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

The signal-to-noise ratio (SNR) gap approximation provides a closed-form expression for the SNR required for a coded modulation system to achieve a given target error performance for a given constellation size. This approximation has been widely used for resource allocation in the context of trellis...

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Bibliographic Details
Published in:IEEE access Vol. 8; pp. 1577 - 1586
Main Authors: Suls, Adriaan, Verdyck, Jeroen, Moonen, Marc, Moeneclaey, Marc
Format: Journal Article
Language:English
Published: Piscataway IEEE 2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Approximation
Approximation algorithms
channel coding
Codes
Constellations
DSL
Error correcting codes
information theory
LDPC codes
Mathematical analysis
Modulation
OFDM
Parity check codes
Resource allocation
Resource management
Signal to noise ratio
Trellis coding
wireless networks
ISSN:2169-3536, 2169-3536
Online Access:Get full text
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Summary:The signal-to-noise ratio (SNR) gap approximation provides a closed-form expression for the SNR required for a coded modulation system to achieve a given target error performance for a given constellation size. This approximation has been widely used for resource allocation in the context of trellis-coded multicarrier systems (e.g., for digital subscriber line communication). In this contribution, we show that the SNR gap approximation does not accurately model the relation between constellation size and required SNR in low-density parity-check (LDPC) coded multicarrier systems. We solve this problem by using a simple modification of the SNR gap approximation instead, which fully retains the analytical convenience of the former approximation. The performance advantage resulting from the proposed modification is illustrated for single-user digital subscriber line transmission.
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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2962266