In this paper, we present multiple antennas-based improved sensing detector (MA_ISD). The proposed scheme reduces sensing failure problem and improves reliability by using adaptive threshold and multiple antennas patterns. The presented scheme uses two detectors concept, detectors imply multiple antennas, follows selection combination to select best signals. The proposed model enhances the detection performance and takes less sensing or detection time. Out of the two detectors, the first one is energy detector with a single adaptive threshold (ED-SAT) and the second one is energy detector with two adaptive thresholds (ED-TAT). The thresholds are adaptive as they are dependent on noise variance (sigma(2)(omega)), and the value of this noise variance changes according to the noise signal. Both the detectors work simultaneously, and their output is then fed to a decision device which takes the decision using OR-rule. In the proposed scheme, more than one antenna has been used and is compared with existing sensing techniques. Results show that the proposed multiple antennas-based improved sensing detector (MA_ISD) technique while number of antennas (N-r) = 2, improves the detection performance by 24.6%, 53.4%, 37.9%, and 49.6%, as compared to existing schemes (i.e., EDT-ASS-2015 scheme, ED and cyclo-2010, adaptive SS-2012, and conventional-ED) scheme at - 12 dB SNR, respectively. Meanwhile, proposed technique also decreases sensing time in the order of 47.0 ms, 49.0 ms, and 53.2 ms as compared to existing schemes (EDT-ASS-2015, Adaptive SS-2012, and ED and Cyclo-2010) scheme at - 20 dB SNR, respectively.
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