Results 51 to 60 of about 7,335,937 (187)
IEEE Photonics Journal, 2019 A novel optical frequency-hopping scheme based on a flexible structure for secure optical communications is proposed and demonstrated. In the proposed scheme, critical users’ data are divided into a lot of segments, and these segments are ...
De Chao Ban +5 more
doaj +1 more source
IEEE Access, 2020 For the sake of meeting the variable requirements of different quasi-synchronous (QS) frequency-hopping multiple-access (FHMA) communication systems, low-hit-zone (LHZ) frequency-hopping sequence (FHS) sets with flexible parameters and optimal Hamming ...
Limengnan Zhou, Xing Liu
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Joint signal parameter estimation of frequency-hopping communications
IET Communications, 2012 In the problem of the parameter estimation of frequency-hopping (FH) signals, most of existing works can only provide the unauthorised detection of the FH signals or estimate the part of parameters of FH signals, therefore cannot provide sufficient information to demodulate signals for message deciphering applications in a non-cooperative ...
openaire +1 more source
, 2002 Ultra-wideband (UWB) systems having a bandwidth on the order of gigahertz have recently received wide attention both in the U.S. and in Europe. The family of UWB systems may communicate either by generating ultra-wideband signals or with the aid of ...
Yang, L-L, Hanzo, L.
core +1 more source
IET Microwaves, Antennas & PropagationBased on the mechanical regulation mechanism, a super‐low‐frequency (SLF) reconfigurable magnetoelectric (ME) antenna is proposed for underwater frequency‐hopping communication.
Shi‐Yu Wang +4 more
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Slow Frequency Hopping Assisted MC DS-CDMA using Large Area Synchronised Spreading Sequences
, 2005 The family of Multi-Carrier Direct-Sequence CDMA (MC DS- CDMA) systems exhibits numerous attractive properties, which render them attractive candidates for next-generation wireless communications.
Wei, H, Yang, L-L., Hanzo, L.
core +1 more source
New Families of Frequency-Hopping Sequence Sets with a Low-Hit-Zone
EntropyAs a means of spread spectrum communication, frequency-hopping technology has good performance in anti-jamming, multiple-access, security, covert communications, and so on.
Limengnan Zhou, Hanzhou Wu
doaj +1 more source
Nature Communications, 2020 Designing efficient power and communication electronics remains a challenge. Here, the authors reveal info characteristics of power electronics and propose a modulation strategy based on frequency hopping-differential phase shift keying to enable power ...
Xiangning He +3 more
doaj +1 more source
Identification of Frequency Hopping Communications
, 2000 A method to detect and characterize a frequency hopping (FH) signal is proposed. The context is Spectrum Surveillance. Hence, no a priori information is available: the parameters of the modulation must be automatically determined. Spread spectrum (SS) modulations are well-known for their low probability of interception (LPI).
Berder, Olivier +2 more
openaire +2 more sources
A Novel Optical Frequency-Hopping System Based on DFB Laser Integrated With an EA Modulator
IEEE Photonics Journal, 2019 A novel optical frequency-hopping system based on distributed feedback laser integrated with an electroabsorption modulator is proposed and demonstrated.
Dechao Ban +9 more
doaj +1 more source