-
Use of multiple antennas at both ends of wireless links is the result of the
natural progression of more than four decades of evolution of adaptive
antenna technology. Recent advances have demonstrated that multiple-
input-multiple-output (MIMO) wireless systems can achieve impressive
increases in overall system performance.
標(biāo)簽：
Technology
System
MIMO
上傳時間：
2020-05-28
上傳用戶：shancjb
-
By definition, the term “mobile-radio communications” describes any
radio communication link between two terminals of which one or both
are in motion or halted at unspecified locations and of which one may
actually be a fixed terminal such as a base station. This definition
applies to both mobile-to-mobile and mobile-to-fixed radio communica-
tion links. The mobile-to-mobile link could in fact consist of a mobile-
to-fixed-to-mobile radio communication link.The term “mobile” applies
to land vehicles, ships at sea, aircraft, and communications satellites.
In tactical situations, mobile-radio systems may include any or all of
these types of mobile terminals.
標(biāo)簽：
Communications
Engineering
Mobile
上傳時間：
2020-05-30
上傳用戶：shancjb
-
Advances in communication and networking technologies are rapidly making ubiq-
uitous network connectivity a reality. Wireless networks are indispensable for
supporting such access anywhere and at any time. Among various types of wire-
less networks, multihop wireless networks (MWNs) have been attracting increasing
attention for decades due to its broad civilian and military applications. Basically,
a MWN is a network of nodes connected by wireless communication links. Due
to the limited transmission range of the radio, many pairs of nodes in MWNs may
not be able to communicate directly, hence they need other intermediate nodes to
forward packets for them. Routing in such networks is an important issue and it
poses great challenges.
標(biāo)簽：
Multihop
Wireless
Networks
上傳時間：
2020-05-31
上傳用戶：shancjb
-
Optical wireless communication is an emerging and dynamic research and development
area that has generated a vast number of interesting solutions to very complicated
communication challenges. For example, high data rate, high capacity and minimum
interference links for short-range communication for inter-building communication,
computer-to-computer communication, or sensor networks. At the opposite extreme is
a long-range link in the order of millions of kilometers in the new mission to Mars
and other solar system planets.
標(biāo)簽：
Communication
Wireless
Optical
Systems
上傳時間：
2020-05-31
上傳用戶：shancjb
-
Wireless means different things to different people. For this book, it refers
to the radio systems that provide point-to-point, point-to-multipoint, and
Earth-space communications over transmission links that propagate outside
buildings through the lower atmosphere. Wireless systems are being built
that provide data transmission between computers and other devices on
one’s own desk. These are part of the wireless world but not the part where,
except for interference perhaps, the atmosphere has any influence. The intent
of this book is to provide a description of the physical phenomena that can
affect propagation through the atmosphere, present sample measurements
and statistics, and provide models that system designers can use to calculate
their link budgets and estimate the limitations the atmosphere may place on
their design.
標(biāo)簽：
Communication
Propagation
Handbook
Wireless
for
上傳時間：
2020-05-31
上傳用戶：shancjb
-
A wireless communication network can be viewed as a collection of nodes, located in some domain, which
can in turn be transmitters or receivers (depending on the network considered, nodes may be mobile users,
base stations in a cellular network, access points of a WiFi mesh etc.). At a given time, several nodes
transmit simultaneously, each toward its own receiver. Each transmitter–receiver pair requires its own
wireless link. The signal received from the link transmitter may be jammed by the signals received from
the other transmitters. Even in the simplest model where the signal power radiated from a point decays in
an isotropic way with Euclidean distance, the geometry of the locations of the nodes plays a key role since
it determines the signal to interference and noise ratio (SINR) at each receiver and hence the possibility of
establishing simultaneously this collection of links at a given bit rate. The interference seen by a receiver is
the sum of the signal powers received from all transmitters, except its own transmitter.
標(biāo)簽：
Stochastic
Geometry
Networks
Wireless
Volume
and
II
上傳時間：
2020-06-01
上傳用戶：shancjb
-
A mobile ad-hoc network (MANET) is formed by multiple moving nodes
equipped with wireless transceivers. The mobile nodes communicate with
each other through multi-hop wireless links, where every node can transmit
and receive information. Mobile ad-hoc networks have become increasingly
important in areas where deployment of communications infrastructure is
difficult.
標(biāo)簽：
Telecommunications
Modeling
上傳時間：
2020-06-01
上傳用戶：shancjb
-
Having dealt with in-depth analysis of SS#7, GSM and GPRS networks I started to monitor
UTRAN interfaces approximately four years ago. Monitoring interfaces means decoding
the data captured on the links and analysing how the different data segments and messages
are related to each other. In general I wanted to trace all messages belonging to a single
call to prove if the network elements and protocol entities involved worked fine or if there
had been failures or if any kind of suspicious events had influenced the normal call
proceeding or the call’s quality of service. Cases showing normal network behaviour have
been documented in Kreher and Ruedebusch (UMTS Signaling. John Wiley & Sons, Ltd,
2005), which provides examples for technical experts investigating call flows and network
procedures.
標(biāo)簽：
Performance
Measurement
Practical
Guide
UMTS
上傳時間：
2020-06-01
上傳用戶：shancjb
-
首先下載軟件，解壓軟件，安裝在程序中找到SEGGER,選里面的J-FLASH，進(jìn)入界面，剛開始的那個界面可以忽略，不用建project也可以；單擊菜單欄的“Options---Project settings”打開設(shè)置，進(jìn)行jlink配置;正在General選項，選擇“USB”，一般都是默認(rèn)配置，確認(rèn)一下即可;然后在CPU選項，選擇芯片型號，先選擇“Device”才能選擇芯片型號，芯片型號，要根據(jù)你使用的芯片進(jìn)行選擇;在Target interface選項 里面選擇SWD模式;首先Target里面選“Connection”連接目標(biāo)芯片，然后 Target--Auto進(jìn)行程序燒寫;首先Target里面選擇“Connection”連接目標(biāo)芯片，然后 Target--Auto進(jìn)行程序燒寫.SEGGER J-links are the most widely used line of debug probes available today. They've proven their value for more than 10 years in embedded development. This popularity stems from the unparalleled performance, extensive feature set, large number of supported CPUs, and compatibility with all popular development environments.
標(biāo)簽：
JLINK
上傳時間：
2022-03-22
上傳用戶：
-
AD17是一款十分出色的專業(yè)化PCB電路設(shè)計工具，Altium Designer 2017功能強(qiáng)勁，為用戶提供了全新的PCB布線及增強(qiáng)技術(shù)、動態(tài)鋪銅、自動交叉搜索等功能，AD17操作簡便，能夠幫助用戶輕松地將自己從干擾設(shè)計工作的瑣碎任務(wù)中解放出來，從而完全專注于設(shè)計本身。AD17軟件介紹 AD17是一款簡單易用、原生3D設(shè)計增強(qiáng)的一體化設(shè)計環(huán)境，它結(jié)合了原理圖、ECAD庫、規(guī)則和限制條件、BoM、供應(yīng)鏈管理、ECO流程和世界一流的PCB設(shè)計工具。從概念到完成產(chǎn)品，您的設(shè)計過程可以分解為若干個不同的階段，這些階段需要保持一致性和連接性。利用Altium Designer強(qiáng)大的工具，您可以完全掌控設(shè)計過程，提高了整個設(shè)計團(tuán)隊的生產(chǎn)力和工作效率，為您節(jié)省總體成本、縮短產(chǎn)品上市時間，助您一直處于新科技的最前沿。AD17軟件特點(diǎn) 1、輕松的設(shè)計自動化 1)超級強(qiáng)大的布線技術(shù)幫助您充分發(fā)揮設(shè)計潛力 從復(fù)雜的電路板布局到創(chuàng)新的可穿戴技術(shù)，altium designer 17可以非常很容易地設(shè)計出有效無誤的PCB板。憑借強(qiáng)大的布線技術(shù)，包括交互式布線模式和智能自動完成助手，您可以完全掌控PCB設(shè)計。 2)領(lǐng)先一步開始下一個設(shè)計工程 今天的設(shè)計是建立在過去成功的設(shè)計基礎(chǔ)之上的。通過altium designer 17中最高效的設(shè)計復(fù)用工具，幫助您發(fā)掘真正的設(shè)計潛力。輕松保存、共享和復(fù)用一切最值得信賴的設(shè)計資產(chǎn)，包括設(shè)計片段、受管的原理圖圖紙、公司的元器件庫和模板等。 3)輕松完成您的設(shè)計之旅 從概念到完成產(chǎn)品，您的設(shè)計過程可以分解為若干個不同的階段，這些階段需要保持一致性和連接性。利用altium designer 17強(qiáng)大的發(fā)布管理工具，您可以完全掌控設(shè)計過程。利用靈活的輸出文檔管理工具，您可以即時向制造商傳達(dá)完整的設(shè)計意圖。 2、直觀的團(tuán)隊協(xié)作 1)創(chuàng)造未來的柔性設(shè)計技術(shù) 要想在瞬息萬變的電子設(shè)計領(lǐng)域中生存下去，您需要一直站在變化的最前沿，來保持設(shè)計競爭力。通過業(yè)界第一款也是唯一一款支持剛?cè)峤Y(jié)合PCB設(shè)計的Altium Designer工具，設(shè)計當(dāng)前最具創(chuàng)新性的產(chǎn)品。輕松地定義材料選擇，智能地完成剛?cè)峤Y(jié)合板的布局和布線，在美觀的、原生3D PCB中展現(xiàn)您的工程藝術(shù)作品。 2)規(guī)范并集中管理您最有價值的設(shè)計資產(chǎn) 設(shè)計過程的成功取決于所使用元器件的數(shù)據(jù)完整性、可靠性和一致性。通過Altium Designer的集中元器件庫管理功能 ，可以建立一個來源唯一的、可信賴的、由整個設(shè)計團(tuán)隊共享的元器件庫。您可以在未來所有的項目中，立刻使用、管控和復(fù)用所有有價值的元器件。 3)在機(jī)械世界可視化和驗證您的電子設(shè)計 任何電子設(shè)計產(chǎn)品都要安裝在機(jī)械物理實體之中。通過altium designer 17的原生3D可視化與間距檢查功能，確保電路板在第一次安裝時即可與外殼完美匹配，不再需要昂貴的設(shè)計返工。在3D編輯狀態(tài)下，電路板與外殼的匹配情況可以實時展現(xiàn)，您可以在幾秒鐘內(nèi)解決電路板與外殼之間的 3、廣闊的工程應(yīng)用范圍 1)將您的設(shè)計與動態(tài)、智能的數(shù)據(jù)相連 最佳的元器件是，需要的時候就能夠買到，并且價格還符合您的預(yù)算要求。使用altium designer 17的Supplier links功能，可以從信賴的供應(yīng)商那里獲得豐富的元器件實時定價和可用性數(shù)據(jù)。即時獲得常用元器件的價格和庫存信息，您不再會因為買不到元器件而推遲產(chǎn)品發(fā)布日期了。 2)掌控設(shè)計數(shù)據(jù)和工作流程的效率 設(shè)計過程的成功取決于一系列單獨(dú)但密切相關(guān)的細(xì)節(jié)。通過altium designer 17強(qiáng)大的數(shù)據(jù)管理工具，掌控您的設(shè)計數(shù)據(jù)和工作流程。使用靈活的生命周期管理系統(tǒng)，可以精確地控制設(shè)計數(shù)據(jù);使用強(qiáng)大的版本控制系統(tǒng)，可以跟蹤每一個設(shè)計變更。 3)發(fā)掘?qū)I(yè)創(chuàng)建設(shè)計內(nèi)容的潛力 無需從頭開始進(jìn)行所有的PCB設(shè)計，您可以直接利用Altium建庫專家們的知識和經(jīng)驗。訪問Altium公司提供的超過300000個免費(fèi)元器件，提高元器件的創(chuàng)建效率。充分利用Altium專業(yè)制作專業(yè)管理的統(tǒng)一元器件庫內(nèi)容，節(jié)省創(chuàng)建和管理元器件庫的時間。
標(biāo)簽：
Altium Designer軟件下載
上傳時間：
2022-07-22
上傳用戶：canderile
