X频段高速数传信号调制解调算法  

Modulation and demodulation algorithms for high-speed data transmission signals on X-band

作　　者：宋雨 高雅 王智斐 SONG Yu;GAO Ya;WANG Zhifei(63636 Troops,Lanzhou Gansu 732750,China)

机构地区：[1]63636部队,甘肃兰州732750

出　　处：《航天工程大学学报》2024年第3期68-71,共4页

摘　　要：结合信息获取类卫星X频段高速数传接收解调工作的实际,从理论和应用上研究数传信号调制解调算法。给出了成形正交相移键控(SQPSK)正交调制算法,设计了调制模型,生成了调制后的I、Q两路信号波形。研究了数传信号相干解调算法,设计了提取码元相位并进行抽样判决的功能。采用平方根升余弦滚降滤波器用于脉冲成形和低通滤波,构建了SQPSK高速数传信号调制解调系统,完成了算法仿真与误码率分析,仿真表明算法性能优良,解调误码率满足指标要求。Based on the practical work of information acquisition satellite X-band high-speed data transmission reception and demodulation,this paper studies the modulation and demodulation algorithms of data transmission signal from both theoretical and practical perspectives.The Shaped Quadrature Phase-shift Keying(SQPSK)orthogonal modulation algorithm is presented,and a modulation model is designed to generate the modulated I and Q signal waveform.The coherent demodulation algorithm for data transmission signals is studied and the function of extracting symbol phase and sampling decisions is designed.A square root raised cosine roll off filter is used for pulse shaping and low-pass filtering to construct an SQPSK data transmission signal modulation and demodulation system.The algorithm simulation and the bit error rate analysis are completed.The simulation results show that the algorithm performance is excellent and the demodulation bit error rate meets the requirements of the indicators.

关 键 词：高速数传 SQPSK 正交调制 相干解调 滤波 仿真 

分 类 号：TN927[电子电信—通信与信息系统] V243[电子电信—信息与通信工程]