Interference Analysis of 802.11b and 802.11g Wireless Systems

The interference characteristics of 802.11b and 802.11g systems are expected to be different due to them using different types of wireless interface. In this paper the performance degradation caused by interference between the same types of system is analysed analytically for a binary, phase modulated system. Overall it is shown that 802.11b and 802.11g systems are both affected by interference when the desired and interfering signals are separated by less than 20 MHz. It is also shown that for 802.11g systems the performance degradation caused by interference is essentially independent of the frequency separation whereas for 802.11b systems it reduces significantly with increasing separation.