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In this paper, we present an enhanced collision arbitration protocol that operates over multiple antennas in RFID systems. An RFID system consists of a reader and tags, and all tags have to be quickly recognized by a reader. Due to a contention based tag transmission, collision arbitration is a very important issue in tag identification. However, collision always happens in the existing single antenna...
In this paper, we present an efficient random access-based resource request protocol that operates over multiple receive antennas. It is a hybrid form of resource request composed of four-way and two-way handshakes. In many of today's wireless systems, a resource request basically requires a four-way handshake between a mobile station (MS) and its base station (BS) because the MS can send a resource...
In this paper, we discuss how to achieve optimal subcarrier allocation for multicast services in wireless OFDM systems. The multicast capacity is limited by the user with the worst channel condition. To overcome this limitation, we exploit the fine granularity scalability (FGS) video coding which divides multicast data into base layer and enhancement layer data. Then we develop an optimal subcarrier...
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