A new construction for n-track (d, k) codes with redundancy

A new construction for n-track (d, k) codes with redundancy r, referred to as (d, k; n, r) codes, is presented. This construction applies single-track (d, k+Δk) codes (with certain extra constraints and appropriate amounts of delay) on each of the n tracks. This construction achieves a large part of the capacity increases possible when using (d, k; n, r) codes, has simple encoders and decoders, and exhibits considerable robustness to faulty tracks. It is shown that under this construction, (d, k; n, r) codes can achieve at least (n-r-1:)/n*100% of the gap in capacity between conventional (d, k) and (d, ∞) codes. Several practical examples of (d, k; n, r) codes under this construction are presented     

我校电工电子教学基地的运行机制与建设

我校电工电子教学基地（以下简称基地）经过历时五年的建设，现已被具规模。尽管我们对基地建设和运作经验不足，但我们以认真负责的精神，稳步推进教学基地的建设，取得了较好的建设成果，主要是：（1）基地建设改善了办学条件；（2）基地建设推动了电工电子类课程教学体系改革；（3）基地建设确立了新的运行机制，由此，我们体会到，教学基地的建设，确定是教育部继国家重点实验室，重点学科建设之后，在工程教育方面组织的重大改革。     

光通信系统中基于伽罗华域乘群的QC-LDPC码的一种新颖构造方法

基于Galois域GF(q)乘群,提出了一种构造简单且编码容易实现的新颖准循环低密度奇偶校验(QC-LDPC)码构造方法,可灵活地调整码长、码率,且编译码复杂度低。用本文方法构造了适用于光通信系统的非规则QC-LDPC(3843,3603)码,仿真表明,与已广泛用于光通信系统中的经典RS(255,239)码相比,用本文方法构造的码具有更好的纠错性能,且其性能优于用SCG方法构造的LDPC码和规则的QC-LDPC(4221,3956)码,适合用于高速长距离光通信系统。     

同类2FSK混合信号中微弱信号提取方法研究

针对光传输系统的特点与要求, 基于有限域提出了一种新颖的扩展非规则重复累积准循环低密度奇偶校验码(eIRA-QC-LDPC)构造方法, 该构造方法可根据实际需要灵活地调整码长码率, 利用此方法构造了一种码率为0.937的novel-eIRA-QC-LDPC(4599,4307)码。仿真结果表明: 在误码率(BER)为10-7且码率均为0.937的情况下, 该novel-eIRA-QC-LDPC(4599,4307)码比ITU-T G.975中RS(255,239)码和ITU-T G.975.1中LDPC(32640,30592)码的净编码增益(NCG)分别改善了约2.13和1.33dB, 比用SCG构造方法构造的SCG-eIRA-LDPC(3717,3481)码和基于阵列码构造方法构造的Array-eIRA-QC-LDPC(4560,4275)码的净编码增益分别提高了约0.24和0.41dB, 距离香农限约1.07dB。因而该构造方法所构造的eIRA-QC-LDPC码具有更好的纠错性能, 更适合高速长距离的光传输系统。     

光通信中一种基于有限域的QC-LDPC码构造方法分析

针对光通信系统日益发展的需要,提出了一种的基于有限域准循环低密度奇偶校验(QC-LDPC)码的构造方法.该构造方法简单易行,可以有效避免四环的出现,具有良好的围长特性,同时能够自由地选择码长码率.仿真分析表明:通过该构造方法所构造的码率为93.7％的QC-LDPC(3780,3540)码的纠错性能优于利用随机构造方法所构造的SCG-LDPC (3969,3720)码和已广泛用于ITU-T G.975中的RS(255,239)码和ITU-T G.975.1中的LDPC(32640,30592)码,因而其更适合于光通信系统.     

Difference set codes: codes with squared Euclidean distance of sixfor partial response channels

We present a new construction of block codes for the (1-D)-PR (partial response) channel. The codewords in the code correspond to constant-sum subsets of a difference set. It is shown that at the output of a noiseless (1-D)-PR channel; the minimum squared Euclidean distance of such a code is at least six, compared to two for the uncoded system. This construction yields larger code rates than previously known codes with the same minimum distance for large code lengths. The construction technique also imposes upper bounds on the decoding complexity of the codes     

On Construction of the$(24, 12, 8)$Golay Codes

Two product array codes are used to construct the (24,12,8) binary Golay code through the direct sum operation. This construction provides a systematic way to find proper (8,4,4) linear block component codes for generating the Golay code, and it generates and extends previously existing methods that use a similar construction framework. The code constructed is simple to decode     

Algebraic Construction of Quasi-Cyclic LDPC Codes for the AWGN and Erasure Channels

This paper is concerned with construction of quasi-cyclic (QC) low-density parity-check (LDPC) codes for three different types of channels: the additive white Gaussian noise, the binary random erasure, and the binary burst erasure channels. Two algebraic methods for systematic construction of QC-LDPC codes are presented. Codes constructed perform well over all three types of channels.     

电气工程专业方向建设中的几点探索

介绍了我系“电气工程系列课程建设”教改课题中对电气工程专业方向所作的四点探索：(1)强化电气工程设计，(2)充实课堂教学材料，(3)完善实践教学环节，(4)突出综合应用能力培养。以期得到业界领导和同行的关注、支持和指导。     

“互联网+”时代高校智慧校园建设与应用探析

“互联网+”智慧校园建设与应用意味着互联网与传统高校教学、管理、服务等方面更为深度的有效融合,本文积极构建了“互联网+”时代高校智慧校园“4F+6P”建设与应用驱动模型,4F(Form)为“互联网+”智慧校园建设策略需要构建新的数据形态、技术形态、组织形态与关系形态,6P(Program)“互联网+”智慧校园应用内容需要打造的6项工程,通过构建“形态+工程”模型驱动“互联网+”智慧校园建设与应用进入新的发展阶段。     

A Multicast Tree Construction Algorithm for Large Multiparty Conferences

This paper introduces the Multiple Distribution Point (MDP) approach to the construction of multicast trees in computer networks. The MDP approach focuses on the creation of multicast trees for large multiparty conference situations where a high percentage (possibly all) of the participants wish to source multicast data. For certain evaluation criteria, the MDP algorithm is shown to perform better than existing multicast tree construction methods.     

Are Construction Disputes Inevitable?

Many construction projects are of long-duration and high value and foreseeing and planning for every eventuality may be impossible. Engineers and managers are expected to solve problems surfacing during the execution stage. Moreover, problems blended with conflict are damaging and manifest as disputes. The authors suggested that construction dispute can be conceptualized as having three basic components: contract provisions, triggering events and conflict. This conceptualization fits nicely with fault tree (FT) framework that is used to evaluate system failures. Furthermore, through the use of a hypothetical case, a fuzzy FT model was employed to analyze the likelihood of construction dispute. This research suggested that complex project delivered in the traditional design then build approach, construction dispute are bound to appear.     

基于欧氏几何的LDPC码构造方法

基于有限几何的低密度奇偶校验码(LDPC)是一种极具实用价值的码型。首先介绍了LD-PC码的原理和基本的构造方法,然后介绍了欧氏有限几何的概念,提出了一种构造欧氏有限几何LDPC码的方法,最后提出了对EG码字的改进方法。     

区(县)级融媒体建设的路径探索

随着全国各级尤其是区(县)级融媒体建设的蓬勃发展,涌现出了一大批融媒体建设的先进典型和事例,创造出不少先进模式和方式方法。但总体来看,真正创新之举不多,建设与发展路径也大体相同。文章以刚刚建成的山东省日照市岚山区融媒体中心为例,揭示如何由需求分析入手,从高起点规划,高标准建设到再造业务流程,实现全媒体深度融合,走出了一条新的区(县)级融媒体建设之路。     

Construction of compressed sensing matrixes based on the singular pseudo-symplectic space over finite fields

Compressed sensing (CS) provides a new approach to acquire data as a sampling technique and makes it sure that a sparse signal can be reconstructed from few measurements. The construction of compressed matrixes is a central problem in compressed sensing. This paper provides a construction of deterministic CS matrixes, which are also disjunct and inclusive matrixes, from singular pseudo-symplectic space over finite fields of characteristic 2. Our construction is superior to DeVore’s construction under some conditions and can be used to reconstruct sparse signals through an efficient algorithm.     

TD-LTE室内分布系统规划与组网方案

本文系统分析了频率应用和规划策略、单双路分布系统建设策略、分布系统共用策略、与其他系统干扰规避等TD-LTE室内覆盖组网方案所涉及的核心技术问题,随后基于组网方案研究阐述了TD-LTE室内分布系统的规划方法及规划原则,最后提出了现阶段TD-LTE室内分布系统建设策略.     

广义Turbo乘积码-GTPC及其应用

广义Turbo乘积码(GTPC)可以把不同的信源混合在一起以不同的方式编码。介绍一种多级GTPC的结构，该结构对于不同的信源，可根据各自的需求，选取不同的码型进行编码，然后组成GTPC数据帧。并提出一种在异步传输模式(ATM)应用多级GTPC的组帧方式，理论和仿真结果表明，该方式能在多业务混合编码的情况下提升通信系统的性能以及节省带宽。     

日本自卫队信息化建设的特点、体系结构及发展趋向

本文就日本自卫队信息化建设的主要特点、体系结构、列装情况,及发展趋向作一简要的剖析与评述。     

我国3G光传输网技术演进趋势

全业务时代的竞争格局,必然促使移动网络的IP化进程。我国3G牌照发放后,基站回传(Backhaul)光传输网建设已成为我国电信网建设的主要驱动力。本文首先分析了3G网络组成,具体分析了基站回传网络建设中采用多业务传输平台(MSTP)和分组传输网(PTN)的特点和发展趋势,论述了PTN必将发展为无线接入网(RAN)IP化的主流技术。     

Toward generating causal explanation: qualitative simulation withassociation mechanism to quantitative information

One of the central issues of qualitative reasoning is generating causal explanation in response to a user's query. The construction of an adequate model is crucial to the generation of a valid explanation in the case of large scale systems. This paper describes a new approach to the model construction based on using a causal ordering algorithm and qualitative conversion of numerical data. Our approach involves two key ideas: (1) a qualitative model is constructed from a unique quantitative model and (2) simulated qualitative behavior aspects are compared with numerical data. This approach is illustrated by using it to generate causal explanation related to the operation of a nuclear power plant