Probability Distribution Analysis of M-QAM Modulated OFDM Symbol and Reconstruction of Distorted Data

Hyunseuk Yoo (1, 2) , Frédéric Guilloud (3, 1) , Ramesh Pyndiah (3, 1)

1 SC - Département Signal et Communications
2 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)
3 Lab-STICC_TB_CACS_COM

It is usually assumed that N samples of the time domain OFDM symbols have an identical Gaussian Probability Distribution (PD) in the real and imaginary parts. In this paper, we analyze the exact PD of M-QAM/OFDM symbols with N subcarriers. We show the general expression of the characteristic function of the time domain samples of M-QAM/OFDM symbols. As an example, theoretical discrete PD for both QPSK and 16-QAM cases is derived. The discrete nature of these distributions is used to reconstruct the distorted OFDM symbols due to deliberate clipping or amplification close to saturation. Simulation results show that the data reconstruction process can effectively lower the error floor level.

Mots clés: OFDM; Discrete Probability Distribution; M-QAM; Non-linear amplifier; Data reconstruction

Domaines: Traitement du signal et de l'image [eess.SP]

Hyunseuk Yoo, Frédéric Guilloud, Ramesh Pyndiah. Probability Distribution Analysis of M-QAM Modulated OFDM Symbol and Reconstruction of Distorted Data. EURASIP Journal on Advances in Signal Processing, 2011. ⟨hal-00704178⟩