一、问题的提出
学术教育和职业教育的整合（Integrating of Academic and Occupational/Vocational Education）这一提法最早是由美国学者提出来的。这里，学术教育不同于我们通常意义上常说的普通教育，学术教育和职业教育的整合更...一、问题的提出
学术教育和职业教育的整合（Integrating of Academic and Occupational/Vocational Education）这一提法最早是由美国学者提出来的。这里，学术教育不同于我们通常意义上常说的普通教育，学术教育和职业教育的整合更与“普通教育和职业教育的沟通或渗透”这些提法有别。根据美国等国家把中学分为职业科、学术科、普通科三科的划分法，笔者以为，从各自的课程设置比例来说，职业科以普通课程和技术课程为主体，同时开设有少量的实践课程，它主要为学生毕业后直接就业做好准备。学术科中语言、社会科学、数学、科学和外国语等普通课程的比例占绝对优势，其次开设少量的实践课程，不开设技术课程，它主要为学生升人大学做好准备。展开更多
This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding(BICM-ID).The symbol mapping is composed of two QPSK with different radiuses and phases,called cross equalization-...This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding(BICM-ID).The symbol mapping is composed of two QPSK with different radiuses and phases,called cross equalization-8PSK-quasi-semi set partitioning(CE-8PSK-Quasi-SSP).Providing the same average power,the proposed scheme can increase the minimum squared Euclidean distance(MSED)and then improve the receiving performance of BICM-ID compared with conventional symbol mapping schemes.Simultaneously,a modified iteration decoding algorithm is proposed in this paper.In the process of iteration decoding,different proportion of the extrinsic information to the systematic observations results in distinct decoding performance.At high SNR(4~9dB),the observation information plays a more important role than the extrinsic information.Simulation results show that the proportion set at 1.2 is more suitable for the novel mapping in BICM-ID.When the BER is 10^(-4),more than 0.9dB coding gain over Rayleigh channels can be achieved for the improved mapping and decoding scheme.展开更多
文摘一、问题的提出
学术教育和职业教育的整合（Integrating of Academic and Occupational/Vocational Education）这一提法最早是由美国学者提出来的。这里，学术教育不同于我们通常意义上常说的普通教育，学术教育和职业教育的整合更与“普通教育和职业教育的沟通或渗透”这些提法有别。根据美国等国家把中学分为职业科、学术科、普通科三科的划分法，笔者以为，从各自的课程设置比例来说，职业科以普通课程和技术课程为主体，同时开设有少量的实践课程，它主要为学生毕业后直接就业做好准备。学术科中语言、社会科学、数学、科学和外国语等普通课程的比例占绝对优势，其次开设少量的实践课程，不开设技术课程，它主要为学生升人大学做好准备。
基金Supported by the Key Project of Chinese Ministry of Education(No.106042)the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry(2007[24])
文摘This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding(BICM-ID).The symbol mapping is composed of two QPSK with different radiuses and phases,called cross equalization-8PSK-quasi-semi set partitioning(CE-8PSK-Quasi-SSP).Providing the same average power,the proposed scheme can increase the minimum squared Euclidean distance(MSED)and then improve the receiving performance of BICM-ID compared with conventional symbol mapping schemes.Simultaneously,a modified iteration decoding algorithm is proposed in this paper.In the process of iteration decoding,different proportion of the extrinsic information to the systematic observations results in distinct decoding performance.At high SNR(4~9dB),the observation information plays a more important role than the extrinsic information.Simulation results show that the proportion set at 1.2 is more suitable for the novel mapping in BICM-ID.When the BER is 10^(-4),more than 0.9dB coding gain over Rayleigh channels can be achieved for the improved mapping and decoding scheme.
