Negative impact of CSMA/CD on WLAN IEEE 802.11

IEEE 802.11 standard operates on frequency 2.4 GHz that provides channel bandwidth for Wireless Local Area Network (WLAN) communication. These frequency bands are widely used for Access Point (AP) on computer networking. It works based on Direct-Sequence Spread-Spectrum (DSSS) and Orthogonal Frequency Division Multiplexing (OFDM) encode technologies. Internet use has been growing and includes users on laptops, smart phones, and tablets. Those users want to access network by using the Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) mechanism. In order to offer the increasing number of internet users, a new AP is replaced to support more users and coverage areas that overlap each other. However, because of this, channel interference issues arise on AP. In this paper, the negative impact of channel interference and performance of the CSMA/CA mechanism are investigated. The results show the impact on AP in terms of delay, throughput, and signal to noise ratio (SNR) of overlapping channels. For non-overlapping channels, retransmission attempts and collision status are investigated. Delay is increased approximately 50%, throughput is dropped to 200%, and SNR is dropped to 58% if the channels of AP overlap each other.