Results 61 to 70 of about 46,201 (198)

Continuous variable quantum key distribution with two-mode squeezed states

, 2012
Quantum key distribution (QKD) enables two remote parties to grow a shared key which they can use for unconditionally secure communication [1]. The applicable distance of a QKD protocol depends on the loss and the excess noise of the connecting quantum ...
C Silberhorn, C Weedbrook, C Weedbrook, Ch Weedbrook, D Gottesman, F Grosshans, F Grosshans, F Grosshans, J Lodewyck, M Hillery, M Navascues, MD Reid, MM Wolf, NJ Cerf, P Jouguet, P Jouguet, R Dong, R García-Patron, R García-Patrón, R Renner, S Lorenz, S Pirandola, S Pirandola, SL Braunstein, TC Ralph, V Scarani, VC Usenko, VC Usenko, X Su, Y Shen   +29 more
core   +1 more source

Compensation for In-Phase/Quadrature Imbalance in Coherent-Receiver Front End for Optical Quadrature Amplitude Modulation

IEEE Photonics Journal, 2013
We propose a novel method of compensation for imbalance between in-phase (I) and quadrature (Q) channels in the front-end circuit of digital coherent optical receivers.
Md. Saifuddin Faruk, Kazuro Kikuchi
doaj   +1 more source

Assignment on Modulation [PDF]

Considers Sampling, Pulse Amplitude Modulation, Multiple Access, Quantisation, Pulse Coded Modulation, Manchester Line Coding, Amplitude Modulation, Double SideBand Suppressed Carrier Modulation, Quadrature Amplitude Modulation and M-ary Shift ...
Maunder, Rob
core  

Advantages of the coherent state compared with squeeze state in unidimensional continuous variable quantum key distribution

, 2018
In this work, a comparison study between unidimensional (UD) coherent-state and UD squeeze-state protocols is performed in the continuous variable quantum key distribution domain.
Cao, Yanxia, Li, Yongmin, Wang, Pu, Wang, Xuyang   +3 more
core   +1 more source

Warm Rydberg atom-based quadrature amplitude-modulated receiver

Optics Express
Rydberg atoms exhibit both remarkable sensitivity to electromagnetic fields making them promising candidates for revolutionizing field sensors and, unlike conventional antennas, they neither disturb the measured field nor necessitate extensive calibration procedures.
Jan Nowosielski, Marcin Jastrzębski, Pavel Halavach, Karol Łukanowski, Marcin Jarzyna, Mateusz Mazelanik, Wojciech Wasilewski, Michał Parniak   +7 more
openaire   +3 more sources

LDPC-Coded Generalized Frequency Division Multiplexing for Intensity-Modulated Direct-Detection Optical Systems

IEEE Photonics Journal, 2019
In this paper, a low-density parity check (LDPC) coded GFDM with high-level modulation scheme is proposed for more flexible and advanced multicarrier modulation in intensity-modulated/direct-detection (IM/DD) optical systems.
Dong Guo, Wei Zhang, Feng Tian, Jianyang Shi, Kaihui Wang, Miao Kong, Junwen Zhang, Kai Lv, Deng'ao Li, Xiaolong Pan, Xiangjun Xin   +10 more
doaj   +1 more source

A Soft-Output STBC Decoder for Aeronautical Telemetry

Journal of Telecommunications and Information Technology, 2020
Alamouti encoding is a well-known space time block encoding technique used to improve the received signal quality in Rayleigh fading channels. In aeronautical telemetry, this encoding technique is applied to shaped offset quadrature phase shift keying ...
Yves Louet, Rami Othman, Alexandre Skrzypczak   +2 more
doaj   +1 more source

Specific Emitter Identification Using Convolutional Neural Network-Based IQ Imbalance Estimators

IEEE Access, 2019
Specific Emitter Identification is the association of a received signal to a unique emitter, and is made possible by the naturally occurring and unintentional characteristics an emitter imparts onto each transmission, known as its radio frequency ...
Lauren J. Wong, William Christopher Headley, Alan J. Michaels   +2 more
doaj   +1 more source

Flexible digital modulation and coding synthesis for satellite communications [PDF]

An architecture and a hardware prototype of a flexible trellis modem/codec (FTMC) transmitter are presented. The theory of operation is built upon a pragmatic approach to trellis-coded modulation that emphasizes power and spectral efficiency.
Budinger, James, Hoerig, Craig, Tague, John, Vanderaar, Mark   +3 more
core   +1 more source

In-Band Estimation of Optical Signal-to-Noise Ratio From Equalized Signals in Digital Coherent Receivers

IEEE Photonics Journal, 2014
We propose a novel method of in-band estimation of optical signal-to-noise ratio (OSNR) using a digital coherent receiver, where OSNR is determined from second- and fourth-order statistical moments of equalized signals in any modulation format.
Md. Saifuddin Faruk, Yojiro Mori, Kazuro Kikuchi   +2 more
doaj   +1 more source