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In dense radio frequency identification (RFID) system, reader collision problem is bottleneck of overall system performance. In this paper we propose a distributed multi-channel reader anti-collision MAC (ACMAC) protocol to mitigate the reader collision problem. The proposed probability based channel selection approach helps selecting channel efficiently and reduces the waiting time and beaconing...
3GPP LTE is many different from the existing WCDMA based systems. The newness and the complexity of 3GPP LTE physical layer give increment to a number of product development challenges. This paper summarizes the change of physical layer and modulation scheme for 3GPP LTE and shows the simulation and test results of complex LTE physical layer and modulation scheme.
While many researchers have focused on bit-loading algorithm itself, this paper introduces a way to implement bit-allocation in terms of Layer-2 protocol for improvement of commercial Wi-Fi networks. In this paper, a novel protocol is proposed to allow to implement a bit-allocation over time-varying wireless channels by using as small overhead as only one OFDM symbol.
Even though multicast data transmissions in wireless communication standards doesn't require ARQ, to achieve reliable multicast over wireless channel, using ARQ is inevitable. However, unlike unicast, a sender needs to receive multiple acknowledgements (ACKs) from group members, and transmitting ACK from each group member degrades the network performance due to the overhead including multiple ACK...
Frame synchronization is an critical factor for an effective operation of OFDM (orthogonal frequency division multiplexing) based communication systems. In this paper, we present and analyze an efficient frame synchronization method based on m-sequence for OFDM-based mobile multimedia communication systems. Repeated m-sequence is superimposed directly to OFDM frames in the time domain. By utilizing...
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