Results 61 to 70 of about 7,335,937 (186)

Overlapping M-ary Frequency Shift Keying Spread-Spectrum Multiple-Access Systems using Random Signature Sequences

, 1999
In this paper, a multiple-access spread-spectrum communication system using binary frequency shift keying (BFSK) or M-ary frequency shift keying (MFSK) and noncoherent demodulation is considered.
Yang, L-L., Hanzo, L.
core   +1 more source

Parameter Estimation Algorithm for Suppression Jamming Signals Based on an Improved YOLOv8

Information
In military confrontations, intentional suppression jamming can significantly degrade the reliability of friendly communication systems. By integrating conventional frequency hopping with spectrum sensing, cognitive frequency hopping technology can ...
Hangyu Yang, Zhaoran He, Lu Xu, Rui Xue
doaj   +1 more source

A Fast and High-Precision Satellite-Ground Synchronization Technology in Satellite Beam Hopping Communication

Space: Science & Technology
A key requirement for future multibeam broadband satellite communication systems is the ability to flexibly adjust beam capacity according to changes in business distribution, in order to meet time-varying business requirements.
Tengfei Hui, Shenghua Zhai, Zehui Zhang, Chong Liu, Xianfeng Gong, Zhitong Ni, Kai Yang   +6 more
doaj   +1 more source

Design And Development Of A Secure Wireless System Using Frequency Hopping Spread Spectrum [TK5103.2. A148 2007 f rb]. [PDF]

, 2007
Dalam penyelidikan ini, satu sistem tanpa wayar automasi untuk menghantar data yang bersertakan kod PN secara automatik kepada pihak berkuasa berkenaan telah dibangunkan.
Yahya, Abid
core   +1 more source

History of the Hopping family in England and genealogy of the John Hopping family in America /

, 1952
Includes indexes.Supplement by L. M.
Hopping, Louis M., 1900-, Hopping, Edward Stuart, b. 1871.   +1 more
core  

Performance of Long Range-Frequency Hopping Spread Spectrum (LR-FHSS) For LoRaWAN Satellite Communication

Emerging Information Science and Technology
Some factors that need to be developed in the LoRaWAN satellite communication system are using LR-FHSS (Long Range-Frequency Hoppong Spread Spectrum) to increase resistance to frequency interference and jamming, with the technique of using a small ...
Puput Adi, Kevin Stekelorom
doaj   +1 more source

Performance Comparison of FH/MC DS-CDMA with Single- and Multi-Carrier DS-CDMA

, 2000
In this contribution we review the slow frequency hopping multicarrier direct-sequence code-division multiple-access (SFH/MC DS-CDMA). Then, the system's performance is ecalated and compared to that of the conventional single-carrier (SC) DS-CDMA and MC ...
Yang, L-L., Hanzo, L.
core   +1 more source

Performance Evaluation of Distributed-Antenna Communications Systems Using Beam-Hopping

, 2005
Digital beamforming (DBF) techniques are capable of improving the performance of communications systems significantly. However, if the transmitted signals are conflicted with strong interference, especially, in the direction of the transmitted beams ...
Yang, L.-L., Zhu, J., Hu, H.
core   +1 more source

Low-Complexity Reduced-Rank Adaptive Detection in Hybrid Direct-Sequence Time-Hopping Ultrawide Bandwidth Systems

, 2009
— In this contribution reduced-rank adaptive minimum mean-square error multiuser detector (MMSE-MUD) is proposed and investi-gated for the hybrid direct-sequence time-hopping ultrawide bandwidth (DS-TH UWB) systems.
Ahmed, Qasim, Lie-liang Yang, Yang, Lie-Liang, Qasim Zeeshan Ahmed   +3 more
core   +1 more source

Multiuser MIMO-OFDM Systems using Subcarrier Hopping

, 2006
Recently space division multiple access (SDMA) assisted multiple-input–multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems invoking multiuser detection (MUD) techniques have attracted substantial research interest, which is ...
Jiang, M, Hanzo, L
core   +1 more source