基于箕舌线函数的变步长SOQPSK-TG盲均衡算法  

Variable Step-size SOQPSK-TG Blind Equalization Algorithm Based on Versoria Function

作　　者：张欢欢 王方刚 吴宸 贺勃翔 赖鹏辉 王岩 ZHANG Huanhuan;WANG Fanggang;WU Chen;HE Boxiang;LAI Penghui;WANG Yan(College of Electronic Information Engineering,Beijing Jiaotong University,Beijing 100044,China;College of Electronic Science,National University of Defense Technology,Changsha 410073,China;Beijing Aerospace Systems Engineering Institute,Beijing 100076,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]国防科技大学电子科学学院,湖南长沙410073 [3]北京宇航系统工程研究所,北京100076

出　　处：《无线电工程》2023年第11期2645-2651,共7页Radio Engineering

基　　金：国家自然科学基金高铁联合基金(62221001)。

摘　　要：针对部分响应成形偏移正交相移键控(Shaped Offset Quadrature Phase Shift Keying used in Telemetry Group,SOQPSK-TG)信号在“低仰角”遥测传输过程中存在的多径衰落问题,提出一种基于箕舌线函数的变步长盲均衡算法。该算法采用随机梯度方法迭代更新均衡器系数,通过箕舌线函数灵活控制迭代步长,解决了传统SOQPSK-TG信号盲均衡算法收敛速度慢、稳态误差大的问题。仿真结果表明,在滑行、起飞和远程飞行3种典型航空遥测场景中,所提算法能够对多径衰落信道下的SOQPSK-TG信号进行有效的均衡。相比已有算法,滑行场景下可以带来约0.5 dB的误码性能增益,起飞场景下可以带来约1 dB的误码性能增益,远程飞行场景下可以带来0.7~2 dB的误码性能增益,且该算法可以有效提升收敛速度、减小稳态误差。For the multipath fading problem of partial response Shaped Offset Quadrature Phase Shift Keying used in Telemetry Group(SOQPSK-TG)signal in the“low elevation”telemetry transmission process,a variable step-size blind equalization algorithm based on the versoria function is proposed.The algorithm uses the random gradient method to iteratively update the equalizer coefficients,and flexibly control the iteration step size through the versoria function,which solves the problems of slow convergence speed and large steady-state error of the traditional SOQPSK-TG blind equalization algorithm.The simulation results show that the proposed algorithm can effectively equalize the SOQPSK-TG signal in multipath fading channels in three typical aeronautical telemetry scenarios:taxiing,taking-off and far-flight.Compared with the existing algorithms,the proposed algorithm can bring about 0.5 dB bit error performance gain in the taxiing scenario,about 1 dB bit error performance gain in the take-off scenario,and 0.7~2 dB bit error performance gain in the far-flight scenario.The algorithm can also effectively improve the convergence speed and reduce the steady-state error.

关 键 词：航空遥测 多径信道 盲均衡 成形偏移正交相移键控 箕舌线函数 

分 类 号：TN92[电子电信—通信与信息系统]