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In spectrum sharing networks with relay cooperation, primary users can benefit from the assistance of secondary users while secondary users accessing the primary bandwidth to transmit their signals. Reasonable relay selection strategy can improve the performances of both primary and secondary users in terms of higher transmission data rate and lower outage probability, and at the same time, frequent...
In this paper, a multiple parameters weighted fractional Fourier transform (MP-WFRFT) and constellation scrambling (CS) method based physical layer (PHY) security system is proposed. The proposed scheme is executed by two steps. In the first step, MP-WFRFT, implemented as the constellation beguiling (CB) method, is applied to change the signal's identity. In the second step the additional pseudo random...
In this letter, a parallel-combinatory-spreading-based weighted fractional Fourier transform (PCS-WFRFT) system aiming to guarantee physical layer (PHY) security is proposed. In this system, the transmission data are first divided into two groups. Based on the first group of data, a set of pseudonoise sequences is generated and then used to spread and encrypt the second group of data. In general,...
In order to investigate the complex course of electricity and mechanism of erosive gastritis (EG), including its rhythm, transmission, gastric empty course and the influences of them, it is neccesery to extract gastric motility feature indexes. Methods: According the clinic standardization, 30 volunteers of erosive gastritis were selected. The signal processing device was designed by Chongqing University...
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