multiple data channel 中文意思是什麼
multiple data channel
解釋
多數據通道，多數據通道-
( 3 ) because of the limit of network bandwidth and data - packet capacity, the multiple channel transfer is evitable
（ 3 ）受網路帶寬和數據包容量的限制，多通道傳輸是不可避免的。 -
Gprs is packet - switched which means that multiple users share the same transmission channel, only transmitting when they have data to send
整合封包無線電服務是小包-轉變了當他們有數據送的時候，多個使用者分享相同的傳輸頻道，唯一的傳輸哪一個方法。 -
Multiple network transmissions overlapping in the physical channel, resulting in garbled data and necessitating retransmission
多個網路傳輸重迭發生在同一物理通道上，它導致數據被破壞，因而必須重傳。 -
This master degree thesis, based on the observing of developing actuality of on - site electrical apparatus monitoring technology, aims at overcoming the problems existing in former on - site monitoring system, such as unable to realize multiple channels sampling and hold, unable to carry out multiple channel programmable magnification, unable to monitor frequency, low pick up bits, external rom low speed data saving, inefficient data query method, inflexible debugging and installation, low precision etc. by introducing eda ( electrical design automation ) technology, we put forward a creative circuit design scheme, which can considerable updated the on - site monitor system
本文根據電氣設備絕緣在線監測技術的發展現狀，針對以往在線監測數據採集系統存在的集成度低，不能實現多通路并行采樣，不能實現多通道同時程式控制放大，不能進行同步頻率監測，采樣位數較低，採用外部存儲器方式，對數據進行查詢的訪問方式，安裝調試不靈活等缺點，提出了應用現代微電子技術電子設計自動化（ eda ）技術實現對在線監測數據採集系統的改進。 -
Right now, axcen photonics corp can offer the optical transceivers including gbic, sfp single - mode and multiple - mode optical transceivers for optical data communication, telecommunication, cable tv systems. furthermore, the optical transceivers for long - distance 1000base - lhx and 1000base - zx applications are offered as well. in order to meet the needs of clients, the transmission speed of the optical transceivers ranges from 155mpbs oc - 3, 2. 488gbps oc - 48, fiber channel, gigabit ethernet, fast ethernet, 4x fiber channel, sfp copper
創威光電整合了光機電等專業人才，從半導體雷射的封裝製程，特性量測到整體光收發器的設計與製造皆已完成開發及量產的階段，目前可提供應用於數據通信，電信通訊，有線電視系統及光纖數據迴路等用途的多款光收發器，其產品包括:單模與多模gbic ， sfp光收發器及長距離應用於1000base - lhx ， 1000base - zx等光收器，就傳輸速率而言，目前創威光電可提供從155mbps oc - 3 ， 2 . 488gbps oc - 48 ， fiber channel ， gigabit ethernet ， fast ethernet ， 4 x fiber channel ， sfp copper等不同速率產品，以迎合顧客需求，另外，本公司亦可配合客戶要求，提供客制化產品設計及製造。 -
In the second part, the necessity of employing differential demodulation in rapid changing channel was explained, performance of multiple symbol detection of mdpsk and decision feed back multiple symbol detection were analyzed. then we present a new differential demodulation algorithm. the decision data is used to recover the carry phase. given the same observation intervals, this demodulation algorithm has almost the same performance, but the receiver is much more simplified
第二章首先指出了通道參數變化劇烈的情況下，採用差分解調的必要性；分析了多碼元差分解調和數據判決反饋解調演算法的性能和抑制噪聲的能力；在此基礎上提出了一種新的差分解調方案：利用判決數據輔助進行載波恢復，即在判決數據的輔助下，採用fir （ finantimpounsrespouns ）結構對載波相位進行預測的一種演算法，精心設計了該演算法的實現結構。 -
Because of the affection of noise and signal fading, in order to high data rate access and high quality, wireless communication need new technology to improve the link reliability and enhance the spectrum efficiency. mimo ( multiple input and multiple output ) can enhance the spectrum efficiency and increase channel capacity greatly, and reduce the multipath affection without spectrum band and power increasing. the 3th generation mobile communication wcdma is coming, with the purpose of putting mimo, stbc ( space time block coding ), space diversity into practice of wcdma systems, in order to lay the foundation of 3g toward 4g, this dissertation has done some research under this background
在發射機和接收機使用多個天線進行數據傳輸的多輸入多輸出（ mimo ）技術，可以在不增加帶寬和天線發送功率的條件下，成倍的提高頻譜利用率，提高系統的通道容量，還可以抗多徑干擾。第三代移動通信wcdma即將到來，為了將多天線技術（ mimo ） ，空間分集技術，空時編碼技術用到wcdma系統中去，為第三代移動通信向第四代移動通信系統平穩過渡奠定一定的基礎，需要做一些理論上的研究。 -
Data transmission based on multiple - communication channel in three gorges automatic hydrological data acquisition and transmission system
三峽水情自動測報系統中的多通道傳輸 -
Comparing with the traditional parallel interface chips, they have fewer legs ~ smaller volume and use fewer resources. therefore, multiple channel data selecting controls keyboar &. display and alarm are realized through at89c52 ? four eight - bit i / o interface, without extending other i / o interface, making the system simplified and reliability increased
單片機的i / o介面晶元全部採用最新的串列工作方式介面晶元，與傳統的并行介面晶元相比，它們引腳數少，體積小，佔用的口資源少，因此用at89c52的4個8位的i / o口就完成了多個通道的數據採集、控制、鍵盤、顯示和報警等功能，沒有擴展其它i / o介面，使系統接線簡化，可靠性提高。 -
Cdma ( code division multiple access ) technology is used in communication system abroad because of its merit, people use cdma technology to transmit data, image and also other different information in different sub - frequent bands of a broad channel. so a research, which combines multi - carrier signal processing and cdma technology and processes different sub - frequent bands signal at same time, is full of practicable value
Cdma技術由於其優點被廣泛採用在通信系統中，人們在一個寬帶通道的不同子頻段上使用cdma技術傳輸數據、圖像等不同信息，所以將多載波信號處理與cdma技術聯系起來進行研究，並且同時將不同的子頻帶信號進行處理是一個很有實用價值的問題。 -
In next mobile communication system to suffice more and more high - speed data service and demand of qos ( quality of service ) many new wireless link layer transport technologies are going to be used such as mimo ( multiple input multiple output ), ofdm ( orthogonal frequency division multiplexing ), channel coding and acm ( adaptive coding modulation ) etc. low density parity check ( ldpc ) codes were first discovered in 1960 ’ s which belong to linear block codes with their parity matrix being sparse
下一代移動通信系統為了滿足移動用戶對高速、寬帶數據傳輸業務不斷增長和更高服務質量的要求，採用了許多新的無線鏈路傳輸技術，包括多天線發射和接收技術、正交頻分復用技術、通道糾錯編碼技術和自適應編碼調制技術等。上世紀60年代提出的低密度校驗碼，是一種校驗矩陣為稀疏矩陣的線性分組碼。
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