A5017782726- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Millimeter-Wave Propagation and Modeling
- Full-Duplex Wireless Communications
- Antenna Design and Analysis
- Electromagnetic Compatibility and Measurements
- Wireless Communication Networks Research
- Advanced Power Amplifier Design
- Vitamin D Research Studies
- Advanced MIMO Systems Optimization
- Satellite Communication Systems
- Hair Growth and Disorders
- Acne and Rosacea Treatments and Effects
- Empathy and Medical Education
- Innovations in Medical Education
- Clinical Reasoning and Diagnostic Skills
- Antenna Design and Optimization
Oregon State University
2017-2022
Cypress Semiconductor Corporation (United States)
2017
Rajasthan Dental College and Hospital
2016
Texas Instruments (United States)
2013
Indian Space Research Organisation
1978
A low-power 28-GHz phased-array receiver (RX) front end is presented that incorporates a low-noise amplifier (LNA) and passive reflection-type phase shifter (RTPS) capable of 360° shift with 5-b resolution low gain variation. Passive shifters are limited by tradeoffs between resolution, insertion loss, range. The proposed RTPS load design optimization approach leads to achieving the state-of-the-art loss range variation across shift. LNA adopts transformer-coupled neutralization architecture...
Background: Empathy plays an important role in healthy dentist and patient relationship. Hence, the aim of study is to (a) measure self-reported empathy levels among dental undergraduate postgraduate students. (b) To review trend changes level with experience, age, gender Materials Methods: This cross-sectional, questionnaire-based was carried out two private institutions situated Sri Ganganagar, India, a sample size 978. Data were obtained from 1 st final year (BDS), interns, students...
High-data-rate wireless links at mm-wave have motivated the development of scalable, dense arrays with hundreds elements [1], [2]. The evolution from "multiple-input-single-output" phased towards multibeam/MIMO presents significant challenges. Firstly, increasing number beamforming blocks and outputs to preserve signals every element increases IC area makes compact on-package signal routing challenging. This limits a scalable unit-tile approach λ/2 ×λ /2 spacing. Secondly, it is important...
A significant increase in Smartphones and tablets with embedded Wi-Fi demands a low-cost system solution. In this paper the RF core of an 802.11n 2×2 b/g band, 2×1 a-band MIMO WLAN SoC die area 3.83mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> 45nm CMOS is described. As shown Fig. 19.1.1 has integrated Power Amplifier (PA) for both bands T/R switch eliminating need expensive external Front-End Module. The LO synthesized by two-step...
The evolution of mm-wave phased array receivers (RX) to MIMO RX promises multi-beamforming and improved capacity. Although digital beamforming (DBF) provides the highest flexibility, digitization in beam space as opposed element enables ADC scalability with number beams ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\le $ </tex-math></inline-formula> 4) spatial filtering prior ADC. mm-Wave arrays must...
This paper describes a 26-GHz fully integrated In-band Full-duplex Circulator (IBFD) Receiver (RX), which employs passive and active Self-interference Cancellation (SIC) techniques in the mm-wave domain. Coverage of wireless networks at frequencies can be enhanced by deploying large number base stations economically based on Integrated Access Backhaul (IAB) relays repeaters. However, to retain channel capacity, IAB needs implemented using full-duplex schemes that suffer from strong...
Reduction in base-station deployment costs while increasing coverage has motivated Integrated Access and Backhaul (IAB) nodes mm-wave 5G NR (Fig. 14.3.1). Similarly, high path loss due to shadowing limited outdoor-to-indoor penetration at led an interest repeater/relays extend [1]. Currently, halfduplex links based on TDD (preferred for IAB), FDD, spatial, polarization-duplex are explored, targeting TX/RX isolation the cost of channel capacity. While mmwave in-band full-duplex (IBFD) with...
Recently, mm-wave multi-in multi-out (MIMO) arrays are garnering significant attention because of their ability to form multiple spatial beams, achieving significantly higher data rates compared traditional phased array-based approaches. Furthermore, scalable MIMO can provide many other functionalities, such as full digital beamforming and per-power amplifier (PA) pre-distortion. In this work, an four-element TX array architecture is presented with a frequency-domain multiplexing-based...
This Letters corrects errata in the above paper <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref> . The minimum rms phase error for RTPS stand-alone xmlns:xlink="http://www.w3.org/1999/xlink">[1, Table I]</xref> and front-end II]</xref> computed as per approach rid="ref2" xmlns:xlink="http://www.w3.org/1999/xlink">[2]</xref> (with a zero average error) are 1.5° 1.4°, respectively. measured of across frequency...
This work demonstrates a 60GHz 45nm RF-SOI 4-element scalable MIMO TX with single-wire interface (SWI) to alleviate the challenge of supporting high data-rate I/O in large-scale tiled mm-wave array. Frequency-domain multiplexing is used on single wire simultaneously support signals all 4 channels while breaking trade-off between channel-to-channel isolation and bandwidth. Harmonic-rejection mixing (HRM) demultiplex modulated from single-wire, each 2GHz bandwidth (total BW 8GHz). A novel...
Fragmented spectrum allocations at RF and mm-Wave, increased use of carrier aggregation/MIMO dense spectrum-reuse in wireless links has led to interest the design integrated wideband, high-linearity MIMO RX that provide low noise, blocker tolerance reconfigurability across signal domains.In this paper, receive architectures for wide operating range are presented with a focus on recent developments reconfigurable N-path receivers.Generalized sequence-mixing support...
Dense-aperture mm-wave MIMO RX front-ends will require simplified IF interfaces, particularly when multiple 5G NR bands must be supported. The first dual-band 28 GHz and 39 front-end with beam-space frequency-domain multiplexing (FDM) is presented that enables concurrent amplitude/phase weighted signal combining across four elements GHz/39 bands. FDM scheme places the outputs at different frequencies. IC includes local multi-phase LO generation in each element, consumes 516mW...
Multicarrier FM signal amplified by non-linear amplifiers, generate intermodulation products resulting in cross-talk, each channel. Typical examples of such amplifiers are saturated TWT constituting the vital communication equipment, both spacecraft transponder and ground segment. With international satellite services getting changed from a power-limited mode to bandwidth-limited mode, an optimum use space segment calls for utilization single 40-MHz more than one video channel...