發(fā)布時(shí)間：2018-02-01 06:09

  本文關(guān)鍵詞： 寬帶衛(wèi)星通信 頻分復(fù)用 連續(xù)波時(shí)分復(fù)用 準(zhǔn)正交時(shí)分復(fù)用　出處：《西安交通大學(xué)學(xué)報(bào)》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：針對(duì)基于非再生式星上處理的大容量寬帶衛(wèi)星通信系統(tǒng)下行鏈路采用頻分復(fù)用(FDM)傳輸方式效率低、性能差的問(wèn)題,提出并論證了兩種特殊的連續(xù)波時(shí)分復(fù)用(CWTDM)方法——分幀交織疊接相加法(AFO)和準(zhǔn)正交時(shí)分復(fù)用(QOTDM)法。首先,兩種方法均先將待傳輸?shù)母髀坊鶐?fù)信號(hào)采樣量化;然后,AFO方法對(duì)量化信號(hào)進(jìn)行分幀疊接相加后加上幀頭構(gòu)成復(fù)用幀進(jìn)行下行傳輸,QOTDM方法采用樣點(diǎn)交織的時(shí)分復(fù)接再添加同步序列后轉(zhuǎn)化為連續(xù)信號(hào)進(jìn)行傳輸。AFO方法對(duì)信號(hào)復(fù)接、分接的處理簡(jiǎn)單;QOTDM方法復(fù)接時(shí)只需每路緩存一個(gè)樣點(diǎn),有利于實(shí)現(xiàn)更大容量的星上交換。與FDM下行傳輸方式相比,這兩種方法的功率效率更高、鏈路特性更好。仿真結(jié)果表明,相較FDM傳輸方式,QOTDM方法的256個(gè)載波下的信干比可提高10dB,子信道隔離度可達(dá)到實(shí)用要求。
[Abstract]:In order to solve the problem of low efficiency and poor performance in the downlink of large capacity broadband satellite communication system based on non-regenerative on-board processing, frequency division multiplexing (FDM) transmission mode is used. In this paper, two special CWTDMs are proposed and demonstrated, namely, framing interleaved overlapping addition (AFO) and quasi orthogonal time division multiplexing (QOTDM). The two methods first sample and quantize each baseband complex signal to be transmitted. Then, the AFO method overlaps the quantized signals and then adds a frame head to constitute a multiplexed frame for downlink transmission. The QOTDM method uses the time division multiplexing method of sample interleaving to add the synchronization sequence and then converts the signal into a continuous signal for transmission. The signal multiplexing method is simple and the demultiplexing process is simple. When the QOTDM method is multiplexed, only one sample is needed for each buffer, which is beneficial to the realization of larger on-board switching. Compared with the downlink transmission mode of FDM, the two methods have higher power efficiency. The simulation results show that the signal-to-interference ratio under 256 carriers can be improved by 10 dB compared with the 256 carriers of FDM transmission mode, and the subchannel isolation can meet the practical requirements.
【作者單位】： 西安電子科技大學(xué)綜合業(yè)務(wù)網(wǎng)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)電子系統(tǒng)工程公司研究所;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61301170) 中國(guó)空間技術(shù)研究院基金資助項(xiàng)目(0883383005)
【分類(lèi)號(hào)】：TN927.2
【正文快照】： 網(wǎng)絡(luò)出版地址:http:∥www.cnki.net/kcms/detail/61.1069.T.20170113.1018.002.html隨著全球信息化的高速發(fā)展,急劇增長(zhǎng)的市場(chǎng)需求迫使衛(wèi)星通信不斷朝著大容量、寬帶化的方向發(fā)展[1]。然而,對(duì)于大容量寬帶衛(wèi)星通信系統(tǒng)而言,若采用再生式星上處理(OBP),雖然能夠支持各種形式的，

本文編號(hào)：1481142