Results 71 to 80 of about 117,363 (337)
Adaptive array antenna design for wireless communication systems
, 2013 Adaptive array antennas use has been limited to non-commercial applications due to their high cost and hardware complexity. The implementation cost of adaptive array antennas can be kept to a minimum by using cost effective antennas, reducing the number of elements in the array and implementing efficient beamforming techniques.
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
wiley +1 more source
Noncoherent Channel Combining for GNSS Signal Tracking with an Adaptive Antenna Array
Remote SensingAdaptive antenna arrays are widely used to protect Global Navigation Satellite System (GNSS) receivers from interference. However, conventional blind anti-jamming array processing methods can cause satellite signal attenuation, which reduces signal ...
Song Li +4 more
doaj +1 more source
Undesired Radiation Suppression Technique with Adaptive Control for Distributed Array Antenna Systems in Mobile Environment [PDF]
Journal of Communications Software and Systems, 2020 We have proposed a distributed array antenna (DAA) system for high-speed satellite communications. The DAA system uses multiple small tracking antennas and combines the transmission signals in-phase to increase the antenna gain.
Hideya So, Kouhei Suzaki, Daisuke Goto
doaj
Wireless data transmission in underwater hydroacoustic environment based on MIMO-OFDM system and application adaptive algorithm at the receiver side [PDF]
Serbian Journal of Electrical Engineering, 2019 To increase the transmission speed in wireless data transmission systems, it is necessary to change either the bandwidth or the spectral efficiency, or both simultaneously.
Fedosov Valentin, Legin Andrey
doaj +1 more source
A Wideband Direct Data Domain Genetic Algorithm Beamforming [PDF]
, 2015 In this paper, a wideband direct data-domain genetic algorithm beamforming is presented. Received wideband signals are decomposed to a set of narrow sub-bands using fast Fourier transform.
Elkamchouchi, H. M., Hassan, M. M.
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A Low-Complexity Multiuser Detector for Asynchronous CDMA QPSK Adaptive Antenna Array Systems [PDF]
Wireless Networks, 2003 This paper proposes a low complexity joint space-time multiuser detection algorithm for asynchronous DS/CDMA antenna array systems. The proposed multiuser detector is composed of an adaptive antenna array, used as a linear beamformer, and a sliding window decorrelator.
DEL RE, ENRICO +3 more
openaire +2 more sources
Advanced Engineering Materials, EarlyView.Phase‐changing liquids enable untethered pneumatic actuation in soft robotics but suffer from volatility and storage challenges. This work reports a simple method to encapsulate Novec 7000 within micron‐thin alginate shells via in situ injection and ionic crosslinking.
Rayan A. M. Basodan +3 more
wiley +1 more source
The Journal of Engineering, 2019 The most challenging task in phased array radar system is the mitigation or suppression of noise and interferences to enhance the useful signal in radar received signals.
Raafia Irfan +3 more
doaj +1 more source
Hybrid MIMO Architectures for Millimeter Wave Communications: Phase Shifters or Switches?
, 2015 Hybrid analog/digital MIMO architectures were recently proposed as an alternative for fully-digitalprecoding in millimeter wave (mmWave) wireless communication systems.
Alkhateeb, Ahmed +4 more
core +1 more source