Chaowen Liu

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This paper investigates the physical-layer security of a multiuser peer-to-peer (MUP2P) relay network for amplifyand-forward (AF) protocol, where a secure user and other unclassified users coexist with a multi-antenna eavesdropper and the eavesdropper can wiretap the confidential information in both two cooperative phases. Our goal is to optimize the(More)
In this paper, we propose a novel scheme to enhance the security of a single source-destination cooperative network with multiple helpers and one eavesdropper, where a helper operates as a jammer and the others use amplify-and-forward (AF) protocol to deliver a weighted version of the received signal. Since the instantaneous channel state information (CSI)(More)
Owing to its closed-form and ambiguity-resolving capability, the Chinese Remainder Theorem (CRT) has been applied recently into the Radio Interferometric Positioning System (RIPS) to get a robust range estimation. Although the existing robust CRT based ranging algorithms can resist the remainder errors to an acceptable level, they merely take advantage of(More)
In this paper, we investigate the secrecy performance of matched-filter (MF) and zero-forcing (ZF) precoding in a multiuser massive multiple-input multiple-output (MIMO) system with a multi-antenna passive eavesdropper. For the two precoding schemes, we find that the equivalent wiretap channels are similar and thus the eavesdropper achieves the approximate(More)
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