Sidelobe Suppression for Multicarrier Signals via Structured Spectral Precoding

Reducing the large sidelobes of multicarrier signals is crucial to prevent adjacent channel interference. Spectral precoding is an effective approach toward this goal, at the expense of throughput loss due to precoder redundancy; thus, it is of interest to explore alternative precoder designs with i...

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Bibliographic Details
Published in:IEEE transactions on communications 2024-06, Vol.72 (6), p.3155-3168
Main Authors: Hussain, Khawar, Lopez-Valcarce, Roberto, Rey, Francesc, Sala-Alvarez, Josep, Villares, Javier
Format: Article
Language:English
Subjects:
Distortion
Interference
Iterative decoding
OFDM
Orthogonal frequency division multiplexing (OFDM)
out-of-band radiation
Precoding
Receivers
Redundancy
Sidelobe reduction
Sidelobes
spectral precoding
spectrum shaping
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Summary:Reducing the large sidelobes of multicarrier signals is crucial to prevent adjacent channel interference. Spectral precoding is an effective approach toward this goal, at the expense of throughput loss due to precoder redundancy; thus, it is of interest to explore alternative precoder designs with improved performance at lower redundancies. We present a novel precoder which minimizes radiated power within a user-selectable frequency region. The structure of the precoding matrix is chosen to allow efficient mitigation of in-band distortion at the receiver by means of iterative and successive interference cancellation, while completely avoiding distortion to protected and pilot subcarriers. By exploiting the low-rank properties of constituent blocks, computational complexity can be significantly reduced with little impact on sidelobe reduction. Simulation results show the benefits of the proposed design, which is particularly effective in redundancy-limited settings targeting high spectral efficiency.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2024.3357429