Frequency Offset Compensation for Satellite Communication System with CE-OFDM
Frequency Offset Compensation for Satellite Communication System with CE-OFDM
复制标题
CE-OFDM卫星通信系统频偏补偿
DOI：
10.1109/cc.2017.8014351
复制
发表时间：
2017
影响因子：
4.1
通讯作者：
张英海
中科院分区：
文献类型：
--
作者：
崔高峰;王程;王卫东;张英海
恒定包络正交频分复用（CE - OFDM）是一种能够实现0dB峰均功率比并避免非线性功率放大器导致的信号失真的波形。然而，CE - OFDM系统中的载波频率偏移（CFO）会在相位解缠模块中产生误差。在本文中，针对卫星通信系统中的CE - OFDM提出了一种CFO估计方案。由于在发射端共轭对称符号结构中存在零子载波，所提方案利用零子载波作为先验信息在接收端估计CFO。通过数学分析得到了归一化CFO的理想估计范围。仿真结果表明，所提方案在加性高斯白噪声（AWGN）信道和多径衰落信道下都能准确估计CFO，尤其在中高信噪比（SNR）情况下。
Constant envelope orthogonal frequency division multiplexing (CE-OFDM) is a waveform that can achieve 0dB peak-to-average power ratio and avoid the signal distortion caused by the nonlinear power amplifer. However, the carrier frequency offset (CFO) in CE-OFDM systems can cause errors at phase unwrapper module. In this paper, a CFO estimation scheme is proposed for CE-OFDM in satellite communication system. As the null subcarrier is inherent in the conjugate.symmetric symbol structure at the transmitter, the proposed scheme uses the null subcarrier as prior information to estimate the CFO at the receiver. The ideal estimation range of normalized CFO is obtained by mathematical analysis. Simulation results show that the proposed scheme can estimate the CFO accurately under additive white Gaussian noise (AWGN) channel and multipath fading channel, especially for moderate and high signal-to-noise ratio (SNR).