《電子技術(shù)應(yīng)用》
您所在的位置:首頁 > 通信與網(wǎng)絡(luò) > 設(shè)計(jì)應(yīng)用 > 衛(wèi)星信道群時(shí)延對(duì)高階調(diào)制信號(hào)接收影響的仿真分析
衛(wèi)星信道群時(shí)延對(duì)高階調(diào)制信號(hào)接收影響的仿真分析
電子技術(shù)應(yīng)用
唐婷
(中國西南電子技術(shù)研究所,四川 成都610036)
摘要: 針對(duì)信道群時(shí)延對(duì)高階調(diào)制信號(hào)的影響進(jìn)行仿真分析,給出了線性群時(shí)延、拋物線群時(shí)延模型下,8PSK、16APSK和16QAM接收系統(tǒng)信道群時(shí)延的設(shè)計(jì)指標(biāo)。同時(shí)針對(duì)群時(shí)延補(bǔ)償技術(shù),仿真了CAM與DD結(jié)合的均衡算法對(duì)信道群時(shí)延的補(bǔ)償效果,為后續(xù)工程設(shè)計(jì)提供參考。
中圖分類號(hào):TN76 文獻(xiàn)標(biāo)志碼:A DOI: 10.16157/j.issn.0258-7998.233744
中文引用格式: 唐婷. 衛(wèi)星信道群時(shí)延對(duì)高階調(diào)制信號(hào)接收影響的仿真分析[J]. 電子技術(shù)應(yīng)用,2023,49(9):133-137.
英文引用格式: Tang Ting. Simulation and analysis about satellite channel group delay influence for high-order signal receive[J]. Application of Electronic Technique,2023,49(9):133-137.
Simulation and analysis about satellite channel group delay influence for high-order signal receive
Tang Ting
(Southwest China Institute of Electronic Technology, Chengdu 610036, China)
Abstract: Simulation and analysis is given about channel group delay influence for high-order signal receives. In the condition of linear group delay and parabolic group delay, index is given about system group delay design with 8PSK,16APSK and 16QAM. For compensation technology of group delay, CMA and DD equalization algorithm is used, and result is given by simulation, which can be used to subsequent engineering design.
Key words : linear group delay;parabolic group delay;high order modulation;satellite channel

0 引言

未來通信衛(wèi)星將逐步發(fā)展為性能全面的大衛(wèi)星,在數(shù)據(jù)采集、導(dǎo)航、通信等方面實(shí)現(xiàn)高性能、高效率。為滿足高速數(shù)據(jù)傳輸需求,提升通信系統(tǒng)容量常用的技術(shù)手段包括提升信號(hào)帶寬、高階調(diào)制體制、極化復(fù)用技術(shù)等[1-3]。

隨著信號(hào)帶寬的提升,對(duì)傳輸信道帶寬提出更高要求。受模擬器件非理想特性影響,信道幅頻特性在信號(hào)帶寬內(nèi)呈曲線波動(dòng),且?guī)捲綄挘黝l點(diǎn)幅度不平坦度越大,相頻特性差異越大。信道幅度不平坦對(duì)信號(hào)接收影響相對(duì)較小,大量研究[4-9]集中在信道相頻特性對(duì)數(shù)傳信號(hào)的接收,群時(shí)延(Group Delay,DE)被來描述信道對(duì)信號(hào)不同分量頻率的延時(shí),當(dāng)信號(hào)不同頻率地經(jīng)過信道,產(chǎn)生不同時(shí)延,則會(huì)導(dǎo)致群時(shí)延畸變。

窄帶信號(hào)的接收中,影響數(shù)傳信號(hào)接收性能的主要因素是高斯白噪聲;寬帶數(shù)傳信號(hào)接收中,系統(tǒng)設(shè)計(jì)除了要對(duì)信噪比指標(biāo)進(jìn)行分配,同時(shí)也需要關(guān)注信道的群時(shí)延對(duì)接收性能的影響,尤其是寬帶高階調(diào)制信號(hào)的接收。文獻(xiàn)[7]采用全通濾波器模擬衛(wèi)星信道群時(shí)延,并對(duì)QPSK(Quadrature Phase Shift Keying)調(diào)制信號(hào)的接收進(jìn)行了仿真;文獻(xiàn)[8]針對(duì)高速數(shù)傳衛(wèi)星中繼系統(tǒng)的信道特性進(jìn)行分析,給出了傳輸QPSK 300 Mb/s數(shù)據(jù)的系統(tǒng)群時(shí)延設(shè)計(jì)指標(biāo)。文獻(xiàn)[9-11]分析了補(bǔ)償信號(hào)失真的均衡算法。

隨著衛(wèi)星技術(shù)的發(fā)展,8PSK(8 Phase Shift Keying)、16APSK(16 Amplitude Phase Shift Keying)、16QAM(16 Quadrature Amplitude Modulation)等高階調(diào)制信號(hào)逐漸被采用進(jìn)行數(shù)傳信號(hào)的傳輸,本文主要針對(duì)群時(shí)延對(duì)高階調(diào)制信號(hào)的影響進(jìn)行仿真分析,分析了在線性群時(shí)延拋物線群時(shí)延對(duì)高階調(diào)制信號(hào)接收的誤碼惡化和信噪比損耗;在此基礎(chǔ)上仿真了高速解調(diào)器內(nèi)部的均衡器對(duì)信道群時(shí)延均衡能力,本文采用常模算法(Constant Modulus Algorithm,CMA)與判決反饋(Direct Decision,DD)相結(jié)合的均衡算法,對(duì)信號(hào)群時(shí)延進(jìn)行補(bǔ)償。



本文詳細(xì)內(nèi)容請(qǐng)下載:http://ihrv.cn/resource/share/2000005651




作者信息:

唐婷

(中國西南電子技術(shù)研究所,四川 成都610036)


微信圖片_20210517164139.jpg

此內(nèi)容為AET網(wǎng)站原創(chuàng),未經(jīng)授權(quán)禁止轉(zhuǎn)載。