Adaptive Beamforming Antenna Research Articles

Hierarchical Networks Technology and Simulation of An Adaptive Beamforming Antenna

This paper focuses on designing and simulation of an adaptive beamforming antenna technology. This was done to ensure that the transmitted signals are beamed in a specified direction for better signal reception in the desired of specified desired stations because the problems of the weak signal emancipate if the antenna is not pointed in the right direction leading to scattering of the signals. This is to say that a beamformoing antenna radiate or receives a greater power in a specified directions allowing for increased performance and reduced interference from an unwanted sources. In order to achieve our aim, a pictorial system design of the antenna was set showing and stating the basic parameters of the systems, the transmitter, channel module, receiver module, display and control module. A practical Simulink software model without and with adaptive beamforming antenna systems were developed, tested, compared and implemented as shown in figure 1 and figure 2 respectively. Simulink model was chosen primarily for its collection of several applications specific blocks that supports different design discipline and specifically for this paper.

Total Local Dose in Hypothetical 5G Mobile Networks for Varied Topologies and User Scenarios

In this study, the total electromagnetic dose, i.e., the combined dose from fixed antennas and mobile devices, was estimated for a number of hypothetical network topologies for implementation in Switzerland to support the deployment of fifth generation (5G) mobile communication systems while maintaining exposure guidelines for public safety. In this study, we consider frequency range 1 (FR1) and various user scenarios. The estimated dose in hypothetical 5G networks was extrapolated from measurements in one of the Swiss 4G networks and by means of Monte Carlo analysis. The results show that the peak dose is always dominated by an individual’s mobile phone and, in the case of non-users, by the bystanders’ mobile phones. The reduction in cell size and the separation of indoor and outdoor coverage can substantially reduce the total dose by >10 dB. The introduction of higher frequencies in 5G mobile networks, e.g., 3.6 GHz, reduces the specific absorption rate (SAR) in the entire brain by an average of −8 dB, while the SAR in the superficial tissues of the brain remains locally constant, i.e., within ±3 dB. Data from real networks with multiple-input multiple-output (MIMO) were not available; the effect of adaptive beam-forming antennas on the dose will need to be quantitatively revisited when 5G networks are fully established.

A Nonrandom Walk Down Memory Lane With Bernard Widrow

Presents a biorgrahical and scientific discussion on the life and work of Bernard Widrow. Widrow is renowned for his work in adaptive filters and adaptive controls, adaptive beamforming, pattern recognition, adaptive neural networks, bioengineering, and adaptive geophysical imaging. Here he discusses the progression of his career to the 1970s, from working with magnetic core memory in the 1950s to developing adaptive beamforming antennas in the 1960s.

Evaluation of the Interference and Noise Suppression Capability of Uniform Linear Array Adaptive Beamforming Antenna

This paper evaluates the interference and noise suppression capability of uniform linear array adaptive beamforming antenna, at base stations of WCDMA mobile communication system. The signal-to-interference and noise ratio (SINR) was the performance index used for the evaluation and analysis. SINR was investigated for a conventional narrow band beam former by varying the number of antenna array elements, the inter-element spacing and number of interfering signals or users. The results were compared with that of omni-directional antenna. The graph obtained showed significant improvement in SINR as the number of antenna elements increases in the presence of large interferers for odd numbered array. the most common of all the array geometries employed in cellular and personal communication systems (PCS) (2), and it is the simplest to be used in investigating SINR improvement. In this paper, we provide a detailed presentation of SINR improvement ability of a ULA. In particular, we consider the effect of varying the number of antenna elements, number of interfering users and the inter-element spacing on the SINR improvement with the exclusion of mutual coupling. The performance of omni-directional antenna and adaptive antenna array were compared based on SINR maximization.

A high-speed adaptive antenna array with simultaneous multibeam-forming capability

A new type of adaptive beamforming antenna system architecture is proposed for multichannel wireless communications. Multibeam communication with high data throughput is accomplished using the proposed beamformer architecture. The system consists of analog mixers, a multitone direct digital synthesizer (DDS), and a digital signal processor (DSP) controller. The essential idea of multibeam forming is based on a multitone weighting scheme combined with analog-digital hybrid signal processing. While the real-time multibeam construction is realized by the analog mixer circuits and a DDS, the complicated adaptive beamforming and direction-of-arrival estimation algorithms are carried out by the DSP. In this architecture, only one beamformer circuit is required to handle multiple beams, leading to significant reduction in hardware counts. A 5.8-GHz eight-element adaptive beamforming array successfully demonstrates two-beam simultaneous beamforming with less than three degrees of peak and null steering errors and more than 20-dB interference suppression. The test-bed exhibits successful two-channel data recovery at 25-Mb/s data throughput in each channel with binary phase-shift keying modulation, for simultaneous dual-beam reception. The bit-error-rate measurement validates the robustness of the communication quality under strong interferences.