介紹了衛(wèi)星通信多址方式的特點(diǎn)和比較
上傳時(shí)間: 2013-11-07
上傳用戶:13686209316
研究基于IP 無線網(wǎng)絡(luò)中精細(xì)粒度可伸縮性( FGS) 視頻的傳輸。基于包交換的IP 無線網(wǎng)絡(luò)通常由兩段鏈路組成: 有線鏈路和無線鏈路。為了處理這種混合網(wǎng)絡(luò)中不同類型數(shù)據(jù)包的丟失情況, 對(duì)FGS 視頻增強(qiáng)層數(shù)據(jù)運(yùn)用了一個(gè)具有比特平面間不平等差錯(cuò)保護(hù)(BPUEP) 的多乘積碼前向糾錯(cuò)(MPFEC) 方案進(jìn)行信道編碼。對(duì)FGS 增強(qiáng)層每一個(gè)比特平面(BP) , 在傳輸層, 采用里德—索羅蒙碼(RS) 提供比特平面間的保護(hù); 而在鏈路層, 則運(yùn)用循環(huán)冗余校驗(yàn)碼(CRC) 串聯(lián)率兼容穿孔卷積碼(RCPC) 提供數(shù)據(jù)包內(nèi)保護(hù)。還提出了一個(gè)率失真優(yōu)化的信源—信道聯(lián)合編碼的碼率配置方案, 仿真結(jié)果顯示出該方案在提高接收端視頻質(zhì)量方面的優(yōu)勢(shì)。
標(biāo)簽: FGS 無線網(wǎng)絡(luò) 乘積碼 方案
上傳時(shí)間: 2013-11-14
上傳用戶:1234567890qqq
系統(tǒng)以AT89C2051為核心,基于DS18B20的單總線模式設(shè)計(jì)了一個(gè)多點(diǎn)環(huán)境溫度采集系統(tǒng),解決了傳統(tǒng)測(cè)溫系統(tǒng)的結(jié)構(gòu)復(fù)雜,功耗高,不適應(yīng)野外無人值守環(huán)境溫度檢測(cè)的問題。文章給出了各模塊的硬件電路,軟件設(shè)計(jì)流程以及程序編制中的注意事項(xiàng)。經(jīng)實(shí)驗(yàn),該系統(tǒng)工作穩(wěn)定可靠,功耗低,非常適合無人值守情況下的野外環(huán)境溫度檢測(cè)。
標(biāo)簽: 環(huán)境 多點(diǎn) 溫度 自動(dòng)
上傳時(shí)間: 2013-10-30
上傳用戶:truth12
CTP單層多點(diǎn)設(shè)計(jì)
上傳時(shí)間: 2013-11-15
上傳用戶:banyou
簡(jiǎn)單介紹了單層多點(diǎn)的實(shí)現(xiàn)
上傳時(shí)間: 2013-10-26
上傳用戶:Bert520
多功能智能溫室監(jiān)控系統(tǒng)設(shè)計(jì)
標(biāo)簽: 多功能 智能溫室 監(jiān)控 系統(tǒng)設(shè)計(jì)
上傳時(shí)間: 2013-11-04
上傳用戶:Altman
智能巡線小車的多模式速度控制系統(tǒng)
上傳時(shí)間: 2013-10-27
上傳用戶:253189838
聲源檢測(cè)與定位的多分辨處理的原理!
上傳時(shí)間: 2013-10-24
上傳用戶:yzy6007
基于紅外探測(cè)原理的多路無線安防系統(tǒng)設(shè)計(jì)
標(biāo)簽: 紅外探測(cè) 多路 無線安防 系統(tǒng)設(shè)計(jì)
上傳時(shí)間: 2013-11-15
上傳用戶:semi1981
多遠(yuǎn)程二極管溫度傳感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical devices allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
標(biāo)簽: Considerat Design 遠(yuǎn)程 二極管
上傳時(shí)間: 2014-12-21
上傳用戶:ljd123456
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