- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 10th International Conference on Wireless Communications and Signal Processing (WCSP) - Hangzhou, China (2018.10.18-2018.10.20)] 2018 10th International Conference on Wireless Communications and Signal Processing (WCSP) - Privacy Protection via Beamforming Optimization in MISO NOMA Networks
摘要： Non-orthogonal multiple access is a promising approach for 5G. However, the privacy between users may be compromised due to the superposition of all users’ signals to successive interference cancellation (SIC) receivers. In this paper, we propose a scheme based on beamforming optimization for the downlink NOMA that can enhance the security of a speci?c private user while guaranteeing other users’ quality of service (QoS). Speci?cally, we intend to maximize the secrecy rate of the private user, under the constraint that the other users’ QoS is satis?ed. Owing to the non-convexity, we ?rst convert it into convex forms and then, an iterative algorithm based on the concave-convex procedure is proposed to attain their solutions. Extensive simulation results are presented to evaluate the effectiveness of the proposed scheme.
关键词： privacy protection,beamforming optimization,physical layer security,Non-orthogonal multiple access
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Base Station Antenna Array with Calibration Structure
摘要： The introduction of 5G technologies is pushing research in mobile communications to millimeter waves. However, sub-6 GHz frequency range as a part of the 5G standard provides excellent wave propagation properties and more capacity due to new usable frequency ranges. This paper introduces a design for picocell base station 2x2 antenna array with integrated signal injection network for transceiver calibration. Operation frequency range is from 2 to 6 GHz. The antenna array with calibration board has better than -6.3 dB active reflection coefficient and efficiency higher than -3 dB. Calibration network provides 29 dB coupling.
关键词： sub-6 GHz,Base station,calibration network,mobile communications,beamforming
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Synchronization of Multiple Independent Sub-Array Antennas for IoT applications
摘要： In this paper we present a new technique to synchronize multiple individual unsynchronized sub-array antenna systems to form one large aperture array antenna system. The proposed technique synchronizes the time and the frequency of the different sub array antenna systems, using a joint Maximum Likelihood (ML) optimization for a data aided received signal, while the phase coherency between the sub arrays is achieved using a combination of least mean square (LMS) and ML algorithms. The experimental results show that the proposed technique is stable in estimating the global array antenna pattern and converges within the ?rst 50 samples of the received data.
关键词： ML algorithm,pattern beamforming,array signal processing,LMS algorithm,IoT Localization,Angle of Arrival estimation AoA,adaptive array antenna systems
更新于2025-09-04 15:30:14
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Enhance contrast in PCA based beamformers using smoothing kernel
摘要： The contrast and resolution have trade-off in medical ultrasound imaging. Most of adaptive beamformer can enhance the imaging resolution significantly but not improve the contrast at the same time. The principal component analysis (PCA) based beamformers such as the eigenspace-based minimum variance (ESBMV) beamformer provide a good imaging resolution. Neighbors of the focal point include the common noise, interface and signal components. Echo signal of the neighbor points can be used to suppress the noise and extract the signal component of the focal point. Based on this idea, in order to improve the quality of PCA based beamformers both in the imaging contrast and resolution, a novel beamforming method is proposed. This proposed beamformer utilizes a kernel to select neighbor points. The number of eigenvectors is estimated by using any PCA method. Then the number of selected eigenvectors for each focal point is compared with the number of selected eigenvectors of its neighbor points and is changed to a new value. The selected eigenvectors of the covariance matrix is used to construct the signal subspace. The estimated signal subspace is projected onto the minimum variance (MV) weight vector to calculate the desire weight vector. Results of experiments show that the proposed beamformer can improve the imaging contrast significantly while keeping the resolution quality similar to ESBMV beamformer.
关键词： eigenvalue,beamforming,Ultrasound imaging,minimum variance
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Novel Electronically Wideband Steering System using Rotman Lens for 5G Applications at 28 GHz
摘要： this paper presents the design, simulation and measurement results for a beam steerable system, which covers the frequency range from 22 GHz to 35 GHz for 5G applications. A Rotman Lens with five input ports and six output ports is the beamforming network that is connected to a six circular patch L-shaped reflector antennas. This novel system covers a wide scanning angle from -45 to +45 degree for all frequencies. In addition, the simulated and measured results show that the Rotman Lens fed-antenna array has the S11 response less than 10dB in the frequency range of 22 to 35 GHz.
关键词： Beamforming,steering system,Rotman Lens,5G,array antenna
更新于2025-09-04 15:30:14
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Hybrid Beamforming Design for Full-Duplex Millimeter Wave Communication
摘要： Harnessing the abundant availability of spectral resources at millimeter wave (mmWave) frequencies is an attractive solution to meet the escalating data rate demands. Additionally, it has been shown that full-duplex (FD) communication has the potential of doubling the bandwidth efficiency. However, the presence of significant residual self-interference (SI), which is especially more pronounced at mmWave frequencies because of the non-linearities in the hardware components, erodes the full potential of FD in practice. Conventionally, the residual SI is canceled in the baseband using digital processing with the aid of a transmit precoder. In this work, we propose a hybrid beamforming design for FD mmWave communications, where the SI is canceled by the joint design of beamformer weights at the radio-frequency (RF) and the precoder as well as combiner in the baseband. Our proposed design preserves the dimensions of the transmit signal, while suppressing the SI. We demonstrate that our joint design is capable of reducing the SI by upto 30 dB, hence performing similarly to the interference-free FD system while being computationally efficient. Our simulation results show that the proposed design significantly outperforms eigen-beamforming.
关键词： Beamforming,Millimeter Wave,Hybrid Precoding,MIMO,Full-Duplex
更新于2025-09-04 15:30:14