Reducing Effect of the Nonlinear Distortion in M-QAM OFDM System by Pilot-Based Automatic Phase Shift

International Journal of Electrical and Electronics Engineering

© 2024 by SSRG - IJEEE Journal

Volume 11 Issue 11

Year of Publication : 2024

Authors : Vinh Nguyen Van, Hai Doan Thanh, Binh Nguyen Quoc, Du Dao Huy

10.14445/23488379/IJEEE-V11I11P132

How to Cite?

Vinh Nguyen Van, Hai Doan Thanh, Binh Nguyen Quoc, Du Dao Huy, "Reducing Effect of the Nonlinear Distortion in M-QAM OFDM System by Pilot-Based Automatic Phase Shift," SSRG International Journal of Electrical and Electronics Engineering, vol. 11,  no. 11, pp. 341-348, 2024. Crossref, https://doi.org/10.14445/23488379/IJEEE-V11I11P132

Abstract:

The very high PAPR of M-QAM OFDM systems makes them sensitive to nonlinear distortion caused by HPA, resulting in a steep drop in system performance. There are numerous ways to prevent nonlinear distortion in both the transmitter and the receiver. In OFDM systems, the pilot is used to estimate channels efficiently. It has been found that pilot can be used to help reduce the effect of nonlinear distortion in the system. The use of pilot tones to determine automatically the additional phase shift of subcarriers is presented in this paper. Without relying on the HPA or system specifications, the phase angle is automatically rotated based on the phase mismatch between the transmit and received pilots.

Keywords:

APS-pilot, HPA, Nonlinear distortion, OFDM.

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