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Low envelope fluctuation OFDM waveform design under subcarrier constraints.

Mingxing Fu1,2, Defu Jiang3,4, Kanghui Jiang3,4

  • 1School of Information Science and Engineering, Hohai University, Nanjing, 210098, China. mingxing_fu@hhu.edu.cn.

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|April 16, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel orthogonal frequency-division multiplexing (OFDM) weight design to reduce signal envelope fluctuations. The method optimizes subcarrier weights for a more constant-envelope waveform, improving efficiency and signal quality.

Keywords:
OFDM waveform designcoefficient of variance of envelope (CVE)envelope fluctuation suppressionsubcarrier-related constraints

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Area of Science:

  • Signal Processing
  • Telecommunications Engineering
  • Optimization Theory

Background:

  • Orthogonal frequency-division multiplexing (OFDM) systems often suffer from high envelope fluctuations, which can degrade performance.
  • Existing methods for envelope reduction in OFDM may lack efficiency or fail to meet subcarrier constraints.

Purpose of the Study:

  • To propose a novel weight design mechanism for OFDM systems to reduce envelope fluctuations.
  • To develop an optimization approach that satisfies subcarrier constraints and maintains a fixed energy budget.
  • To enhance the constant-envelope approximation of OFDM signals.

Main Methods:

  • Introduced a new time-domain metric to guide the OFDM waveform towards a constant-envelope structure.
  • Formulated and solved a non-convex optimization problem for subcarrier weight design, minimizing envelope variance.
  • Employed constraint relaxation and reintroduction to transform the problem into an iterative unconstrained maximization, converging to a local optimum.

Main Results:

  • The proposed method effectively suppresses envelope fluctuations in OFDM signals.
  • The design successfully satisfies pre-assigned subcarrier weights and upper bounds on others.
  • Numerical results show superior performance compared to existing methods in terms of efficiency and constant-envelope approximation.

Conclusions:

  • The developed OFDM weight design mechanism offers an efficient solution for reducing envelope fluctuations.
  • The iterative optimization approach provides a practical method for achieving near-constant-envelope OFDM signals.
  • This work contributes to improved performance and efficiency in OFDM-based communication systems.