统计分析了西部地区某高职高专院校英语读书报告中同伴识别和修改的错误。结果发现:纠错类型中除了Larsen-Freeman and long(2000)归纳的二语习得偏误类型外,还存在其他偏误;学生的纠错意识和能力较弱且主要集中在句子内部;外语学习过...统计分析了西部地区某高职高专院校英语读书报告中同伴识别和修改的错误。结果发现:纠错类型中除了Larsen-Freeman and long(2000)归纳的二语习得偏误类型外,还存在其他偏误;学生的纠错意识和能力较弱且主要集中在句子内部;外语学习过程中也会发生磨蚀现象。展开更多
After the development trend of high-speed long-haul optical communication systems and the theory of the concatenated code are analyzed,the comparative researches on the performances of the two concatenated codes of th...After the development trend of high-speed long-haul optical communication systems and the theory of the concatenated code are analyzed,the comparative researches on the performances of the two concatenated codes of the inner-outer type and the improved interleaving type are performed in detail.The theoretical analyses and simulation results show that the inner-outer type concatenated code has the greater redundancy,and the improved interleaving type concatenated code is a superior concatenated code with the advantages of the better error correction performance,moderate redundancy and easy implementation.As a result,the improved interleaving type concatenated code can be better used in high-speed long-haul optical communication systems.展开更多
基金supported by the National Natural Science Foundation of China (Nos.61071117 and 61003256)the Natural Science Foundation of CQ CSTC (No.2010BB2409)the Science and Technology Foundation of Chongqing Municipal Education Commission (No.KJ110519)
文摘After the development trend of high-speed long-haul optical communication systems and the theory of the concatenated code are analyzed,the comparative researches on the performances of the two concatenated codes of the inner-outer type and the improved interleaving type are performed in detail.The theoretical analyses and simulation results show that the inner-outer type concatenated code has the greater redundancy,and the improved interleaving type concatenated code is a superior concatenated code with the advantages of the better error correction performance,moderate redundancy and easy implementation.As a result,the improved interleaving type concatenated code can be better used in high-speed long-haul optical communication systems.