Results 21 to 30 of about 38,923 (287)
Study of quasi-distributed optical fiber methane sensors based on laser absorption spectrometry [PDF]
, 2019 The coal industry plays an important role in the economic development of China. With the increase of coal mining year by year, coal mine accidents caused by gas explosion also occur frequently, which poses a serious threat to the life safety of ...
Chang, J. +7 more
core +1 more source
Space Division Multiple Access With Distributed User Grouping for Multi-User MIMO-VLC Systems
IEEE Open Journal of the Communications Society, 2020 To support multiple users in an indoor multiple-input multiple-output visible light communication (MIMO-VLC) system adopting spatial multiplexing, orthogonal frequency division multiple access (OFDMA) is usually adopted, where the overall modulation ...
Chen Chen +4 more
doaj +1 more source
Sample indexed spatial orthogonal frequency division multiplexing [PDF]
Chinese Optics Letters, 2014 Optical spatial modulation (OSM) is a multiple-transmitter technique that can provide higher data rates with low system complexity as compared with single-input single-output systems. Orthogonal frequency division multiplexing (OFDM) is widely implemented to achieve better spectral efficiency in wireless channels. Asymmetrically clipped optical OFDM (O-
Pankil Butala Pankil Butala +2 more
openaire +1 more source
A comparison of MIMO-OFDM and MIMO-SCFDE in WLAN environments [PDF]
, 2003 Recent developments in orthogonal frequency division multiplexing (OFDM) and single-carrier frequency-domain equalization (SCFDE) have sparked debate about the superiority of one method over the other.
Armour, SMD +5 more
core +2 more sources
Design of Joint Spatial and Power Domain Multiplexing Scheme for Massive MIMO Systems
International Journal of Antennas and Propagation, 2015 Massive Multiple-Input Multiple-Output (MIMO) is one of the key techniques in 5th generation wireless systems (5G) due to its potential ability to improve spectral efficiency. Most of the existing works on massive MIMO only consider Time Division Duplex (
Zheng Jiang +4 more
doaj +1 more source
Digital Communications and Networks, 2019 Quadrature Spatial Modulation (QSM) is a high spectral efficiency Multiple-Input Multiple Output (MIMO) technique used to improve the spectral efficiency of wireless communication systems. The main concept of QSM is to extend the spatial constellation of
Sherif K. El Dyasti +2 more
doaj +1 more source
2x2 MIMO-OFDM Gigabit fiber-wireless access system based on polarization division multiplexed WDM-PON [PDF]
, 2012 We propose a spectral efficient radio over wavelength division multiplexed passive optical network (WDM-PON) system by combining optical polarization division multiplexing (PDM) and wireless multiple input multiple output (MIMO) spatial multiplexing ...
Agmon +18 more
core +2 more sources
Characteristics of Guided Acoustic Wave Brillouin Scattering in Uncoupled Seven-core Few-mode Fiber
Guangtongxin yanjiu, 2023 The Guided Acoustic Wave Brillouin Scattering (GAWBS) in fibers will be excited at a low optical power level, which can cause large impairments on high-capacity spatial division multiplexing optical fiber communication, digital coherent transmission and ...
ZHANG Ze-lin +8 more
doaj
Graphene-based solitons for spatial division multiplexed switching
Optics Letters, 2017 Spatial division multiplexing utilizes the directionality of lights propagating k-vector to separate it into distinct spatial directions. Here we show that the anisotropy of orthogonal spatial Solitons propagating in a single Graphene monolayer results in phase-based multiplexing.
George, Jonathan K., Sorger, Volker J.
openaire +3 more sources
Adaptive spatial mode of space-time and spacefrequency OFDM system over fading channels [PDF]
, 2006 In this paper we present a 2 transmit 1 receive (1 Tx : 1 Rx) adaptive spatial mode (ASM) of space-time (ST) and space-frequency (SF) orthogonal frequency division multiplexing (OFDM). At low signal to noise ratio (SNR) we employ ST-OFDM and switch to
A. Rahman, Tharek +4 more
core +1 more source