智能家居网络自适应跳频技术研究

Research on frequency agility in smart home network

在智能家居网络环境下,为了提高无线通信过程中的抗干扰能力,将无线跳频技术中接收信号强度指示(received signal strength indication,RSSI)阈值判断跳频广播技术和丢包数粗同步跳频算法相结合,提出一种新型的无线跳频方案.主从节点在通信阶段计算连续丢包数,达到预设值时对信道RSSI采样取均值,超过阈值则进入频率切换阶段.结果表明,该方案可以准确及时监测到通信干扰,并且能够避免非频率干扰因素引起的跳频,比当前的跳频方案有效性更高、切换时延更短.

In the smart home network environment, in order to improve the radio interference immunity in the wireless communication process, this paper puts forward a new radio frequency-hopping scheme by combining the technology of received signal strength indication(RSSI) in threshold determining hopping broadcasting in the radio frequency-hopping techniques with the frequency-hopping algorithm for the number of coarse synchronization packet loss. The master node calculates the number of consecutive packet loss in the communication phase. When the preset value is reached, the channel RSSI samples are averaged and the threshold is exceeded. The master node calculates the continuous packet loss of the communication phase which will take the samples of the RSSI channel and average samples when reaching a present value and it will enter frequency switching stage if exceeding the threshold. The results show that the scheme can monitor the communication interference accurately and timely, and avoid frequency-hopping caused by non-frequency interference factors, which has shorter handoff delay and is more effective than the current frequency-hopping scheme.