Topic
Keying
About: Keying is a research topic. Over the lifetime, 6598 publications have been published within this topic receiving 82943 citations.
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01 Dec 2013
TL;DR: This paper introduces a simple protocol that will allow the transmitter to inform the receiver how the MIMO data streams should be processed to realize the FEC and reconstruct the transmitted message.
Abstract: Camera communications is the use of an image sensor to receive LED modulated data. The undersampling properties of UFSOOK allows the encoding of bits at frequency shift ON-OFF keying frequencies that avoid flicker while at the same time being successfully decoded by a low frame rate camera. PWM dimming is supported via data modulation of the PWM frequency, but requires that FEC be added in the form of multi-phase sampling due to asynchronous clocking. Multiple LEDs can be modulated to send parallel data streams to the receiver enabling MIMO. This paper introduces a simple protocol that will allow the transmitter to inform the receiver how the MIMO data streams should be processed to realize the FEC and reconstruct the transmitted message.
55 citations
TL;DR: A two-stage hybrid method combining short-time Fourier transform (STFT) and convolutional neural network (CNN) for automatically recognizing six different modulation types achieved excellent results in the noised-modulation signals.
55 citations
TL;DR: The asynchronous amplitude histogram monitoring method is proved to be a precise and versatile monitoring tool for high-capacity optical networks.
Abstract: As optical networks continue to grow towards high capacity and high flexibility, new transmission technologies are being introduced. In order to maintain the quality of signal and control over network in the transparent domains, optical performance monitoring (OPM) systems are becoming a necessity. Phase modulation formats emerge as the solution of choice in transparent domains because of their sensitivity, spectral efficiency, and resilience to optical impairments. In this paper, we demonstrate a flexible OPM method for phase-modulated signals using asynchronous amplitude histogram analysis. We show numerically and experimentally the monitoring of optical signal-to-noise ratio (OSNR), chromatic dispersion (CD), and polarization-mode dispersion (PMD) for differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) signals. The OSNR can be measured within range of 20-35 dB and accumulated chromatic dispersion between 600 and 600 ps/nm. The asynchronous amplitude histogram monitoring method is proved to be a precise and versatile monitoring tool for high-capacity optical networks.
54 citations
Patent•
21 Feb 2002TL;DR: In this article, an enhanced IMS AKA that allows a UE to register with IMS for all multimedia applications to which it is subscribed is presented, and the message content of CM2 is augmented to include a list of all services to which the UE is subscribed along with either information that allows establishing SAs for each service or information that could be used as keying material or other input for other security mechanisms specific to each service.
Abstract: An enhanced IMS AKA ( 21 ) that allows a UE to register with IMS for all multimedia applications to which it is subscribed. Some of the message content of some of the IMS AKA messages ( 22 ) per TS 3GPP 33.203 v 1.0.0 is augmented, and in particular, the message content of CM2 is augmented to include a list of all services to which the UE is subscribed along with either information that allows establishing SAs for each service or information that could be used as keying material or other input for other security mechanisms specific to each service.
54 citations
TL;DR: The chaotic shift keying, which is the most robust chaotic secure communication scheme, is unmasked by using two simple single-layer neural networks (NNs) with known text attack strategy and low-pass filtering and thresholding.
54 citations