Spectral Interference Study of WiFi on Wireless Sensor Networks

The interference of WiFi on various wireless networks such as Bluetooth, WiFi, wireless USB, cordless phone and microwave ovens that share the same 2.4GHz Industrial, Scientific and Medical (ISM) band is a matter of observation. The standard different modulation techniques like frequency hopping, Direct-Sequence Spread Spectrum (DSSS) and Orthogonal Frequency-Division Multiplexing (OFDM) are involved are to be studied to note the frequency overlap of Wireless Sensor Network (WSN) and WiFi. The findings assist to comprehend the bit error rate and packet error rate based on which a method for co-operative and/or non cooperative interference suppression can be developed. Based on the open IEEE802.15.4 global standard, the list of applications, for the reliable, cost-effective, low power, wirelessly networked, monitoring and control products, is still boosting based upon which the Wireless Sensor Networks (WSN) have become very successful. Reducing power has a positive effect on the frequency spectrum, while, at equal output power the 802.11g (OFDM) spectrum is wider than the 802.11g (DSSS) spectrum and the Worst spectrum is for a 802.11g (OFDM) modulated at 6Mbps. Spectral measurements in obtaining a relationship between bit error rate and signal to interference ratio and a method for co-operative and/or non co-operative interference suppression will be developed as a part of the proposed activity.