Performance Evaluation of Energy Detection Based Spectrum Sensing Technique for Wireless Channel

In this paper the performance of energy detection based spectrum sensing in multipath fading environment is analyzed using OFDM multiplexing technique. A predetermined value of probability of detection and probability of false Alarm is used in order to calculate the optimum threshold value. That threshold value is used to evaluate the performance in the sense of probability of detection Vs SNR. This is known as Constant detection rates (CDR) and Constant False Alarm rates (CFAR). In real time scenarios the noise variance is unknown therefore both known and unknown noise variance cases are also discussed here. MATLAB simulations are used to analyze comparisons in performance for different values of predetermined probabilities of detection and also for different Channel length. Keywords– CDR, CFAR, CR, Channel Length, Channel Taps and Energy Detection