Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
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15 Apr 2018
TL;DR: This work focuses on the previously unaddressed problem of determining the optimal downtilt weight vectors for the antenna ports in each cell of a multi-cell multi-user system and obtains quasi-optimal weight vectors through the application of semi-definite relaxation and Dinkelbach's method.
Abstract: The 3GPP Release-13 has recently introduced full-dimension multiple-input multiple-output (FD-MIMO) technology as a practical way to deploy massive MIMO arrays within feasible base station (BS) form factors through the use of active antenna systems with two-dimensional (2D) planar array structures. The 2D arrangement of antenna elements, where the elements in each antenna port are fed with downtilt weights, allows for adaptive electronic beamforming in the elevation as well as the conventional azimuth dimensions. This work focuses on the previously unaddressed problem of determining the optimal downtilt weight vectors for the antenna ports in each cell of a multi-cell multi-user system. The optimization criterion is to maximize the minimum signal to intra-cell interference ratio within a cell while constraining the inter-cell interference leakage. The quasi-optimal weight vectors are obtained through the application of semi-definite relaxation and Dinkelbach's method. The proposed algorithm performs better than the existing approximate schemes even under the effects of pilot contamination.
3 citations
TL;DR: In this paper, a transmission double-line, with low attenuation and low voltage standing wave ratio (VSWR), was designed and manufactured for the calibration of X-band active phased-array antennas.
Abstract: A transmission double-line, with low attenuation and low voltage standing wave ratio (VSWR) for the calibration of X-band active phased-array antennas, was designed and manufactured. The transfer function from a fed element of active phased-array antennas to the double-line was measured. The transmission double-line is used to monitor and correct the element phase error of an active phased-array antenna. Radiation patterns before compared to after calibration show that the approach is useful.
3 citations
Patent•
31 Mar 2010TL;DR: In this paper, an active antenna array for a mobile communications system is disclosed which comprises a plurality of receive paths in which an individual one of the receive paths is connected between an antenna element and an analogue-to-digital converter and wherein the analogue to digital converter digitises a receive signal to form a digitised receive signal.
Abstract: An active antenna array for a mobile communications system is disclosed which comprises a plurality of receive paths in which an individual one of the receive paths is connected between an antenna element and an analogue to digital converter and wherein the analogue to digital converter digitises a receive signal to form a digitised receive signal. The active antenna array further comprises a sounding signal generator for generating a sounding signal in which the sounding signal is supplied to at least two of the plurality of receive paths and a receive signal subtraction device for subtracting a wanted signal from the digitised receive signal.
3 citations
TL;DR: In this paper, a force sensor using a quartz resonator was applied to an artificial active antenna built into an AAF, and various environments were recognized using the antenna, and the result of the recognition confirmed that the resonator is useful as a sensor to acquire information about the contact.
3 citations
TL;DR: In this article, a simple method for the calculation of the frequency and power variation of an active antenna operated in the presence of a reflecting surface is presented, which accounts for interdependent amplitude and phase dynamics and also allows for the extraction of active antenna array coupling coefficients.
Abstract: This paper presents a simple method for the calculation of the frequency and power variation of an active antenna operated in the presence of a reflecting surface. The situation modeled accounts for interdependent amplitude and phase dynamics and also allows for the extraction of active antenna array coupling coefficients. Analytical and experimental results are presented for both frequency and power variations of an individual element when operated in a strongly coupled imaged array environment. Here the nearest neighbor coupling is shown to be the dominant coupling mechanism. >
3 citations