Enterprise Wireless LANs (EWLANs) have increasingly become prevalent in recent years. They are widely deployed in public places, such as universities, malls, airports and office buildings, providing Internet connections. On the other hand, there is an explosive increase in demand for wireless service as mobile devices such as smart phones and tablets have gained immense popularity. Currently, the widely deployed 802.11 standard is shown to have low channel efficiency and suffers from well known problems, such as hidden terminal problem and exposed terminal problem. To meet the growing demand for wireless data, it is time to move away from the age-old paradigm of prohibiting interfering nodes from transmissions.

We first present Rapid Concurrent Transmission Coordination (RCTC), a fast and low overhead signaling mechanism based on Pseudo-random Noise (PN) sequences to enable multi-modal operation of wireless links in a distributed channel access setting to support concurrent transmissions with full duplex radios. We look beyond a node pair and explore how a network can best utilize the full duplex capability. I.

n enterprise networks, access points (AP) are connected to the backbone network, which allows APs to communicate with each other. We takes advantage of the backbone network and seek opportunities for concurrent transmissions to increase the performance of EWLANs with three different techniques: DOMINO, BBN and BASIC.

DOMINO is a centralized relative scheduling scheme for channel access in enterprise networks. Existing centralized packet scheduling algorithms suffer from the requirement of tight time synchronization and are thus difficult to use in practice. We introduce Relative Scheduling: a technique for triggering wireless transmissions through other wireless transmissions in a domino-like fashion, thus making tight time synchronization unnecessary.

Today's EWLANs are comprised of densely deployed APs. To take advantage of that, we present Blind Beamforming and Nulling (BBN), an interference nulling scheme that leverages the high density of access points to enable multiple mobile devices to transmit simultaneously to multiple access points (APs), all within a single collision domain. BBN scales the uplink throughput linearly with the number of clients.

Through proactive management of interference among multiple colliding packets, high throughput wireless systems can be designed. We propose BASIC, a lightweight multi-user uplink transmission strategy that does not require tight synchronization. In BASIC, every client transmits with a data rate that is able to tolerate interference from other transmissions. Decoded packets are shared through the backbone network and their interference can be therefore cancelled.

RCTC and DOMINO are suitable for networks where the backbone network capacity is limited since they generate the least amount of traffic. BASIC is suitable for networks with small number of APs in a single collision domain while BBN is best in networks with high density of APs. This thesis discusses these schemes in detail and presents techniques to address the challenges in their practical implementations.