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A fundamental challenge in wireless multicast has been how to simultaneouslyachieve high-throughput and low-delay for reliably serving a large number ofusers. In this paper, we show how to harness substantial throughput and delaygains by exploiting multi-channel resources. We develop a new scheme calledMulti-Channel Moving Window Codes (MC-MWC) for multi-channel multi-sessionwireless multicast. The salient features of MC-MWC are three-fold. (i) Highthroughput: we show that MC-MWC achieves order-optimal throughput in themany-user many-channel asymptotic regime. Moreover, the number of channelsrequired by a conventional channel-allocation based scheme is shown to bedoubly-exponentially larger than that required by MC-MWC. (ii) Low delay: usinglarge deviations theory, we show that the delay of MC-MWC decreases linearlywith the number of channels, while the delay reduction of conventional schemesis no more than a finite constant. (iii) Low feedback overhead: the feedbackoverhead of MC-MWC is a constant that is independent of both the number ofreceivers in each session and the number of sessions in the network. Finally,our trace-driven simulation and numerical results validate the analyticalresults and show that the implementation complexity of MC-MWC is low.

High Throughput Low Delay Wireless Multicast via Multi-Channel Moving Window Codes