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article · IEEE Communications Letters

Assessing IQE for Full Duplex Relaying Schemes With Unidentified Modulation Forms

Abstract

This study tackles the issue of in-phase and quadrature-phase error (IQE) in full-duplex amplify-and-forward relaying (FDR) systems. This problem is analyzed within the framework of orthogonal frequency division multiplexing (OFDM) transmissions. We propose a creative approach to calculate the IQE occurring at all terminals, assuming that the modulation type is unknown. Moreover, the channel impulse responses among different nodes are incorporated into the IQE parameters, avoiding the necessity for decoupling, as done in prior research. The proposed algorithm draws on the duplication characteristics associated with FDR transmissions to obtain maximum-likelihood estimates of the pertinent parameters. Comprehensive simulations validate the efficacy of the proposed algorithm, demonstrating significant improvements in estimation performance relative to the leading algorithms.

Research topics

  • Full-Duplex Wireless Communications
  • Electromagnetic Compatibility and Measurements

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DOI: 10.1109/lcomm.2025.3572217

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