Results 21 to 30 of about 272,036 (281)
Results in Physics, 2023 The 6th generation (6G) of communication technology, defines 0.1–1 THz as the communication band. As a result, ultrafast modulation and multi-dimensional resolution coding technologies in the terahertz band pose a big challenge.
Min Zhang +8 more
doaj +1 more source
Photonics-based reconfigurable multi-band linearly frequency-modulated signal generation
Optics Express, 2018 A photonics-based multi-band linearly frequency-modulated (LFM) waveform generator with reconfigurable center frequency, bandwidth and time duration is proposed and demonstrated. By introducing two coherent optical frequency combs (OFCs) with a frequency shift and different free spectral ranges (FSRs) as multi-frequency optical LOs, a set of LFM ...
Wenjuan Chen +5 more
openaire +2 more sources
Study of selected harmonics elimination control technology of multi-level inverter
Gong-kuang zidonghua, 2014 In order to analyze nonlinear method of selected harmonics elimination PWM technique of multi-level inverter in-depth, several solution models of iterative algorithm were established, solution characteristics of these models were studied, and deficiency ...
YE Manyuan, LI Song, LI Bing
doaj +1 more source
An Accurate Determination of the Optical Periodic Modulation in the X-Ray Binary SAX J1808.4-3658 [PDF]
, 2008 We report on optical imaging of the X-ray binary SAX J1808.4-3658 with the 8-m Gemini South Telescope. The binary, containing an accretion-powered millisecond pulsar, appears to have a large periodic modulation in its quiescent optical emission. In order
Andrew Cumming +23 more
core +3 more sources
IEEE Access, 2019 By using a multi-color laser diode carrier with orthogonal polarization and single-carrier modulation, the long-reach single-mode fiber (SMF) passive optical network and millimeter-wave wireless access network (WAN) with carrying narrow-band and ...
Huai-Yung Wang +4 more
doaj +1 more source
Zero Guard Band Multi-Twin-SSB System in Single Fiber Bidirectional PON Transmission
IEEE Access, 2020 We propose a novel zero guard band (ZGB) multi-twin-SSB bidirectional passive optical network system which combines the multiband carrier-less amplitude phase and twin single sideband (SSB) modulation techniques. The multi-twin-SSB signal is generated at
Xiang Gao +4 more
doaj +1 more source
MATEC Web of Conferences, 2018 A simplified mathematical model for modulation and demodulation of a single channel monopulse (SCM) system is proposed, which is based on a ship-borne pulse radar S-band guided receiver.
Zhang Xudong, Ji Haiyu
doaj +1 more source
Performance evaluation of channel estimation techniques for a proposed '4G' MC-CDMA based system in a time varying channel [PDF]
, 2004 This paper investigates the performance of channel estimation techniques applied to a proposed fourth generation (4G) multi carrier - code division multiple access (MC-CDMA) system.
Armour, SMD +3 more
core +2 more sources
Digital cancellation of multi-band passive inter-modulation based on Wiener-Hammerstein model
Digital Communications and NetworksUtilizing multi-band and multi-carrier techniques enhances throughput and capacity in Long-Term Evolution (LTE)-Advanced and 5G New Radio (NR) mobile networks.
Jinxiang Liu +3 more
doaj +1 more source
Realization of multi-mode universal shadow filter and its application as a frequency-hopping filter
Memories - Materials, Devices, Circuits and Systems, 2023 This work presents a new active block called the differential current conveyor cascaded transconductance amplifier (DCCCTA) and implemented multi-mode biquadratic universal shadow filter.
Divya Singh, Sajal K. Paul
doaj +1 more source