Wireless sensor/actuator-network with improved coexistence performance for 2.45 GHz ISM-band operation

In automation applications many different wireless technologies and standards are in use. Generally, these do not have a possibility for RF-intercommunication and active coexistence. One way to improve coexistence to another wireless system is to reduce transmission times and to use as less transmission power as possible. Therefore it is advantageous to use only frequencies where the frequency-selective and time-variant channel transfer function guarantees low signal losses. The improvement in reception quality that can be achieved this way can be used to reduce transmission power without falling below the receiver sensitivity limit. In a typical automation application this method was validated. Potential signal-to-interference distances can thus be reduced by a factor of three. Also the interference level to neighboring systems can be decreased by 10 dB, improving coexistence among all neighbouring wireless systems operating in the same frequency band in an easy way.