NDLI: Evaluating dynamic OFDMA subchannel allocation for wireless mesh networks on SDRs

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Evaluating dynamic OFDMA subchannel allocation for wireless mesh networks on SDRs

Content Provider	ACM Digital Library
Author	Hollick, Matthias Klose, Robin Loch, Adrian
Abstract	Orthogonal Frequency-Division Multiple Access (OFDMA) has emerged as an advanced technique to enhance resource utilization and efficiency in infrastructure-based networks. However, its performance in wireless mesh networks is mostly unexplored. In this paper, we practically study the benefits of OFDMA in a scenario with multiple co-located transmitters and receivers without centralized controller by means of the software-defined radio platform WARP. We propose five different dynamic subchannel allocation strategies and compare their performance to that of OFDM as a baseline. Four of these strategies are constrained to be fair with respect to the number of subchannels allocated per communication link, while the fifth always allocates a subchannel to its best possible communication link. By means of testbed experiments with software-defined radios, we show that the overall bit error rate can be reduced by a factor of ten, while the overall channel capacity can locally be enhanced by 10% to 30%. Further, we use the Subchannel Avoidance Gain as a metric to quantify the ability of a dynamic subchannel allocation strategy to avoid subchannel allocations resulting in poor channel conditions.
Starting Page	17
Ending Page	24
Page Count	8
File Format	PDF
ISBN	9781450321815
DOI	10.1145/2491246.2491249
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-08-12
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Wireless mesh networks Resource allocation Ofdma
Content Type	Text
Resource Type	Article

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