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A new plasma antenna of beamforming
 Progress In Electromagnetics Research
"... Abstract—In this paper, a new plasma antenna of beamforming is investigated based upon the interaction of plasma elements due to the incident electromagnetic wave. It presents a study of the multiple scattering from argon plasma cylinders rigorously applying boundary value method, grounded on the p ..."
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Abstract—In this paper, a new plasma antenna of beamforming is investigated based upon the interaction of plasma elements due to the incident electromagnetic wave. It presents a study of the multiple scattering from argon plasma cylinders rigorously applying boundary value method, grounded on the properties of electromagnetic wave transmitted in the argon plasma. Approximate expressions for the total radiation of plasma antenna in the far field are derived briefly. Such a novel plasma antenna of beamforming, according to the research, exhibits interesting performance in terms of radiation efficiency, beamforming and beamscanning. Valid results are brought forth to demonstrate the capabilities of such antenna of two scales. Comparisons are given in detail as well. 1.
Reducing the array size for DOA estimation by an antenna mode switch technique
 Progress In Electromagnetics Research
"... Abstract—In this paper, an antennamodeswitch technique is proposed to reduce the array size for the DOA (directionofarrival) estimation. Conventional DOA estimation requires many elements of antenna array to achieve high resolution, and then suffers from large array size. To improve such disadva ..."
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Abstract—In this paper, an antennamodeswitch technique is proposed to reduce the array size for the DOA (directionofarrival) estimation. Conventional DOA estimation requires many elements of antenna array to achieve high resolution, and then suffers from large array size. To improve such disadvantages, this paper proposes an antennamodeswitch technique to reduce the required number of array elements. Our results show that the required number of array elements will be greatly reduced by using the proposed technique. Furthermore, a bowtie antenna design for implementing the proposed antennamodeswitch technique is also proposed. The results prove that highresolution and accurate properties of such a practical antenna design is very close to those of the ideal antenna mode. 1.
Design of a low sidelobe 4D planar array including mutual coupling
 Progress In Electromagnetics Research M
"... AbstractAn efficient approach is presented for the design of a low sidelobe fourdimensional (4D) planar antenna array, taking into account mutual coupling and platform effect. The approach is based on the combination of the active element patterns and the differential evolution (DE) algorithm. Di ..."
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AbstractAn efficient approach is presented for the design of a low sidelobe fourdimensional (4D) planar antenna array, taking into account mutual coupling and platform effect. The approach is based on the combination of the active element patterns and the differential evolution (DE) algorithm. Different from linear and circular arrays, the mutual coupling compensation in a planar array is more complicated since it requires numerous data of the active element patterns in different azimuth planes. In order to solve this problem, a useful interface program is developed to get these data from commercial software HFSS automatically. Also different from conventional low sidelobe arrays with tapered amplitude excitations, the low sidelobe in the 4D array is realized using timemodulation technique under uniform static amplitude and phase conditions. The DE algorithm is used to optimize the time sequences which are equivalent to the complex excitations in conventional arrays. Both computed results and simulated results in HFSS show that a −30 dB sidelobe pattern can be synthesized in a 76element planar array with an octagonal ground plane and a radome, thus verifying the proposed approach.
USENIX Association 12th USENIX Symposium on Networked Systems Design and Implementation (NSDI ’15) 235 Securing RFIDs by Randomizing the Modulation and Channel
"... Implementation (NSDI ’15) ..."
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FORMING USING THE LEVENBERGMARQUARDT SCHEME FOR TWO DIMENSIONAL AOA ESTIMATION
"... Abstract—In this paper, we adopt the LevenbergMarquardt (LM) algorithm to implement the nonlinear multivariable optimization for azimuth/elevation angleofarrival (AOA) estimation based on the Capon beamforming algorithm. The formulation is based on the fact that the cost function of the Capon alg ..."
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Abstract—In this paper, we adopt the LevenbergMarquardt (LM) algorithm to implement the nonlinear multivariable optimization for azimuth/elevation angleofarrival (AOA) estimation based on the Capon beamforming algorithm. The formulation is based on the fact that the cost function of the Capon algorithm can be expressed in a leastsquares form. The performance in terms of the root mean square error (RMSE) and the computational complexity is illustrated via numerical results. 1.
Antenna Subset Modulation for Secure 1 MillimeterWave Wireless Communication
, 2013
"... The small carrier wavelength at millimeterwave (mmWave) frequencies enables featuring a large number of colocated antennas. This paper exploits the potential of large antenna arrays to develop a lowcomplexity directional modulation technique, Antenna Subset Modulation (ASM), for pointtopoint se ..."
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The small carrier wavelength at millimeterwave (mmWave) frequencies enables featuring a large number of colocated antennas. This paper exploits the potential of large antenna arrays to develop a lowcomplexity directional modulation technique, Antenna Subset Modulation (ASM), for pointtopoint secure wireless communication. The main idea in ASM is to modulate the radiation pattern at the symbol rate by driving only a subset of antennas in the array. This results in a directional radiation pattern that projects a sharply defined constellation in the desired direction and expanded further randomized constellation in other directions. Two techniques for implementing ASM are proposed. The first technique selects an antenna subset randomly for every symbol. While randomly switching antenna subsets does not affect the symbol modulation for a desired receiver along the main direction, it effectively randomizes the amplitude and phase of the received symbol for an eavesdropper along a sidelobe. Using a simplified statistical model, an expression for the average uncoded symbol error rate (SER) is derived as a function of the observation angle. To overcome the problem of large sidelobes in random antenna subset switching, the second technique uses an optimized antenna subset selection procedure based on simulated annealing to achieve superior performance compared with random selection. Numerical comparisons of