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 robust to residual offset errors and system noise.The effectiveness of the proposed approach is verified by simulated data.