Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"3.5 GHz"”.
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… sharing and open spectrum access, the 3.5 GHz frequency band is under consideration for small cells and general Wireless Local Area Networks (WLAN) in the United States. The same band is beginning to see deployment in China, Japan, and South Korea, for the 4G Long Term Evolution (LTE) …
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Security and Performance Issues in Spectrum Sharing between Disparate Wireless Networks
… Broadband Radio Service (CRBS) in the 3.5 GHz band to enable sharing between wireless broadband devices and incumbent radar systems. This sharing will be enabled by use of geolocation database with supporting infrastructure termed as Spectrum Access System (SAS). Although using SAS for …
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Inclusion of Priority Access in a Privacy-preserving ESC-based DSA System
… rules and recommendations set forth for the 3.5 GHz Citizens Broadband Radio Service, a three-tiered structure shall govern the newly established shared wireless band. The three tiers are comprised of three different levels of spectrum access; Incumbent Access, Priority Access and General …
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Coexistence of Wireless Systems for Spectrum Sharing
… and Fixed Satellite Service (FSS) at 27.5-28.35 GHz (28 GHz); 5G and Fixed Service (FS) at 71-76 GHz (70 GHz); vehicular communications and Wi-Fi at 5.85-5.925 GHz (5.9 GHz); and mobile broadband communications and radar at 3.55-3.7 GHz (3.5 GHz). The results presented in each of the …
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Pattern reconfigurable metamaterial antenna for 5G base station network
… bands i.e. millimetre-wave (MMW) band and sub-6 GHz band for beam deflection applications. The modified double square ring resonator (DSRR) and contiguous squares resonator (CSR) structures are investigated numerically and experimentally to provide low loss property at 76 GHz and around 28 GHz, …
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Controlling coupling in an electrically steerable parasitic array
… it to synthesize an ESPAR that operates at 2.4 GHz and 3.5 GHz. These experiments help further develop a principled method of designing frequency-reconfigurable ESPARs. Since stationary base station antennas can afford to be larger and more complex, these low-profile and inexpensive antennas can …
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
… of up to 123 Ω/mW or %3.44/mW at its 3.5 GHz fundamental mode. Lastly, the results are analyzed, and potential ideas for future research based on this work are proposed.
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Improvements to Enhance The Security and Reliability of Crowdsourced Spectrum Access Systems and Cognitive Radio Networks
… Access Systems (SASs), focusing on the U.S. 3.5 GHz Citizens Broadband Radio Service (CBRS) band. A structured survey of existing regulatory frameworks, coordination methods, and interference mitigation strategies provides context for the research contributions that follow. To enhance trust in …
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A Tri-Ridged Flared Horn for Radio Astronomy Applications
… −10 dB reflection coefficient across a 1.2 − 3.5 GHz bandwidth. The mode tracking algorithm is also used for a modal analysis of the TRFH. The TRFH is designed and optimised for maximum receiving sensitivity, by using existing methods and techniques used for other antennas in radio astronomy. The …
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Digitally enhanced CMOS RF transmitter with integrated power amplifier
An energy-efficient, 3.5 GHz, direct-conversion RF transmitter with integrated 23 dBm, Class-B power amplifier (PA) is fabricated in a 0.13 μm CMOS process. The TX chip is packaged using a low-cost chip-on-board (COB) technique. When 20-MHz bandwidth OFDM signals are transmitted, a high TX average …
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Atmospheric temperature profile retrievals using 54 and 118-GHz spectral observations from the Proteus Aircraft
… observing oxygen absorption bands at 50-57 GHz and 118.75 [plus-minus] 0.8 - 118.75 [plus-minus] 3.5 GHz. NAST-M can accurately measure brightness temperatures aboard Scaled Composite's Proteus Aircraft from an altitude of 16 km. Simulating the brightness temperatures NAST-M would observe …
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A Coverage Area Estimation Model for Interference-Limited Non-Line-of-Sight Point-to-Multipoint Fixed Broadband Wireless Communication Systems
… for such systems operating within the 3.5 GHz multichannel multipoint distribution service (MMDS) band. The model is site-specific in that it uses statistical building/roof height distribution parameters obtained from practically modeling several metropolitan cities in the U.S. using …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… filter is implemented to cover 2.5 to 2.6 GHz and 3.4 to 3.7 GHz for 4G and 5G, respectively. Another design is also presented with the advantages of a wide passband of more than 1 GHz. Conversely, new and compact reconfigurable filters are designed using varactor and PIN diodes for 4G and …
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Design of New, Compact and Efficient Microstrip Filters for 5G Wireless Communications
… filter is implemented to cover 2.5 to 2.6 GHz and 3.4 to 3.7 GHz for 4G and 5G, respectively. Another design is also presented with the advantages of a wide passband of more than 1 GHz. Conversely, new and compact reconfigurable filters are designed using varactor and PIN diodes for 4G and …
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Gallium nitride MEMS resonators
… sensing of the mechanical signal when scaling to GHz frequencies, which enabled the highest frequency lithographically defined resonance reported to date in GaN (3.5 GHz). These demonstrated features sh
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Design and implementation of adaptive baseband predistorter for OFDM nonlinear transmitter. Simulation and measurement of OFDM transmitter in presence of RF high power amplifier nonlinear distortion and the development of adaptive digital predistorters based on Hammerstein approach.
… with a gain of 22 dB, operated over the 3.5 GHz frequency band was designed and implemented. The proposed baseband PD is independent of the operating RF frequency and can be used in multiband applications. Its operation is based on the Hammerstein system, taking into account PA memory effect …
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Investigation and Design of New, Efficient and Compact Load Modulation Amplifiers for 5G Base Stations. Design, Simulation, Implementation and Measurements of Radio Frequency Power Amplifiers Using Active Load Modulation Technique for More Compact and Efficient 5G Base Stations Amplifiers
… Doherty Power Amplifiers (DPA) targeting 3.3-3.5 GHz were designed and fabricated using two transistors (25 W and 45 W). In addition, more compact load modulation amplifiers targeting sub 6-GHz bandwidth of 5G specifically 3.4-3.8 GHz is discussed including the theory of implementing these …
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Implanted Antennas and Intra-Body Propagation Channel for Wireless Body Area Network
… Scientific and Medical (ISM) band and 3.5 GHz band using ECLA. It was found that the proposed ECLA has a better performance compared to the previous designs of implanted antennas. Based on our study, the MICS band has the best propagation channel inside the human body model among the …
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Digitally Assisted Transmitter Enhancement Techniques for Millimeter Wave Radio Systems
… MHz in multipole bands between 800 MHz and 3.5 GHz with digitally modulated multi-carrier transmission schemes and hybrid access schemes in time, frequency and spatial domains. The radio spectrum has stretched to occupy multiple bands below to meet the demand for volume and speed of the data to …
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Optimization and design of radio frequency piezoelectric MEMS resonators
… A high-frequency S1 resonator at 3.5 GHz with a coupling of 3.5% is fabricated and demonstrated. Chapter 6 presents a hybrid filtering topology with a mode conversion AlN S0 resonator and lumped elements for widening the bandwidths of resonator-based filters. Chapter 7 proposes lithium …
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