Results 41 to 50 of about 52,116 (297)
IEEE Access, 2017 In this paper, a random frequency diverse array-based directional modulation with artificial noise (RFDA-DM-AN) scheme is proposed to enhance physical layer security of wireless communications.
Jinsong Hu +5 more
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Robust Synthesis Scheme for Secure Multi-Beam Directional Modulation in Broadcasting Systems
IEEE Access, 2016 Recently, directional modulation has become an active research area in wireless communications due to its security. Unlike existing research work, we consider a multi-beam directional modulation (MBDM) scenario with imperfect desired direction knowledge.
Feng Shu +4 more
doaj +1 more source
On direct sums of Baer modules
Journal of Algebra, 2009 A ring \(R\) is called Baer if the left annihilator of every nonempty subset of \(R\) is generated by an idempotent. In a general module theoretic setting, the concept of a Baer module was defined by the present authors [in Commun. Algebra 32, No. 1, 103-123 (2004; Zbl 1072.16007)] in terms of its endomorphism ring. Indeed, a right \(R\)-module \(M_R\)
Rizvi, S. Tariq, Roman, Cosmin S.
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Directing projective modules [PDF]
Archiv der Mathematik, 1993 Let \(A\) be a finite dimensional algebra over a field \(K\). By a module \(M\) we mean a right \(A\)-module of finite length. If \(M_ 1\) and \(M_ 2\) are indecomposable modules, we write \(M_ 1\preceq M_ 2\) if there exists a sequence \(M_ 1=X_ 1\to X_ 2\to \cdots\to X_ m=M_ 2\) of nonisomorphisms between indecomposable modules \(X_ 1,\dots,X_ m ...
Happel, Dieter, Ringel, Claus Michael
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Achieving full diversity in multi-antenna two-way relay networks via symbol-based physical-layer network coding [PDF]
, 2013 This paper considers physical-layer network coding (PNC) with M-ary phase-shift keying (MPSK) modulation in two-way relay channel (TWRC). A low complexity detection technique, termed symbol-based PNC (SPNC), is proposed for the relay.
Lv, Tiejun +4 more
core +1 more source
IEEE Access, 2018 In a directional modulation network, a general power iterative (GPI) based beamforming scheme is proposed to maximize the secrecy rate (SR), where there are two optimization variables required to be optimized. The first one is the useful precoding vector
Hai Yu +9 more
doaj +1 more source
, 2013 Network coding (NC) compresses two traffic flows with the aid of low-complexity algebraic operations, hence holds the potential of significantly improving both the efficiency of wireless two-way relaying, where each receiver is collocated with a ...
Chen, Wei, Hanzo, Lajos, Cao, Zhigang
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Low-cost directional modulation for small wireless sensor nodes
, 2022 S.3654-3656The paper proposes the use of a switchless reconfigurable antenna for a compact and low-cost directional modulation system. These systems are known to provide enhanced privacy of wireless systems, however the necessity for large antenna arrays
Ammann, M.J. +2 more
core +1 more source
Power Allocation Strategy of Maximizing Secrecy Rate for Secure Directional Modulation Networks
IEEE Access, 2018 In this paper, given the beamforming vector of confidential messages and the artificial noise (AN) projection matrix and total power constraint, a power allocation(PA) strategy of maximizing secrecy rate (Max-SR) is proposed for secure directional ...
Siming Wan +8 more
doaj +1 more source
Contra-directional coupling into slotted photonic crystals for spectrometric applications
, 2014 We propose and demonstrate the concept of a contra-directional coupler between a W1 and a slotted photonic crystal waveguide. The bandwidth and operating wavelength of such a coupler can be controlled via its geometrical parameters, and power transfer is
Krauss, T.F. +5 more
core +1 more source