An approach to analog mitigation of RFI

Ödling, Per; Borjesson, O.; Magesacher, Thomas; Nordström, Tomas

doi:10.1109/jsac.2002.1007379

Cited by 30 publications

(15 citation statements)

References 11 publications

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“…As N increases, the DFT becomes 'denser' in the sense that there are more points per frequency interval, while the sampling frequency stays constant. Hence, the accuracy of the information rate result given by Equation (13) increases with N, although we do not capture more information with increasing N as long as N > M. Furthermore, a large N is required to justify the invocation of the equivalence claim stated in Equation (14) in numerical simulations.…”

Section: à á ð14þmentioning

confidence: 90%

“…The idea of using the CM signal in wireline communications originates, to our knowledge, from the quest for methods to mitigate radio frequency interference (RFI) [10][11][12][13][14]. Since a twisted-wire pair behaves like an antenna, it picks up radio waves that result in interfering signals at both the DM port and the CM port.…”

Section: Introductionmentioning

confidence: 99%

“…The DM-component interferes additively with the receive signal and is strongly correlated with the CM-component [15]. Hence, the CMcomponent can be used to cancel the DM-interference [10][11][12][13][14]. The extension of this idea to broadband noise is considered in References [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Information rate bounds in common‐mode aided wireline communications

Magesacher

Ödling

Börjesson

et al. 2005

Trans Emerging Tel Tech

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SUMMARYCommunication over the copper twisted-pair channel is performed by transmitting and receiving differential-mode (DM) signals. In this paper, we extend the conventional DM receiver scheme by incorporating the common-mode (CM) signal, which is strongly correlated with the DM signal and can be extracted at the end of every wire pair. The wireline channel, including the CM receive signal, is modelled as a Gaussian vector (multiple-input multiple-output) channel with memory and an arbitrary number of disturbers that introduce interference which can be correlated both temporally and spatially. We investigate the potential of CM-aided reception in terms of information rate for single-user digital subscriber line systems (xDSL) operating on a single pair. Numerical results of information rate calculations using measured channel data are presented. The achievable information rate of the twisted-pair channel when incorporating the CM signal in practically relevant example scenarios can exceed the information rate of the conventional DM channel by a factor of up to two.

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Section: à á ð14þmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Information rate bounds in common‐mode aided wireline communications

Magesacher

Ödling

Börjesson

et al. 2005

Trans Emerging Tel Tech

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“…As discussed earlier, the vectored model in [5] has the resultant channel matrix of size 2N × 2N and thus increases the complexity further for the implementation of equalizers. Therefore, instead of the step involved in (23), we formulate a new N-dimensional CM-DM system model by exploiting (16) for each TP and vectorizing the resultant signals as…”

Section: Vectored Cm-dm Processingmentioning

confidence: 99%

“…This suggests that the CM signals can be used as a reference for estimation of the interferences. For this reason, the CM signals have been utilized to mitigate radio frequency interference (RFI) ingress (see [16] and references therein). Yeap et al [17] and Kamkar-Parsi et al [18] have proposed CM-based adaptive cancelers to mitigate a single wideband noise in downstream transmissions.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a common-mode signal based low-complexity crosstalk cancelation scheme in vectored VDSL

Zafaruddin

Prakriya

Prasad

2012

EURASIP J. Adv. Signal Process.

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In this article, we propose a vectored system by using both common mode (CM) and differential mode (DM) signals in upstream VDSL. We first develop a multi-input multi-output (MIMO) CM channel by using the single-pair CM and MIMO DM channels proposed recently, and study the characteristics of the resultant CM-DM channel matrix. We then propose a low complexity receiver structure in which the CM and DM signals of each twisted-pair (TP) are combined before the application of a MIMO zero forcing (ZF) receiver. We study capacity of the proposed system, and show that the vectored CM-DM processing provides higher data-rates at longer loop-lengths. In the absence of alien crosstalk, application of the ZF receiver on the vectored CM-DM signals yields performance close to the single user bound (SUB). In the presence of alien crosstalk, we show that the vectored CM-DM processing exploits the spatial correlation of CM and DM signals and provides higher data rates than with DM processing only. Simulation results validate the analysis and demonstrate the importance of CM-DM joint processing in vectored VDSL systems.

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OFDM/DMT for Wireline Communications

Henkel

Mayrock

Haunstein

et al. 2011

Signals and Communication Technology

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With wireline, we mean digital subscriber lines as well as optical transmission. Apart from the general aspects of multicarrier modulation, the channel properties are very different. It is thus unavoidable to go into some details of channel transfer characteristics and disturbances. In DSL, the channel characteristics are determined by the propagation constant, the characteristic impedance, and the loop structure, furthermore crosstalk from other loops and ingress (RFI, impulse noise) from outside. In copper loops, the frequency dependent transfer function of the twisted pairs together with possible reflections at splices lead to dispersion which we will also see in optical transmission. There, we distinguish chromatic dispersion and polarization mode dispersion. Optical transmission especially also suffers from non-linear characteristics (Kerr effect), which does not have a counterpart in copper cables. In copper transmission, non-linearities are especially due to the limitations of the D/A converters and power amplifiers, which may lead to clipping of the almost Gaussian distributed time-domain signal of OFDM. This holds for all OFDM transmission. Other nonlinearities may be due to baluns (transformers) used in DSL, but practically, they are of minor relevance.In the following two sections, we will study properties of the channel and specialties of the multicarrier transmission over twisted pairs and optical fibers. Thereafter, we consider a new approach for impulse noise cancellation in DSL and the simulation of optical multicarrier transmission. Discrete MultiTone (DMT) and WirelineChannel Properties W. Henkel, Jacobs University Bremen, GermanyThis chapter describes basic properties of the wireline twister-pair channel and introduces DMT (Discrete MultiTone), the baseband variant of OFDM. Further information can, e.g., be found in a student book project [1], or [2-5]. Properties of the Twisted-Pair ChannelThe twisted pair (TP) cable channel is characterized by a transfer function that is increasingly attenuating with frequency and cross-talk functions that increase with frequency, as well. Furthermore, ingress from radio interferers (RFI), e.g., amateur radio, and impulse noise have a strong impact. In the following, we describe the

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An approach to analog mitigation of RFI

Cited by 30 publications

References 11 publications

Information rate bounds in common‐mode aided wireline communications

Information rate bounds in common‐mode aided wireline communications

Performance analysis of a common-mode signal based low-complexity crosstalk cancelation scheme in vectored VDSL

OFDM/DMT for Wireline Communications

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