Archievements: |
Main Research Grants: (1) "Two-dimension based algorithms for the weighted least squares designs of two-dimensional linear-phase FIR digital filters ", Shandong Provincial National Nature Science Foundation of China (11/2010-11/2013, Grant Number: ZR2010FQ016, Project leader). (2) "Two-dimension based algorithms for the optimal designs of two-dimensional FIR digital filters", National Natural Science Foundation of China (01/2014-12/2016, Grant Number: 61304142, Project leader). (3) "Constrained weighted least squares method for the constrained minimax design of IIR digital filters", National Natural Science Foundation of China (01/2007-12/2009, Grant Number: 60675004, Second participant). (4) "Theory and algorithm for the design of FIR filters with low group delays", National Natural Science Foundation of China (01/2010-12/2012, Grant Number: 60974102, Second participant). (5) "Theory and algorithm for the design of 1-D and 2-D FIR filters with low group delays", Zhejiang Provincial National Natural Science Foundation of China (01/2010-12/2011, Grant Number: Y1090109, Second participant). (6) "Sequential minimization method for the designs of stable 1-D and 2-D IIR digital filters", National Natural Science Foundation of China (01/2012-12/2015, Grant Number: 61175001, Second participant). (7) "Minimax weighted phase error designs of stable IIR digital filters with constant group delays", National Natural Science Foundation of China (01/2016-12/2019, Grant Number: 61573123, Second participant). Publications: Journal Papers: [1] X. P. Lai and R. J. Zhao, “On Chebyshev design of linear-phase FIR filters with frequency inequality constraints”, IEEE Trans. Circuits and Systems-II, vol. 53, no. 2, pp. 120-124, Feb. 2006. (SCI) [2] R. J. Zhao and X. P. Lai, “Chebyshev design of complex FIR digital filters with magnitude constraints,” Acta Electronica Sinica, vol. 34, pp. 1694-1699, Sep. 2006. (EI) [3] R. J. Zhao and X. P. Lai, “Chebyshev design of linear-phase FIR filters with linear equality constraints”, IEEE Trans. Circuits and Systems-II, vol. 54, no. 6, pp. 494-498, Jun. 2007. (SCI) [4] X. P. Lai and R. J. Zhao, “Minimax design of time-domain constrained fir filters by a sequential constrained least-square method”, Chinese Journal of Electronics, vol. 18, No. 1, pp. 166-170, Jan. 2009. (SCI) [5] R. J. Zhao and X. P. Lai, “A fast matrix iterative technique for the WLS design of 2-D quadrantally symmetic FIR filters”, Multidimensional Systems and Signal Processing, vol. 22, no. 4, pp. 303-317, Dec. 2011. (SCI) [6] X. P. Lai, C. L. Lai and R. J. Zhao, “A iterative approach to near-uniform group-delay error design of FIR filters”, IEEE Signal processing letters, vol. 18, no. 2, pp. 107-110, Feb. 2011. (SCI) [7] R. J. Zhao and X. P. Lai, “Theory and design of linear-phase minimax FIR filters with mixed constraints in the frequency domain”, Circuits, systems, and Signal Processing, vol. 32, no. 1, pp. 183-203, Feb. 2013. (SCI) [8] R. J. Zhao and X. P. Lai, “Efficient 2-D based algorithms for WLS designs of 2-D FIR filters with arbitrary weighting functions”, Multidimensional Systems and Signal Processing, vol. 24, no. 3, pp. 417-434, Sep. 2013. (SCI) [9] R. J. Zhao and X. P. Lai, “Fast two-dimensional weighted least squares techniques for the design of two-dimensional finite impulse response Filters”, Journal of Control Theory and Applications, vol. 11, no. 2, pp. 180-185, 2013. (EI) [10] X. Y. Hong, X. P. Lai and R. J. Zhao, “Matrix-based algorithms for constrained least-squares and minimax designs of 2-D FIR filters”, IEEE Transactions on Signal Processing, vol. 61, No. 14, pp. 3620- 3631, Jul. 2013. (SCI) [11] R. J. Zhao, X. P. Lai and Z. P. Lin, “Weighted least squares design of 2-D FIR filters using a matrix-based generalized conjugate gradient method”, Journal of the Franklin Institute, vol. 353, no. 8, pp. 1759-1780, 2016. (SCI) [12] X. Y. Hong, X. P. Lai and R. J. Zhao “A fast design algorithm for elliptic-error and phase-error constrained LS 2-D FIR filters”, Multidimensional Systems and Signal Processing, vol. 27, no. 2, pp. 477-491, Apr. 2016. (SCI) [13] R. J. Zhao, X. P. Lai, X. Y. Hong and Z. P. Lin, “A matrix-based IRLS algorithm for the least lp-norm design of 2-D FIR filters”, Multidimensional Systems and Signal Processing, vol. 30, no. 1, pp. 1-15, Jan. 2019. (SCI) [14] R. J. Zhao, X. P. Lai, D. B. H. Tay and Z. P. Lin, “An alternating variable technique for the constrained minimax design of frequency-response-masking filters”, Circuits, systems, and Signal Processing, vol. 38, no. 2, pp. 827-846, Feb. 2019. (SCI) [15] R. J. Zhao and X. Y. Hong, “Matrix-based Algorithms for the Optimal Design of Variable Fractional Delay FIR Filters”, IEEE Trans. Circuits and Systems-I, in press. DOI: 10.1109/TCSI.2019.2934140. Selected Conference Papers: [1] R. J. Zhao and X. P. Lai, “Chebyshev design of complex FIR filters with equality-and-inequality constraints in frequency domain”, Proc. IEEE Int. Conf. Intelligent Computation Technology and Automation, Zhangjianjie, China, vol. 1, pp. 557-561, Oct. 2009. (EI) [2] R. J. Zhao and X. P. Lai, “On the WLS design of 2-D quadrantally symmetric FIR filters with arbitrary weighting functions”, 3rd International Symposium on Systems and Control in Aeronautics and Astronautics, Harbin, China, pp. 697-701, Jun. 2010. (EI) [3] R. J. Zhao and X. P. Lai, “A fast matrix iterative algorithm for WLS design of 2-D linear-phase FIR filters”, 8th World Congress on Intelligent Control and Automation, Jinan, China, pp. 1135-1139, Jul. 2010.(EI) [4] R. J. Zhao and X. P. Lai, “Fast two-dimensional WLS techniques for the design of two-dimensioinal FIR Filters”, 30th Chinese Control Conference, Yantai, China, pp. 3034-3039, Jul. 2011. (EI) [5] R. J. Zhao and X. P. Lai, “An efficient matrix iterative algorithm for the WLS design of 2-D FIR filters”, IEEE International Symposium on Circuits and Systems, Beijing, China, pp. 2932-2935, May 2013. (EI) [6] R. J. Zhao and X. P. Lai, “A new iterative reweighted least squares algorithm for the design of FIR filters”, 9th International Conference on Information, Communications and Signal Processing, Tainan, Taiwan, Nov. 2013. (EI) [7] R. J. Zhao, “WLS design of centro-symmetric 2-D FIR filters using matrix iterative algorithm”, 20th IEEE International Conference on Digital Signal Processing, Singapore, pp. 34-38, Jul. 2015. (EI) [8] R. J. Zhao and X. Y. Hong, “An efficient matrix-based algorithm for the WLS design of 2-D FIR filters with centrally symmetric or antisymmetric response”, 34th Chinese Control Conference, Hangzhou, China, pp. 4699-4703, Jul. 2015. (EI) [9] R. J. Zhao, X.P. Lai, Z.P. Lin,“A matrix iterative algorithm for the WLS design of variable fractional delay FIR filters”, 2016 IEEE International Conference on Digital Signal Processing, Beijing, China, pp. 632-636, Oct. 2016. (EI) [10] R. J. Zhao, Z. P. Lin, K. A. Toh, L. Sun, X. P. Lai, “Almost minimax design of FIR filter using an IRLS algorithm without matrix inversion”, 2nd International Workshop on Pattern Recognition, IWPR 2017, Singapore, pp. 1-5, May, 2017. (EI) [11] R. J. Zhao, X. P. Lai and Z. P. Lin, “An iterative reweighted minimax algorithm for the design of FRM-based two-channel QMF banks”, 2018 IEEE International Symposium on Circuits and Systems (ISCAS), Florence, Italy, pp. 1-5, May, 2018. (EI) [12] R. J. Zhao, X.P. Lai, Z. P. Lin, Z. F. Gao, “A bi-matrix-based conjugate gradient algorithm for the WLS Design of centro-symmetric 2-D FIR filters”, 2018 IEEE International Conference on Digital Signal Processing, Shanghai, China, pp. 1-5, Nov. 2018. (EI) |
