针对ZigBee网络与WiFi网络共享2.4 GHz频段造成的信道干扰问题,提出了一种基于线性调频再扩频技术的ZigBee网络中WiFi干扰避免方法.该方法根据检测接收数据包中的链路质量指示值计算ZigBee网络链路通信质量,将链路通信质量作为判断WiFi网络干扰强弱的依据:当链路通信质量低于最低容忍阈值时,利用线性调频再扩频技术展宽ZigBee网络信道射频信号频谱,反之则保持原有射频信号频谱带宽传输数据.Matlab仿真结果表明,该方法能明显提升ZigBee网络抗击WiFi信号干扰的能力,具有较好的实际应用价值.%To solve the channel interference problem caused by WiFi network at 2 . 4 GHz in ZigBee net-works, an interference avoidance method based on Linear Frequency Modulation and Direct Sequence Spread Spectrum( LFM-DS-SS) is proposed. Link communication quality is employed to determine the strength of WiFi networks interference, which is calculated based on received signal strength indication ( RSSI) . The radio frequency signal spectrum of ZigBee networks will be expanded based on LFM-DS-SS when the link communication quality is smaller than the preset tolerance threshold. On the contrary, the radio frequency signal spectrum will be held. Experimental result based on Matlab shows that the method can significantly improve the anti-interference ability of ZigBee network against WiFi signal interference.
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