Suppression of near- and far-end crosstalk by linear pre- and post-filtering

Honig, Michael L.; Crespo, Pedro M.; Steiglitz, K.

doi:10.1109/49.127783

Cited by 93 publications

(53 citation statements)

References 30 publications

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“…Fortunately, CWDD ensures that the channel matrix is well-conditioned; so the linear ZF canceler leads to negligible noise enhancement and each user achieves a data rate close to the single-user bound (8). This observation is made rigorous in the following theorem.…”

Section: Near-optimal Linear Cancelermentioning

confidence: 85%

“…Unfortunately, these techniques are extremely complex and give poor performance when more than one crosstalker exists. Other techniques use joint linear processing at both the transmit and receive side of the link [8], [9]. This requires colocation of both CO and customer premises (CP) modems, which is typically not possible since different customers are situated at different locations.…”

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confidence: 99%

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A Near-Optimal Linear Crosstalk Canceler for Upstream VDSL

Cendrillon

Ginis²,

Bogaert

et al. 2006

IEEE Trans. Signal Process.

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Abstract-Crosstalk is the major source of performance degradation in VDSL. Several crosstalk cancelers have been proposed to address this. Unfortunately, they suffer from error propagation, high complexity, and long latency. This paper presents a simple, linear zero-forcing (ZF) crosstalk canceler. This design has a low complexity and no latency and does not suffer from error propagation. Furthermore, due to the well-conditioned structure of the VDSL channel matrix, the ZF design causes negligible noise enhancement. A lower bound on the performance of the linear ZF canceler is derived. This allows performance to be predicted without explicit knowledge of the crosstalk channels, which simplifies service provisioning considerably. This bound shows that the linear ZF canceler operates close to the single-user bound. Therefore, the linear ZF canceler is a low-complexity, low-latency design with predictable near-optimal performance. The combination of spectral optimization and crosstalk cancellation is also considered. Spectra optimization in a multiaccess channel generally involves a complex optimization problem. Since the linear ZF canceler decouples transmission on each line, the spectrum on each modem can be optimized independently, leading to a significant reduction in complexity.

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Section: Near-optimal Linear Cancelermentioning

confidence: 85%

mentioning

confidence: 99%

A Near-Optimal Linear Crosstalk Canceler for Upstream VDSL

Cendrillon

Ginis²,

Bogaert

et al. 2006

IEEE Trans. Signal Process.

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“…With this technique and carefully chosen signaling methods, multi-Gb/s serial links have been built. Equalization is also commonly used in telephone subscriber systems to cancel near-end and far-end cross-talk [7][1] [6]. In this thesis, I…”

Section: Discussionmentioning

confidence: 99%

“…In Salz's work [16], the minimum mean square error (MMSE) linear equalizer for the ¡ ¡ channel is completely specified, assuming uncorrelated data and white noise. Later, Honig et al [6] generalized Salz's work by assuming correlated data symbols, pulse amplitude modulation (PAM) signals and colored noise.…”

Section: Application Of Equalizing Filters In Cross-talk Cancellationmentioning

confidence: 99%

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Equalizing filter design for crosstalk cancellation

Ren

Greenstreet

IEEE Computer Society Annual Symposium on VLSI, 2003. Proceedings.

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As interconnect line width and spacing decreases and operating clock rate increases, interconnect has become a bottleneck in developing high-speed integrated circuits, multichip modules, printed circuit boards, and systems. With small line spacing, mutual capacitance and inductance approach the level of self-capacitance and inductance, and can severely degrade signal integrity. The well-known equalizing filter method can significantly improve signal integrity. This thesis explores the effectiveness of equalizing filters in cross-talk cancellation for high-speed, off-chip buses. It demonstrates that linear programming provides effective methods for designing cross-talk canceling equalizing filters that greatly increase the bandwidth of high-speed digital buses.ii

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Performance analysis of adaptive receivers for DS/CDMA communication systems

Ueng

Chen

Yang

2008

Int J Communication

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Both intersymbol interference (ISI) and multiple-access interference (MAI) are the important issues in code division multiple access (CDMA) multiuser communication systems. The step size of the traditional least-mean-square (LMS) adaptive receivers must be substantially adjusted to overcome the effect due to different channel responses or different numbers of active users. The normalized-LMS (NLMS) algorithm call automatically manipulate the adjustment to avoid the problem just discussed. This paper proposes the symbol-based interference rejection filter with NLMS algorithm and derives both finite impulse response (FIR)- and infinite impulse response (IIR)-type algorithms. We also derive the optimal step sizes and minimum mean-square errors (MSEs) for both the FIR and IIR symbol-based receivers. The complexity of our proposed FIR receiver is lower than that of the conventional chip-based receivers. Ill addition, it is shown that the bit error rate performance of our proposed symbol-based receivers is superior to conventional one in the simulations. Simulations also show the correctness Of Our theoretical analysis of minimum MSE. Copyright (C) 2008 John Wiley & Sons, Ltd

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Suppression of near- and far-end crosstalk by linear pre- and post-filtering

Cited by 93 publications

References 30 publications

A Near-Optimal Linear Crosstalk Canceler for Upstream VDSL

A Near-Optimal Linear Crosstalk Canceler for Upstream VDSL

Equalizing filter design for crosstalk cancellation

Performance analysis of adaptive receivers for DS/CDMA communication systems

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