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In this paper, we consider the joint multicast and unicast beamforming design problem in the multi-input single-output downlink wireless network, where all base stations (BSs) potentially can cooperate (as a single virtual BS) to transmit a common multicast and multiple dedicated unicast data streams at the same time on the same frequency band. To reduce cooperation overhead (among different BSs),...
Mobile devices or sensor nodes are usually energy-constrained, and in some scenarios it is inconvenient or impractical to charge or replace batteries. To tackle this problem, the idea of transferring power to mobile devices wirelessly via radio frequency signals has recently gained much attention. In this paper, we consider a point-to-point communication system in which the transferred power is used...
In this paper, we propose power allocation (PA) and jammer selection schemes based on a cooperative jamming strategy combined with a null-steering beamforming technique (CJ-NB strategy) for physical-layer security. Using the CJ-NB strategy, we first present an asymptotic optimal PA scheme, obtained by solving an achievable secrecy rate maximization problem, and then provide the corresponding achievable...
In a cellular wireless system, users located at cell edges often suffer significant out-of-cell interference. In this paper we consider a coordinated beamforming approach whereby multiple base stations jointly optimize their downlink beamforming vectors in order to simultaneously improve the data rates of a given group of cell edge users. Assuming perfect channel knowledge, we formulate this problem...
The conventional minimum variance beamformer (MVB) is known to have better resolution and much better interference rejection capability when the array steering vector is accurately known. However, the major problem of the MVB is that it lacks robustness against the unknown array steering vector errors. Therefore, diagonal loading and its extended versions have been a popular approach to improve the...
It is very important to target detecting hardware and algorithm design in the field of target tracking field. A kind of detection algorithm using SVM (support vector machine) and AdaBoost which selects representative Harr characters is proposed. SVM uses selected Harr wavelet characters as input data in training and classifying procedure. In order to accelerate SVM classify and detect speed, the cascade...
For the problem of obtaining high-resolution direction of arrival (DOA) in the case of the angularly dependent array uncertainties and non-Gaussian sources, in this paper, a new method of signal direction of arrival estimation based on high-order cumulants and a partially calibrated array (CPCA) is proposed. In this algorithm, the high-order cumulants of received signal is accounted, and the corresponding...
A new wideband signal direction of arrival estimation algorithm based perturbation method is proposed in the presence of the nonideal arbitrary sensors array and the mutual coupling between array elements. In this algorithm, the perturbation method of focusing matrix is derived in the condition of the errors of the actual element positions, gains and phases, and mutual coupling, then, the process...
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