Search Results - "Brégains, Julio"

Enhanced Time-Modulated Arrays for Harmonic Beamforming by Maneiro-Catoira, Roberto, Bregains, Julio C., Garcia-Naya, Jose A., Castedo, Luis

“…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…”
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Time-modulated array beamforming with periodic stair-step pulses by Maneiro-Catoira, Roberto, Brégains, Julio, García-Naya, José A., Castedo, Luis

“…Time-modulated arrays (TMAs) are able to improve the side-lobe level of the radiation pattern at the fundamental mode but cannot steer the beam at such a mode…”
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Performance Analysis of Time-Modulated Arrays for the Angle Diversity Reception of Digital Linear Modulated Signals by Maneiro-Catoira, Roberto, Bregains, Julio C., Garcia-Naya, Jose A., Castedo, Luis, Rocca, Paolo, Poli, Lorenzo

“…Diversity occurs whenever several copies of the same transmitted signal arrive at a receiver. Such a situation allows for improving the performance of a…”
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Time-Modulated Phased Array Controlled With Nonideal Bipolar Squared Periodic Sequences by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…Bipolar (<inline-formula><tex-math notation="LaTeX">\pm</tex-math></inline-formula> 1) sequences with no zero state suit particularly well for safeguarding the…”
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Time Modulated Arrays: From their Origin to Their Utilization in Wireless Communication Systems by Maneiro-Catoira, Roberto, Brégains, Julio, García-Naya, José A, Castedo, Luis

“…Time-modulated arrays (TMAs) are electromagnetic systems whose radiated power pattern is controlled by the application of variable-width periodical pulses to…”
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On the Feasibility of Time-Modulated Arrays for Digital Linear Modulations: A Theoretical Analysis by Maneiro-Catoira, Roberto, Bregains, Julio C., Garcia-Naya, Jose A., Castedo, Luis

“…Wireless communications are widely based on linear digital modulation methods, which introduce the digital baseband information in the amplitude and/or in the…”
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Dual-Beam Steerable TMAs Combining AM and PM Switched Time-Modulation by Maneiro-Catoira, Roberto, Brégains, Julio, García-Naya, José A, Castedo, Luis

“…Wireless sensor networks (WSN) are increasingly requiring directional antennas that not only provide higher capacity, security, transmission range or…”
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Directional Modulation With Artificial-Noise Injection Into Time-Modulated Arrays by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…We propose a novel approach to directional modulation (DM) in time-modulated arrays (TMAs) that simultaneously radiates the information signal over a sum…”
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Direct Antenna Frequency Hopped M-FSK Modulation with Time-Modulated Arrays by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…We present an innovative approach that simultaneously enables direct antenna frequency hopped M-ary frequency shift keying (DAFH-MFSK) modulation and…”
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Time-Modulated Multibeam Phased Arrays With Periodic Nyquist Pulses by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose Antonio, Castedo, Luis

“…We present a single sideband time-modulated multibeam phased array governed by periodic Nyquist pulsed signals. A Nyquist pulse is a physically realizable…”
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Combining Switched TMAs and FDAs to Synthesize Dot-Shaped Beampatterns by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…The application of frequency offsets to the elements of a conventional phased array with variable phase shifters (VPSs) leads to frequency diverse arrays…”
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Impact of Time-Modulated Arrays on the BER of Linear Digital Modulations by Maneiro-Catoira, Roberto, Brégains, Julio, García-Naya, José A., Castedo, Luis

“…Time modulation provides a simple way to control the power radiation pattern of an antenna array. By appropriately selecting the parameters of a Time-Modulated…”
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Multibeam Single-Sideband Time-Modulated Arrays by Maneiro-Catoira, Roberto, Garcia-Naya, Jose A., Bregains, Julio, Castedo, Luis

“…The design of efficient time-modulated arrays (TMAs) for multi-beam steering purposes must be based on both a type of periodical sequences that guarantees an…”
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Direct Antenna Frequency Hopping and Beamsteering with Time-Modulated Arrays by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…In this work, we present an innovative approach to jointly perform direct antenna frequency hopping (DAFH) and beam steering using time-modulated arrays…”
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Analog Beamforming with Single-Sideband Sub- Time- Modulated Arrays by Maneiro-Catoira, Robertso, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…Switched TMAs are especially attractive in terms of efficiency either to exploit the fundamental mode improving the sideband lobe level of a given static…”
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Time Modulated Array Controlled by Periodic Pulsed Signals by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…During the last years, time-modulated array (TMA) architectures have been considering different switching network designs, focusing primarily on the radiation…”
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Multiple Beamforming with TMAs controlled by Periodic Nyquist Pulsed Signals by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…TMAs are able to provide beamforming of multiple power data stream patterns by applying periodic pulses to the antenna elements. The effectiveness of the…”
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Beam-Steering in Switched 4D Arrays Based on the Discrete Walsh Transform by Maneiro-Catoira, Roberto, Avele, Marc Bernice Angoue, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…4D arrays provide cost-effective beam steering capabilities considering radio-frequency switches (controlled by periodic sequences) instead of variable phase…”
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Frequency-Domain synthesis of time-modulated arrays by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…We address the design of Time-Modulated Arrays (TMAs) excitations in the frequency domain. The design is based on the particular features of the spectrum of…”
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Time-modulated arrays for digital communications by Maneiro-Catoira, Roberto, Bregains, Julio, Garcia-Naya, Jose A., Castedo, Luis

“…Time-Modulated Arrays (TMAs) are an example of adaptive arrays that support radiation power pattern reconfigurability attractive for transmitting both analog…”
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