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The enormous success of advanced wireless devices is pushing the demand for higher wireless data rates. The industry is satisfying this increasing demand by densely deploying large numbers of access points (APs). Unfortunately, unicast rates, especially in crowded scenarios, remain very low due to severe interference and time-sharing. However, one may take advantage of the broadcasting nature of wireless transmissions to offer high multicast rates. Motivated by this, we present coordinated broadcasting (Co-BCast), a system which coordinates multiple APs to provide participants of big events with high multicast rates that can support multiple high definition video streams. Co-BCast requires no complicated time or frequency synchronization and no instantaneous channel state information. Yet, despite the time and frequency offsets among concurrent transmitters, the aggregate signal from the coordinated APs offers uniform coverage and high SINR to all users. We explore the challenges of such asynchronous transmissions through theoretical analysis and wireless experiments on software defined radio (SDR) testbeds. We use a number of PHY techniques to address those challenges and implement our coordination scheme on top of an 802.11 reference design. Both wireless experiments and large-scale simulations demonstrate that Co-BCast can achieve multicast rates in the order of 100Mbps even in the most crowded scenarios. These rates are orders of magnitude higher than the unicast and multicast rates achieved by uncoordinated transmissions.

High-rate WiFi broadcasting in crowded scenarios via lightweight coordination of multiple access points