부산대학교 도서관

In this paper, we address the use of multi-layered sliding windows to detect the presence of a wireless network for cognitive radio applications. Although synchronization signals of the Long Term Evolution (LTE) has been used as the reference system, the proposed scheme is generic in principle. Our proposed scheme doesn't require any a priori knowledge of the exact synchronization sequences, so it can be classified as a coarse spectrum sensing technique. Firstly, the proposed detection scheme employs a sliding window technique to collect energies from the received primary synchronization sequence (PSS). After that, it uses the maximum of the energies collected from all windows as the decision statistic to detect the network coverage. We compared the proposed technique against other existing schemes that are commonly used in spectrum sensing. Depending on the channel condition and data transmission rate, our numerical results demonstrate that performance of the proposed scheme is more robust against the frequency selectivity of the channels.