Demonstration of highly programmable downlink OFDMA (WiMax) transceivers for SDR systems

Eslami, H.; Patel, Gaurav; Sukumar, C. P.; Tran, Sang V.; Eltawil, Ahmed M.; Rao, Raghu; Dick, Chris

doi:10.1145/1530748.1530796

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The third row of Figure 3 shows that this approach 8 performs much better than the UCFO technique. After the correction, there is no circular trace of points visible anymore.…”

Section: B Resultsmentioning

confidence: 97%

“…For the WARP SDR, there exists an OFDMA implementation based on the real-time mode of this platform [7], but it has been specifically developed as a proof-of-concept of an algorithm that distributes power among subchannels according to CSI measurements to improve performance. Hence, it does not offer a flexible framework for prototyping other mechanisms and cannot be easily adapted, as it has been implemented on the WARP FPGA itself, instead of being based on WARPLab. OFDMA implementations based on WARPLab exist [8], but cannot allocate subcarriers based on CSI due to the non-realtime nature of the approach, as explained in the introduction. In contrast, our approach can deal with this limitation by exploiting the coherence bandwidth of the channel.…”

Section: Introductionmentioning

confidence: 99%

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A rapid prototyping framework for practical OFDMA systems using Software Defined Radios

Klose

Loch

Hollick

2013

2013 IEEE International Conference on Sensing, Communications and Networking (SECON)

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State-of-the-art wireless technologies such as LTE employ OFDMA to enable robust and efficient frequency-division multiple access, which is also promising for other scenarios, such as Wireless Mesh Networks. OFDMA can improve throughput by allocating subchannels to the users which experience the best performance on the corresponding frequencies. This has lead to a large body of work on subchannel allocation schemes which optimize throughput while guaranteeing fairness. However, most solutions are discussed at a purely theoretical and/or simulative level. In this paper, we provide a framework for prototyping such schemes on the WARP Software Defined Radio to obtain practical results with small implementation overhead. We design a mechanism which allows to analyze offline how a certain allocation technique would have performed in a previously measured scenario. Moreover, we show that our approach is stable and robust regarding practical issues. While we focus on Wireless Mesh Networks, our system can easily be adapted to infrastructure-based systems.

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“…The third row of Figure 3 shows that this approach 8 performs much better than the UCFO technique. After the correction, there is no circular trace of points visible anymore.…”

Section: B Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A rapid prototyping framework for practical OFDMA systems using Software Defined Radios

Klose

Loch

Hollick

2013

2013 IEEE International Conference on Sensing, Communications and Networking (SECON)

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“…While WiMAX also considered mesh networking [2], such decentralized scenarios were deprecated in a later revision of the standard. In [4], the authors present a demonstration of a downlink OFDMA WiMAX transceiver based on the WARP platform. However, it only deals with the infrastructure-based case.…”

Section: Related Workmentioning

confidence: 99%

Evaluating dynamic OFDMA subchannel allocation for wireless mesh networks on SDRs

Klose

Loch

Hollick

2013

Proceedings of the Second Workshop on Software Radio Implementation Forum

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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.

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Cognitive Radio Rides on the Cloud

Feng¹,

Lin

Khajeh

et al. 2010

2010 - Milcom 2010 Military Communications Conference

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Demonstration of highly programmable downlink OFDMA (WiMax) transceivers for SDR systems

Cited by 3 publications

References 5 publications

A rapid prototyping framework for practical OFDMA systems using Software Defined Radios

A rapid prototyping framework for practical OFDMA systems using Software Defined Radios

Evaluating dynamic OFDMA subchannel allocation for wireless mesh networks on SDRs

Cognitive Radio Rides on the Cloud

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