正交型频率交替采样与重构方法研究

在频率维度对信号进行并行多通道的交替采样是提高系统采样率的一种重要手段，且每个通道均需要设计独立的模拟采样滤波器和数字重构滤波器以实现信号的分离获取及无失真恢复，结构及算法的复杂程度都偏高。该文提出一种基于正交变频的频率交替采样与重构方法，采样过程将输入信号划分为若干个子信道，利用正交下变频和采样滤波器将RF/IF信道分别搬移至基带并完成量化转换；重构过程则利用数字上变频变换将各信道恢复至其原有的载频位置并合成输出以恢复原始信号。该方法总体仅需在满足完美重构条件的前提下设计一个模拟采样滤波器和一个数字重构滤波器，实现简便。最后，通过实验验证对正交变频型频率交替采样与重构方法的有效性进行了阐述。

Research on an Orthogonal Frequency-Interleaved Sampling and Reconstruction Method

Multichannel sampling upon the frequency dimension is an important method to improve the overall sampling rate, where each channel needs to design an independent analog sampling filter and a digital reconfiguration filter to achieve the separation and undistorted recovery of the signal, resulting in high complexity of the structure and algorithm. In this paper, a method of frequency-interleaved sampling and reconstruction based on orthogonal frequency conversion is proposed. The sampling process divides the input signal into several sub-channels, where the radio frequency/intermediate frequency (RF/IF) channels are moved to the baseband by orthogonal mixing and sampling filter, and the quantization conversion is executed. The reconstruction process adopts digital up-conversion to move each channel back to its original carrier and obtain the output after frequency synthesis. The proposed method only needs one analog sampling filter and one digital reconstruction filter based on perfect reconstruction, which is more convenient for realization. Finally, the validity of the frequency-interleaved sampling and reconstruction method based on orthogonal frequency conversion is illustrated.