WiFi-ZigBee Mobile Cross-Technology Communication Method And Application Research

The explosive growth in the number of Io T devices has advanced the process of interconnecting heterogeneous wireless devices,and the emerging Cross-Technology Communication(CTC)technology allows heterogeneous wireless devices operating in the same frequency band and following different underlying protocols to be directly connected without gateways.CTC technology breaks down the communication barriers between heterogeneous devices,enables information sharing and resource integration,and is an exploratory attempt to integrate green communications and networks,bringing a new intelligent experience to end users.However,most of the current CTC solutions are aimed at the ideal laboratory environment at rest,and there is still a lack of systematic research on the two-way cross-technology communication of heterogeneous devices in the mobile state.This thesis presents an energy-aware cross-technology communication scheme,Mobi CTC,which supports bi-directional cross-technology communication between WiFi and ZigBee devices in mobile state.The details include:(1)analysis of the causes of heterogeneous interference formation,specifically the interference model of WiFi to ZigBee Received Signal Strength Indicator(RSSI)and ZigBee to WiFi Channel State Information(CSI).(2)WiFi to ZigBee direction,the scheme adopts RSSI as the decoding information,and uses Hampel filtering to effectively extract RSSI data by analyzing the different characteristics of RSSI caused by random noise and crosstechnology information.The Hampel filter is used to extract the RSSI data effectively.In the stationary state,the threshold decoding function is designed to achieve decoding,and in the mobile state,the energy level mapping scheme is used to achieve information decoding within a certain movement distance;(3)ZigBee to WiFi direction,the solution uses CSI as decoding information,fully exploits the amplitude and phase information of CSI of WiFi receiver’s dual antenna,and proposes a linear phase difference solution for the CSI phase shift problem in the mobile state.The solution enables a clearer representation of the cross-technology information,and finally uses machine learning methods to transform the decoding problem into a classification problem to achieve reliable transmission of cross-technology information in the mobile state;(4)A prototype system was designed and implemented based on the research of crossnetwork communication methods combined with the special environment of underground coal mines,using WiFi control terminals to achieve two-way communication between the WiFi communication module of the underground inspection robot and the ZigBee sensing nodes in the roadway.In this thesis,Mobi CTC was designed and implemented using Telos B nodes and USRP X310 platform and experimentally verified.The experimental results show that the system throughput in the mobile WiFi to ZigBee cross-technology communication is 139.535 bps,which is 1.82 times higher than WiZig,and the symbol error rate is 0.016,which is not significantly higher than WiZig;the system throughput in the mobile ZigBee to WiFi cross-technology communication is 250 bps,which is 15.7% higher than Free Bee,and the symbol error rate is 0.0516,which is 23% lower than ZigFi.The system throughput in the mobile ZigBee to WiFi direction was 250 bps,a 15.7%improvement over Free Bee,and the symbol error rate was 0.0516,a 23.21% decrease over ZigFi.The thesis has 62 figures,10 tables and 89 references.