In response to the downlink synchronization requirements of the user equipment(UE)or third-party radio equipment in fifth-generation(5G)mobile communication systems,a synchronization algorithm of primary synchroni-zat...In response to the downlink synchronization requirements of the user equipment(UE)or third-party radio equipment in fifth-generation(5G)mobile communication systems,a synchronization algorithm of primary synchroni-zation signal(PSS)was designed and developed in the 5G system based on block cross-correlation.According to the new characteristics of the 5G synchronization channel and broadcast channel,starting from the traditional downlink synchronization algorithm of long-term evolution(LTE),the detection performance of the algorithm under a low signal-to-noise ratio(SNR)is improved by introducing an incoherent accumulation,and the new scheme of joint coarse frequency offset estimation is used to improve the frequency offset estimation performance.Finally,the performance of the proposed synchronization algorithm is verified by conducting a simulation on a 5G downlink simulation platform based on MATLAB software.Simulation results show that the improved downlink synchronization algorithm has stable performance in the tapped delay line-C(TDL-C)and additive white Gaussian noise(AWGN)channels with large frequency deviation and low SNR.展开更多
3Gpp长期演进(long term evolution,LTE)技术中主同步信号是一组复小数序列,这使得子帧同步的运算量非常大。介绍了主同步信号的构成,分析了同步信道滤波器对子帧同步性能的影响。提出了通过量化近似本地主同步信号以减少LTE子帧同步运...3Gpp长期演进(long term evolution,LTE)技术中主同步信号是一组复小数序列,这使得子帧同步的运算量非常大。介绍了主同步信号的构成,分析了同步信道滤波器对子帧同步性能的影响。提出了通过量化近似本地主同步信号以减少LTE子帧同步运算量的方法,并在AWGN(additive white guassian noise)和LTE标准中的EVA(extended vehicular a model)多径信道环境下对此方法进行了仿真。仿真表明量化本地主同步信号不会影响小区主同步码号的识别,对FFT窗定时检测性能影响也非常小。通过运算复杂度分析,当把本地主同步信号量化为2bit后,该方法所需乘法和加法次数较量化本地主同步信号前分别降低约98.8%和70.3%。在不同信噪比和载波频偏环境下的仿真结果表明该低复杂度子帧同步方案可应用于信噪比大于0,初始载波频偏小于4 kHz,最大多普勒频移小于100 Hz的环境中。最后在FPGA上对此低复杂度子帧同步方法进行了实现,并成功应用于TDD-LTE扫频仪中。展开更多
针对4G(the 4^(th)-Generation)移动通信智能终端设备在某些特定场合泄露敏感信息的隐患,提出一种基于4G同步信道的终端屏蔽方法。首先对同步信道屏蔽原理进行描述,然后对LTE(Long Term Evolution)系统结构和同步模型进行分析,最后在LT...针对4G(the 4^(th)-Generation)移动通信智能终端设备在某些特定场合泄露敏感信息的隐患,提出一种基于4G同步信道的终端屏蔽方法。首先对同步信道屏蔽原理进行描述,然后对LTE(Long Term Evolution)系统结构和同步模型进行分析,最后在LTE下行链路模型中对干扰性能进行仿真。仿真结果可以看出,干信比为-17 dB时,主同步信号漏检概率将达到99%,从而阻止终端完成小区搜索。展开更多
基金The Social Development Projects of Jiangsu Science and Technology Department(No.BE2018704).
文摘In response to the downlink synchronization requirements of the user equipment(UE)or third-party radio equipment in fifth-generation(5G)mobile communication systems,a synchronization algorithm of primary synchroni-zation signal(PSS)was designed and developed in the 5G system based on block cross-correlation.According to the new characteristics of the 5G synchronization channel and broadcast channel,starting from the traditional downlink synchronization algorithm of long-term evolution(LTE),the detection performance of the algorithm under a low signal-to-noise ratio(SNR)is improved by introducing an incoherent accumulation,and the new scheme of joint coarse frequency offset estimation is used to improve the frequency offset estimation performance.Finally,the performance of the proposed synchronization algorithm is verified by conducting a simulation on a 5G downlink simulation platform based on MATLAB software.Simulation results show that the improved downlink synchronization algorithm has stable performance in the tapped delay line-C(TDL-C)and additive white Gaussian noise(AWGN)channels with large frequency deviation and low SNR.
文摘3Gpp长期演进(long term evolution,LTE)技术中主同步信号是一组复小数序列,这使得子帧同步的运算量非常大。介绍了主同步信号的构成,分析了同步信道滤波器对子帧同步性能的影响。提出了通过量化近似本地主同步信号以减少LTE子帧同步运算量的方法,并在AWGN(additive white guassian noise)和LTE标准中的EVA(extended vehicular a model)多径信道环境下对此方法进行了仿真。仿真表明量化本地主同步信号不会影响小区主同步码号的识别,对FFT窗定时检测性能影响也非常小。通过运算复杂度分析,当把本地主同步信号量化为2bit后,该方法所需乘法和加法次数较量化本地主同步信号前分别降低约98.8%和70.3%。在不同信噪比和载波频偏环境下的仿真结果表明该低复杂度子帧同步方案可应用于信噪比大于0,初始载波频偏小于4 kHz,最大多普勒频移小于100 Hz的环境中。最后在FPGA上对此低复杂度子帧同步方法进行了实现,并成功应用于TDD-LTE扫频仪中。
文摘针对4G(the 4^(th)-Generation)移动通信智能终端设备在某些特定场合泄露敏感信息的隐患,提出一种基于4G同步信道的终端屏蔽方法。首先对同步信道屏蔽原理进行描述,然后对LTE(Long Term Evolution)系统结构和同步模型进行分析,最后在LTE下行链路模型中对干扰性能进行仿真。仿真结果可以看出,干信比为-17 dB时,主同步信号漏检概率将达到99%,从而阻止终端完成小区搜索。
