Results 151 to 160 of about 1,142,708 (193)

Multiuser Massive Mimo Downlink Precoding Using Second-Order Spatial Sigma-Delta Modulation

IEEE International Conference on Acoustics, Speech, and Signal Processing, 2020
Massive MIMO using low-resolution digital-to-analog converters (DACs) at the base station (BS) is an attractive downlink approach for reducing hardware overhead and for reducing power consumption, but managing the large quantization noise effect is a ...
Mingjie Shao, Wing-Kin Ma, A. L. Swindlehurst   +2 more
semanticscholar   +1 more source

Digitalized Radio over Fiber Network-Based Sigma Delta Modulation

Fiber and integrated optics (Print)
Digital Radio over Fiber (DRoF) technologies end up being the most often used option for the backbone of Wide Area Networks (WAN). The main goal of this paper is to evaluate a DRoF scheme called Sigma Delta Radio over Fiber (SDRoF).
Hasan k. Al Deen, Haider J. Abd
semanticscholar   +1 more source

Spatial Sigma-Delta Modulation for Few-Bit MIMO Precoding: Quantization Error Suppression According to Channel State Information

European Signal Processing Conference
In this paper we consider a spatial Sigma-Delta ($\Sigma \Delta$) modulator design for massive MIMO downlink precoding with few-bit digital-to-analog converters (DACs).
Wai-Yiu Keung, Wing-Kin Ma
semanticscholar   +1 more source

Digital Filters for Sigma-Delta Modulation in Wireless Communications

International Semiconductor Conference, 2019
This paper presents the effect of digital filtering in a sigma-delta modulation (SDM) used in wireless communications. SDM is widely used in digital-to-analog conversion because it offers high signal to noise ratio and distortion rate and low power and ...
I. Pirnog, I. Marcu, A.M.C. Drãgulinescu, C. Oprea   +3 more
semanticscholar   +1 more source

Higher order 1-bit Sigma-Delta modulation on a circle

International Conference on Sampling Theory and Applications, 2019
Manifold models in data analysis and signal processing have become more prominent in recent years. In this paper, we will look at one of the main tasks of modern signal processing, namely, at analog-to-digital (A/D) conversion in connection with a simple
Olga Graf, Felix Krahmer, S. Krause-Solberg   +2 more
semanticscholar   +1 more source

EER power amplifier modulator efficiency improvement using PWM with additional sigma-delta modulation

2018Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), 2018
The article deals with the problem of increasing the efficiency of EER transmitters. The results of computer simulation of the EER power amplifier using transistors made by common MOSFET and advanced GaN technology in the form of graphs: the dependence ...
A. O. Bolotov, R. G. Kholyukov, O. Varlamov   +2 more
semanticscholar   +1 more source

One-bit Sigma-Delta modulation on the circle

Advances in Computational Mathematics, 2019
Manifold models in data analysis and signal processing have become more prominent in recent years. In this paper, we will look at one of the main tasks of modern signal processing, namely, at analog-to-digital (A/D) conversion in connection with a simple
Olga Graf, Felix Krahmer, S. Krause-Solberg   +2 more
semanticscholar   +1 more source

A Wireless Fiber Photometry System Based on a High-Precision CMOS Biosensor With Embedded Continuous-Time $\Sigma \Delta$ Modulation

IEEE Transactions on Biomedical Circuits and Systems, 2018
Fluorescence biophotometry measurements require wide dynamic range (DR) and high-sensitivity laboratory apparatus. Indeed, it is often very challenging to accurately resolve the small fluorescence variations in presence of noise and high-background ...
M. N. Khiarak, E. Martianova, Cyril Bories, S. Martel, Christophe D. Proulx, Yves De Koninck, B. Gosselin   +6 more
semanticscholar   +1 more source

Spatial Sigma-Delta Modulation for the Massive MIMO Downlink

Asilomar Conference on Signals, Systems and Computers, 2019
In massive MIMO, replacing high-resolution ADCs/DACs with low-resolution ones has been deemed as a potential way to significantly reduce the power consumption and hardware costs of massive MIMO implementations.
Mingjie Shao, Wing-Kin Ma, Qiang Li, A. L. Swindlehurst   +3 more
semanticscholar   +1 more source

Scintillator-specific optimization of 2-bit sigma-delta modulation A/D for gamma-ray pulse waveform capture

Optical Engineering + Applications, 2018
Scintillator-based gamma-ray detectors convert gamma-ray photons into a burst of scintillation photons, and then into a pulse-shaped electrical signal. By digitizing the pulse waveform, analyses that require information about the shape of the pulse can ...
Maria Ruiz-Gonzalez, L. Furenlid
semanticscholar   +1 more source