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Wideband

About: Wideband is a research topic. Over the lifetime, 29217 publications have been published within this topic receiving 330810 citations.


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TL;DR: The proposed channel estimator follows the typical linear-minimum-mean-square-error structure and applies for an arbitrary channel model and outperforms conventional ones as demonstrated by computer simulation results.
Abstract: In this article, we investigate channel estimation for wideband millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO) under hybrid architecture with lowprecision analog-to-digital converters (ADCs). To design channel estimation for the hybrid structure, both analog processing components and frequency-selective digital combiners need to be optimized. The proposed channel estimator follows the typical linear-minimum-mean-square-error (LMMSE) structure and applies for an arbitrary channel model. Moreover, for sparsity channels as in mmWave, the proposed estimator performs more efficiently by incorporating orthogonal matching pursuit (OMP) to mitigate quantization noise caused by low-precision ADCs. Consequently, the proposed estimator outperforms conventional ones as demonstrated by computer simulation results.

8 citations

Journal ArticleDOI
TL;DR: In this article, a four-element true-time-delay-based ADC-enabled spatial signal processor (SSP) with frequency-uniform beamforming, wideband beam-nulling, and multiple independent interference filterings using the Kronecker decomposition is presented.
Abstract: Next-generation wireless communication requires phased-array systems with large modulated bandwidths and high energy efficiency, ensuring Gb/s data communication. Conventional phase-shifter-based arrays result in frequency-dependent processing and, therefore, beam-squinting in an array. This work demonstrates a four-element 500-MHz modulated bandwidth true-time-delay-based ADC-enabled spatial signal processor (SSP) with frequency-uniform beamforming, wideband beam-nulling, and multiple independent interference filterings using the Kronecker decomposition. This processor can augment conventional phased-array RF front ends to implement a complete antenna-to-digital solution. The proposed baseband delay-compensating solution in the SSP uses scalable time-domain circuits comprising of time-interleaved voltage-to-time converters followed by asynchronous 6-bit pipeline time-to-digital converters and consumes only 40 mW with a total area of 0.31 mm2 in 65-nm CMOS technology.

8 citations

Journal ArticleDOI
01 Jan 2022-Optik
TL;DR: In this article, a stacked round hole disk absorber with plasmon resonance was designed to absorb sunlight and coincide with the standard solar spectrum, which exhibits better performance in the field of solar energy collection and conversion.

8 citations

Journal ArticleDOI
TL;DR: In this article, a U-shaped reflector is employed to introduce a new resonance and improve the front-to-back (F/B) ratio at lower band and a parasitic patch and a director are employed to enhance the performance of the antenna at upper band.
Abstract: This letter presents a design of a uniplanar ultrawideband antenna with unidirectional radiation pattern. The antenna design starts from a folded dipole. A modified U-shaped reflector is utilized to introduce a new resonance and improve the front-to-back (F/B) ratio at lower band. A parasitic patch and a director are employed to enhance the performance of the antenna at upper band. Moreover, a higher order mode of the folded dipole is excited to increase the bandwidth further using two strips which are connected to the folded dipole. A prototype is fabricated and measured. The measurements show that the antenna has a bandwidth of 85.1% (2.37–5.88 GHz), a peak gain of 6.9 dBi, and a compact size of 40 mm × 40 mm. In addition, it has the minimum F/B ratio of 10 dB across the whole passband. Due to the advantages of wideband, compact size, planar structure, and easy fabrication, the proposed antenna is suitable for various wireless communication systems.

8 citations

Journal ArticleDOI
TL;DR: In this paper, two modes corresponding to wideband acousto-optic interaction have been revealed based on the analysis of Bragg conditions and the moduli of the electric fields of the incident and diffracted light beams are calculated for one of these modes.
Abstract: Two modes corresponding to wideband acousto-optic interaction have been revealed based on the analysis of Bragg conditions. The moduli of the electric fields of the incident and diffracted light beams are calculated for one of these modes. The half-power frequency bandwidth of the control signal at a level of diffracted beam was found to be 495 MHz for the light wavelength λ0 = 632 nm at a diffraction efficiency of 2.2% on an average ultrasonic frequency of 3.27 GHz.

8 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,215
20222,826
20211,598
20202,005
20192,423