Cognitive radio testbed: further details and testing of a distributed genetic algorithm based cognitive engine for programmable radios | IEEE Conference Publication | IEEE Xplore

Cognitive radio testbed: further details and testing of a distributed genetic algorithm based cognitive engine for programmable radios


Abstract:

This paper provides details of a distributed genetic algorithm (GA) based cognitive radio engine model for disaster communications and its implementation in a cognitive r...Show More

Abstract:

This paper provides details of a distributed genetic algorithm (GA) based cognitive radio engine model for disaster communications and its implementation in a cognitive radio test bed using programmable radios. Future applications include tactical and covert communications. The cognitive system monitor (CSM) module presented here permits cross layer cognition and adaptation of a programmable radio by classifying the observed channel, matching channel behavior with operational goals, and passing these goals to a wireless system genetic algorithm (WSGA) adaptive controller module to evolve and optimize radio operation. The CSM module algorithm provides for parallel distributed operation and includes a learning classifier and meta-GA functions that work from a knowledge base (which may be distributed) in long term memory to synthesize matched channels and operational goals that are retained in short term memory. Experimental results show that the cognitive engine finds the best tradeoff between a host radio's operational parameters in changing wireless conditions, while the baseline adaptive controller only increases or decreases its data rate based on a threshold, often wasting usable bandwidth or excess power when it is not needed due its inability to learn.
Date of Conference: 31 October 2004 - 03 November 2004
Date Added to IEEE Xplore: 15 August 2005
Print ISBN:0-7803-8847-X
Conference Location: Monterey, CA, USA

BACKGROUND

Emerging programmable radio technology such as the frequency and waveform agile radios available as part of the Joint Tactical Radio System (JTRS) program promise to open up new opportunities for robust and secure military communications. These software defined radios (SDR) will become even more powerful with the addition of electromagnetic environment sensing technologies that are being developed through the Defense Advanced Research Projects Agency (DARPA) NeXt Generation (XG) Communications research program. DARPA is developing the XG technology to allow multiple users to share use of the spectrum through adaptive mechanisms that allow opportunistic spectrum access in terms of time, frequency, code, and other signal characteristics. DARPA's goals are to enable an increase of a factor of ten in the usage of spectrum [1].

References

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