Modified SNR Gap Approximation for Resource Allocation in LDPC-Coded Multicarrier Systems

Suls, Adriaan; Verdyck, Jeroen; Moonen, Marc; Moeneclaey, Marc

doi:10.1109/access.2019.2962266

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…where log 2 ( ) is the binary logarithm and Γ is the so-called SNR-gap to capacity -the inclusion of which results in a more accurate model of the relation between the constellation size and the SINR required to achieve a target bit error rate (BER) for practical modulation and coding schemes [27]- [29].…”

Section: E Performance Metricsmentioning

confidence: 99%

Per-Tone Precoding and Per-Tone Equalization for OFDM and DMT Transmission Systems: Duality, Filter Optimization, and Resource Allocation

Verdyck

Lefevre

Tsiaflakis

et al. 2020

IEEE Open J. Signal Process.

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Fellow, IEEEOFDM and DMT transmission systems add a cyclic prefix (CP) or zero pad (ZP) to the transmitted signal. Interference-free transmission requires this CP/ZP to be similarly long as the channel impulse response (CIR), reducing the achievable data rate in highly dispersive channels. A first strategy for dealing with long CIRs without increasing the CP/ZP overhead consists of applying a channel shortening filter to the received signal. A second strategy consists of spectral resource allocation, i.e. bit and power allocation to reduce interference. As little effort has been made towards joint channel shortening and resource allocation, a new algorithm to simultaneously optimize the channel shortening per-tone equalization (PTEQ) filters and the resource allocation is presented.In addition, transmitter-side channel shortening filters are considered, more specifically so-called per-tone precoding (PTPC) filters which apply the channel shortening filter before the IDFT modulation of the ODFM/DMT transmitter. At first glance, the FIR filter optimization for PTPC seems much more involved than the relatively straightforward FIR filter optimization for PTEQ. However, it will be demonstrated that any OFDM/DMT system with PTPC is -after time-reversing the CIR -equivalent to an OFDM/DMT system employing PTEQ. With this result in hand, systems with PTPC can take full advantage of the straightforward FIR filter optimization in systems with PTEQ, as well as of the aforementioned resource allocation algorithm. Simulation results show that the performance obtained for systems with PTPC is nearly indistinguishable from that obtained for systems with PTEQ, making PTPC an interesting alternative channel shortening strategy.

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Section: E Performance Metricsmentioning

confidence: 99%

Per-Tone Precoding and Per-Tone Equalization for OFDM and DMT Transmission Systems: Duality, Filter Optimization, and Resource Allocation

Verdyck

Lefevre

Tsiaflakis

et al. 2020

IEEE Open J. Signal Process.

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“…First, the non-convex term b n k (P k ) in (30) is re-written as 4 Although in DSL the coded bits of a codeword are typically mapped into QAM symbols that are transmitted over different tones (i.e. channel coding across tones), the error rate performance is very close to and thus accurately approximated by the per-tone channel coding case [36].…”

Section: A General Rank-one Multicastingmentioning

confidence: 99%

Physical-Layer Multicasting Design for Downstream G.fast DSL Transmission

Lanneer

Liu

et al. 2019

IEEE Access

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This paper studies the physical-layer multicasting design for downstream G.fast digital subscriber line (DSL) transmission, which corresponds to a multiuser multi-tone (i.e., multi-carrier) scenario. The design goal is to maximize the weighted-sum-group-rate (WSGR) under per-line power constraints. First, as an information-theoretic upper bound, full-rank precoding-based multicasting is considered with joint channel coding across tones. For a single multicast group, this problem corresponds to a non-linear convex semidefinite program (SDP), which is coupled across tones. To reduce the computational complexity, a Lagrange dual decomposition method is developed. This approach is then extended toward multiple multicast groups based on difference-of-convex (DC) programming. Furthermore, a practical multicasting scheme is considered based on rank-one single-stream precoding and independent per-tone channel coding. For this case, instead of relying on computationally complex semidefinite relaxation, a successive convex approximation-based trust-region algorithm is developed. Finally, the simulations of a G.fast cable binder show that the practical multicasting scheme operates close to the information-theoretic multicasting upper bound. INDEX TERMS G.fast, dynamic spectrum management, physical-layer multicasting, rank-one precoding.

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Modified SNR Gap Approximation for Resource Allocation in LDPC-Coded Multicarrier Systems

Cited by 2 publications

References 19 publications

Per-Tone Precoding and Per-Tone Equalization for OFDM and DMT Transmission Systems: Duality, Filter Optimization, and Resource Allocation

Per-Tone Precoding and Per-Tone Equalization for OFDM and DMT Transmission Systems: Duality, Filter Optimization, and Resource Allocation

Physical-Layer Multicasting Design for Downstream G.fast DSL Transmission

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