communications channel 中文意思是什麼

communications channel 解釋
通信波道
  • communications : 溝通
  • channel : n 1 水路，水道，渠，溝；海峽；河床，河底。2 （柱等的）槽，凹縫；【機械工程】槽鐵，凹形鐵。3 〈比...
  1. Digital speech technology has been widely used in many fields of communications in recent years, but it is just at beginning to use acoustical wave to implement underwater digital speech communications, which mainly results from the bandwidth - limited underwater acoustic communications channel and its high temporal and spatial variability

    目前，數字語音技術已廣泛應用於許多通信領域，但是在水下利用聲波進行數字語音通信卻是剛剛起步的新技術，這主要是由於水聲通道有限的通信帶寬及其時變、空變等特性所決定的。
  2. Paca - e stage 2 service description for personal communications service - enhanced priority access and channel assignment paca - e supplementary service

    個人通信服務階段2服務描述.增強優先訪問和通道分配
  3. Telecommunications - stage 1 service description for personal communications service - enhanced priority access and channel assignment paca - e - supplementary service

    電信.個人通信業務的第1階段服務描述.加強優先權路徑和通道分配.補充服務
  4. A voice or data communications channel currently in use

    目前使用的話音或數據通信通道。
  5. Convolutional coding is a coding scheme often employed in deep space communications and recently in digital wireless communications. it offers an alternative to block codes for transmission over a noisy channel

    卷積碼被運用於衛星通信和無線通信系統中，它提供了一種不同於分組碼的在噪聲通道下傳輸信息的一種編碼方案。
  6. There are many decoding schemes for convolutional code, such as sequence decoding algorithm, fano algorithm, viterbi algorithm. but in fact, what ' s used widely is viterbi decoding algorithm. the viterbi decoding algorithm, proposed in 1967 by viterbi, is a decoding process for convolutional codes in memory - less channel, which takes full advantage of convolutional codes. since viterbi algorithm is proposed, it has obtained rapid development whether in theoretics or in practice and been applied to all kinds of data transmission systems, especially to digital wireless communications and deep space communications

    卷積碼的譯碼演算法方案有很多，如序列譯碼演算法、 fano演算法、 viterbi演算法，但是真正大規模應用的還是viterbi演算法。 viterbi譯碼演算法是1967年viterbi提出的，它是一種對無記憶通道卷積碼進行譯碼的演算法。它充分發揮了卷積碼的特點，因而自viterbi演算法提出以來，無論在理論上還是在實踐上都得到了極其迅速的發展，並廣泛的應用於各種數據傳輸系統，特別是無線通信和衛星通信系統中。
  7. The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above

    但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。
  8. In packet based wireless video communications, when best band distribution, not only source distortion should be considered, but also channel distortion caused by channel errors. the existing macroblock - layer rate control schemes calculates quantization parameters of all macroblocks ( mb ) in a frame in a raster scan order, and then encodes the mbs in the same order. actually, the quantization distortion is heavily dependent upon the coding order of mbs

    在基於包的無線視頻傳輸中，最佳帶寬分配時，不僅要考慮信源編碼失真，也要考慮由於通道差錯引起的通道失真；已有的宏塊層碼率控制演算法以矩陣掃描的順序計算一幀中所有宏塊的量化參數，事實上量化失真與宏塊的編碼順序有很大關系，改變宏塊的編碼順序，使復雜的宏塊分配到更多的比特數，顯然能大大提高編碼效率。
  9. Development of communications software for ultrasonic open - channel flowmeter monitor system

    超聲波明渠流量計監控系統通信軟體的開發
  10. There must be a marine casualty happened every 4 days before 1984, the amount of marine casualty happened at this area corresponds to 1 / 7 amount of the whole changjiang " marine casualty, so mariners gave it a name as " mouth of tiger ". due to the specific geographical condition and the extremely representative vessel traffic management of changjiang yingongzhou channel section, many intelligent people began researching and practicing the vessel traffic management of this changjiang " s down - stream complicated channel section from 1980s, at dec 15th 1984 the authority at that time - changjiang yingongzhou channel section previously ; up to the last years of 1980s ministry management administration applied traffic control on changjiang yingongzhou channel section previously, up to the last years of 1980s ministry of communications assigned shanghai marine college, shanghai ship & shipping research institute and changjiang harbor superintendence administration to make feasibility demonstrate about modern vts of zhenjiang traffic control section ; in 1990 dasha radar station which is the first radar vts station with inner river was finished, groped a new way for applying modern radar traffic control of vessel traffic management ; in 1997 the vtms of changjiang " s down - stream from nanjing to liuhekou was completed with connecting net and came into operation formally, meanwhile the signals of dasha radar station were conveyed to vts center by light cable, and then united applying vessel traffic management upon the whole authorized area ; in jun 2001 jiangsu msa made changjiang yingongzhou channel section as the first experimental group of creating " civilized, safe, passable channel activity, updating dasha radar antenna and receive - transmitter building closed - circuit television monitor system, setting uo safety warning board, starting navigational route reformation, carrying out united construction

    1984以前這里平均每四天就發生一起海損事故，事故數占整個長江的1 7 ，被行船人稱為「老虎口」 。長江尹公洲航段緣其極為特殊的地理區位條件和極具代表性的船舶交通管理，從上個世紀八十年代初就有識之士開始了這個長江下游最復雜航段的船舶交通管理探索和實踐。 1984年11月15日當時的長江航政管理局在長江尹公洲水域率先施行交通管制；到八十年代末交通部委託上海海運學院、上海船舶研究所和長江港監局聯合開展鎮江交通管制段建立現代化交管系統的可行性論證； 1990年大沙雷達站? ?內河第一座雷達交管站建成，摸索實施現代化雷達交管的船舶交通管理新途徑； 1997年長江下游南京至瀏河口船舶交通管理系統建成聯網投入正式運行，同時將大沙交管雷達信號通過光纜傳輸至交管中心，統一實施全轄區船舶交通管理； 2001年6月江蘇海事局將長江尹公洲航段作為第一批創建「文明平安暢通航段」活動試點航段，更新大沙雷達天線和收發機，著手閉路工業電視監控系統建設，設立安全警示牌，啟動航路改革，開展聯合「共建」 。
  11. Because of the channel, hydrology and special of term weather in the yangtze river, shippingenterprises complexity, the yangtze river navigation safety management was very outstanding. the yangtze river navigation safety management has been paid. attention by the ministry of communications

    但是，由於長江航道、水文、氣象條件的特殊性，水運企業經濟成份的多樣性，以及安全管理的復雜性，長江水上安全問題也十分突出，長江干線的水上交通安全問題一直是交通部安全管理工作的重點。
  12. Wdm has promoted greatly the development of optical communications, optical net based on wdm technology will become the main transmitting flat roof in telecom net. in wdm, with increasing the channel density, a new kind of optical component, interleaver, emerges as the times require. in this paper, several main interleaving technologies are analyzed quite deeply, and mgti interleaver is investigated experimentally, one prototype device with better experiment results is achieved

    波分復用技術（ wdm ）對于光通信技術的發展起到了巨大的推動作用，以dwdm技術為核心的光傳送網將成為電信網的主要傳送平臺。在密集波分復用技術中，隨著通道復用密度的提高，一種新型光器件? ?光學梳狀濾波器（ interleaver ）應運而生。
  13. The ministry of communications has been proposed a " three main and one support " ( the main framework of highway, the main channel of water transport, the main hub of harbor station, and the supporting system of modern traffic ) long - term plan of construction of communications, then carrying out nationwide distribution plan of national arterial highway system and highway main hub system

    交通部提出了「三主一支持」的交通建設長遠規劃，並進行了全國國道主幹線系統和公路主樞紐系統的布局規劃。目前，各省交通廳在國家級公路主樞紐系統的總體框架下，分別進行了各省的二級公路樞紐系統的規劃。
  14. It is expensive to experiment on hired real satellite link in formulating satellite communications system and researching transceiver. satellite channel simulator can simulate transmission characteristics of electromagnetic wave close to real channel environment

    衛星通道模擬器能模擬接近真實通道環境的電波傳輸特性，用於設備研製過程中的測試，將會顯著降低研發成本。
  15. In addition to existing direct liaison channels with beijing, guangdong, zhuhai and shenzhen, the force established a new channel with shanghai in 2003, in which electronic communications will be employed

    警隊一直與北京、廣東、珠海及深圳設有直接聯絡渠道，並於年內與上海建立直接聯絡渠道，雙方日後會採用電腦系統互相聯系。
  16. The performances of various queueing models in the virtual channel connection of atm communications network are analyzed in the second part of this paper

    文中第二部分分析了atm通信網虛通道連接中不同排隊模型的性能。
  17. Using the internet as a communications channel, adoption of epc will allow product - specific information to be shared in real - time, from practically anywhere in the world

    藉著網際網路作為通訊渠道，用戶便可在世界各地即時取得配上了電子產品碼的產品的資料。
  18. What the xoops team learned from their mpn experience is that users want an easy to install, easy to use, feature complete system from the beginning and a clear open communications channel

    Xoops團隊從mpn的經驗中學到，使用者想要的是透過純開放交流的管道中獲得安裝簡單、使用簡便及功能齊全的系統。
  19. The emergence of dtmf signaling scheme solved much problems of transferring dialing information in the communication system, such as slow, suffering severe distortion, and required a dc path through the communications channel

    Dtmf信號的出現解決了以往通信系統中傳輸撥號信息的諸多問題，如速度慢、易受干擾、需要提供直流通路等。
  20. Topics covered include : statistical analysis of signal processing systems, including radiometers, spectrometers, interferometers, and digital correlation systems ; matched filters and ambiguity functions ; communications channel performance ; measurement of random electromagnetic fields, angular filtering properties of antennas, interferometers, and aperture synthesis systems ; and radiative transfer and parameter estimation

    主題包含了信號處理系統的統計分析；輻射儀、光譜儀、干涉儀及數位關聯系統；匹配濾波器、未定值函數；通信通道的效能；隨機電磁場之量測；天線的角度濾波特性；干涉儀與孔徑合成系統；輻射轉換與參數估計。
分享友人
分享到 Line

分享到臉書