In this paper, we focus on the design of irregular QC-LDPC code based multi-level coded modulation(MLCM) scheme by jointly optimizing the component code rate and the degree distribution of the irregular QC-LDPC compon...In this paper, we focus on the design of irregular QC-LDPC code based multi-level coded modulation(MLCM) scheme by jointly optimizing the component code rate and the degree distribution of the irregular QC-LDPC component code. Firstly, the sub-channel capacities of MLCM systems is analyzed and discussed, based on which the optimal component code rate can be obtained. Secondly, an extrinsic information transfer chart based two-stage searching algorithm is proposed to find the good irregular QC-LDPC code ensembles with optimal component code rates for their corresponding sub-channels. Finally, by constructing the irregular QC-LDPC component codes from the designed ensembles with the aim of possibly enlarging the girth and reducing the number of the shortest cycles, the designed irregular QC-LDPC code based 16QAM and 64QAM MLCM systems can achieve 0.4 dB and 1.2 dB net coding gain, respectively, compared with the recently proposed regular QC-LDPC code based 16QAM and 64QAM MLCM systems.展开更多
低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地...低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地域协作和多种开发形式。越来越多的企业青睐这种无代码或低代码的信息系统开发,既能够敏捷响应业务需求、快速搭建应用系统,又能降低企业开发成本和运维成本。通过低代码平台设计实现基于领域模型驱动的井筒工艺数据采集平台,构建新一代支持云端部署、PC端、移动端等多终端自适应屏幕的应用,弹性伸缩资源调配,提供更稳定、高效的企业级数据采集应用平台,解决数据多系统分散采集、效率低下等问题,为企业数字化转型提供数据要素的支持。展开更多
基金supported by National Natural Science Foundation of China(No.61571061)
文摘In this paper, we focus on the design of irregular QC-LDPC code based multi-level coded modulation(MLCM) scheme by jointly optimizing the component code rate and the degree distribution of the irregular QC-LDPC component code. Firstly, the sub-channel capacities of MLCM systems is analyzed and discussed, based on which the optimal component code rate can be obtained. Secondly, an extrinsic information transfer chart based two-stage searching algorithm is proposed to find the good irregular QC-LDPC code ensembles with optimal component code rates for their corresponding sub-channels. Finally, by constructing the irregular QC-LDPC component codes from the designed ensembles with the aim of possibly enlarging the girth and reducing the number of the shortest cycles, the designed irregular QC-LDPC code based 16QAM and 64QAM MLCM systems can achieve 0.4 dB and 1.2 dB net coding gain, respectively, compared with the recently proposed regular QC-LDPC code based 16QAM and 64QAM MLCM systems.
文摘低代码平台(Low-Code Development Platform,LCDP)是近些年发展起来,敏捷响应企业业务需求迭代发展和支撑企业数字化转型的一项新技术。友好的可视化环境,图形化拖曳式配置操作界面,开发工作的自助化、敏捷化、扁平化,满足了多团队跨地域协作和多种开发形式。越来越多的企业青睐这种无代码或低代码的信息系统开发,既能够敏捷响应业务需求、快速搭建应用系统,又能降低企业开发成本和运维成本。通过低代码平台设计实现基于领域模型驱动的井筒工艺数据采集平台,构建新一代支持云端部署、PC端、移动端等多终端自适应屏幕的应用,弹性伸缩资源调配,提供更稳定、高效的企业级数据采集应用平台,解决数据多系统分散采集、效率低下等问题,为企业数字化转型提供数据要素的支持。
