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Wireless Networks
Erschienen in: Wireless Networks 6/2019

26.04.2018

Throughput performance of NOMA in WLANs with a CSMA MAC protocol

verfasst von: Md. Forkan Uddin

Erschienen in: Wireless Networks | Ausgabe 6/2019

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Abstract

The existing medium access control (MAC) protocols are not able to utilize the full opportunities from power-domain non-orthogonal multiple access (NOMA) technique in wireless local area networks (WLANs). In this paper, we propose a carrier sense multiple access (CSMA) MAC protocol to increase downlink throughput by utilizing the opportunities offered by NOMA technique in downlink access of WLANs. For downlink transmission, an algorithm is developed to select an optimal user-set with appropriate power allocation from a randomly selected user-set. We then develop an analytical model to compute the uplink and downlink throughputs of a WLAN under the proposed MAC protocol by modelling the WLAN system as a discrete time Markov chain. The uplink and downlink throughputs of a WLAN under the proposed MAC protocol are determined by means of the analytical model and the accuracy of the analytical model is verified via extensive simulation. It is demonstrated that the proposed NOMA based MAC protocol improves the downlink throughput significantly compared to an orthogonal multiple access (OMA) based traditional CSMA MAC protocol without reducing the uplink throughput considerably. For a reasonable configuration, the downlink throughput gain is found to be more than 250%. We also study the throughput performance of the proposed MAC protocol for different transmit power levels, user medium access rates, data rates, path loss exponents and number of users in WLAN. We find that the throughput gain obtained by the proposed MAC protocol increases with increasing the transmit power and decreases with increasing the data rates and path loss. However, the change in the throughput gain obtained by the proposed MAC protocol is not significant for increasing the number of users and the user medium access rate.
Vorheriger Artikel Joint MMSE transceiver design for downlink heterogeneous network
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Fußnoten
1
In the protocol interference model, the received signal strengths of all the received signals are assumed to be equal.
 
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Metadaten
Titel
Throughput performance of NOMA in WLANs with a CSMA MAC protocol
verfasst von
Md. Forkan Uddin
Publikationsdatum
26.04.2018
Verlag
Springer US
Erschienen in
Wireless Networks / Ausgabe 6/2019
Print ISSN: 1022-0038
Elektronische ISSN: 1572-8196
DOI
https://doi.org/10.1007/s11276-018-1730-3

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