LDPC码在均衡技术中的应用

LDPC码的BP译码算法是一种迭代算法,译码复杂度低,可实行完全的并行操作.介绍BP译码算法,以及LDPC码与均衡技术结合的基本原理,并提出了一种基于MMSE均衡技术的线性LDPC均衡算法.     

法的形式要素与罪刑法定原则的法哲学思考

我国在刑法典中确认罪刑法定原则首先应该从法哲学中找理论根据。我们通过对法的形式要素以及罪刑法定原则理论渊源的分析，将法的形式合理性作为法哲学的一项原则加以提出，从而使罪刑法定原则的法哲学基础。     

利用回收站保密重要文件

通过分析WINDOWS9X中回收站的特性和回收站中两个重要文件 的格式。说明了WINDOWS9X中回收站的工作原理,提出一种利用回收站保密文 件的方法.     

级联Turbo-SPC码的空时系统的设计

Multiple antenna wireless systems can provide larger channel capacity and enable spatial diversity to combat fading. In this paper we conduct an investigation into the design of coded space-time system obtained by serially concatenating channel code module and space-time code module with an interleaver in between. As an example, the system is constructed by employing low decoding complexity turbo-SPC （single parity check） code as outer module and linear complex field space-time code as inner module, which achieves full diversity and lossless equivalent channel capacity. Simulation results prove that our designed system performs well and it only loses 0.8 dB from multiple-input multiple-output （MIMO） capacity at BER = 10^-5 in the case of information bit length 6048. Compared with turbo code-based systems, it also has lower error floor.     

高职学生毕业论文撰写要领

探讨了适合高职毕业论文类型的选择和各构成要素的写作要领,介绍了常用的学术论文写作规范,旨在帮助毕业生掌握科技论文的规范表达和科学研究的基本思路,提高论文的写作效率和质量。     

LDPC based differential unitary space-frequency coding for MIMO-OFDM systems

INTRODUCTION Unitary space-time modulation (USTM) (Hochwald and Marzetta, 2000) has been shown to be ideally suited for Rayleigh flat fading channels when there is no CSI. And for continuously changing fading channels, differential unitary space-time modulation (DUSTM) was proposed in Hochwald and Sweldens (2000). However, the performance of DUSTM de-grades considerably in frequency-selective fading channels often encountered in broadband wireless communications. Hence concatena…     

Decoding Reed-Solomon codes using Euclid’s algorithm

Reed-Solomon codes are indeed an elegant illustration of a very practical application of abstract algebra. An interesting discovery was the fact that Euclid’s algorithm for finding greatest common divisors of polynomials, could be used for decoding these codes. In this article we explain this connection. Priti Shankar is with the Department of Computer Science and Automation at the Indian Institute of Science, Bangalore. Her interests are in theoretical computer science and error correcting codes.     

报文分析与代码实现相结合的网络协议教学模式研究

如何理解抽象的网络协议原理是计算机网络协议课程教学中的难点。文章从提高学生实践能力的角度出发,分析了网络协议课程的地位和培养目标,给出了协议报文分析和代码实现相结合的网络协议教学模式,探讨了报文编辑、分析以及报文代码调试的过程和方法。该模式将抽象的概念变得具体可操作,在网络协议教学实践中取得了较好的效果。     

文津阁《四库全书》的庋藏

文津阁,清代皇家藏书楼,对珍藏和保存典籍发挥了重要作用,阐述文津阁庋藏《四库全书》的情况,引用史料,证明文津阁本《四库全书》的历史价值。     

Disengaged Ethics

Drawing upon scholars who call for an open and inclusive approach to journalism ethics, this paper examines empirically three recent efforts to develop or revise codes guiding journalistic practices. It explores the code developers’ intentions in their work and the values they embraced, finding widespread interest in serving the public and representing community interests. However, as new technologies and emphasis on participatory approaches have the power to reshape journalism, work on these ethical codes involved almost entirely closed processes exclusive to journalists and professional organizations. Such exclusivity calls into question the dedication to serve the public and encourage participation. It also squanders an opportunity to understand the interests of varying publics and how these might inform journalistic work, while simultaneously keeping the public from better views of journalistic practices, norms, and principles.