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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27 Jun 2020
TL;DR: In this paper, a detection algorithm is improved based on the compressed sensing recovery algorithm SWOMP for the sparse characteristics of GSM signals, and the performance of the proposed algorithm is closer to the ML algorithm, which is a better way that balance between complexity and detection performance.
Abstract: For the generalized spatial modulation in the underdetermined system with the number of transmitting antennas larger than the number of receiving antennas, the activation of the antenna is small and inaccurate. The traditional MMSE algorithm and the ZF algorithm still perform the pseudo-inverse operation on the entire channel matrix, which results in a large number of redundancy. Although the ML algorithm has the best detection performance, the complexity is difficult to meet the actual requirements. In this paper, for the sparse characteristics of GSM signals, a detection algorithm is improved based on the compressed sensing recovery algorithm SWOMP. The algorithm first selects multiple or one active antenna sequences conforming to the spatial modulation to form an index set according to the situation, and then uses the backtracking principle to select the atomic column according to the threshold, rejects the unreliable sequence, and finally uses the minimum mean square error algorithm to detect the modulation symbol according to the activated antenna index. The pseudo-inverse operation of the entire channel matrix is avoided, and the bit error rate is lower than the ZF algorithm, the MMSE algorithm and the OMP algorithm, and the performance of the proposed algorithm is closer to the ML algorithm, which is a better way that balance between complexity and detection performance.
TL;DR: In this article, an active antenna element consisting of FET oscillators integrated with notch antennas has been used to create a 3 × 3 quasi-optical power combining array, which has a good power combining efficiency and a well defined main beam.
Abstract: Active antenna elements consisting of FET oscillators integrated with notch antennas have been used to create a 3 × 3 quasioptical power combining array. The array has a good power combining efficiency and a well-defined main beam. The design of the FET active notch antenna element and the performance of the 3 × 3 array are discussed. © 1995 John Wiley & Sons, Inc.
Patent•
14 Mar 2016
TL;DR: In this paper, a remote control apparatus (16) comprises an antenna for radio communication with the drone, and a touch screen displaying an image captured by the camera of the drone.
Abstract: The remote control apparatus (16) comprises an antenna for radio communication with the drone, and a touch screen (20) displaying an image captured by the camera of the drone. The method comprises the steps of: a) determination of the active antenna (28b); b) determining the model of the apparatus used; c) searching a table of a control application software, a relative orientation information of the active antenna relative to the body of the apparatus; d) displaying the image on the touch screen so that the top of a scene captured by the camera appears drone (A) to the user at the bottom of the screen (20) if the orientation of the antenna with respect to the apparatus body does not correspond to the direction (D) of the drone, and displayed (B) to the user at the top of the screen (20) if the orientation of the antenna relative the body of the apparatus corresponds to the direction (D) of the drone, to produce an unnatural display (a) leading the user to return the device (a '), placing the antenna in the direction (D) of the drone.
26 Jul 2014
TL;DR: A multi-channel phased signal generator with robust and extensible automatic synchronization network is presented in this work to meet the ever increasing demand for the mixed signal based active antenna array.
Abstract: A multi-channel phased signal generator with robust and extensible automatic synchronization network is presented in this work to meet the ever increasing demand for the mixed signal based active antenna array. The proposed generator architecture possesses high flexibility of building up the scalable active antenna system and is validated by the experimental results of a prototype. Furthermore, its application in receiving antenna system is demonstrated. An effective phase resolution of 0.1° and a corresponding beam steering step in sub-degree level are achieved.
Patent•
14 Mar 2017
TL;DR: In this article, an antenna device includes: an antenna array configured to radiate or receive an electromagnetic wave signal; a feed network configured to connect the antenna array and a signal multiplexer; at least one signal multi-xer configured to divide one path of a signal from the feed network into at least two paths of the signal, or combine at least 2 paths of an antenna to one path and transmit the one path from the antenna to the network.
Abstract: An antenna device includes: an antenna array configured to radiate or receive an electromagnetic wave signal; a feed network configured to connect the antenna array and a signal multiplexer; at least one signal multiplexer configured to divide one path of a signal from the feed network into at least two paths of a signal, or combine at least two paths of a signal to one path of a signal and transmit the one path of a signal to the feed network; and at least two interface modules connected to an active module and configured to receive a signal sent from the passive module or the active module, or send a signal to the active module. The antenna device can be used for sharing the antenna array and other parts in the active antenna systems.