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Home  >  Volume 32 (Nov. 2015)

Performance Analysis of WLANs under IEEE 802.11g and IEEE 802.11nCoexistence by Ibrahim Abubakar Alhaji (pages 263-268)
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The importance of IEEE 802.11 standard and its impact on wired local area networks (LANs) cannot be over-emphasized as it augments the LANs by allowing user mobility while still connected to the backbone network at good data rate and low cost. Demand for higher bandwidth for applications such video streaming requires some amendments to the standard. This gives birth to IEEE 802.11g first and then IEEE 802.11n with data rates of 54Mbpsand 600Mbps respectively. As the tradition demand, each new standard released has to have a backward compatibility feature enabling it to coexist with older technologies. Only 802.11a was exception to this rule. It is, however, noted that this feature brings about performance degradation or anomaly by slowing down and reducing the overall throughput of the wireless LAN (WLAN) when 802.11g and 802.11n nodes coexist. This work investigates this anomaly and seeks to enhance the network performance by increasing the total throughput and reducing the delay suffered by the network. The results of the simulations run suggest that the network performance could only improve if the 802.11n WLAN is operated in Greenfield mode or when the 802.11n nodes are enabled toutilized 40MHz channel in a mixed mode setting.