收端定時(shí)同步的捕獲、鎖定及跟蹤,載波頻率及相位同步。在利用DFT實(shí)現(xiàn)的FD/SSMA系統(tǒng)中,由于實(shí)現(xiàn)同步的信號(hào)處理均可利用數(shù)字信號(hào)處理技術(shù)(DSP),從而使同步的實(shí)現(xiàn)更方便。
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關(guān)鍵詞:
- 直接序列擴(kuò)頻; 頻率分集擴(kuò)頻; 碼分多址; 離散傅立葉變換
Abstract: The principle of synchronization in FD/SSMA (Frequency Diversity/Spread Spectrum Multiple Access) system with DFT (Discrete Fourier Transform) implementation is studied. It is shown that both byte-timing synchronization (i.e. the time-window of DFT transform) and the transmitter carrier synchronization are needed in this FD/SSMA system. The capturing, locking and tracing of timing-synchronization, the carrier s synchronization about its frequency and phase will be finished in order by the recognizing signals of timing-synchronization and three error signals, of which the timing-error signal, the frequency and phase error signals of the system carrier are included, where their implementation may be carried out easier due to the DSP (Digital Signal Processing) techniques to be applied. -
曹葉文.多載波頻率分集擴(kuò)展頻譜碼分多址通信原理的研究:[博士學(xué)位論文]. 北京: 北京大學(xué),1995年7月.[2]曹葉文,項(xiàng)海格. 多載波頻率分集擴(kuò)展頻譜通信原理的研究.中國通信學(xué)會(huì)第四屆學(xué)術(shù)年會(huì)論文集.北京:機(jī)械工業(yè)出版社,1995年11月,585-589.[3]Cao Yewen, Xiang Haige. Analysis of antijamming performance of multicarrier frequency diver-[4]sity spread spectrum communication system. 1996 Int. Conf. on Communication Techonology (ICCT96), Beijing, China: IEEE Press., 1996, 595-598.[5]Cao Yewen, Xiang Haige. A frequency diversity spread spectrum multiple access system with random signature sequence. J. China Institute of Commun., 1995, 16(4): 56-62.[6]曹葉文,項(xiàng)海格.多載波頻率分集擴(kuò)展頻譜碼分多址通信的同步原理.通信學(xué)報(bào),1997, 18(1): 34-39.[7]Weinstein S B, Ebert P M. Data transmission by frequency multiplexing using discrete Fourier transform. IEEE Trans. on Comm. Techno., 1971, COM-19(10): 628-634. -
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