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Search Results: 1 - 10 of 946 matches for " 宋国文 "
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RESEARCH OF THE DESIGN METHOD FOR ROTATIONALLY INVARIANT TRELLIS CODES WITH 2-D QAM
二维QAM旋转不变TCM设计方法的研究

Hu Jianming,Song Guowen,
胡建明
,宋国文

电子与信息学报 , 1993,
Abstract: Based on L. F. Wei's work (1984), the generalized trellis diagram oftrellis codes is defined, then the properties of rotationally invariant trellis codes with two-dimensional QAM constellations are discussed, and all the unequivalent signal assignments are given. Finally, rotationally invariant trellis codes are designed easily.
A METHOD OF IMAGE VECTOR QUANTIZATION CODING USING RECTANGULAR TRANSFORM
图象的矩形变换矢量量化编码法

Wang Kai,Song Guowen,
汪凯
,宋国文

电子与信息学报 , 1990,
Abstract: A simple and practical rectangular transform and the vector quantization technique are described. A method for image data compression by combining the rectangular transform with vector quantization technique is presented. By using this method, the dimension of vector coding and the size of the corresponding codebook are reduced; the vector encoding process is picked up; and also the coding rate is reduced. The results of simulation' show that this coding method is very effective in the field of image coding.
ON JUSTESENS ALGEBRAIC GEOMETRY CODES
关于Justesen代数几何码

Lu Peizhong,Song Guowen,
陆佩忠
,宋国文

电子与信息学报 , 1992,
Abstract: An isomorphism preserving Hamming weight between two algebraic geometry (AG) codes is presented to obtain the main parameters of Justesen's algebraic geometry (JAG) codes. To deduce a simple approach to the decoding algorithm, a code word in a "small" JAG code is used to correspond to error-locator polynomial. By this means, a simple decoding procedure and the ability of error correcting are explored obviously. The low and up bounds of the dimension of AG codes are also obtained.
Efficient Determination for Voronoi Cell of Vector Quantizers
矢量量化中Voronoi区域的有效确定

LU Peizhong,SONG Guowen,YI Li,
陆佩忠
,宋国文,伊里

系统工程理论与实践 , 1999,
Abstract: In order to deduce the complexities of both the realization and coding algorithm for a given quantizer, Gersho 1 suggested two algorithms for computing nonredundant and adjacent codes of a Voronoi cell. After analyzing, we find that these algorithms are not very satisfying because they are involved in integer programming or probabilistic trial. In this paper, we present a new efficient algorithm for the corresponding problem.
Performance Analysis of Coherent Delay-Locked Loop Based on Interpolation and Integrate/Dump Filter
基于内插与积分清除滤波的相干DLL性能分析

Li Ke-xiang,Song Guo-wen,
李科祥
,宋国文

电子与信息学报 , 2004,
Abstract: A Coherent Delay-Locked Loop(CDLL) is proposed based on interpolation and integrate/dump filter for PN code tracking in DS-CDMA systems. The performance of the CDLL is investigated under AWGN and multi-user environments, and closed-form expressions for the timing adjustment error probability, steady-state timing squared root error, probability and Mean Time to Lose Lock (MTLL) are derived by employing appropriate Markov chain models. Finally, sonic numerical results are presented and analysis shows that those results also perform well in single path fading environment. The delay-locked loop is applied to the development of WCDMA BTS and WCDMA MT.
SYNTHESIS OF MULTISEQUENCES AND THEIR APPLICATIONS
多个序列综合问题的新模型及其应用

Lu Peizhong,Song Guowen,Zhou Jinjun,
陆佩忠
,宋国文,周锦君

电子与信息学报 , 1993,
Abstract: A new mathematical model, the linear homogeneous equations with polynomial coefficients for describing the synthesis problem, is presented in this paper. It gives a nature approach ro generalize the linear synthesis to nonlinear case. This method is used ro obtain a new solution for the multisequence synthesis. The Grobner bases theory in polynomial ring is used to present an efficient algorithm for the mathematical model. This turns out to be a generalization of Euclid' algorithm. However, the new one has much brilliant prospects. As one of the important results, it is discovered that the new algorithm can be used to deduce an efficient decoding algorithm for a class of algebraic geometry codes constructed by Justesen, so the important open problem is solved.
cdma20001x前向功率分配分析
柴远波,罗兴国,季新生,宋国文,王月清
电子学报 , 2003,
Abstract: 本文提出了一种在多径传输约束条件及不同的移动台运动速度条件下对前向信道链路进行功率分配的方法,这是根据导频信道和业务信道之间各自信号强度的相关性合理地分配前向链路中的信道发射功率.通过实验测试及理论推导,本文给出了这种相关性曲线,从而发现了最佳的导频信道功率,它能够在满足1%FER时使总发射功率最小.
生态和谐的蕴义与愿景:政府、公民与社会的环境目标
The Connotation and Vision of Ecological Harmony: Government, Citizen and Society’s Environment Objectives
 [PDF]

国文, 刘玉珠
Advances in Social Sciences (ASS) , 2012, DOI: 10.12677/ASS.2012.13012
Abstract: 随着现代工业社会的单向度发展,生态问题日益突出并持续恶化。全球环境问题已经成为了众多政治问题的一个重要方面。实现生态和谐已成为政府、公民以及社会所共同追求的环境目标。本文从生态政治、生态公民以及生态社会三个维度出发讨论生态和谐,指出生态和谐是生态政治的终极目标,生态政治则是生态和谐的制度保证;生态和谐是生态公民的生活愿景,生态公民则是生态和谐的主体人群;生态和谐是生态社会的有机构成,生态社会则是生态和谐的环境依托。并进一步提出了要想实现生态和谐需要政治方面的政策引导、公民方面的行动支持以及社会方面的环境保障。
Along with the development of modern industrial society, ecological problems have become prominent increasingly and continued to be worsen than before. Global environmental problem is now an important aspect among numerous political issues. Realization of the ecological harmony has become the government, citizen and society’s common goal. This article will discuss the ecological harmony from three aspects as the political ecology, ecological citizenship and ecological society. It will further put forward to the policy guiding about realizing ecological harmony, approving in terms of action from civic and social envi-ronmental guarantee.
几类重要的免疫抗原糖脂分子研究进展有机化学
国文
有机化学 , 2007,
Abstract: 近些年来随着化学生物学的兴起,对糖脂类化合物,尤其是一些与免疫应答相关的糖脂分子的研究,取得了重大的进展,得到了一些很有意义的研究成果.着重就几类可作为免疫抗原的糖脂分子的研究进展以及它们的生物学功能进行综述.
紫花苜蓿田间越冬期抗寒生理研究
国文
草地学报 , 2009, DOI: 10.11733/j.issn.1007-0435.2009.02.003
Abstract: 为了解紫花苜蓿(MedicagosativaL.)在越冬期对低温的适应性,选取抗寒能力不同的5个紫花苜蓿品种,测定其在2003年秋末、深冬至2004年春季田间越冬期间根系的主要抗寒生理指标,结果表明各品种可溶性糖、游离脯氨酸和可溶性蛋白质含量均呈随着气温下降而增加、随着气温升高而减少的变化趋势,但积累量与抗寒能力相关性不显著;丙二醛(MDA)含量在秋末冬初随着气温的降低都有轻微下降,但随着寒冷的加剧,呈现急速增加,然后急速下降趋势;过氧化物酶(POD)活性都表现为随着秋末温度的下降而增加,随着寒冷的加剧而迅速下降,再随着翌年温度的回升而缓慢增加,过氧化物酶(POD)活力与品种抗寒力不呈正相关。
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