Results 1 - 10 of 449

Network-Assisted Underwater Acoustic Communications

by T C Yang , Kevin D Heaney
"... Abstract For many underwater acoustic applications, the source and receiver systems carry a single transducer antenna. The lack of spatial diversity makes it difficult to carry out phase coherent communications. Using distributed nodes of an underwater acoustic network, this paper address phase coh ..."
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Abstract For many underwater acoustic applications, the source and receiver systems carry a single transducer antenna. The lack of spatial diversity makes it difficult to carry out phase coherent communications. Using distributed nodes of an underwater acoustic network, this paper address phase

Integrated Doppler Tracking and Effi cient Resampling for Phase-Coherent Acoustic Communication

by n.n.
"... A computationally efficient method for integrating Doppler frequency shift estimation and sample rate interpolation of an acoustic communication signal in a time-varying environment is proposed. The estimation of the Doppler shift is performed using a second-order phase-locked loop in conjunction wi ..."
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A computationally efficient method for integrating Doppler frequency shift estimation and sample rate interpolation of an acoustic communication signal in a time-varying environment is proposed. The estimation of the Doppler shift is performed using a second-order phase-locked loop in conjunction

THE BIT ERROR PROBABILITY OF PSK SYSTEM IN THE PRESENCE OF INTERFERENCE AND NOISE

by Dragana S. Krstić, Mihajlo Č. Stefanović, Dragoljub Martinović
"... In this paper the bit error probability rather than the lower bound for two interferences is evaluated. The signal, interferences and noise are applied at the input to the phase-coherent communication receiver and an expression for the bit error probability is derived for the case when the reference ..."
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In this paper the bit error probability rather than the lower bound for two interferences is evaluated. The signal, interferences and noise are applied at the input to the phase-coherent communication receiver and an expression for the bit error probability is derived for the case when

Matched source-channel communication for field estimation in wireless sensor networks

by Waheed Bajwa - Proc. the Fouth Int. Symposium on Information Processing in Sensor Networks , 2005
"... Abstract — Sensing, processing and communication must be jointly optimized for efficient operation of resource-limited wireless sensor networks. We propose a novel source-channel matching approach for distributed field estimation that naturally integrates these basic operations and facilitates a uni ..."
Abstract - Cited by 40 (11 self) - Add to MetaCart
for phase-coherent communication: the sensor field is uniformly partitioned into multiple cells and the nodes in each cell coherently communicate simple statistics of their measurements to the destination via a dedicated noisy multiple access channel (MAC). Essentially, the optimal field estimate in each

Phase-coherence transitions and communication in the gamma range between delaycoupled neuronal populations. PLoS Comput. Biol. 10:e1003723. doi: 10.1371/journal.pcbi.1003723

by Ro Barardi, Jordi Garcia-ojalvo - IBM , 2000
"... Synchronization between neuronal populations plays an important role in information transmission between brain areas. In particular, collective oscillations emerging from the synchronized activity of thousands of neurons can increase the functional connectivity between neural assemblies by coherentl ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
by coherently coordinating their phases. This synchrony of neuronal activity can take place within a cortical patch or between different cortical regions. While short-range interactions between neurons involve just a few milliseconds, communication through long-range projections between different regions could

The WHOI micro-modem: an acoustic communications and navigation system for multiple platforms

by Lee Freitag, Matthew Grund, Ipa Singh, James Partan, Peter Koski, Keenan Ball, Woods Hole - In Proc. IEEE OCEANS’05 Conf , 2005
"... Abstract — The Micro-Modem is a compact, low-power, underwater acoustic communications and navigation subsystem. It has the capability to perform low-rate frequency-hopping frequency-shift keying (FH-FSK), variable rate phase-coherent keying (PSK), and two different types of long base line navigatio ..."
Abstract - Cited by 143 (5 self) - Add to MetaCart
Abstract — The Micro-Modem is a compact, low-power, underwater acoustic communications and navigation subsystem. It has the capability to perform low-rate frequency-hopping frequency-shift keying (FH-FSK), variable rate phase-coherent keying (PSK), and two different types of long base line

Phase-Encoded Frequency-Hopped Signaling for Underwater Acoustic Communications

by Geoffrey S. Edelson, Bradford W. Gillespie , 1998
"... : Phase-coherent digital communications systems require complicated receivers to overcome the intersymbol ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
: Phase-coherent digital communications systems require complicated receivers to overcome the intersymbol

Noisy quantum phase communication channels

by Berihu Teklu, Jacopo Trapani, Stefano Olivares, Matteo G A Paris , 2015
"... We address quantum phase channels, i.e communication schemes where information is encoded in the phase-shift imposed to a given signal, and analyze their performances in the presence of phase diffusion. We evaluate mutual information for coherent and phase-coherent signals, and for both ideal and re ..."
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We address quantum phase channels, i.e communication schemes where information is encoded in the phase-shift imposed to a given signal, and analyze their performances in the presence of phase diffusion. We evaluate mutual information for coherent and phase-coherent signals, and for both ideal

Phase Estimation for Coherent Optical OFDM

by Xingwen Yi, William Shieh, Yan Tang
"... Abstract—Phase estimation is one of the enabling functionalities in coherent optical orthogonal frequency-division-multiplexing (CO-OFDM) receivers. In this letter, we compare pilot-aided and data-aided phase estimation methods for a CO-OFDM transmission experiment at 8 Gb/s over 1000-km standard si ..."
Abstract - Cited by 7 (2 self) - Add to MetaCart
single-mode fiber without optical dispersion compensation. We also show that as few as five subcarriers are sufficient for pilot-aided phase estimation. Index Terms—Coherent communications, orthogonal frequency-division multiplexing (OFDM), phase estimation. I.

Adaptive Multicarrier Modulation: A Convenient Framework for Time-Frequency Processing in Wireless Communications

by Thomas Keller, Lajos Hanzo - Proc. IEEE , 2000
"... This paper concludes with a wide-ranging throughput comparison of the schemes discussed herein under the unified constraint of a fixed target bit error rate of 10 04 . Keywords---Adaptive modulation, adaptive orthogonal frequency -division multiplexing (AOFDM), applications of OFDM, blind modem m ..."
Abstract - Cited by 122 (10 self) - Add to MetaCart
fluctuation in OFDM, phase noise in OFDM, preequalization, synchronization in OFDM, throughput of adaptive OFDM, wireless asynchronous transfer mode (WATM) using OFDM, wireless local-area networks (WLAN's) using OFDM. I. INTRODUCTION High-data-rate communications are limited not only by noise but
Results 1 - 10 of 449