任意频谱分割聚合中的低复杂度FPGA处理框架与实现  

Low-complexity FPGA Framework and Implementation for Arbitrary Spectrum Division Aggregation

作　　者：廖金保 郑霖[1] 张静[2] 杨超[1] 李锦波 LIAO Jinbao;ZHENG Lin;ZHANG Jing;YANG Chao;LI Jinbo(Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing,Guilin University of Electronic Technology,Guilin 541004,China;The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]桂林电子科技大学广西无线宽带通信和信号处理重点实验室,广西桂林541004 [2]中国电子科技集团公司第五十四研究所,石家庄050081

出　　处：《电子信息对抗技术》2023年第1期73-80,共8页Electronic Information Warfare Technology

基　　金：国家自然科学基金资助项目(61571143);大学生创新创业项目(202110595017);广西自然科学基金资助项目(2020GXNSFAA159067)。

摘　　要：频谱聚合(Spectrum Aggregation,SA)技术中,移动、传播时延、射频(Radio Frequency,RF)滤波频相不一致性等会给大频谱跨度的多子谱接收带来频、相和幅度的不同偏移,这成为影响聚合性能的关键问题,且给同步和频域聚合算法的FPGA实时实现带来高的复杂度和时延、逻辑资源开销。有别于常规SA接收机的DSP频域处理体制,设计了一种可用于任意信号频谱分割与聚合的低复杂度FPGA实现框架,即采用锁相环组来估计和补偿各个子频谱的频偏和相偏,并完成数字下变频和位同步、帧同步,且采用特殊设计的时域有限长单位冲激响应(Finite Impulse Response,FIR)滤波器来进行综合滤波。经测算,该多子谱实现框架实现了较低的算法复杂度、FPGA资源消耗和时延。通过搭建FPGA频谱分析、综合收发通信系统,实测验证了其在同步和子谱分析综合精度、FPGA资源消耗和最终信号聚合解调的性能优势。In spectrum aggregation(SA)technology,movement,propagation delay,frequency and phase inconsistency of radio frequency(RF)filter will bring different offsets of frequency,phase and amplitude to multi sub-band spectrum received with large spectrum span.It has become a key problem affecting aggregation performance,and brings high complexity,delay and logic resource overhead to FPGA real-time implementation of synchronization and frequency domain aggregation algorithm.Different from DSP frequency domain processing system of conventional SA receiver,a low complexity FPGA implementation framework for arbitrary signal spectrum segmentation and aggregation is designed.Phase-locked loop group is used to estimate and compensate the frequency offset and phase offset of each sub spectrum,complete digital down conversion,bit synchronization and frame synchronization.A specially designed time-domain finite impulse response(FIR)filter is used for analysis and synthesis filtering.Through calculation,multi sub-band spectrum implementation framework realizes low algorithm complexity,FPGA resource consumption and delay.The performance advantages of FPGA spectrum analysis integrated transceiver communication system are verified by actual measurement in aspects of synchronization and sub spectrum analysis integrated accuracy,FPGA resource consumption and final signal aggregation demodulation.

关 键 词：抗截获 FPGA 频谱聚合 同步 低复杂度 

分 类 号：TN927.2[电子电信—通信与信息系统] TN791[电子电信—信息与通信工程]