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Shrikrishan Yadav and  Akhilesh Saini and  Krishna Chandra Roy,  In Cognitive Radio the Analysis of Bit-Error- Rate (BER) by using PSO Algorithm.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 789 - 792[viewed 22 October 2017]. Available from: http://waset.org/publications/9371.