State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 China;
State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 China;
State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 China;
State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou 450001 China;
China National Digital Switching System Engineering and Technological R&D Center Zhengzhou 450002 China;