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Crosstalk Channel Estimation via Standardized Two-Port Measurements
2009
EURASIP Journal on Advances in Signal Processing
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Acquiring such information normally requires dedicated apparatus since crosstalk-channel measurement is not included in the current digital subscriber line (DSL) standards. ...
We address this problem by presenting a standard-compliant estimator for the square-magnitude of the frequency-dependent crosstalk channels that uses only functionality existing in today's standards. ...
Flow chart of the FEXT and NEXT channel estimator, based on the two-port loop diagnostic (LD) protocol. ...
doi:10.1155/2008/916865
fatcat:3gvbentaxjajhjrl7i25wbguue
Impact of Crosstalk Estimation on the Dynamic Spectrum Management Performance
2008
IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference
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For a reference comparison, the crosstalk channels are measured with a network analyzer. ...
Two different crosstalk estimators are considered: a conventional model-based estimator and a novel estimation procedure. ...
Since the total FEXT channel for Estimator B includes the transmit and receive filters of the DSL modems performing the two-port measurement [14] , some deviation is expected Fig. 7 . ...
doi:10.1109/glocom.2008.ecp.544
dblp:conf/globecom/LindqvistLDPK08
fatcat:tmctdorq25djja64crzgeturay
Dsm Performance On Practical Dsl Systems Based On Estimated Crosstalk Channel Information
2009
Zenodo
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In this work, the crosstalk channels are both measured with a network analyzer and estimated via Loop Diagnostic. ...
By utilizing the two-port measurement procedure referred to as Loop Diagnostic [20] , the measurements can be executed and coordinated from a network management system. ...
doi:10.5281/zenodo.41647
fatcat:u6nfkd7eq5gwdnfc6vs6ax56ki
Multi-Pair Cable Measurements for 5G Indoor Service Provisioning
2021
Journal of networking and network applications
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The paper focuses on the de-tailed methodology for multi-pair copper channel measurement including measurement equipment specifications, their respective settings, measurement parameters i.e. characteristics ...
impedance, insertion loss (IL), far-end-crosstalk (FEXT) and near-end-crosstalk (NEXT). ...
Two-port calibration requires measurements on four standards short-openload-through or SOLT. The standards are defined in a calkit definition file, which is stored in the Agilent PNA. ...
doi:10.33969/j-nana.2021.010104
fatcat:gqu3aixkwzhvjhhr7brlmodneu
Wireline Communications In A Wireless World
2017
Zenodo
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To cut this Gordian knot, a new precoding scheme combining beamforming and crosstalk mitigation is presented, improving the bit-loading capability at high frequencies via constructive crosstalk from adjacent ...
However, its effectiveness gets saturated after around 200MHz due to severe data channel attenuation and strong interference level. ...
An example of CRS pattern for two different antenna ports of one RH, which has two pairs, each transport the signal of one antenna port, are shown in Fig. 5 .12a and 5.12b, respectively. ...
doi:10.5281/zenodo.1164194
fatcat:36hn6vdwtvcxho5fllp7qkauke
The Impact of Modal Interactions on Receiver Complexity in OAM Fibers
2017
Journal of Lightwave Technology
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We use time of flight and channel impulse response measurements to characterize our OAM-MDM link and quantify modal impairments. ...
We examine two OAM fibers with different index profiles and differential mode group delays (DMGD) between supported vector modes. ...
The demux output ports are captured by a DSO. We launched pulses on one channel at a time and recorded each demux output port. ...
doi:10.1109/jlt.2017.2751248
fatcat:qy2xhng5mbg2hpwgwxueys7xla
Temporal Stability of a Transparent Mode Group Diversity Multiplexing Link
2006
IEEE Photonics Technology Letters
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Crosstalk clearly depends on the channel estimation period. ...
Fig. 4 shows the average and maximum calculated crosstalk at the two MGDM channels for different during the 12.7-h measurement of the coefficients. ...
doi:10.1109/lpt.2006.886978
fatcat:en46z7hci5cc7dszijd7vpjxiy
114Tb/s DP-QPSK WDM polarization-diverse optical phase conjugation
2014
Optics Express
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Figures 3(a) and 3(b) display snapshots of the crosstalk at two different input signal launch powers of + 6dBm per channel and + 3dBm per channel respectively (measured after the WSS) as neighboring channels ...
The crosstalk level could only be measured by switching off an input signal (which in turn slightly changed the level of crosstalk that existed prior to the channel being removed). ...
doi:10.1364/oe.22.011840
pmid:24921305
fatcat:bpnnef7rjvfxlfsgbhbeso734y
1.5 Gbit/s Multi-Channel Visible Light Communications Using CMOS-Controlled GaN-Based LEDs
2013
Journal of Lightwave Technology
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When driven by a custom-made CMOS driving board with 16 independent parallel data input ports, this µLED array device is computer controllable via a standard USB interface and is capable of delivering ...
Electrical and optical crosstalk of the system has also been investigated in detail and the further optimization of CMOS design to minimize the crosstalk is proposed. ...
Fig. 5 . 5 Bit-error ratios measured from the CMOS/µLED pixel at 375 Mbit/s, with one channel, two channels, three channels and four channels in operation, as a function of received optical power at the ...
doi:10.1109/jlt.2013.2246138
fatcat:s4v32m6vizbbvhsdfr4owt47sa
40 Gb/s optical subassembly module for a multi-channel bidirectional optical link
2014
Optics Express
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The measured inter-channel crosstalk of the bidirectional 40 Gb/s optical link is about −22.6 dB, while the fullduplex operation mode demonstrates negligible crosstalk between the upand down-link. ...
A 40 Gb/s bidirectional optical link using four-channel optical subassembly (OSA) modules and two different wavelengths for the up-and down-link is demonstrated. ...
These modules were connected using an OM3 standard MMF fibers array with four channels and a length of 2 m to measure the end-to-end optical link. ...
doi:10.1364/oe.22.001768
pmid:24515184
fatcat:sk2xz3u6jzabdiutsf367cxeqy
RoF Data Transmission Using Four Linearly Polarized Vector Modes of a Polarization Maintaining Elliptical Ring Core Fiber
2018
Journal of Lightwave Technology
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Furthermore, we examine the impact of fiber bending on crosstalk among channels. ...
For the first time, we report transmission of four RF streams over four channels in a few mode fiber. ...
To calculate the crosstalk on channel i, i = 1,..,4, we set the HWP and SLM in the demultiplexer to receive channel i at the output port, i.e., creating output port i. ...
doi:10.1109/jlt.2018.2851613
fatcat:ohbsln7wbzaihhidtklc4pfd6e
Impact of Crosstalk Channel Estimation on the DSM Performance for DSL Networks
2010
EURASIP Journal on Advances in Signal Processing
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Since these experiments assume network scenarios consisting of real twisted-pair cables, both crosstalk channel estimates and measurements (for a reference comparison) are considered. ...
A recently proposed crosstalk channel estimator is considered and a statistical sensitivity analysis is conducted to investigate the effects of the crosstalk estimation error on the bitloading and on the ...
The Crosstalk Estimator presented in [24] relies only on standardized DSL signals and protocols, for example, the two-port measurement procedure referred to as Loop Diagnostic [26] , which are supported ...
doi:10.1155/2010/935076
fatcat:b5ifvvvdrfer5kzm7tu5tqxxyq
Signal Processing for Gigabit-Rate Wireline Communications
[article]
2017
arXiv
pre-print
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Even more powerful signal processing techniques are required to enable a gigabit per second data rate in the upcoming G.fast standard. ...
At such a high bandwidth, crosstalk between different lines in a binder will reach unprecedented levels, which are beyond the capabilities of most efficient techniques for interference mitigation. ...
Extensive measurement campaigns are in progress for the standardization of the G.fast crosstalk channel model [24] , [25] . ...
arXiv:1706.03538v1
fatcat:njx2n6lsvzfmdjl2yrspjguyza
Design and Calibration of an Optically Segmented Single Volume Scatter Camera for Neutron Imaging
[article]
2021
arXiv
pre-print
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2021 pre-print arXiv:2102.02951v1 fatcat:gvqu2dqrqbeuxewjolmzdaaqte
The scintillator array is optically coupled to two silicon photomultiplier ArrayJ-60035 64P-PCB arrays, each comprised of 64 individual 6 × 6 mm J-Series sensors arranged in an 8 × 8 array. ...
The coincident time resolution reported between pairs of bars measured up to 400 ps from muon acquisitions. ...
A second input port is used for digitizing each channel in an event. The third input port reads out trigger information, that indicates which channels we triggered during the event. ...
arXiv:2102.02951v2
fatcat:awffl5xxivavzlzv5qhy4vy26u
Liquid crystal-based self-aligning 2×2 wavelength routing module
2001
Optical Engineering: The Journal of SPIE
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Key features include low polarization sensitivity and a selfaligning module via a compact retroreflective structure. ...
An average polarization dependent loss of 0.4 dB is also measured. A time-multiplexed FLC device addressing technique is introduced for FOS to achieve long duration operation. ...
This PDL comes from the unbalanced optical loss of the two polarization independent switching channels and three-port optical circulators used in our FOS structure. ...
doi:10.1117/1.1387988
fatcat:3jpytzrbhbgnlchxaehus4petq
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