Multi-hop MAC implementations for affordable SDR hardware

O'Sullivan, James; Francesco, Paolo Di; Anyanwu, Uchenna K.; DaSilva, Luiz A.; MacKenzie, Allen B.

doi:10.1109/dyspan.2011.5936259

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…We set up a two-hop network using OMNeT++'s standard libraries and modified existing modules in order to replicate our SDR implementation of CSMA, including the impact of modules running in the GPP and those running in the FPGA. It is well known that a conventional SDR node based on USRP suffers of unpredictable turnaround time [4]. Unfortunately, as we have experienced, these effects are more prominent in embedded systems.…”

Section: Simulationsmentioning

confidence: 96%

“…2) Software Implementation: Spreading the MAC between the FPGA and software implementation has some drawbacks, as the software MAC does not know whether a frame has been sent or whether the frame is just waiting in the TX buffer. The original MAC protocol used in this work and described in [4] requires knowledge of when a frame is sent across the network. In the software-only version of the protocol it could be assumed that the frame would be sent immediately.…”

Section: B Carrier Sense Mac Designmentioning

confidence: 99%

“…In the current work, we incorporate the proposed split functionality into two versions of a CSMA MAC protocol, one employing explicit acknowledgements and the other employing implicit acknowledgements, where this last one is particularly tailored for multihop wireless environments. For more details about the explicit and the implicit acknowledgments protocols, interested readers are referred to [4].…”

Section: A Protocolsmentioning

confidence: 99%

“…Enabling networking experimentation on affordable SDR platforms presents a challenge at the Medium Access Control (MAC) layer, where the issues in implementing protocols with reasonable performance have been well summarized in the literature [1]- [3], and were alluded to in our earlier work [4].…”

Section: Introductionmentioning

confidence: 99%

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A Split Architecture for Random Access MAC for SDR Platforms

Francesco¹,

McGettrick²,

Anyanwu³

et al. 2013

Proceedings of the 8th International Conference on Cognitive Radio Oriented Wireless Networks

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Implementation of carrier-sensing-based medium access control (MAC) protocols on inexpensive reconfigurable radio platforms has proven challenging due to long and unpredictable delays associated with both signal processing on a general purpose processor (GPP) and the interface between the RF front-end and the GPP. This paper describes the development and implementation of a split-functionality architecture for a contention-based carrier-sensing MAC, in which some of the functions reside on an FPGA (field programmable gate array) and others reside in the GPP. We provide an FPGA-based implementation of a carrier sensing block and develop two versions of a CSMA MAC protocol based upon this block. We experimentally test the performance of the resulting protocols in a multihop environment in terms of end-to-end throughput and required frame retransmissions. We cross-validate these results with a network simulator with modules modified to reflect the mean and variance of delays measured in components of the real software-defined radio system.

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Section: Simulationsmentioning

confidence: 96%

Section: B Carrier Sense Mac Designmentioning

confidence: 99%

Section: A Protocolsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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