Buscar
Mostrando ítems 31-40 de 62
Time-Modulated Multibeam Phased Arrays With Periodic Nyquist Pulses
(Institute of Electrical and Electronics Engineers, 2018-12)
[Abstract]: We present a single sideband time-modulated multibeam phased array governed by periodic Nyquist pulsed signals. A Nyquist pulse is a physically realizable approach to the ideal sinc function. Hence, its low-pass ...
Analog Beamforming Using Time-Modulated Arrays With Digitally Preprocessed Rectangular Sequences
(Institute of Electrical and Electronics Engineers, 2018-03)
[Abstract]: Conventional time-modulated arrays are based on the application of variable-width periodical rectangular pulses (easily implemented with radio frequency switches) to the individual antenna excitations. However, ...
Time-Modulated Phased Array Controlled With Nonideal Bipolar Squared Periodic Sequences
(Institute of Electrical and Electronics Engineers, 2019-02)
[Abstract]: Bipolar (±1) sequences with no zero state suit particularly well for safeguarding the switched feeding network efficiency when applied to time-modulated arrays. During the zero state of a conventional time-modulating ...
Dual-Signal Transmission Using RF Precoding and Analog Beamforming With TMAs
(IEEE, 2018-06)
[Absctract]: Time-modulated arrays (TMAs) receiving beamforming provide a noteworthy hardware simplicity given the ability of this multi-antenna technique to transform spatial diversity into frequency diversity. However, ...
Direct Antenna Frequency-Hopped M-FSK Modulation With Time-Modulated Arrays
(Institute of Electrical and Electronics Engineers, 2024-02)
[Abstract]: We present an innovative approach that simultaneously enables direct antenna frequency-hopped M-ary frequency shift keying (DAFH-MFSK) modulation and beamsteering through the use of time-modulated arrays (TMAs). ...
TMA–FDA Range-Angle Beamforming With Periodic Linear-Phase Time-Modulating Waveforms
(Institute of Electrical and Electronics Engineers, 2022)
[Abstract]: Frequency diverse arrays (FDAs) provide range-angle time-invariant transmit–receive beamforming, although a fine focus of their radiation patterns is costly since high-resolution mixers and phase shifters are ...
Experimental Characterization of LTE Wireless Links in High-Speed Trains
(Hindawi, 2017)
[Abstract]: Multimedia and data-based services experienced a nonstopping growth over the last few years. People are continuously on the move using devices to access multimedia contents or other data-based services. Due to ...
Enhanced Time-Modulated Arrays for Harmonic Beamforming
(Institute of Electrical and Electronics Engineers, 2017)
[Abstract]: One of the primary features of time-modulated arrays (TMAs) is their ability to adapt their harmonic patterns to exploit the angular diversity of multipath wireless channels. In such a case, the TMA excitations ...
Propagation modeling for outdoor-to-indoor and indoor-to-indoor wireless links in high-speed train
(Elsevier, 2017)
[Abstract]: Nowadays telecommunication companies have shown a great interest in deploying broadband mobile wireless networks in high-speed trains (HSTs) with the aim of supporting both passenger services provisioning as ...
Measurement-Based Characterization of Train-to-Infrastructure 2.6 GHz Propagation Channel in a Modern Subway Station
(Institute of Electrical and Electronics Engineers, 2018)
[Abstract]: Channel characterization is essential when planning wireless communication deployments. We consider the wireless channel characterization in a modern subway station and its corresponding entrance tunnel, a topic ...