PCSS-SC下基于并行导频序列的一种主动式RAKE接收技术  

Active RAKE receiving technology based on parallel pilot sequences in PCSS-SC

作　　者：陈浩 韩红柱 程疆博 张望泉 CHEN Hao;HAN Hongzhu;CHENG Jiangbo;ZHANG Wangquan(Unit 93448 of PLA,Tianjin 300270,China)

机构地区：[1]中国人民解放军93448部队,天津300270

出　　处：《现代电子技术》2024年第21期28-33,共6页Modern Electronics Technique

摘　　要：为解决并行组合扩频散射传输系统信道中存在的严重多径衰落效应,提出一种基于并行导频序列的主动式RAKE接收技术。该技术利用扩频序列PN的自相关特性,添加额外并行扩频序列作为收发已知的导频信号,设计适用在并行组合扩频散射通信的系统模型,并提出该模型下的多径搜索和时延估计方法,利用散射信道相干时间减少导频序列占比。通过仿真对比分析,在SNR=-8 dB时,信号识别概率能达到90%以上,低信噪比范围内,相比无抗多径技术可以提升60%左右的正确识别概率;区分充分多径和不充分多径进行系统误码率性能仿真分析,在SNR>-2 dB的区间内,相比无抗多径技术误码率大小均降低了三个数量级以上。结果说明文中技术能有效地对抗系统存在的多径衰落,保持较好的工作性能,保证数据稳定传输。An active RAKE receiving technology based on parallel pilot sequences is proposed to eliminate the severe multipath fading effect existing in the channel of the parallel combined spread spectrum scattering transmission system.In this technology,the autocorrelation characteristic of the spread spectrum sequence PN is utilized to add additional parallel spread spectrum sequences as the known pilot signals for transmission and reception.A system model applicable to the parallel combined spread spectrum scattering communication is designed,and a multipath search and delay estimation method for this model is proposed.The proportion of pilot sequences is reduced by the coherence time of the scattering channel.Simulation and comparative analysis are carried out.When SNR=-8 dB,its signal recognition probability can reach above 90%,and in the range of low signal-to-noise ratio(SNR),its correct recognition probability can be improved by about 60%in comparison with that of the non-anti-multipath technology.The BER(bit error rate)performance of the system is analyzed by differentiating the full multipath and the insufficient multipath.In the interval of SNR>-2 dB,its BER is reduced by more than three orders of magnitude in comparison with that of the non-resistant multipath technology.The results show that the proposed technology can resist the multipath fading of the system effectively,maintain good working performance,and ensure stable data transmission.

关 键 词：并行组合扩频 散射通信 RAKE接收 并行导频序列 多径搜索 时延估计 

分 类 号：TN926-34[电子电信—通信与信息系统]