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直接序列扩频具有抗干扰能力强、截获概率低等优点,因此在军用和民用通信中得到广泛的应用,变换域滤波技术可以抑制直扩系统中的强窄带干扰,尤其是时变窄带干扰,干扰信号的功率大大减少了,从而提高了信噪比。直扩接收机中采用变换域滤波技术是提高无线通信设备抗干扰能力的理想方案之一。在原理分析的基础上,给出了直扩-变换域滤波接收机关键模块的具体实现方案。对该接收机的实现具有较高的参考和实用价值。
Direct sequence spread spectrum has the advantages of strong anti-interference capability and low probability of interception, so it has been widely used in military and civil communications. The transform domain filtering technology can suppress the strong and narrowband interference in DSSS system, especially the time-variant narrowband interference, The power of the interfering signal is greatly reduced, thereby improving the signal-to-noise ratio. The use of transform domain filtering in DSSS receivers is one of the ideal solutions to improve the anti-interference ability of wireless communication equipment. On the basis of the principle analysis, the concrete realization scheme of the key module of the DSSS-FFT filter is given. The realization of the receiver has a higher reference and practical value.