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A spurious-mode-suppressing method is introduced in this paper, aiming at increasing frequency interval between operating mode (TM310 mode) and spurious mode (TM020 mode). By means of CST-MWS, we find that the frequency interval can be increased 0.65 GHz in X-band by the method.
This paper presents a multi-antenna cognitive radio (CR) system that is capable of operating concurrently with the primary radio (PR) link. The operation of the CR system consists of three stages: environmental learning, CR channel training and CR data transmission. In environmental learning stage, partial channel information between PR and CR are obtained blindly, based on which the transmit beamforming...
This demonstration program presents the V*-kNN algorithm, an efficient algorithm to process moving k nearest neighbor queries (MkNN). The V*-kNN algorithm is based on a safe-region concept called the V*-Diagram. By incrementally maintaining the V*-Diagram, V*-kNN continuously provides accurate MkNN query results and supports dynamically changing values of k. Our approach exploits information regarding...
This paper studies the wireless two-way relay channel (TWRC), where two source nodes, S1 and S2, exchange information through an assisting relay node, R. It is assumed that R receives the sum signal from S1 and S2 in one timeslot, and then amplifies and forwards the received signal to both S1 and S2 in the next time-slot. By applying the principle of analogue network coding (ANC), each of S1 and S2...
Holographic biology found by Chinese Professor Ying-qing Zhang has turned on a new era from the point of view of cognizing the world and has led to a cognitive transform in cognition field and will has broad developmental and applied space. According to systems science and system cognition idea, holographic idea is theoretically explained, it is considered that holographic biomedicine is just a biomedical...
The short term flicker severity Pst is an important index of power quality in the standards of IEC. Usually Discrete Fourier Transform (DFT) is used to calculate Pst, due to the inherent spectral leakage and barrier effect of DFT lead to low accuracy of Pst, therefore a method to improve the accuracy of Pst is proposed in this paper, the corn of this method is that, using DFT and Discrete Fourier...
Spyware is a kind of malicious code that is installed on victims' machines without their content. They spy on the users' behavior and compromise their privacy, while transmitting sensitive information to some remote servers. Current anti-spyware tools are similar to anti-virus products in that they identify known spyware by comparing the binary image to a database of signatures. Unfortunately, these...
The malicious code has characteristic of various types, and its ability of hiding increases quickly. In this paper, according to the analysis of hiding technology of malicious programs, it proposed a new idea of detecting malware based on the raw data. Finally, the results are given, which are compared with the current security detection scanners. It is a beneficial attempt of this method in detecting...
This paper studies the information-theoretic limits of a cognitive radio (CR) network under spectrum sharing with an existing primary radio (PR) network for wireless communications. In particular, the fading cognitive multiple-access channel (C-MAC) is studied, where multiple CR users transmit to the base station (BS) of the CR network under both individual transmit power constraints and a set of...
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