Efficient Wireless Multicast Protocol with Orthogonal CTS Modulation Supporting Video Conferencing

Multicast based video conferencing in wireless networks is recently receiving more and more attention. In this paper, we propose a novel linker-level protocol, multicast with orthogonal CTS (MOCTS) protocol, to provide efficient wireless multicast. Our approach uses orthogonal Walsh code to modulate CTS packets at different receiving nodes. The modulated CTSs are simultaneously transmitted and decoded at the source node, thus considerably reducing multicast CTS collisions. Simulation results show that the MOCTS protocol can reduce more than 20% in total transmission efforts