摘要
在异地多天线信号合成中,非同频采样会给合成性能带来损失,因此需要对信号间的采样频率偏差进行估计并补偿。提出了一种基于频域变换的信号采样频率偏差补偿方法,该方法根据采样频率偏差估计值对信号进行不同点数的DFT,通过在频域对齐信号的采样点来实现采样频率偏差的补偿,从而达到提高合成信号信噪比的目的。利用两路QPSK信号进行了仿真验证,给出了利用快速傅里叶变换来减小计算量的方案。结果表明,该算法能够较好地对采样频率偏差进行补偿,且能够通过选择不同的FFT算法来节省计算量,为采样频率偏差的补偿提供了新的解决思路。
In antenna signal composition from different sites, sampling at different frequencies will harm the composition performance, so it is necessary to estimate and compensate for the sampling frequency offset. A method is presented to compensate for the sampling frequency offset based on frequency-domain transformation （DFT）. DFTs of different points are referenced by the sampling frequency offset estimation, and the sampling points are aligned in frequency-domain to improve the SNR of the compensated signal. A program using FFT to reduce computation is validated by a two- way QPSK signal simulation. The result indicates that the compensating performance of this method is comparable to that of the time-domain, and the computation could be reduced by selecting differ- ent FFT algorithms. And this method offers a new solution to the compensation for sampling frequen- cy offset.
出处
《信息工程大学学报》
2012年第6期702-706,共5页
Journal of Information Engineering University
关键词
非同频采样
频率分辨率
频域变换
FFT
sampled at different frequency
frequency resolution
frequency-domain transformation
FFT
