A novel adaptivealgorithm for an array using directional elements called a hybrid smart antenna system is proposed. The algorithm controls the element patterns on the basis of an objective function composed of eigenv...
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A novel adaptivealgorithm for an array using directional elements called a hybrid smart antenna system is proposed. The algorithm controls the element patterns on the basis of an objective function composed of eigenvalues of a covariance matrix. A high and stable array output signal-to-interference-plus-noise ratio is achieved by improving both the received powers and the spatial correlation coefficient between incident waves, without prior knowledge such as directions-of-arrival, channel state information or training signals. The characteristics of the proposed algorithm are theoretically and numerically clarified for a simple case involving two incident waves. Convergence with least mean squares algorithm is found to be as fast as that with recursive least squares algorithm in this system. Also, simulation for statistical performance evaluation is carried out in comparison with a conventional system. Furthermore, a method to implement the proposed eigenspace control algorithm without having to solve the eigenvalue problem is shown.
In this paper, an adaptive array algorithm is presented to minimize linear crosstalk in high-speed WDM systems. The algorithm is based an the optimum and the decision-directed algorithm added to the test Signal sequen...
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In this paper, an adaptive array algorithm is presented to minimize linear crosstalk in high-speed WDM systems. The algorithm is based an the optimum and the decision-directed algorithm added to the test Signal sequences and sampling process;In transmitting data, the speed of algorithm processing reaches that of transmittance by a sampling process. (C) 1999 John Wiley & Sons, Inc.
This paper concerns the use of adaptivearrays in mobile communication for reducing co-channel interference, thereby increasing the channel capacity. Methods for optimal combining of the antenna outputs are discussed....
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ISBN:
(纸本)0780357434
This paper concerns the use of adaptivearrays in mobile communication for reducing co-channel interference, thereby increasing the channel capacity. Methods for optimal combining of the antenna outputs are discussed. An improved algorithm for the adaptivearrays is proposed. A preliminary simulation study is presented.
The goal of algorithms for joint beamforming and power control in communication systems with antenna arrays is to minimize the transmission power while keeping the signal-to-interference-plus-noise ratio (SINR) above ...
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The goal of algorithms for joint beamforming and power control in communication systems with antenna arrays is to minimize the transmission power while keeping the signal-to-interference-plus-noise ratio (SINR) above a minimum acceptable level. To meet this goal, one appealing approach is to first use a training sequence to adaptively obtain the beamforming coefficients and then, in a second step, to update the transmission power. However, such a power update often changes the beamforming scenario abruptly, leading to a nonstationary behavior that may greatly impair the performance of the adaptive beamforming algorithm. To overcome this problem, a novel approach for joint beamforming and power control is proposed here. Such an approach is based on a continuous iterative update of the transmission power that allows controlling the undesirable nonstationary behavior of the beamforming scenario, thereby significantly improving the performance of the joint beamforming and power control. Simulation results are shown aiming to confirm the effectiveness of the proposed approach. (C) 2016 Elsevier Inc. All rights reserved.
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