DMCA
Opportunistic Random-Access Scheme Design for OFDMA-Based Indoor PLC Networks
BibTeX
@MISC{Dong_opportunisticrandom-access,
author = {Rongping Dong and Student Member and Meryem Ouzzif and Senior Member},
title = {Opportunistic Random-Access Scheme Design for OFDMA-Based Indoor PLC Networks},
year = {}
}
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Abstract
Abstract—Multiuser systems can benefit from multiuser diversity by assigning channels to users with better channel conditions at different time instants. In this paper, we present an opportunistic random-access scheme for orthogonal frequency-division multiple-access-based indoor power-line communication systems, based on time- and frequency-varying channel conditions, to exploit multiuser diversity. The proposed scheme dynamically adjusts the backoff time of each user according to its own channel-state variations in time and frequency domains during the contention procedure and, thus, “better ” users have a higher priority to contend over their favorable subchannels. Moreover, subchannels are assigned to users with better channel conditions in order to further enhance the system throughput. In addition, an analytical throughput model for such a multiuser and multichannel system is derived to obtain the optimal parameter settings of the proposed access scheme. Simulation results show that the proposed scheme provides significant improvement in system throughput even in the case where the number of users highly exceeds that of subchannels. Index Terms—Crosslayer optimization, multiuser diversity, opportunistic communications, orthogonal frequency-division multiple access (OFDMA), power-line communication (PLC). I.
Keyphrases
opportunistic random-access scheme design ofdma-based indoor plc network proposed scheme channel condition contention procedure favorable subchannels abstract multiuser system significant improvement frequency domain opportunistic random-access scheme proposed access scheme frequency-varying channel condition analytical throughput model channel-state variation different time instant multiuser diversity power-line communication optimal parameter setting system throughput multichannel system simulation result orthogonal frequency-division multiple access backoff time index term crosslayer optimization opportunistic communication
