  Nowadays, IEEE 802.11, i.e., Wi-Fi has emerged as a prevailing technology for
broadband wireless networking. To meet the tremendous rise of demand for future
generation wireless LANs, a robust and efficient MAC protocol is required for
the Wi-Fi network. However, traditional MAC mechanisms are not suitable for
next-generation communications due to some inherent constraints. In this
regard, OFDMA technology could be adopted to design an efficient MAC protocol
for the Wi-Fi network.
  The purpose of this research is to provide a high-speed network for Wi-Fi
users. The thesis presents three MAC protocols, namely, HTFA (High Throughput
and Fair Access), ERA (Efficient Resource Allocation), and PRS (Proportional
Resource Scheduling), by employing the OFDMA technology. The novel protocols
improve Wi-Fi communication using the latest IEEE 802.11ax standard, i.e.,
Wi-Fi 6. In particular, the protocols improve several performance parameters of
the MAC protocol, such as increasing the throughput, goodput, fairness index,
and reducing the packet retransmissions, collisions, etc. Simulation results
validate that the new protocols are far better than the existing protocols.
  The protocols designed in this thesis are compliant with the latest IEEE
802.11ax standard that promises to enhance the throughput at least four times
per user and support ten times users. Thus, the new protocols can ensure
uninterrupted and smooth communication in highly dense environments. The thesis
contains a lot of resources such as the state of the art of MAC protocols,
analysis of contemporary protocols and their performance matrix; architecture
of Wi-Fi system, OFDMA constraints and regulations; framework of protocols;
analytical models; relevant data, theory, and methods; etc. that would be the
valuable resources to the future researchers for the research on the Wi-Fi
network.
