CAJ | 학술논문

并行交替采样系统的性能依赖于各通道的精确配合，相对于传统单通道采样系统，其面临更多的系统误差源。未补偿的失配误差将导致采样波形非线性失真、输出信噪比降低以及无伪峰动态范围损失等。本文提出了一种新的并行交替采样系统误差校正方法，在频域利用相邻频率点输出矢量对应信号子空间的旋转关系和正交投影矩阵的唯一性，实现增益误差以及时基误差的精确估计。该方法无需迭代，估计精度较高，对噪声以及偏置误差稳健，并且可以同时完成信号重构。仿真数据的处理结果验证了本文方法的有效性。
병행교체채양계통적성능의뢰우각통도적정학배합，상대우전통단통도채양계통，기면림경다적계통오차원。미보상적실배오차장도치채양파형비선성실진、수출신조비강저이급무위봉동태범위손실등。본문제출료일충신적병행교체채양계통오차교정방법，재빈역이용상린빈솔점수출시량대응신호자공간적선전관계화정교투영구진적유일성，실현증익오차이급시기오차적정학고계。해방법무수질대，고계정도교고，대조성이급편치오차은건，병차가이동시완성신호중구。방진수거적처리결과험증료본문방법적유효성。
A major bottleneck in realizing a time-interleaved system is mismatches among the sub-ADCs ,which may greatly degrade the receiver performance .In this paper ,we investigated a novel mismatch estimation method ,in which the coupling between time errors and gain errors is solved by using the rotational relationship between the signal subspaces with respect to two adjacent frequency bins .The decoupled mismatch errors can be estimated accurately free of iteration .Moreover ,the presented method is ro-bust to residual offset errors and system noise .The effectiveness of the proposed approach is verified by simulated data .