Abstract
<strong>IEEE 802.11ac standard has brought several significant improvements compared to its predecessor IEEE 802.11n. It managed to break the Gigabits barrier with a combination of both refining older techniques and presenting new ones. The new enhancements such as channel bonding, beamforming, frames aggregation and finer modulation allow Wireless Local Area Networks (WLAN) the use of Very High Throughput (VHT). The physical layer (PHY) data rates are in the range of Gbps in the 5 GHz band. But the variety of releases and options available for this standard has left many ambiguities regarding its real capabilities. The Medium Access Control layer (MAC) throughput is influenced by several factors, causing the MAC efficiency to decrease. In this paper we present a performance analysis in the VHT with frame aggregation for different access mechanisms, different channels and different modulation schemes.</strong>
Highlights
In the past few years Wireless Local Area Networks (WLAN) have been widely deployed due to their mobility, flexibility and efficiency
Several studies based on Bianchi’s model ensued, in [2] a performance analysis of Distributed Coordination Function (DCF) in an IEEE 802.11ac scenario was undertaken with the presence of Hidden Nodes (HN) to evaluate the system’s normalized throughput for the basic access and the Request to Send/Clear to Send (RTS/CTS) scheme in an error prone channel
We presented a simple analytical model to study the effect both access mechanisms of the Distributed Coordination Function, have on the IEEE 802.11ac throughput with and without aggregation
Summary
In the past few years Wireless Local Area Networks (WLAN) have been widely deployed due to their mobility, flexibility and efficiency. For IEEE 802.11 standards the mandatory medium access mechanism is the Distributed Coordination Function (DCF), it can either be used exclusively or along with Point Coordination Function (PCF) which is an optional technique that best suits delay sensitive data transmissions [1]. Several studies based on Bianchi’s model ensued, in [2] a performance analysis of DCF in an IEEE 802.11ac scenario was undertaken with the presence of Hidden Nodes (HN) to evaluate the system’s normalized throughput for the basic access and the RTS/CTS scheme in an error prone channel. An analysis where transmission probability was taken into consideration is carried on in [3] to compare theoretical and simulation findings Another interesting comparison was presented in [4], this model yields accurate results of throughput for both standards IEEE 802.11ac and IEEE 802.11n in both error free channel and error prone channel.
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