摘要
针对现有的无线多径信道测量设备结构复杂或者缺乏实时测量能力的问题,提出了一种基于开源软件定义无线电(GNU Radio)架构的多径信道测量方法。该方法采用FZC(Frank Zadoff Chu)序列作为信道的探测序列,通过通用软件无线电外设(USRP)发射与接收信号,在GNU Radio上对接收序列与本地序列进行滑动相关处理,从而得到信道的时延和衰落信息。由于FZC序列与噪声的互相关值比m序列更低,因此该方法具有较强的抗干扰能力。通过测量信道仿真器模拟的多径信道,结果表明该测量系统在5 dB以上信噪比(SNR)时可准确得到各径的时延与衰落系数,并且能持续反映出信道的变化情况,具有良好的性能。
Aiming at the problem that the existing wireless multipath channel measurement equipment has a complicated structure or lacks real-time measurement capability, a multipath channel measurement method based on the open source software-defined radio(GNU Radio) architecture is proposed. This method uses the FZC(Frank Zadoff Chu) sequence as the channel detection sequence, transmits and receives signals through the Universal Software Radio Peripheral(USRP), and performs sliding correlation processing on the received sequence and the local sequence on GNU Radio to obtain the channel time Delay and fading information. Because the cross-correlation value between FZC sequence and noise is lower than m sequence, this method has strong anti-interference ability. By measuring the multipath channel simulated by the channel simulator, the results show that the measurement system can accurately obtain the delay and fading coefficients of each path when the signal-to-noise ratio is more than 5 dB, and can continuously reflect the channel change, and has good performance.
作者
廖海华
王晖
张胜利
张晓莹
Liao Haihua;Wang Hui;Zhang Shengli;Zhang Xiaoying(College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China;Qian Xuesen Laboratory of Space Technology,Beijing 100094,China)
出处
《电子测量技术》
2020年第7期148-152,共5页
Electronic Measurement Technology
