Phase-shift-key modulation for multimedia multicast transmission in mobile wireless networks

It is a common requirement in a mobile wireless communication network that a radio must be able to transmit a message simultaneously to two or more neighbors in the network. Some of the intended recipients may be more capable than others in the sense that their communication links from the transmitter have less interference, fading, or attenuation. Because it is desirable that a multicast transmission be demodulated and decoded successfully by all radios for which it is intended, the usual approach is to limit the transmission rate to that which can be demodulated and decoded by the least capable receiver among the intended recipients. In this paper multiple-phase-shift-key signal constellations are designed to increase the throughput of multicast transmissions by delivering additional information to more capable receivers along with the multicast message. This additional throughput can be employed to transmit multimedia messages (e.g., voice and data) to the more capable receivers