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The Artificial noise (AN) injection scheme is recently proposed to secure wireless transmissions. By simultaneously transmitting data symbols and artificial interference, it prevents the eavesdropper from decoding the secret message intended for the legitimate receiver. In this paper, we mainly focus on weakness of the AN security scheme. First, we analyze the necessary condition for such a scheme...
Adaptive noise cancellation (ANC) is used widely to reduce noise from a noisy speech sound. However the least-mean-square (LMS) algorithm and its variants, such as the normalized (N)LMS, the modified (M)-LMS and the constrained stability (CS)-LMS algorithms do not perform well in ANC since the desired speech signal has a bad effect on the convergence rate and steady state misadjustment of these algorithms...
Based on the finite alphabet property of the communication signals and the subspace theory, a blind source separation algorithm for co-channel signals is presented. A comparison between the proposed method and MUSIC algorithm is made. Although their application backgrounds are different, their principles are similar. On the viewpoint of MUSIC algorithm, a new explanation for the proposed approach...
Two novel algorithms which exploit the fourth-order statistics are proposed for DOA and range estimation of the near-field narrow-band sources. Compared with most proposed methods which can identify only p sources with a (2p + 1)-element ULA (uniformly linear array), the proposed methods can identify 2p or 2p - 1 sources with the same one. Moreover, our methods calculate much fewer fourth-order statistics...
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