narrow band data 中文意思是什麼
narrow band data
解釋
窄帶數據-
Digital down - converter ( ddc ) is one of the key technologies used by sdr receiver. the ddc module is a data processing part, following the ad sampler. the main function of ddc is extracting narrow - band data from broad - band data which is digitalized by ad sampler, down - converting these data to base - band, and decreasing data rate as well
Ddc數字下變頻器技術作為軟體無線電中的核心技術，是緊跟在ad采樣后的一個處理模塊，他的主要功能是從輸入的寬帶高速數字信號中提取所需的窄帶信號，將其下變頻為數字零中頻，並降低數據的速率。 -
Media gatewaytdmatm integrated access equipment is the main way of narrow band and data private line access. users may access fixed telephone network and dial - up access braodband man through twisted cable ; users may access broadband data network through adsl or ddn, or fr, etc ; mobile comminication users may access 2g or 3g mobile communication network through base station equipment and wireless gateway
媒體網關tdmatm綜合接入設備主要是窄帶和數據專線接入方式，用戶通過雙絞線可以接入固定電話網以及撥號接入寬帶ip城域網；用戶通過adsl或ddn 、 fr等可接入寬帶基礎數據網；移動通信用戶通過基站設備和無線網關可接入第二代或第三代移動通信網。 -
As regards the development of the service layer, shanghai telecom s objective is to transit gradually from providing narrow - band data service as the dominant service to providing broadband data service as the dominant service. 6
今後上海電信在業務層上的建設目標是：從以窄帶數據業務為主、兼顧寬帶數據業務，逐步發展為寬帶、窄帶業務並舉，最後達到以寬帶數據業務為主，兼顧窄帶業務。 -
At the same time realizes data collection, data analysis, series of parameters setting, narrow band warning, axis orbit analysis and real time or historical data transport etc. 2 ) precise analysis and diagnosis through lan
並能在監測的同時實現實時信號採集、分析處理、組態設置、窄帶報警、軸心軌跡以及實時/歷史數據遠程傳輸等功能； 2 、具有網路化精密分析診斷功能。 -
The simulation results shown that it is unbiased estimation for the wide band procedure and the narrow band procedure in the burg method and it approaches to the true using less data records in the condition of 1ower snr
伯格法可以從信噪比較低的條件下從噪聲中提取正弦信號，並且可以用比較少的數據記錄進行估計，估計結果很接近真實值。 -
The technology of very low bit rate for hf ( high frequency ) communication means that, one technology of ecm ( electronic counter measures ) resistant communication is developed for low bit data message exchange in the time of battle which data communication is destroyed by electronic disturber. it is regarded by armies in the battle of information, because that it can overcome the very low snr ( signal noise ratio ), very high narrow - band interference and multipath with maxium delay of fifty millisecond
短波最低限度通信技術是在戰時強電磁干擾情況下能實現保證最低限度的數據報通信的一種抗干擾通信技術。由於其能有效的克服極低信噪比、較強的窄帶干擾和幾十毫秒的多徑，在信息戰中受到各軍高度重視。 -
The normal user must go through the access network and backbone to access the internet via icp there are always high - rate and broadband lines connected to the backbone, the backbone of telecom can provide wide enough bandwidth for all the data transmission as more and more optic fiber with wdm and dwdm technologies have been paved. but " the last mile " from user ' s home to central office is still narrow - band and analog, which becomes bottom - neck of the communication subnet preventing it from being widen
一般用戶使用internet時要經過接入網，電信主幹網，最後達到icp （ internetcontentprovider ：因特網內容提供商） 。其中icp一般有著高速寬帶的線路與主幹網相連，而主幹網由於波分復用或密集波分復用的光纖技術的大量使用，使得其可提供足夠的帶寬使用，但是，接入網? ?從用戶家庭到電信網的局端的這「最後一公里」 ，仍然是窄帶的、模擬的，這「最後一公里」就是電信網寬帶化的瓶頸。 -
This task uses the ds - ss technology, and researchs the important technologies, such as synchronization of ds - ss, rake receive, narrow - band interference suppression, etc. these technology are useful for the voice - band channel of hf. i designed one system of very low bit rate for hf data communication, and completed the softwave module design of the system. i get the result of system ' s simulator, it ' s useful for the system realization
根據短波音頻帶寬通道的特點，重點對系統的擴頻同步技術、 rake接收技術和窄帶抗干擾技術進行了專題的研究。並根據自己多年的科研經驗，設計了一種具有實際意義的短波最低限度通信系統，並對實際的軟體實現進行了模塊化的設計。
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