A Novel Multi-Channel Mismatch Estimation Method for Parallel Time-Interleaved System
MA Lun1,2, LIAO Gui-sheng2, YANG Peng1, MING Yang1
1. School of Information Engineering, Chang'an University, Xi'an, Shaanxi 710064, China; 2. National Lab of Radar Signal Processing, Xidian University, Xi'an, Shaanxi 710071, China
Abstract：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.
马仑, 廖桂生, 杨鹏, 明洋. 一种新的并行交替采样系统误差估计方法[J]. 电子学报, 2014, 42(5): 912-917.
MA Lun, LIAO Gui-sheng, YANG Peng, MING Yang. A Novel Multi-Channel Mismatch Estimation Method for Parallel Time-Interleaved System. Chinese Journal of Electronics, 2014, 42(5): 912-917.
[1] Carlos G,Aguayo R.Understanding the software communications architecture[J].IEEE Communications Magazine,2009,47(9):50-57. [2] Vogel C.The impact of combined channel mismatch effects in time-interleaved ADCs[J].IEEE Trans on Instrumentation and Measurement,2005,54 (1):415-427. [3] Jenq Y C.Digital spectra of nonuniformly sampled signals:a robust sampling time offset estimation algorithm for ultra high-speed waveform digitizers using interleaving[J].IEEE Trans on Instrumentationand Measurement,1990,39(1):71-75. [4] Haihong T,Guisheng L,et al.Integer coded genetic algorithm design of staggered sampling MTI[A].Neural Networks & Signal Processing[C].Nanjing:IEEE Catalog 2003,558-562. [5] 梁志国,朱济杰.数据采集系统通道间延迟时间差的精确评价[J].仪器仪表学报,1999,20(6):619-623. Liang Zhiguo,Zhu Jijie.The evaluation of channel delay of data acquisition systems[J].Chinese Journal of Scientific Instrument,1999,20(6):619-623.(in Chinese) [6] 叶梵，曾浩，等.一种高速并行采样实时校正方法研究[J].电子学报，2013，41(1):166-170. Ye Peng,Zeng Hao,et al.Research on real-time calibration technology for high-speedparallel sampling[J].Acta Electronica Sinica,2013,41(1):166-170.(in Chinese) [7] Elbornsson J,Gustafsson F,et al.Blind Equalization of Time Errors in a Time-Interleaved ADC System[J].IEEE Transactions on Signal Processing,2005,53(4):1413-1424. [8] Haftbaradaran A,Martin K W.A background sample-time error calibration technique using random data for wide-band high-resolution[J].IEEE Transactions on Signal Processing,2008,55(3):234-238. [9] Vitali S,Cimatti G,et al.Algorithmic ADC offset compensation by nonwhite data chopping:system model and basic theoretical results[J].IEEE Transactions on Circuits and Systems,2008,55(6):1615-1627. [10] 田书林,潘卉青,等.一种并行采样中的自适应非均匀综合校准方法[J].电子学报,2009,37(10):2298-2301. Tian Shulin,Pan Huiqing,et al.An adaptive synthesis calibration method for time delay of sampling systems[J].Acta Electronica Sinica，2009,37(10):2298-2301.(in Chinese) [11] 马仑,廖桂生，等.基于子空间投影的并行交替采样误差估计[J].系统工程与电子技术,2012,34(9):679-684. Ma Lun,Liao Guisheng,et al.Mismatch estimation for parallel time-interleaved sampling system based on subspace projection[J].Systems Engineering and Electronics,2012,34(9):679-684.(in Chinese) [12] 邓琳,吕幼新,等.并行采集系统通道失配误差测量及校正[J].电子科技大学学报,2006,35(3),313-316. Deng Lin,Lü Youxin,et al.Measurement and calibration of channel mismatch errors in time-interleaved ADC[J].Journal of University of Electronic Science and Technology of China,2006,35(3),313-316.(in Chinese) [13] 张贤达.矩阵分析与应用[M].北京:清华大学出版社,2004.657-660. [14] Schmidt R O.Multiple emitter location and signal parameter estimation[J].IEEE Transactions on Antennas and Propagation,1986,34(3):276-280. [15] Song V C.Array signal processing under model errors with applications to speech separation[D].Dept Elect Eng,Univ Nortre Dame,USA,1992.
2014, Vol. 42 
