Title :
A split architecture for random access MAC for SDR platforms
Author :
Di Francesco, Paolo ; McGettrick, Seamas ; Anyanwu, Uchenna K. ; O´Sullivan, J. Colman ; Mackenzie, Allen B. ; DaSilva, Luiz A.
Author_Institution :
CTVR/The Telecommun. Res. Centre, Trinity Coll. Dublin, Dublin, Ireland
Abstract :
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.
Keywords :
access protocols; carrier sense multiple access; field programmable gate arrays; software radio; CSMA MAC protocol; FPGA; GPP; RF front-end; SDR platforms; carrier sensing block; carrier-sensing-based medium access control protocol; contention-based carrier-sensing MAC; delay mean; delay variance; end-to-end throughput; field programmable gate array; frame retransmissions; general purpose processor; multihop environment; network simulator; random access MAC protocol; reconfigurable radio platforms; signal processing; software-defined radio system; split-functionality architecture; Field programmable gate arrays; Hardware; Media Access Protocol; Radio frequency; Sensors; Software;
Conference_Titel :
Cognitive Radio Oriented Wireless Networks (CROWNCOM), 2013 8th International Conference on
Conference_Location :
Washington, DC
DOI :
10.1109/CROWNCom.2013.6636826