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We derive probability of detection P d and false alarm P f for spectrum sensing cognitive devices, employing correlated multiple antenna elements using linear test statistic. Detection performance of such sensors is severely degraded due to the correlation among antennas, in addition to that fading channel conditions may further deteriorate the performance. We propose a simple hard decision fusion strategy at the secondary Base Station to improve the performance by exploiting collaborative gain. Region of Convergence (ROC) is also evaluated under OR based fusion strategy. Numerical results certify the proposed proposal.

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Brief communicationIntegrable electronically tunable oscillator TALAT ALTAFt and REHMAN AHMAD KHAN1 An electronically tunable oscillator is described, which uses two programmable integrators, together with either resistor ratios or capacitor ratios. The frequency of oscillation is electronically tunable over about four decades with bias current/ voltage. The circuit is very attractive for implementation in the monolithic IC forms, namely in the bipolar and MOS technologies. Experimental results on the discrete version of the circuit are included.

Abstract-A novel cooperative spectrum sensing algorithm is implemented and analyzed using Raspberry Pi. In the proposed setup, Nokia cell phone is used as a spectrum sensing device while Raspberry Pi functions as a FC device to collect sensing results from local sensing devices. The investigation results of the proposed setup show significant improvement in detection performance as compared to local spectrum sensing techniques. Furthermore, results show a successful communication between sensing nodes and FC.