Medium access control for full-duplex in wireless local area networks
Marlalı, Deniz (2015) Medium access control for full-duplex in wireless local area networks. [Thesis]
Current wireless technologies strive to respond to the arising demand for the increase in mobile traffic. Recently, with the introduction of self-interference (SI) cancellation techniques, wireless full-duplex communication has become an attractive solution that doubles the spectral e ciency and enhances data rates. In this thesis, we present a medium access control (MAC) protocol, named Synchronized Contention Window Full-Duplex (S-CW FD) protocol for enabling full duplex communication in wireless local area networks (WLANs). The proposed S-CW FD protocol can not only work in ad hoc and infrastructure modes of IEEE 802.11 WLANs, but with the legacy nodes as well. In this work, saturated throughput of S-CW FD is derived based on a two dimensional Markov chain model, similar to Bianchi's, and those results are used to validate simulations in OPNET tool. Via detailed simulation experiments, the performance of S-CW FD is evaluated under different self-interference models and wireless network conditions. It is shown that when there are no hidden nodes in the network, the S-CW FD protocol can double the throughput of half-duplex IEEE 802.11, and in the presence of hidden nodes in the network, the throughput gain of full duplex over half-duplex can get as high as ten fold, even for moderate SI cancellation levels and heavy load. Comparisons with existing similar FD MAC protocols also indicate that the proposed S-CW FD protocol performs best under realistic network conditions and residual SI. Hence, S-CW FD stands out as a promising FD MAC protocol with a high chance of application in WLANs, not only for signiffcant performance improvements, but also for its exibility and backwards compatibility.
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