Search · four archives
Search · four archives
16 papers · ranked by Valyu relevance
Shuowen Zhang, Rui Zhang, Teng Joon Lim
Constant envelope (CE) precoding is an appealing transmission technique, which enables highly efficient power amplification, and is realizable with a single radio frequency (RF) chain at the multiantenna transmitter. In this paper, we study the transceiver design for a point-to-point multiple-input multiple-output…
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…
Saif Khan Mohammed, Erik G. Larsson
We consider downlink precoding in a frequency-selective multi-user Massive MIMO system with highly efficient but non-linear power amplifiers at the base station (BS). A low-complexity precoding algorithm is proposed, which generates constant-envelope (CE) signals at each BS antenna. To achieve a desired per-user…
Sudarshan Mukherjee, Saif Khan Mohammed
—We consider downlink precoding in a frequencyselective multi-user massive MIMO system with highly efficient but non-linear power amplifiers at the base station (BS). A lowcomplexity precoding algorithm is proposed, which generates constant-envelope (CE) transmit signals for each BS antenna. To avoid large variations…
Shuowen Zhang, Rui Zhang, Teng Joon Lim
—Constant envelope (CE) precoding is an appealing transmission technique which enables the realization of high power amplifier (PA) efficiency. For CE precoding in a singleuser multiple-input single-output (MISO) channel, a desired constellation is feasible at the receiver if and only if it can be scaled to lie in an…
Jun Zhu, Ning Wang, Vijay K. Bhargava
—Secure transmission in large-scale MISO systems employing artificial noise (AN) is studied under the per-antenna constant envelope (CE) constraint. Achievable secrecy rate of the per-antenna CE precoding scheme for large-scale MISO is analyzed and compared with that of the matched filter linear precoding . A two-stage…
Sven Jacobsson, Oscar Castañeda, Charles Jeon, Giuseppe Durisi + 1 more
'Christoph Studer'] Abstract—We propose a nonlinear phase-quantized constantenvelope precoding algorithm for the massive multi-user (MU) multiple-input multiple-output (MIMO) downlink. Specifically, we adapt the squared-infinity norm Douglas-Rachford splitting (SQUID) precoder to systems that use oversampling…
Yasaman Omid, Seyyed MohammadMahdi Shahabi, Cunhua Pan, Yansha Deng + 1 more
'Arumugam Nallanathan'] Abstract—In this paper, an intelligent reflecting surface (IRS) aided large-scale MIMO system is investigated in which constant envelope precoding (CEP) is utilized at each base station (BS). It is both cost-effective and energy-efficient to implement CEP in a large-scale antenna array. We aim…
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…
Liang Huang, Xiaofang Deng, Lin Zheng, Huiping Qin + 2 more
'Mengdao Xing'] In this paper, we aim at the problem that MIMO radar’s target detection performance is greatly reduced in the complex multi-signal-dependent interferences environment. We propose a joint design method based on semidefinite relaxation (SDR), fractional programming and randomization technique (JD-SFR) and…
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…
Mohamed Mounir, Mohamed B. El_Mashade, Salah Berra, Gurjot Singh Gaba + 2 more
'Gurjot Singh Gaba' 'Mehedi Masud' 'Xianbin Wang'] Several high-speed wireless systems use Orthogonal Frequency Division Multiplexing (OFDM) due to its advantages. 5G has adopted OFDM and is expected to be considered beyond 5G (B5G). Meanwhile, OFDM has a high Peak-to-Average Power Ratio (PAPR) problem. Hybridization…
Rosa Mach-Batlle, Marco Pisanello, Filippo Pisano, Massimo De Vittorio + 2 more
As implantable optical systems recently enabled new approaches to study the brain with optical radiations, tapered optical fibers emerged as promising implantable waveguides to deliver and collect light from sub-cortical structures of the mouse brain. They rely on a specific feature of multimodal fiber optics: as the…
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…
Katsuaki Kojima, Yulia Oganian, Chang Cai, Anne Findlay + 2 more
The amplitude envelope of speech is crucial for accurate comprehension, and several studies have shown that the phase of neural activity in the theta-delta bands (1 - 10 Hz) tracks the phase of the speech amplitude envelope during listening, a process referred to as envelope tracking. However, the mechanisms underlying…
Yasser A. Zenhom, Ehab K. I. Hamad, Mohammed Alghassab, Mohamed M. Elnabawy + 1 more
'Mohamed M. Elnabawy' 'Yang Yue'] Visible Light Communication (VLC) systems are favoured for numerous applications due to their extensive bandwidth and resilience to electromagnetic interference. This study delineates various constructions of Optical Orthogonal Frequency Division Multiplexing (O-OFDM) approaches…