Analysis of Spectrum Sensing By Using Energy Detection Technique in Cognitive Radio

Abstract: In wireless technologies the importance of spectrum is rapidly increases hence traffic of spectrum is also increases day by day. However, it seems that the current technologies do not utilize the licensed spectrum bands efficiently (6).So, energy detection in cognitive radio is proposed to improve the spectrum utilization. Cognitive Radios are the secondary users of the allocated spectrum bands for the primary users. In the cognitive radio system, the signal detection technique is required for spectrum sensing in order to sense the occupied and vacant bands. The challenge of spectrum sensing is the detection of poor signals in the presence of noise and interference (7). In this paper, have evaluated the performance of energy detection system under the real noise at -10dB, -15dB & -20dB SNR using energy detection. In general Energy detector is the one of the method used in spectrum sensing due to its simplicity; it requires no need of synchronization and knowledge of transmission information through the transmitter.