共軛梯度法為求解線性方程組而提出。后來，人們把這種方法用于求解無約束最優化問題， 使之成為一種重要的最優化方法。 共軛梯度法的基本思想是把共軛性與最速下降方法相結合， 利用已知點處的梯度構造一組共 軛方向， 并沿這組方向進行搜索， 求出目標函數的極小點。 根據共軛方向的基本性質， 這種 方法具有二次終止性。 在各種優化算法中， 共軛梯度法是非常重要的一種。 其優點是所需存 儲量小，具有步收斂性，穩定性高，而且不需要任何外來參數。 共軛方向 無約束最優化方法的核心問題是選擇搜索方向 . 在本次實驗中 , 我們運用基于共軛方向的一種 算法 — 共軛梯度法 三．算法流程圖： 四．實驗結果： (1). 實驗函數 f=(3*x1-cos(x2*x3)-1/2)^2+(x1^2-81*(x2+0.1)+sin(x3)+1.06)^2+(exp(-x1*x2)+20*x3+ 1/3*(10*3.14159-3))^2; 給定初始點 (0,0,0) ， k=1 ，最 大迭代次數 n ? ? d 確定搜索方向 進 退 法 確 定 搜 索 區 間 分割法確定最 優步長
上傳時間： 2016-05-08
上傳用戶：saren11
16qam 隨著現代通信技術的發展， 特別是移動通信技術高速發展， 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天， 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢， 成為寬帶無線接入和無線視頻通信的 重要技術方案。 隨著現代通信技術的發展， 特別是移動通信技術高速發展， 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天， 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢， 成為寬帶無線接入和無線視頻通信的 重要技術方案。
上傳時間： 2016-06-26
上傳用戶：guh000
Standard transfer specification (STS) –Physical Layer protocol for one-way numeric and magnetic card token carriers .
上傳時間： 2017-02-04
上傳用戶：aarons大叔
Introduction jSMPP is a java implementation (SMPP API) of the SMPP protocol (currently supports SMPP v3.4). It provides interfaces to communicate with a Message Center or an ESME (External Short Message Entity) and is able to handle traffic of 3000-5000 messages per second. jSMPP is not a high-level library. People looking for a quick way to get started with SMPP may be better of using an abstraction Layer such as the Apache Camel SMPP component: http://camel.apache.org/smpp.html Travis-CI status: History The project started on Google Code: http://code.google.com/p/jsmpp/ It was maintained by uudashr on Github until 2013. It is now a community project maintained at http://jsmpp.org Release procedure mvn deploy -DperformRelease=true -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ -DrepositoryId=sonatype-nexus-staging -Dgpg.passphrase=<yourpassphrase> log in here: https://oss.sonatype.org click the 'Staging Repositories' link select the repository and click close select the repository and click release License Copyright (C) 2007-2013, Nuruddin Ashr uudashr@gmail.com Copyright (C) 2012-2013, Denis Kostousov denis.kostousov@gmail.com Copyright (C) 2014, Daniel Pocock http://danielpocock.com Copyright (C) 2016, Pim Moerenhout pim.moerenhout@gmail.com This project is licensed under the Apache Software License 2.0.
上傳時間： 2019-01-25
上傳用戶：dragon_longer
pcie3.0標準規范 1. INTRODUCTION 2. TRANSACTION Layer SPECIFICATION 3. DATA LINK Layer SPECIFICATION 4. PHYSICAL Layer SPECIFICATION 5. POWER MANAGEMENT 6. SYSTEM ARCHITECTURE 7. SOFTWARE INITIALIZATION AND CONFIGURATION
標簽： pcie3
上傳時間： 2019-07-05
上傳用戶：bingshi
This introduction takes a visionary look at ideal cognitive radios (CRs) that inte- grate advanced software-defined radios (SDR) with CR techniques to arrive at radios that learn to help their user using computer vision, high-performance speech understanding, global positioning system (GPS) navigation, sophisticated adaptive networking, adaptive physical Layer radio waveforms, and a wide range of machine learning processes.
標簽： Technology Cognitive Radio
上傳時間： 2020-05-26
上傳用戶：shancjb
It is commonly accepted today that optical fiber communications have revolutionized telecommunications. Indeed, dramatic changes have been induced in the way we interact with our relatives, friends, and colleagues: we retrieve information, we entertain and educate ourselves, we buy and sell, we organize our activities, and so on, in a long list of activities. Optical fiber systems initially allowed for a significant curb in the cost of transmission and later on they sparked the process of a major rethinking regarding some, generation-old, telecommunication concepts like the (OSI)-Layer definition, the lack of cross-Layer dependency, the oversegmentation and overfragmentation of telecommunica- tions networks, and so on.
上傳時間： 2020-05-27
上傳用戶：shancjb
The writing of this book was prompted by two main developments in wireless communications in the past decade. First is the huge surge of research activities in physical-Layer wireless communication theory. While this has been a subject of study since the 60’s, recent developments in the field, such as opportunistic and multi-input multi-output (MIMO) communication techniques, have brought completely new per- spectives on how to communicate over wireless channels.
標簽： Communication Fundamentals Wireless of
上傳時間： 2020-05-27
上傳用戶：shancjb
Multi-carrier modulation? Orthogonal Frequency Division Multi- plexing (OFDM) particularly? has been successfully applied to a wide variety of digital communications applications over the past several years. Although OFDM has been chosen as the physical Layer standard for a diversity of important systems? the theory? algorithms? and implementation techniques remain subjects of current interest. This is clear from the high volume of papers appearing in technical journals and conferences.
標簽： COMMUNICATIONS MULTI-CARRIER DIGITAL
上傳時間： 2020-05-31
上傳用戶：shancjb
The investigation of the propagation channel is becoming more and more important in mod- ern wireless communication. The demand for spectral efficiency motivates exploitation of all channels that can possibly be used for communications. Nowadays, a common trend for designing physical Layer algorithms is to adapt the transceiving strategy, either by maximizing the diversity gains or by utilizing the coherence of the channels to improve the signal-to-noise power ratio.
標簽： Characterization Propagation Channel
上傳時間： 2020-05-31
上傳用戶：shancjb
