Topic
Keying
About: Keying is a research topic. Over the lifetime, 6598 publications have been published within this topic receiving 82943 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: The theoretical gradients of the discrete-input continuous-output memoryless channel's (DCMC) capacity with respect to both a dispersion-matrix set and to the modem constellations are derived, which allows a substantial reduction in the computational complexity required for maximizing the system's capacity.
Abstract: Joint dispersion-matrix and constellation optimization algorithm is proposed, which is invoked for the recent space-time shift keying (STSK) scheme. More specifically, the theoretical gradients of the discrete-input continuous-output memoryless channel's (DCMC) capacity with respect to both a dispersion-matrix set and to the modem constellations are derived, which allows a substantial reduction in the computational complexity required for maximizing the system's capacity. Furthermore, we also conceive a near-capacity irregular-precoded STSK (IR-PSTSK) architecture, which is designed with the aid of extrinsic information transfer (EXIT) charts, while invoking STSK subcodes, which are optimized by using the proposed algorithm.
42 citations
TL;DR: A suboptimal algorithm for modulation classification for classifying the modulation type of general M-ary phase-shifted keying signals is proposed and an asymptotic optimal classification algorithm is derived that is more effective.
Abstract: A suboptimal algorithm for modulation classification was proposed for classifying the modulation type of general M-ary phase-shifted keying (MPSK) signals. Yang and Soliman (see IEEE Trans. Aerosp. Electron. Syst., vol.33, no.1, p.38-45, 1997) approximated the phase probability density function of a received signal to be the Tikhonov function. Instead, we employ the exact phase density function and derive an asymptotic optimal classification algorithm. We show a structure of this proposed classifier for continuous wave (CW), binary phase-shift keying (BPSK), quaternary phase-shift keying (QPSK), and 8PSK. Besides, we give an example to demonstrate the capability of this algorithm and compare its performance to that in Yang and Soliman. It is shown that the performance is more effective.
42 citations
Patent•
AT&T1
TL;DR: In this paper, an over-the-air, three-phase, re-keying technique is used to ensure that no authorized nodes are lost during rekeying and that nodes that are intended to be excluded from re keying are excluded.
Abstract: Security in a mobile ad hoc network is maintained by using various forms of encryption, various encryption schemes, and various multi-phase keying techniques. In one configuration, an over the air, three-phase, re-keying technique is utilized to ensure that no authorized nodes are lost during re-keying and that nodes that are intended to be excluded from re-keying are excluded. In another configuration, an over the air, two-phase keying technique, is utilized to maintain backwards secrecy.
42 citations
TL;DR: A deep learning framework for the design of on-off keying (OOK) based binary signaling transceiver in dimmable visible light communication (VLC) systems using an autoencoder (AE) approach to learn a neural network of the encoder-decoder pair that reconstructs the output identical to an input.
Abstract: This paper develops a deep learning framework for the design of on-off keying (OOK) based binary signaling transceiver in dimmable visible light communication (VLC) systems. The dimming support for the OOK optical signal is achieved by adjusting the number of ones in a binary codeword, which boils down to a combinatorial design problem for the codebook of a constant weight code (CWC) over signal-dependent noise channels. To tackle this challenge, we employ an autoencoder (AE) approach to learn a neural network of the encoder-decoder pair that reconstructs the output identical to an input. In addition, optical channel layers and binarization techniques are introduced to reflect the physical and discrete nature of the OOK-based VLC systems. The VLC transceiver is designed and optimized via the end-to-end training procedure for the AE. Numerical results verify that the proposed transceiver performs better than baseline CWC schemes.
42 citations