UFMC类语音系统同步方案的设计与实现  

Design and Implementation of Synchronization Scheme for UFMC Voice⁃like System

作　　者：袁琼 余豪 徐莉伟 李晓峰 YUAN Qiong;YU Hao;XU Liwei;LI Xiaofeng(Beijing Electronic Science and Technology Institute,Beijing 100070,P.R.China)

机构地区：[1]北京电子科技学院,北京100070

出　　处：《北京电子科技学院学报》2024年第3期12-20,共9页Journal of Beijing Electronic Science And Technology Institute

基　　金：中央高校基本科研业务费资金资助项目。(项目编号:328202235、3282023031)。

摘　　要：端到端语音加密通信系统中,密文语音数据在移动通信网中可能面临的失真、失码等问题,利用通用滤波多载波(Universal Filtered Multi Carrier,UFMC)技术的类语音调制特性可实现信道的抗压缩传输。为进一步增强其抗干扰性能,克服同步偏差的影响,提出一种UFMC类语音时频联合同步方案。该方案首先将Zadoff-Chu序列搭载至UFMC类语音系统的合适载波频段上合成新型类语音同步信号,而后根据UFMC类语音算法滤波器长度应为奇数的特点,构造出具有重复结构的类语音同步信号,使其可凭借自身冗余特性先后完成对时延、频偏的估计。在AMR-NB12.2kb/s声码器模型下的仿真结果表明:所提同步方案能精准定位解调起点,可较好满足UFMC类语音系统同步需求。In end⁃to⁃end voice encryption communication systems,encrypted voice data may suffer from problems such as distortion and code loss in mobile communication networks.Utilizing the voice⁃like modulation characteristics of the Universal Filtered Multi Carrier(UFMC)technology could achieve channel anti compression transmission.To further enhance the anti⁃jamming capability and overcome the impact induced by synchronization bias,a UFMC voice⁃like time⁃frequency joint synchronization scheme is proposed,where first Zadoff⁃Chu sequence is loaded into the suitable carrier frequency band of the UFMC voice⁃like system to synthesize a new voice⁃like synchronization signal,and then a voice⁃like synchronization signal with repetitive structure is constructed according to the characteristic that fil⁃ters in UFMC voice⁃like algorithms have odd filter length,leading to successive time delay and frequen⁃cy offset estimation depending on its own redundancy characteristic.Simulation results performed in AMR⁃NB122kb/s vocoder channel model show that our proposed synchronization scheme could accurately locate the demodulation starting point and well satisfy the synchronization requirements of UFMC voice⁃like systems.

关 键 词：端到端加密 类语音调制 通用滤波多载波 符号定时同步 载波频率同步 

分 类 号：TN918[电子电信—通信与信息系统]