| This paper aims at researching a bluetooth smart home system based on Androidmobile phone. The system can effectively overcome different standards, high cost,reduce installation time and easier to be learnt by user, also can simplify theimplement method, so that the smart home system can be widely used.The main work content:1.Designed the system as three parts, the remote control side, family internalcontrol side and control terminal. Use the software eclipse to develop the embeddedsoftware in different control sides that can be implemented on the Android platform.Provide a friendly man-machine interface. Add text to tell the state of the controlterminal function to users, so the security of the system can be guaranteed.2.According to the system test, analyzed the interference of WiFi and Bluetooth,compared the characteristics of the two communication protocols and confirmd theinterference is due to the data packets collision.3.Use FRESH filter combined with blind adaptive algorithms exploiting thecyclostationary spectral character of Wi-Fi and Bluetooth signals to suppress theinterference caused by spectrum overlapping.Put forward a method implemented atthe receiving end to suppress the interference of Bluetooth and Wi-Fi that found inthe system test. The analysis show that the interference between these twocommunication protocols is due to the co-channel interference, FRESH filterexploiting the cyclostationary spectral character of Wi-Fi and Bluetooth signals cansuppress the interference caused by spectrum overlapping. To achieve the best weightof FRESH filter, two blind adaptive algorithms, CMA and DD, are combined toupdate the weight. The simulation results show that this algorithm can effectivelysuppress the interference in shared band, with the advantage of simple and fastconvergence speed, it is easy to be implemented. |
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