Data-Aided Frequency Offset Estimation for CE-OFDM Broadband Satellite Systems

Applied Sciences

Wang Weidong¹  Wang Cheng¹  Cao Yushi¹ 

[1] School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;

关键词: carrier frequency offset;    CE-OFDM;    OFDM;    broadband satellite;   

DOI  :  10.3390/app9112310

来源: DOAJ

【 摘 要 】

In recent years, the constant-envelope orthogonal frequency-division multiplexing (CE-OFDM) has been considered as a candidate waveform in broadband satellite systems as it has a 0-dB peak-to-average power ratio (PAPR). However, the carrier frequency offset (CFO) estimation scheme for CE-OFDM broadband satellite systems directly affects system performance. In this paper, we analyze the network architecture and the propagation environment of CE-OFDM broadband satellite systems, and we propose a data-aided CFO estimation strategy based on the frequency domain pilot symbols. The Cramer−Rao bound (CRB) of our CFO estimator is given by mathematical analysis, and the effect of the number of pilot symbols on the estimation performance is analyzed. The pilot symbol-based CFO estimator is composed of a phase demodulator and a discrete Fourier transform (DFT) module, and it can obtain a large estimation range under a small pilot overhead. The simulation results show that the CE-OFDM broadband satellite systems can achieve a good bit error rate (BER) performance by using the proposed strategy to estimate and compensate the CFO.

【 授权许可】

Unknown