Combined equalization and alien crosstalk cancellation in ADSL receivers
K. Vanbleu,Geert Ysebaert,Marc Moonen,Piet Vandaele +3 more
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TLDR
This paper addresses the problem of mitigating a dominant alien near-end crosstalker such as HDSL, SDSL or HPNA in DMT-based ADSL and VDSL receivers with an alternative procedure based on the application of so called FREquency-SHift (FRESH) filtering.Abstract:
We address the problem of mitigating a dominant alien near-end crosstalker such as HDSL, SDSL or HPNA in DMT-based ADSL and VDSL receivers. Due to the different symbol rates of crosstalker and signal of interest, linear time-invariant filtering is not appropriate. Recently, Zeng et al. presented a method to tackle this problem [4]. In this paper, we present an alternative procedure, which, unlike the solution of [4], does not require any prior knowledge (such as transmission and crosstalk channel, noise characteristics, etc.) other than the crosstalker symbol rate. Moreover, it is fully adaptive, integrates equalization and crosstalk cancellation and optimizes the signal-to-noise ratio for each tone separately. Both algorithms exploit spectral correlation in the received crosstalking signal, thanks to oversampling and excess bandwidth. The method present here is based on the application of so called FREquency-SHift (FRESH) filtering.read more
Citations
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Journal ArticleDOI
Alien crosstalk elimination in digital subscriber line systems
TL;DR: Elimination of alien crosstalk in coordinated digital subscriber line systems is investigated and evaluation of the whitening receiver performance taking into account the effects of estimation errors is evaluated.
Patent
Systems and methods for canceling crosstalk from digital multi-tone (DMT) signals
TL;DR: In this article, the authors present a system and methods for cancelling crosstalk in a multiple input, multiple output (MIMO) system with a plurality of receivers, which are capable of exchanging information with one another.
Journal ArticleDOI
Split SR-RLS for the joint initialization of the per-tone equalizers and per-tone echo cancelers in DMT-based receivers
TL;DR: The proposed initialization scheme is based on a modification of the square root recursive least squares algorithm to reduce computational complexity and memory requirement compared to full SR-RLS, while keeping the convergence rate acceptably fast.
References
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TL;DR: In this article, the authors present an overview of a generic DSL architecture, including three-port networks for DSLs, as well as several configurations to support ATM transmission convergence in an ADSL environment.
Journal ArticleDOI
Per tone equalization for DMT-based systems
TL;DR: An alternative receiver structure is presented for discrete multitone-based systems that is modified into a structure with a (complex) multitap FEQ per tone by solving a minimum mean-square-error problem, resulting in a larger bit rate while complexity during data transmission is kept at the same level.
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Cyclic Wiener filtering: theory and method
TL;DR: The theory of optimum FRESH filtering, which is a generalization of Wiener filtering called cyclicWiener filtering, is summarized, and the theory is illustrated with specific examples of separating temporally and spectrally overlapping communications signals, including AM, BPSK, and QPSK.
Journal ArticleDOI
Crosstalk identification in xDSL systems
TL;DR: Simulation results show that the proposed methods can identify the crosstalk functions accurately and are consistent with theoretical analysis and to facilitate provisioning, maintenance, and diagnosis of the xDSL systems.
Proceedings Article
RLS-based initialization for per tone equalizers in DMT-receivers
TL;DR: In this paper, an iterative initialization scheme based on so-called RLS with inverse updating is presented for these equalizers and it is demonstrated with an example that in the latter case, initialization complexity becomes sufficiently low and comparable to complexity during data transmission.