Mask-Compliant Orthogonal Precoding for Spectrally Efficient OFDM

Orthogonal precoding constitutes a powerful technique to reduce spectrum sidelobes of multicarrier signals. This reduction is bought at the cost of introducing precoder redundancy, which results in some throughput loss and additional precoding/decoding complexity. When the goal is to meet some spect...

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Bibliographic Details
Published in:IEEE transactions on communications 2021-03, Vol.69 (3), p.1990-2001
Main Authors: Kumar, Ravinder, Hussain, Khawar, Lopez-Valcarce, Roberto
Format: Article
Language:English
Subjects:
Constraint modelling
Degradation
Distortion
Lagrange multiplier
Notches
OFDM
Orthogonal Frequency Division Multiplexing
Orthogonal frequency division multiplexing (OFDM)
Precoding
Receivers
Redundancy
Sidelobe reduction
Sidelobes
Spectra
Spectral emission
spectral precoding
spectrum shaping
Throughput
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Summary:Orthogonal precoding constitutes a powerful technique to reduce spectrum sidelobes of multicarrier signals. This reduction is bought at the cost of introducing precoder redundancy, which results in some throughput loss and additional precoding/decoding complexity. When the goal is to meet some spectral emission mask constraints, it is desirable to avoid unnecessary sidelobe suppression in order to keep precoder redundancy at a minimum. In this context, we introduce a general framework under which we develop a novel Lagrange multiplier-based mask-compliant orthogonal precoder design targeting minimal redundancy. We also adapt to this framework two previously proposed designs based on spectral notches and minimum out-of-band emission, respectively, to explicitly incorporate mask constraints. Simulation results are provided to show the effectiveness of the proposed designs under different practical masks for multicarrier wireless systems.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2020.3041351