The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper considers a method for detecting faulty elements in a linear phased array by means of set near-field probes. Using the asymptotic correspondence for two- and three-dimensional problems of the antenna theory leads to simpler mathematical models for the vertical dipoles array. A numerical study of mathematical models is based on the iterative regularization of the ill-posed problem of reconstructing...
A new combined REV calibration method for large phased array antenna is presented in this paper. This method is based on power measurement, so the measurement can reach a high stability in high frequency. It can also improve the calibration accuracy and efficiency at the same time, especially in large phased array antenna. Simulation results testify the correctness of this new method.
A novel wideband high efficiency filtantenna array for space-borne synthetic aperture radar (SAR) applications is presented. The antenna array operating bandwidth is broadened by subarray technology, in which the subarrays are excited by a ridged waveguide divider. In order to eliminate the data transmission interference on SAR, the evanescent mode waveguide filters are integrated in the divider expediently...
An element failure diagnosis method for phased array antenna is proposed. The method is based on the matrix method by solving inverse matrix to retrieve the excitations of the antenna under test. Taking advantages of the phase shift of the excitation, the receiving probe can be fixed during the measurement process to reduce positioning errors. The results have good accuracy to identify the locations...
It is necessary to study the spatial evolution of clusters in massive multiple-input multiple-output (MIMO) mobile channel, which is one of the important features in cluster-based models. In this paper, we analyze the data collected from the massive MIMO mobile measurement campaign, with a 256-element virtual array at 3.5 GHz in line of sight (LoS) and non line of sight (NLoS) conditions, respectively...
This paper presents angular characteristics for high-speed railway (HSR) channels, based on virtual single-input multiple-output (SIMO) measurements. A virtual array measurement scheme is investigated and used to generate SIMO channel impulse responses (CIRs) from single-antenna measurements in three typical HSR scenarios, including obstructed viaduct, deep cutting, and open station. According to...
Massive multiple-input multiple-output (Massive MIMO) is acknowledged as a key technology for the 5th generation (5G) of wireless communication systems, which theoretically proved to be of higher throughput, better robustness, superior spectrum- and energy- efficiency. A reliable and realistic channel model serves is the enabling foundation for practical design and testing of communication systems...
This paper presents a 32-element phased-array architecture suitable for fifth-generation (5G) communication links. A 28–32 GHz silicon core chip is designed with 4 transmit/receive elements each with 14 dB gain control, 6-bit phase control, 4.6 dB measured noise figure (NF) in the RX mode and 10 dBm output 1 dB compression point (OP1dB) in the TX mode. Eight of these chips are flipped on a low-cost...
This paper presents the experimental results relevant to a conical array formed by 216 passive array columns, each composed by 8 radiating elements, in terms of the embedded single column radiation patterns and sidelobes profile of the directive beam obtained grouping in array a suitable number of columns with an appropriate weighting function. Each step of the design is described, starting from the...
This paper describes a 28GHz CMOS direct conversion transceiver with packaged 2×4 patch antenna arrays for 5G communication. Test results show good RF performances of Rx NF 6.7dB, Maximum Tx EIRP 31.5dBm (1PA Pout_sat =10.5dBm), LO integrated phase noise −37.8dBc (0.67°), Rx/Tx EVM around 2.2% (−33.1dB) at mid RF power, and well-fitted beam control capability.
This paper introduces a real-time multiple input and multiple output (MIMO) channel sounder to measure the vehicle-to-vehicle (V2V) propagation channel at 5.9 GHz. Compared to the existing V2V channel sounders, our design emphasizes on improving the stability of the setup and increasing the MIMO snapshot rate. The system stability allows us to develop a high resolution parameter extraction algorithm...
A method for the array characterization from Near-Field measurements is here presented. The method exploit the concept of Singular-Value Optimization to dramatically reduce the number of data needed by a complete mapping of the excitations. The approach is here applied to a planar scanning and numerically validated.
Communications with satellites in deep space require large antenna aperture systems on the ground in order to receive and transmit data at the power levels necessary to establish a link. However, these large antenna structures are costly to build and maintain and represent single point failure systems which can result in potential loss of mission critical data. An alternative to this approach, presently...
This paper shows the variation of clusters with the increasing number of antennas. The data was collected from the massive MIMO mobile measurement at 3.5 GHz, in line of sight (LoS) and non line of sight (NLoS) conditions, respectively. And the virtual measurement method is used to form the 64-element, 128-element and 256-element virtual antenna array from the 32-element antenna array. After estimating...
The aim of this contribution is to discuss the application of a failure detection and sparse recovery technique to a very large isophoric sparse array proposed for satellite communications. Accurate numerical results will show that the sparsity of the source is beneficial to the failure detection process, and a limited number of sensor can be used for the online detection of the failures and correction...
In this paper we discuss the feasibility of an online failure detection algorithm for large linear arrays for massive MIMO applications. By means of a numerical optimization of the position of few near field probes, a good failure detection performance has been verified.
Historically, antenna designs have been dictated by specific performance requirements for gain, beamwidth, return loss, etc. without consideration of the environment the antenna is being deployed in. Herein, we consider an over-the-air (OTA) approach for characterizing antenna performance for a wireless device arbitrarily deployed in a cluttered environment, e.g., a machine-to-machine (M2M) installation...
Cumulative distribution functions (CDFs) for multiple-input-multiple-output (MIMO) capacities are computed for flat-fading indoor channels at 5.8 GHz. These CDFs are based on two measured channels and on reconstructions of the MIMO channels from path parameters that are estimated based on measured data. The measured data was obtained using the stepped-frequency method of channel sounding in combination...
Radarsat is a Canadian Synthetic Aperture Radar (SAR) system which will provide continually updated and global sea ice, geological, land and forest resource management data [1]. The first satellite will be launched in 1995.
This work examines the behavior of a two- element sea water antenna array. A basic transmission formulation is introduced first to understand the mechanisms of the sea water phased array antenna. We then present a brief overview of phased array theory, followed by a discussion of the design and resulting measurements. Numerical simulations are compared to measured data to show the generation of sum...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.