Performance of Cooperative Spectrum Sensing System with Multipath Fading Reporting Channel
Journal Title: IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) - Year 2018, Vol 13, Issue 3
Abstract
The detection of the primary user (PU) signal, or what is called the spectrum sensing, represents a serious challenge for releasing reliable cognitive communication systems. Cooperative spectrum sensing can be employed in cognitive radio networks to minimize the uncertainty in the PU detection due to transmission imperfections such as: noise, fading and shadow. Cooperative spectrum sensing can be considered as three-step process. In the first step, each secondary user (SU) performs a local detection followed by decision making independently. In the second step, all SUs forward their local decisions to a network fusion center (NFC). Third, based on the received local decisions the final decision about the PU existence is made at the NFC. In this paper, theoretical analyses for a simple cooperative spectrum sensing system with a reporting channel corrupted by both additive white Gaussian noise (AWGN) and multipath fading are presented. The error performance of the reporting channel is investigated using a discrete time channel model with a combined channel impulse response (CCIR). In the CCIR, the effect of the transmitting filter, receiving filter, and the power delay profile of the physical channel are considered to derive the composite channel impulse response. The overall probabilities of false alarm and miss detection at the NFC with optimum receiver are derived. The impacts of signal-to-noise ratio (SNR) of the sensing channel, the SNR of the reporting channel, the detection threshold, and the channel length on the cognitive radio performance are studied.
Authors and Affiliations
Ali Alqatawneh
Keywords
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