检索结果-南通市图书馆

宅基地制度改革助推共同富裕的机理与实现路径

在线全文

学校读者我要写书评

暂无评论

农业经济问题 2024年第1期 84-94页

作者：牛坤在许恒周鲁艺天津大学管理与经济学部天津300072

农民农村发展落后是扎实推进共同富裕的短板。宅基地是农民的重要资产,宅基地制度改革是深化农村改革的重要内容,事关农民利益与农村社会稳定。但宅基地制度改革仍然处于探索的初级阶段,充分发挥制度潜能以助推共同富裕的机理与实现路... 详细信息

农民农村发展落后是扎实推进共同富裕的短板。宅基地是农民的重要资产,宅基地制度改革是深化农村改革的重要内容,事关农民利益与农村社会稳定。但宅基地制度改革仍然处于探索的初级阶段,充分发挥制度潜能以助推共同富裕的机理与实现路径还不明晰。因此,以宅基地“三权分置”改革为抓手,解构宅基地制度改革助推共同富裕的内在机理与实现路径,呼应了中国促进共同富裕的发展战略需求与深化宅基地制度改革的现实导向。研究发现,(1)以宅基地“三权分置”为基础和核心的宅基地制度改革,旨在通过放松产权管制,赋予城乡居民均等的财产化权利与发展机会,实现发展成果共享,与共同富裕具有内在统一性。(2)利用“环境—努力”二元因素机会不平等理论分析内在机理发现,宅基地制度改革不仅直接改善制度环境、村庄环境等机会不平等,还间接促进农民生计转型,从而助推共同富裕。(3)宅基地制度改革通过深化宅基地“三权分置”改革,推动城乡居民收入均衡化、公共服务水平提升和农民生计转型,推动共同富裕。未来如何因地制宜、合理借鉴宅基地改革中“三权分置”的实践经验,是有待进一步深入探讨的议题。

关键词：宅基地制度改革三权分置共同富裕机会不平等

Algebraic-Based Nonbinary LDPC Codes with Flexible Field Orders and Code Rates

在线全文

学校读者我要写书评

暂无评论

China Communications 2017年第4期14卷 111-119页

作者： hengzhou xu Dan Feng Cheng Sun Baoming Bai State Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 China Science and Technology on Communication Networks Laboratory Shijiazhuang 050081 China

In this paper, we study the rank of matrices over GF(2~p),and propose two construction methods for algebraic-based nonbinary LDPC codes from an existing LDPC code, referred to as the original code. By multiplying all elements of each column of the binary parity-check matrix H corresponding to the original code with the same nonzero element of any field, the first class of nonbinary LDPC codes with flexible field order is proposed. The second method is to replace the nonzero elements of some columns in H with different nonzero field elements in a given field, and then another class of nonbinary LDPC codes with various rates is obtained. Simulation results show that the proposed nonbinary LDPC codes perform well over the AWGN channel with the iterative decoding algorithms.

关键词： nonbinary LDPC codes algebraic-based LDPC codes rank iterative algorithms

Joint frequency-phase estimation for pilot-limited communication systems: a novel method based on length-variable auto-correlation operator

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第6期63卷 247-249页

作者： hengzhou xu Wenjing WEI Bo ZHANG Mengmeng xu Hai ZHU School of Network Engineering Zhoukou Normal University

Dear editor,Wireless communication systems, such as the fifth-generation (5G), unmanned aircraft vehicle,have widespread applications in our modern society [1–4]. This case will significantly decline available spectrum resources, thereby requiring us to provide some solutions. This study proposes a novel method for providing joint frequency-phase estimation for pilot-limited communication systems.

关键词： a novel method based on length-variable auto-correlation operator Joint frequency-phase estimation for pilot-limited communication systems

Two classes of QC-LDPC cycle codes approaching Gallager lower bound

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第10期62卷 217-219页

作者： hengzhou xu Huaan LI Mengmeng xu Dan FENG Hai ZHU School of Network Engineering Zhoukou Normal University State Key Laboratory of Integrated Services Networks Xidian University

Dear editor,Many research results show that, for equivalent bit length, short nonbinary LDPC codes outperform binary LDPC codes by about 1 dB[1–3]. Moreover, nonbinary LDPC codes have lower errorfloor, fast iterative decoding convergence, and strong ability of correcting burst errors. But the roadblock to their application is the high decoding complexity. Recently, significant studies on the low-complexity decoding algorithms of nonbi-

关键词： Two classes of QC-LDPC cycle codes approaching Gallager lower bound cycle

Construction of Short-Block Nonbinary LDPC Codes Based on Cyclic Codes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2017年第8期14卷 1-9页

作者： hengzhou xu Baoming Bai Min Zhu Bo Zhang Yulong Zhang School of Network Engineering Zhoukou Normal UniversityZhoukou 466001China State Key Laboratory of Integrated Service Networks Xidian UniversityXi'an 710071China Zhoukou Hydrology and Water Resoures Survey Bureau of Henan Province Zhoukou 466001China

In this paper, we focus on shortblock nonbinary LDPC(NB-LDPC) codes based on cyclic codes. Based on Tanner graphs' isomorphism, we present an efficient search algorithm for finding non-isomorphic binary cyclic LDPC codes. Notice that the parity-check matrix H of the resulting code is square and not of full rank, and its row weight and column weight are the same. By replacing the ones in the same column of H with a nonzero element of fi nite fi elds GF(q), a class of NB-LDPC codes over GF(q) is obtained. Numerical results show that the constructed codes perform well over the AWGN channel and have fast decoding convergence. Therefore, the proposed NB-LDPC codes provide a promising coding scheme for low-latency and high-reliability communications.

关键词： nonbinary LDPC codes tanner graph isomorphism iterative decoding

Nonbinary LDPC cycle codes: efficient search,design, and code optimization

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第8期61卷 231-233页

作者： hengzhou xu Chao CHEN Min ZHU Baoming BAI Bo ZHANG School of Network Engineering Zhoukou Normal University State Key Laboratory of Integrated Services Networks Xidian University School of Electronic Engineering Xidian University

Dear editor,Nonbinary low-density parity-check(NBLDPC)codes have the ability of approaching capacity when decoded iteratively using a probabilistic decoding *** the increase of the finite field size q,NBLDPC codes ove... 详细信息

关键词： cycle Nonbinary LDPC cycle codes efficient search,design

All Nearly 2-Regular Leaves of Partial 6-Cycle Systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2013年第6期33卷 653-665页

作者： Liqun PU hengzhou xu Hao SHEN School of Mathematics and Statistics Zhengzhou University Department of Mathematics Shanghai Jiao Tong University

Let Kn be a complete graph on n *** this paper,we find the necessary conditions for the existence of a 6-cycle system of Kn L for every nearly 2-regular leave L of *** condition is also sufcient when the number of ver... 详细信息

关键词： complete graph 6-cycle nearly 2-regular

On the Girth of Tanner (5,7) Quasi-Cyclic LDPC Codes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2017年第6期24卷 80-89页

作者： hengzhou xu Baoming Bai Dan Feng Cheng Sun State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China

The girth plays an important role in the design of LDPC codes. In order to determine the girth of Tanner(5,7) quasi-cyclic( QC) LDPC codes with length 7p for p being a prime with the form 35 m + 1,the cycles of lengths 4,6,8,and 10 are analyzed. Then these cycles are classified into sixteen categories,each of which can be expressed as an ordered block sequence,or a certain type. It is also shown that the existence of these cycles is equal to polynomial equations over Fpwho has a 35th unit root. We check if these polynomial equations have a 35th unit root and obtain the girth values of Tanner(5,7) QC LDPC codes.

关键词： LDPC codes quasi-cyclic Tanner graph girth

A Single-Event-Transient Hardened Phase Locked Loop for Clock and Data Recovery

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第2期33卷 353-361页

作者： hengzhou YUAN Bin LIANG Hao SANG Weixia xu Yang GUO Xi CHEN National University of Defense Technology

A radiation-hardened phase-locked loop is proposed for phase interpolator clock and data recovery purposes. A sensitive node-compressed charge pump and multi-node cross coupling voltage-controlled oscillators are proposed in this phase-locked loop with the goal of achieving good jitter performance and improving anti-SET（SET,single-event transient） capability. The root mean square（RMS） jitter of the phase-locked loop is reduced from 3.7 ps to 2.58 ps at 2 GHz, while the laser threshold is improved from 120 p J to 370 p J compared to the unhardened phaselocked loop. The hardened phase-locked loop also does not lose its lock state from linear energy transfers（LETs） of 3.3 to 37.3 Me V·cm2/mg.

关键词： Charge pumps Voltage-controlled oscillators Energy exchange Noise Lasers Jitter Phase locked loops