Search · four archives
Search · four archives
15 papers · ranked by Valyu relevance
Rui Liang, Hui Li, Yingli Dong, Guodong Xue + 2 more
'Luca Barletta'] The practical implementation of massive multi-user multi-input-multi-output (MU-MIMO) downlink communication systems power amplifiers that are energy efficient; otherwise, the power consumption of the base station (BS) will be prohibitive. Constant envelope (CE) precoding is gaining increasing interest…
Zheyu Wu, Ya‐Feng Liu, Bo Jiang, Yu‐Hong Dai
Quantized constant envelope (QCE) precoding, a new transmission scheme that only discrete QCE transmit signals are allowed at each antenna, has gained growing research interests due to its ability of reducing the hardware cost and the energy consumption of massive multiple-input multiple-output (MIMO) systems. However…
Zheyu Wu, Jiageng Wu, Wei‐Kun Chen, Ya‐Feng Liu
The work of Zheyu Wu and Ya-Feng Liu was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 12288201, Grant 12022116, and Grant 11991021. The work of Wei-Kun Chen was supported in part by the NSFC under Grant 12101048 and Beijing Institute of Technology Research Fund Program for…
Ferhad Askerbeyli, Wen Xu, Josef A. Nossek
RZF Precoder Authors: ['Ferhad Askerbeyli' 'Wen Xu' 'Josef A. Nossek'] Abstract—Feeding power amplifiers (PAs) with constant envelope (CE) signals is an effective way to reduce the power consumption in massive multiple input multiple output (MIMO) systems. The nonlinear distortion caused by CE signaling must be…
Zhu Yiming, Zhu, Zhuhong, Xu XiaoDong + 3 more
—Orthogonal frequency division multiplexing (OFDM) is widely adopted in modern wireless communication systems, but its power efficiency is limited by high envelope fluctuations. Although various high power-efficiency waveforms have been proposed, most are incompatible with the cyclicprefixed orthogonal frequency…
Andrei Stefan Nedelcu, Fabian Steiner, Gerhard Kramer, Syed A. Jafar
Downlink precoding is considered for multi-path multi-input single-output channels where the base station uses orthogonal frequency-division multiplexing and low-resolution signaling. A quantized coordinate minimization (QCM) algorithm is proposed and its performance is compared to other precoding algorithms including…
David G. Felton, David A. Hague
—This paper investigates the radar Ambiguity Function (AF) properties of Constant Envelope Orthogonal Frequency Division Multiplexing (CE-OFDM) waveforms employing Phase-Shift Keying (PSK). The CE-OFDM is in fact a special case of the Multi-Tone Sinusoidal Frequency Modulated (MTSFM) waveform which allows for applying…
Mingxing Fu, Defu Jiang, Kanghui Jiang, Yiyue Gao + 1 more
In this paper, we propose an orthogonal frequency-division multiplexing (OFDM) weight design mechanism aimed at reducing envelope fluctuations under subcarrier constraints. In the time domain, a new metric is introduced and minimized to guide the OFDM waveform toward a constant-envelope structure. In the frequency…
Hafsa Farooqi, Jerrold L. Vitek, David Escobar Sanabria
Precise neuromodulation systems are needed to identify the role of neural oscillatory dynamics in brain function, and to advance the development of electrical stimulation therapies tailored to each patient’s signature of brain dysfunction. Low-frequency, local field potentials (LFPs) are of increasing interest for the…
Yiming Liu, Wei Yu
The presence of interfering scatterers fundamentally changes the design principle for MIMO sensing. Unlike the target-only case, where MIMO sensing sequence design reduces to optimizing the transmit sample covariance, this paper shows that scatterer-induced signal-dependent interference makes the Bayesian Fisher…
Mikhail Bakulin, Taoufik Ben Rejeb, Vitaly Kreyndelin, Denis Pankratov + 2 more
In modern (5G) and future Multi-User (MU) wireless communication systems Beyond 5G (B5G) using Multiple-Input Multiple-Output (MIMO) technology, base stations with a large number of antennas communicate with many mobile stations. This technology is becoming especially relevant in modern multi-user wireless sensor…
Giulio Ruffini
Hierarchical encoding is a structural element of the Free Energy Principle and related information-centric accounts of brain function, but a concrete circuit-level mechanism for it remains elusive. Here we examine Hierarchical Amplitude Modulation (HAM). In this computationally grounded scheme, information is encoded…
Eito Kurihara, Hideki Ochiai
—We address a design of high-capacity and lowpeak-to-average power ratio (PAPR) orthogonal frequencydivision multiplexing (OFDM) systems based on bit-interleaved coded modulation (BICM) utilizing non-equiprobable and nonuniform (NENU) constellations as well as clipping and filtering (CAF). The proposed constellations…
S. Souffi, L. Varnet, M. Zaidi, B. Bathellier + 2 more
Humans and animals constantly face challenging acoustic environments such as various background noises restricting the detection, discrimination and identification of behaviorally salient sounds. Here, we disentangled the role of temporal envelope tracking on the decrease in neuronal and behavioral discrimination…
Adèle Simon, Adrian N. L. Sahani, Maria Chait, Jennifer F. Linden
Human brain activity tracks slow fluctuations in continuous sound, including speech, and modelling this relationship provides insight into how the brain encodes naturalistic auditory input. Traditional approaches to modelling the tracking of speech in the brain with linear regression often use the amplitude envelope of…