A General Framework for Mixed-Domain Echo Cancellation in Discrete Multitone Systems

Ehtiati, N.; Champagne, Benoı̂t

doi:10.1109/tcomm.2012.120512.110258

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Echo cancellation (EC) [91] and NEXT cancellation [92] are critical techniques for guaranteeing the performance of multi-pair FD DSL systems. Akin to FEXT cancellation, NEXT cancellation is only possible at the DP side, or for either a subgroup of coordinated CPEs or a single CPE connected to multiple twisted pairs (the upstream dual of Fig.…”

Section: ) Duplexingmentioning

confidence: 99%

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Zhang

et al. 2020

IEEE Access

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With the escalating demand for high speed, high reliability, low latency, low cost and ubiquitous connectivity, the telecommunications industry is entering a new era where the ultimate optimality of the current wireline-wireless access network has to be achieved. Regarding the current wireline network paradigm, dominated by the copper-based digital subscriber lines (DSL) technology, multi-Gigabit data rate is the ambitious design objective at the customer end for the forthcoming ITU-T G.mgfast standard. In order to prepare for the new challenges in the era of total network convergence, both the wireline and the wireless community must be able to think beyond their respective conventions and learn from each other if necessary. Overall, the current DSL-based wireline network architecture is prone to the mutual interference resulting in far-end crosstalk (FEXT). The newly expanded 424/848 MHz spectrum of the ambitious G.mgfast project introduces far higher FEXT than that over the current 212/30 MHz G.fast/VDSL2 band. Additionally, the coexistence of multiple standards will also cause 'alien' FEXT. In these cases, using the plain zero forcing precoding (ZFP) will no longer attain a sufficiently high performance. However, as shown in the field of wireless communications, using lattice reduction as a signal space remapping technique significantly improves the performance of traditional multiuser detectors (MUD) and of the respective multiuser precoders (MUP). These promising techniques have largely remained unexploited in commercial wireless communications, due to their complexity in the face of the rapidly fluctuating wireless channels. In this survey, we present an overview of the state-of-the-art in wireline access network and an outlook for recent technological advances in the holistic 'wireline + wireless' access network in the context of network convergence, focusing on the dominant challenge of FEXT mitigation in future DSL networks. Against this background, we investigate both the family of linear precoding and of the Tomlinson-Harashima precoding (THP) schemes conceived for classic DSL. Furthermore, we present a tutorial on the family of lattice reduction aided MUPs, as well as quantifying their expected performances in realistic DSL scenarios. As a by-product, we also demonstrate the duality between MUP and MUD, in the hope that the fifty years' history of MUD could be used to accelerate the development of efficient near-optimal MUPs for future DSL. Under the recommended operating conditions of the 212 MHz profile of G.fast, our benchmark comparisons indicate that the lattice reduction aided techniques are very powerful compared to conventional schemes. In particular, their good performances do not rely on optimized spectrum balancing, and they are also shown to be relatively robust against channel state information (CSI) estimation error, under the assumption of perfectly time-invariant DSL channels.

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Section: ) Duplexingmentioning

confidence: 99%

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Zhang

et al. 2020

IEEE Access

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“…Result shows that the algorithm provides effective nonlinear echo cancellation in the presence of continuous double-talk, varying degree of nonlinear distortion, and changes in the echo path. In 2013, a general framework for designing echo cancellers for full-duplex communication systems with discrete multi-tone (DMT) modulation system in an arbitrary mixed domain were introduced by Neda Ehtiati and Beno Champagne [15]. They derived a new mixed-domain echo cancellation structure, achieved by a generic decomposition of the toeplitz data matrix at the transmitter in terms of arbitrary unitary matrices.…”

Section: Review On Acoustic Echo Cancellation Systemmentioning

confidence: 99%

Review Paper on Linear and Nonlinear Acoustic Echo Cancellation

Gupta¹,

Gupta²,

Chandra³

2015

Advances in Intelligent Systems and Computing

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Abstract. In this paper a review on acoustic echo cancellation (AEC) systems based on linear AEC and nonlinear AEC are presented. The paper covers advancements in the previous research works related to the acoustic echo cancellation process. Here review is done based on adaptive algorithms used. Since in linear AEC systems, the non-linearity caused by loudspeakers, amplifier and low-quality enclosures are not taken into considerations. The implementation of linear AEC is based on the assumption of linearity. The performance of echo cancellation algorithms are degraded due to non-linearities in the acoustic path. Therefore non-linear AEC systems are evaluated and reviewed along with linear AEC.

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“…Typically this will also require some frequency domain equalization to account for remaining per sub-channel phase and gain mismatches. Examples can be found in [101,102,103,104,105].…”

Section: Receive Side Time Equalizationmentioning

confidence: 99%

High Data Rate DMT SERDES Design

Zhe¹

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The research presented in this thesis involves implementing a high data rate wireline communication system using Discrete Multitone (DMT) transmission. A theoretical analysis of the model of channels typically used for serializer/deserializer SERDES chip-to-chip communication is done, showing the benefits of DMT through improved spectral efficiency, and simplified transceiver design due to the pseudo-narrowband characteristics of DMT. Simulations results demonstrate this benefit by being able to achieve higher data rates than conventionally used non-return-to-zero (NRZ) and pulse-amplitude modulation (PAM) typically used, even with typical channel correction circuitry such as continuous-time linear equalizers (fs) and decision-feedback equalizers (DFEs). Furthermore, a combined bit-loading/power allocation and transmit side equalization algorithm is presented that can improve the data rate of the system and decrease its bit error rate. Measurement results are demonstrated using a digital-to-analog-converter (DAC) and analog-to-digital converter (ADC) test bed in realistic conditions for chip-to-chip communications with a data rate over 250 GB/s with a sufficient overhead for forward-error-correction (FEC) coding needed to reduce the bit-error rate (BER).

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A General Framework for Mixed-Domain Echo Cancellation in Discrete Multitone Systems

Cited by 8 publications

References 19 publications

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Review Paper on Linear and Nonlinear Acoustic Echo Cancellation

High Data Rate DMT SERDES Design

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