Abstract:
Modern technologies are increasing the Physical Layer (PHY) Data Transmission Rate in
Wireless LANs from hundreds of Mbps in current 802.11n to over Gbps[2]. But overhead of
MAC such as channel access and ACKs have restricted the proportionate improvement in terms
of data throughput efficiency. The efficiency of WLANs has deteriorated from over 80% at 1
Mbps to under 10% at 1 Gbps [1]. It happens due to the allocation of the channel as a single
resource at a time in conventional MAC protocol. In high data rate WLAN, the channel is
divided into several subchannels based on PHY data rate and frame size so that multiple stations
can contend for and use the subchannels based on the condition of their local queues
simultaneously leading to improvement of throughput and general efficiency[2]
In this paper, we propose Predictive Channel Access (PCA), a new system which
constitutes two novel techniques for more efficient handling of media access by using the OFDM
based PHY architecture. First, PCA uses Beacon Message which carries some fixed parameters
to coordinate
subchannel access. Second, the Access Point (AP) has a second antenna, called the listening
antenna which facilitates the simultaneous uplink and downlink between AP and stations
ensuring enhanced fairness among all nodes.
Description:
Supervised by
Dr. Muhammad Mahbub Alam,
Computer Science and Engineering (CSE),
Islamic University of Technology (IUT),
Board Bazar, Gazipur-1704. Bangladesh.