Approximate Perturbation Aided Lattice Encoding (APPLE) for G.fast and Beyond

Zhang, Yangyishi; Zhang, Rong; Rawi, Anas F. Al; Hanzo, Lajos

doi:10.1109/access.2018.2871026

Cited by 5 publications

(13 citation statements)

References 23 publications

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“…This is also known in wireline communications as static spectrum balancing (SSB, as opposed to DSB) since there is no optimization involved. In fact, it is shown in [42] that the two TxPSD characterization methods have a simple geometric relationship in the signal space. Meanwhile, scalar power assignment can also significantly reduce the complexity of spectrum balancing, in which case practical seamless rate adaptation (SRA) techniques [118] may be efficiently invoked.…”

Section: B Linear Precoding 1) Plain Zero Forcingmentioning

confidence: 99%

“…With respect to the MUP design for downstream DSL, it is known from (9)(19) and Fig. 4 that the SNR penalty is the dominant problem over the wide bandwidth of G.mgfast (also in [42], [161]) compared to the losses discussed in Sec. III-C3.…”

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

“…Under the principle of DPC, the choice of the perturbation vector l l l should be limited to the set of scaled integers φZ 2K so that the modulo receivers φ [•] can reconstruct the transmitted signal without knowing the exact value of l l l. The same principle applies to the THP. For analytical simplicity, uniformly distributed continuous constellations are widely considered in non-linear MUP analysis [42], [148], [163]. Let U be a continuous square set formulated as:…”

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

“…This MUP design is known as the vector perturbation (VP) [162] precoding. Based on the concept of the decision region of MUDs, the authors of [42] proposed the dual concept of the vectoring mapping region (VMR). Because L(G G G) and L(H H H ) constitute a pair of dual lattices [155], the VMR and the MUD decision regions are closely related.…”

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

“…In [160] and [42], the concept of approximate lattice decoding and approximate lattice encoding were proposed independently for MUD and MUP. We shall adopt this notion and observe the influence of LR on the plain ZFP and the ZF-THP approaches, instead of using the potentially ambiguous terminology of lattice reduction aide broadcast precoding [164], the latter of which essentially constitutes extensions to the vector perturbation scheme we will cover later.…”

Section: B Approximate Lattice Precodingmentioning

confidence: 99%

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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: B Linear Precoding 1) Plain Zero Forcingmentioning

confidence: 99%

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

Section: ) the Essence Of Vectoring And The Dualitymentioning

confidence: 99%

Section: B Approximate Lattice Precodingmentioning

confidence: 99%

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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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Lattice Reduction Aided Precoding Design in Downstream G.fast DSL Networks

et al. 2020

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Innovations in Access', FWO nr. G.0B1818N 'Real-time adaptive cross-layer dynamic spectrum management for 5th generation broadband copper access networks', Fonds de la Recherche Scientifique-FNRS and the Fonds' Wetenschappelijk Onderzoek-Vlaanderen under EOS Project no 30452698 'MUlti-SErvice WIreless NETwork'. This research work is presented in the Ph.D. dissertation of the first author [1]. The scientific responsibility is assumed by its authors.

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