Study of the Effect of Adjacent and Co-Channel Interference on the Performance of a Wi-Fi Network with a hannel Width of 40 MHz in the 2.4 GHz Band

Abstract

For a long time, Wi-Fi networks have used 22 MHz wide (IEEE 802.11b) and 20 MHz wide (IEEE 802.11a/g) channels only. With the advent of the IEEE 802.11n, it became feasible to combine two adjacent 20 MHz channels to make a 40 MHz channel. By doubling channel width, it is possible to double data rates. However, neighboring Wi-Fi networks using 40 and 20 MHz wide channels can negatively affect each other due to adjacent and co-channel interference. Research subject. In this paper, we present the results of an experimental study of parallel operation of two Wi-Fi networks using 40 MHz and 20 MHz channels in the 2.4 GHz band. Method. To achieve this goal, the following methods of empirical research were used: measurement and experiment. Core results. Using a test bed, parallel
 operation of neighboring Wi-Fi networks using 40 MHz and 20 MHz channels in the 2.4 GHz band was simulated. Based on the captured traffic, the effective data rate and the retry rate for both Wi-Fi networks were calculated. Practical relevance. The obtained results can be used for manual or automatic configuration of Wi-Fi routers.