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In this paper, the authors study the One-Sender-Multiple-Receiver (OSMR) transmission technique, which allows a sender to send to multiple receivers on the same frequency simultaneously by utilizing multiple antennas at the sender. OSMR has the potential to significantly improve the downlink performance of wireless LANs, because with OSMR, the Access Point (AP) can send distinct packets to multiple computers at the same time. To study the practicability of OSMR in the indoor environments typical to wireless LANs, the authors implemented a prototype OSMR transmitter/receiver with GNU Software Defined Radio and conducted experiments in a university building.
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