Once upon a time, cellular wireless networks provided two basic services: voice
telephony and low-rate text messaging. Users in the network were separated
by orthogonal multiple access schemes, and cells by generous frequency reuse
patterns [1]. Since then, the proliferation of wireless services, fierce competition,
andthe emergenceof new service classes such as wireless data and multimediahave
resulted in an ever increasing pressure on network operators to use resources in a
moreefficient manner.In the contextof wireless networks,two of the most common
resources are power and spectrum—and, due to regulations, these resources are
typically scarce. Hence, in contrast to wired networks, overprovisioning is not
feasible in wireless networks.
標(biāo)簽：
Maximization
Nonconvex
Wireless
Utility
Systems
in
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
The “bottom-line” metrics of cash flow, demand, price, and return on investment
are driven by a second set of financial metrics represented by value to the
customer, cost, and the pace of innovation. Get them right relative to competition
and impressive bottom-line results should follow. Because of their importance, we
call value to the customer, variable cost, and the pace of innovation the
“fundamental metrics.”
標(biāo)簽：
Planning
Product
Systems
Driven
Value
and
上傳時(shí)間：
2020-06-06
上傳用戶：shancjb
搶答器是一種智力競(jìng)賽常用的器件,搶答器的設(shè)計(jì)方法千差萬別,文章利用常用的數(shù)字電子器件,設(shè)計(jì)了八路搶答器電路的設(shè)計(jì)、仿真及實(shí)現(xiàn)的全過程,提出兩種可行的設(shè)計(jì)方案:方案1采用74ls373實(shí)現(xiàn)電路鎖存,74ls148實(shí)現(xiàn)電路編碼,74ls74及數(shù)碼管實(shí)現(xiàn)電路顯示;方案二采用CD4511BCN和LMC555CM集成電路及數(shù)碼管實(shí)現(xiàn)搶答器的控制和顯示。本文設(shè)計(jì)用的器件簡(jiǎn)單,容易理解,適用于初學(xué)電子技術(shù)的人員。Answer scrambler is a common device in intelligence competition, and its design methods vary greatly. This paper designs the whole process of design, simulation and Realization of the circuit of eight-way answer scrambler by using common digital electronic devices, and puts forward two feasible design schemes: scheme 1 uses 74 ls373 to realize circuit latching, 74 ls148 to realize circuit coding,74 ls74 and digital tube to realize circuit. The second scheme uses CD4511 BCN, LMC555 CM integrated circuit and digital tube to control and display the answerer. The device designed in this paper is simple and easy to understand, and it is suitable for the beginners of electronic technology.
標(biāo)簽：
搶答器
上傳時(shí)間：
2022-04-05
上傳用戶：
隨著科技的發(fā)展，人們?cè)谌粘Ｉ钪惺褂玫碾娖髟絹碓蕉啵娮釉O(shè)備的電磁兼容性（EMC）也越來越重要。所以，人們對(duì)電子設(shè)備的電磁兼容性的要求也越來越嚴(yán)格，越來越規(guī)范。而在市場(chǎng)競(jìng)爭(zhēng)中，如何降低成本、減少設(shè)備體積，是各電子設(shè)備制造廠家重點(diǎn)研究的課題。通過對(duì)開關(guān)電源的EMI濾波電路的類別和相應(yīng)的技術(shù)特點(diǎn)進(jìn)行分析，設(shè)計(jì)出一種既能提高性能，又能降低成本的濾波電路。With the development of technology, appliances people use in their daily lives, more and more electronic devices electromagnetic compatibility （ EMC ） has become increasingly important. So, people electromagnetic compatibility requirements of electronic devices have become increasingly stringent, more and more standardized. The competition in the market, how to reduce costs, reduce equipment size, is the subject of the electronic equipment manufacturer focused on research. Through the technical characteristics of the respective category and the EMI filter circuit switching power supply is analyzed both designed to improve a performance of the filter circuit can reduce the cost.
標(biāo)簽：
開關(guān)電源
濾波電路
上傳時(shí)間：
2022-04-23
上傳用戶：
