An experimental study of network performance impact of increased latency in software defined radios
Proceedings of the second ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
Enabling MAC protocol implementations on software-defined radios
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
Iris: an architecture for cognitive radio networking testbeds
IEEE Communications Magazine
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Software Defined Radio (SDR) is a technology which facilitates experimentation and the practical realization of novel wireless communication systems. Especially low-cost SDRs, however, experience high communication delays due to the connection between the radio hardware and the host computer. This delay hinders the implementation of Medium Access Control (MAC) protocols. In Carrier Sense Multiple Access (CSMA) based protocols, especially the Clear Channel Assessment (CCA) as well as the subsequent channel access phase are subject to strict temporal constraints. In this paper, we present two strategies that address both issues and aim to enhance the performance and efficiency of CSMA protocols implemented on low-cost SDRs. The first approach employs a dedicated spectrum sensing engine as a CCA agent for the SDR. The second strategy optimizes the frame transmission path inside the SDR. Experimental results indicate that both strategies have a positive impact on reducing the slot time parameter of the CSMA MAC.