检索结果-内蒙古大学图书馆

您好，读者！请登录

内蒙古大学图书馆

首页
概况
党建
资源
服务
科研支持
- 论文收录引用证明
- 科技查新
知识产权
档案馆
帮助

咨询与建议

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

您的常用邮箱：*

您的手机号码：*

问题描述：

当前已输入0个字，您还可以输入200个字

全部搜索
期刊论文
图书
学位论文
标准
纸本馆藏
外文资源发现
数据库导航
超星发现

高级检索

时间限定

出版年份：

文献类型

图书期刊文献学位论文多媒体

馆藏选择

电子馆藏纸本馆藏

核心期刊

全部期刊 SCI 收录期刊 SSCI 收录期刊 EI 收录期刊 CSCD 收录期刊 CSSCI 收录期刊

语言

中文英文

文献类型

期刊文献图书学位论文标准纸本馆藏

帮助

文字说明：

T=题名（书名、题名），A=作者（责任者），K=主题词，P=出版物名称，PU=出版社名称，O=机构（作者单位、学位授予单位、专利申请人），L=中图分类号，C=学科分类号，U=全部字段，Y=年（出版发行年、学位年度、标准发布年）

检索规则说明：

AND代表“并且”；OR代表“或者”；NOT代表“不包含”；(注意必须大写,运算符两边需空一格)

检索范例：

范例一：(K=图书馆学 OR K=情报学) AND A=范并思 AND Y=1982-2016
范例二：P=计算机应用与软件 AND (U=C++ OR U=Basic) NOT K=Visual AND Y=2011-2016

分类表

所选分类

>> <<

限定检索结果

文献类型

6,096 篇 会议
928 篇 期刊文献

馆藏范围

7,024 篇 电子文献
0 种 纸本馆藏

日期分布

学科分类号

1,560 篇 工学
- 1,014 篇 电气工程
- 750 篇 信息与通信工程
- 247 篇 电子科学与技术（可...
- 193 篇 计算机科学与技术...
- 153 篇 仪器科学与技术
- 81 篇 交通运输工程
- 79 篇 机械工程
- 57 篇 控制科学与工程
- 43 篇 光学工程
- 42 篇 航空宇航科学与技...
- 18 篇 软件工程
- 18 篇 网络空间安全
- 6 篇 生物医学工程（可授...
- 4 篇 材料科学与工程（可...
- 4 篇 动力工程及工程热...
- 4 篇 土木工程
- 4 篇 船舶与海洋工程
- 4 篇 核科学与技术
- 3 篇 化学工程与技术
228 篇 理学
- 150 篇 物理学
- 46 篇 数学
- 24 篇 系统科学
- 3 篇 海洋科学
- 3 篇 统计学（可授理学、...
80 篇 文学
- 80 篇 新闻传播学
63 篇 管理学
- 60 篇 管理科学与工程(可...
- 3 篇 图书情报与档案管...
19 篇 医学
- 19 篇 临床医学
6 篇 军事学
- 6 篇 军队指挥学
3 篇 教育学
- 3 篇 教育学

主题

7,024 篇 modulation codin...
1,439 篇 fading
1,140 篇 decoding
1,032 篇 bandwidth
866 篇 bit error rate
832 篇 convolutional co...
760 篇 pulse modulation
710 篇 multiaccess comm...
668 篇 throughput
542 篇 signal to noise ...
542 篇 iterative decodi...
505 篇 phase modulation
497 篇 transmitting ant...
468 篇 ofdm modulation
444 篇 performance anal...
438 篇 frequency
435 篇 transmitters
429 篇 error correction...
418 篇 awgn
406 篇 interleaved code...

机构

37 篇 school of ecs un...
32 篇 department of el...
25 篇 jet propulsion l...
23 篇 institute for in...
23 篇 school of electr...
23 篇 department of el...
21 篇 department of el...
20 篇 department of el...
20 篇 department of el...
19 篇 department of el...
19 篇 philips research...
19 篇 department of el...
19 篇 department of el...
19 篇 school of inform...
18 篇 school of electr...
17 篇 department of ec...
15 篇 department of el...
15 篇 department of el...
14 篇 school of engine...
14 篇 qualcomm inc.orp...

作者

68 篇 l. hanzo
25 篇 s.x. ng
22 篇 e. biglieri
21 篇 d. divsalar
21 篇 xiang-gen xia
20 篇 dongfeng yuan
19 篇 t. ohtsuki
18 篇 m. sawahashi
18 篇 m.p. fitz
17 篇 i. sasase
17 篇 r. schober
17 篇 j.b. anderson
16 篇 j.m. cioffi
14 篇 s. x. ng
13 篇 g. caire
13 篇 dong-feng yuan
13 篇 a. ghosh
13 篇 xin wang
13 篇 lajos hanzo
12 篇 a. yongacoglu

语言

6,863 篇 英文
104 篇 其他
56 篇 中文
1 篇 俄文

检索条件"主题词=Modulation coding"

共 7024 条记录，以下是961-970 订阅

全选清除本页清除全部题录导出标记到"检索档案"

详细简洁

排序：

Shared power allocation among subcarriers of OFDM systems

Shared power allocation among subcarriers of OFDM systems

引用

International Conference on Emerging Trends in Electronic and Photonic Devices & Systems (ELECTRO)

作者： Vidya Kant Dwivedi Shivesh Tripathi Vijay Shanker Tripathi Rajeev Tripathi Sudarshan Tiwari Electronics and Communication Engineering Department MNNIT Allahabad India

ISBN: (纸本)9781424448463

Orthogonal frequency division multiplexing (OFDM) has several properties which make it an attractive modulation scheme for high speed wireless transmission links. In this paper, a novel power sharing technique is proposed for different users to improve the system performance. The proposed technique is based on use of variable amplitude of subcarriers (VAS). Power can be increased to the users who are crossing the reference boundary (RB) and moving farther towards foot print (FP) of a cell. In this way the users having weak SNR can sustain their call even in multipath fading environment. Assuming knowledge of the instantaneous channel gain estimation for all users, we propose an OFDM dynamic adaptive subcarriers scheme to maintain optimum SNR level of the subchannels which are in deep fade. Simulation results show that the performance of the proposed algorithm is much better than that of other algorithms.

关键词： Fading OFDM modulation Intersymbol interference System performance Foot Base stations modulation coding Power system modeling Power engineering and energy Optical modulation

来源：评论

学校读者我要写书评

暂无评论

A new technique to evaluate an expurgated bound on punctured turbo trellis coded modulation

A new technique to evaluate an expurgated bound on punctured...

引用

SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Luiz G. Caldeira Aline F. G. de Souza Cecilio Pimentel Humberto C. C. Fernandes Department of Electrical Engineering Science and Technology Federal Institute of Education Joao Pessoa Brazil Department of Electrical Engineering Federal University of Rio Grande do Norte Natal Brazil Department of Electronics and Systems Federal University of Pernambuco (UFPE) Recife Brazil

ISBN: (纸本)9781424453566;9781424453573

This work presents an enumerative technique to evaluate the distance spectrum of punctured turbo trellis coded modulation (TuCM) composed of two trellis coded modulation (TCM) component encoders connected in parallel via an interleaver. A matrix-based transfer function approach is employed to find the multiplicities of Hamming and Euclidean distances of input and output strings (distance spectrum) of each component TCM encoders after puncturing. An expurgated union bound on the bit error rate of TuCM schemes over the AWGN channel is computed using the distance spectrum. Comparisons with simulation results shows that the bound is tight in the range of the signal to noise of interest.

关键词： modulation coding

来源：评论

学校读者我要写书评

暂无评论

Log-likelihood ratio clipping in MIMO-BICM systems: Information geometric analysis and impact on system capacity

Log-likelihood ratio clipping in MIMO-BICM systems: Informat...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Stefan Schwandter Peter Fertl Clemens Novak Gerald Matz Institute of Communications and Radio-Frequency Engineering University of Technology Vienna Vienna Austria

The clipping of log-likelihood ratios (LLRs) in soft demodulators for multiple-input multiple-output (MIMO) systems with bit-interleaved coded modulation (BICM) was recently observed to allow for enormous complexity savings. In this paper we first provide an information-geometric interpretation of LLR clipping as information projection onto a log-convex manifold. Then we study the system capacity of MIMO-BICM systems that use LLR clipping. Our results show that strong LLR clipping is possible without significant capacity loss. We finally propose an LLR transformation scheme which is necessary for approaching capacity in case of strong clipping. The usefulness of this LLR transformation is illustrated by numerical simulations for MIMO-BICM systems employing low-density parity check (LDPC) codes.

关键词： Information analysis Decoding MIMO Parity check codes Demodulation modulation coding Numerical simulation Information geometry Symmetric matrices Radio frequency

来源：评论

学校读者我要写书评

暂无评论

Code phase and delay settings that minimize CDMA interference

Code phase and delay settings that minimize CDMA interferenc...

引用

IEEE Conference on Aerospace

作者： Richard S. Orr SATEL LLC Rockville MD USA

When code-division multiple access (CDMA) signals are linearly multiplexed (phase-coherently summed) at a transmit terminal, a receiver demodulating information from one component signal experiences multiple access interference (MAI) from all others to the extent that the waveforms are not strictly orthogonal. Under a model for which: (1) the users are homogeneous, i.e., identical in those parameters that govern the amount of MAI they produce at a receiver, and (2) the various codes are random binary sequences, one may develop an expression for the amount of induced MAI as a function of the spread-spectrum chip delays and phases. It is not immediately obvious from this expression, however, what selection of delays and phases produces the most benign distribution of MAI among users. This paper presents an analytic characterization of MAI for linear multiplexing of a set of CDMA codes, culminating in a deterministic design of delays and phases that achieves MAI noise levels substantially smaller than those predicted by worst-case or random assignment results. It is believed that the design achieves the minimum MAI level, although it is not proved.

关键词： Multiaccess communication Multiple access interference RF signals modulation coding Radiofrequency amplifiers Power amplifiers Gaussian noise Propagation delay Road transportation Binary sequences

来源：评论

学校读者我要写书评

暂无评论

Efficient weakly-constrained codes for mitigation of patterning effects in Digital Communications

Efficient weakly-constrained codes for mitigation of pattern...

引用

International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Alexander Shafarenko Michael Fedoruk Anton Skidin Sergei K. Turitsyn Department of Computer Science University of Hertfordshire Hatfield UK Institute of Computational Technologies SB RAS Novosibirsk Russia Aston University Birmingham Birmingham GB

We propose specific modulation block codes for weakly-constrained coding and demonstrate that their performance is close to the theoretical limit. We also show that when such codes are used for the mitigation of patterning effects in optical fibre communications, a gain of about 1 dB is possible under realistic conditions, if only at the expense of small redundancy (¿ 10%).

关键词： Digital communication Bit error rate Intersymbol interference Forward error correction modulation coding Optical fiber communication Frequency Block codes Information theory Degradation

来源：评论

学校读者我要写书评

暂无评论

Soft iterative channel estimator for BICM-ID-SSD over time-varying flat fading channels

Soft iterative channel estimator for BICM-ID-SSD over time-v...

引用

Wireless Telecommunications Symposium, WTS

作者： Zohreh Andalibi Ha H. Nguyen J. Eric Salt Department of Electrical and Computer Engineering University of Saskatchewan Saskatoon Canada

This paper proposes an iterative estimator for bit interleaved coded modulation (BICM) with an iterative soft-input soft-output (SISO) receiver over time-varying flat fading channels. More specifically, the system implements signal space diversity (SSD) where the QAM symbols are rotated. The use of an iterative Kalman filter shows good results using superimposed training sequence and Gauss-Markov channel model for fast tracking of the channel variation. The proposed soft iterative estimator uses the soft extrinsic information from the decoder as well as the superimposed training sequence to update the channel coefficients for data detection. To analyze the results, an analytical bound for the asymptotic bit error rate (BER) for BICM-ID-SSD over correlated fading channels is computed with perfect channel state information (CSI).

关键词： Fading Iterative decoding Time-varying channels Information analysis Bit error rate Channel estimation Random variables Transmitters Interleaved codes modulation coding

来源：评论

学校读者我要写书评

暂无评论

Efficient Soft-Output Demodulators for the Golden Code

Efficient Soft-Output Demodulators for the Golden Code

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Narayan Prasad Meilong Jiang Xiaodong Wang NEC Laboratories of America Inc. Princeton NJ USA Electrical Engineering Department Columbia University New York NY USA

In this work we design efficient soft output demodulators (also referred to as fast soft demodulators) for the 2 × 2 Golden code, which is a promising candidate space time block code in the evolving IEEE and 3GPP cellular standards. For this code, the naive approach for maximum likelihood (ML) hard decision as well as soft-output demodulation entails a complexity of O(M 4 ), where M denotes the cardinality of the QAM constellation from which the underlying modulated symbols are drawn. In contrast, our efficient demodulator exploits the structure of the code and yields the ML decision and soft outputs in the form of exact max-log log-likelihood ratios (LLRs) with an O(M 2.5 ) complexity. Moreover, we also design a sub-optimal soft output demodulator that has an O(M 0.5 ) complexity comparable to that of the linear minimum mean square error (LMMSE) based demodulator but results in substantial performance gains.

关键词： Demodulation MIMO Maximum likelihood decoding Code standards Quadrature amplitude modulation Transmitting antennas Block codes modulation coding Performance gain Space technology

来源：评论

学校读者我要写书评

暂无评论

On the time-frequency localization of the wavelet signals, with application to orthogonal modulations

On the time-frequency localization of the wavelet signals, w...

引用

International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Marius Oltean Alexandru Isar Communications Department Faculty of Electronics and Telecommunications Timisoara Romania

Orthogonal modulations are powerful techniques for digital data transmission, very well suited to radio channels. They use orthogonal basis, whose elements will be the ldquosubcarriersrdquo used in transmission. Some advantages of the wavelet functions compared to the windowed complex exponentials used in orthogonal frequency division multiplexing (OFDM) are highlighted. Thus, theoretical proof that Daubechies wavelets have better time-frequency localization is provided, opening new paths towards modern orthogonal modulation approaches, based on wavelets.

关键词： Time frequency analysis OFDM modulation Data communication Signal processing modulation coding AWGN Demodulation Digital modulation Distortion Propagation delay

来源：评论

学校读者我要写书评

暂无评论

A pseudo alamouti transceiver design for OFDM/OQAM modulation with cyclic prefix

A pseudo alamouti transceiver design for OFDM/OQAM modulatio...

引用

IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： Hao Lin Chrislin Lele Pierre Siohan France Telecom Orange Laboratories Cesson-Sevigne France

Multi-carrier modulation (MCM) and especially orthogonal frequency division multiplexing (OFDM) are currently used in many radio transmission standards. Among these modulations, OFDM offset QAM (OFDM/OQAM) is an interesting alternative to OFDM. However, differently to OFDM, OFDM/OQAM modulation cannot directly use Alamouti coding scheme due to the remaining interference. In this paper, we propose a scheme which permits to adapt OFDM/OQAM to multiple-input multiple-output (MIMO) Alamouti system. The simulation results illustrate its efficiency.

关键词： Transceivers OFDM modulation MIMO Receiving antennas Transmitting antennas Hydrogen modulation coding Interference US Department of Transportation Pulse modulation

来源：评论

学校读者我要写书评

暂无评论

A compact bi-directional power-conversion system scheme with extended soft-switching range

A compact bi-directional power-conversion system scheme with...

引用

IEEE Electric Ship Technologies Symposium, ESTS

作者： Liang Jia Sudip K. Mazumder Laboratory of Energy and Switching-Electronics Systems Department of Electrical and Computer Engineering University of Illinois Chicago USA

This paper outlines a soft-switching modulation scheme based on zero-current-switching (ZCS) principle with extended range for the front-end isolated dc/dc converter of an isolated three-phase rectifier-type high-frequency-link (RHFL) power converter. General modulation methodology and optimization conditions are presented, and with the help of linear programming, the optimum solution for a particular objective function can be achieved to implement the proposed ZCS scheme. In conjunction with a back-end ac/ac converter operating with a novel patent-filed hybrid modulation scheme which reduces the number of hard-switched commutation per switching cycle, the proposed ZCS scheme can also realize zero-voltage-switching (ZVS) on secondary side rectifier to improve the overall efficiency further. With the nonzero pulsating dc output, the proposed ZCS scheme is effective even without an active clamp circuit, and it is suitable for applications where low-voltage dc to high-voltage three-phase ac power conversion is required.

关键词： Bidirectional control Zero current switching DC-DC power converters modulation coding Optimization methods Linear programming Switching converters Zero voltage switching Rectifiers Clamps

来源：评论

学校读者我要写书评

暂无评论

没有更多数据了...

全选清除本页清除全部题录导出标记到“检索档案”

共500页 << < 93 94 95 96 97 98 99 100 101 102 > >>

检索报告对象比较合并检索0

隐藏清空

合并搜索

回到顶部

执行限定条件

内容：

评分：

请选择保存的检索档案：

请选择收藏分类：

订阅名称：

通借通还

温馨提示：

图书名称：

借书校区：

取书校区：

手机号码：

邮箱地址：

一卡通帐号：

电话和邮箱必须正确填写，我们会与您联系确认。

联系人：

所在院系：

联系邮箱：

联系电话：

内蒙古自治区呼和浩特市赛罕区大学西街235号邮编: 010021

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：