準同步通信 的英文怎麼說
中文拼音 [zhǔntóngbùtōngxìn]
準同步通信
英文
plesiochronous communication-
Some message described in the thesis, such as the basic structure of gps - oem, the consists of positioning system, the binary format of almanac and ephemeris, the method and the skill of processing orignal data through singlechip, and so on, is very useful for studying gps and its applications in integrated navigation, and re - development on gps - oem
同時亦可與gis (地理信息系統)配套使用,實現在crt上地圖背景下的運動軌跡顯示。第二個產品, gps時鐘/同步系統,利用全球衛星定位gps衛星的標準utc時間,可在全球得到同步的準確時間。設備採用motorola的12通道gpsoem接收機。The third, after theoretically analyzing, the following practicable methods are put forward : 1 ) automatically pick - up the synchronous information by analyzing the spectrum of intercepted video - leaking information ; 2 ) realizing the phase lock and the electronic image stabilization by integral - projection and differential - positioning ; 3 ) improving the effect of accumulation mean filter and the pectination filter by using electronic image stabilization ; 4 ) automatically adjusting image acquisition parameters by detecting the image entropy, therefore the quality acquired image is improved ; 5 ) to realize the quantitative test of a leaking extent, a standard test picture was designed. finally, a proto type for leaking information processing based on our techniques mentioned above and the virtual instrument principle was designed and tested
在理論分析的基礎上,提出了以下的實用技術: 1 )用譜分析方法從截獲的信息中自動提取同步信息; 2 )用積分投影、微分定位的方法進行相位檢測,實現可靠的鎖相和電子穩像; 3 )將電子穩像技術用於重加濾波和梳狀濾波的濾波方法,改進了濾波效果; 4 )通過檢測圖像信息熵實現圖像採集參數的自動調整,改進了圖像採集的質量; 5 )設計了用於儀器定標的標準測試圖,可以對泄漏信息進行定量檢測。Along with the growth of the building industry for lease, the progress of the mechanical equipment management is not the same with it. the traditional methods - keeping business records manually, lease ( giving back ) records, calculating rent charge sum, counting rent things, ca n ' t meet the needs of the develop of business. the general headquarters of the company can only exchange information with their branches through telephone, fax or post
隨著建築租賃業的發展,其機械設備管理並沒有得到同步發展,傳統的方法? ?採用手工記帳、出租(歸還)登記、計算租費金額以及統計出租情況,已完全不能滿足企業業務發展的需要,加之公司總部同地處異地的分公司信息交流只能通過電話、傳真或郵寄等方式進行,無法及時準確地了解分公司的業務情況,有的建築設備租賃公司已開始使用設備管理軟體,但也只是剛剛起步,還存在許多問題。The subject has mainly finished designing and debugging software and hardware of a / d decode module, fpga video processing module, video data frame deposit module, base clock produce module, d / a encode module, i2c bus control module, etc. a / d decode module gathers analog tv signals and realize video decode ; fpga video processing module deals with the data after decoding and produces systematic logic control signal ; video data frame deposit module offers the buffering area to a large n umber of high - speed video data ; base clock produce module through input basic video signal offers system accurate relevant synchronous signal ; under control of video processing module d / a decode module convert digital video data into compound tv signal which can be shown in tv directly ; i2c bus control module is used to initialize the chip of system by simulating i * c bus timing
本課題主要完成了a d解碼模塊、 fpga視頻處理模塊、視頻數據幀存模塊、基準時鐘產生模塊、 d a編碼模塊、 i ~ 2c總線控制模塊等部分軟、硬體設計及調試。其中a d解碼模塊採集模擬電視信號實現視頻解碼; fpga視頻處理模塊對解碼后的數據進行去噪處理的同時還負責系統的邏輯控制;視頻數據幀存模塊為大量高速的視頻數據提供緩沖區;基準時鐘產生模塊通過輸入基準視頻信號為系統提供精確的相關同步信號; d a編碼模塊在視頻處理模塊的控制下把數字視頻數據轉換成復合電視信號供顯示用: i ~ 2c總線控制模塊模擬i ~ 2c總線時序實現對系統中編、解碼晶元的初始化。An improved interactive dynamic multimedia synchronization model ( idsm ) based on tpn is proposed. the new model takes the dynamic synchronization properties and the demands of the priority of key medium and the function of user interaction in the distributed systems into account, introduces the allowed blocking time, backtracking rules and so on to handle the problems caused by random delay, blocking or lost packets, and describes the temporal behavior of multimedia information stream fully, accurately and formally. 4
提出了一個新的基於tpn網的互動式多媒體動態同步模型idsm ,該模型充分考慮到分散式環境中多媒體的動態同步特性以及關鍵媒體的優先權和人機交互要求,通過引入容許阻塞時間、回溯演算法等有效克服了網路隨機延遲、阻塞和丟包等因素的影響,以形式化的方式完整、準確地描述了多媒體信息流的時間行為。Fully considering the system ' s reliabilty, being real - time, speed and extensibility, it finally chooses the sdh as the system network of cors through deep compration and alalysis of four special data lines supplied by china telecom, so that an effective interconnection among the stations and the workstations in the control - center comes true
摘要充分考慮系統可靠性、實時性、通信速率、可擴充性等因素,通過對中國電信提供的4種數據專線服務的綜合分析比較,選擇了同步數字體系作為系統通信網路,實現了控制中心各工作站和各基準站之間的高速互聯。In chapter 5 we discuss the design of ieee754 standard fpu ( floating point unit ). processor and uart ( universal asynchronous receiver transmitter ), these cores are used in this dissertation, fpu is used for floating point complex fft processor, uart is used for fft processor " s peripheral and our test platform. in chapter 6 we discuss the design for testability, including atpg, bist and jtag method, discuss the different verification and simulation strategy in soc scale facing to different modules, build up the test platform which is used to test high performance application specified digital signal processing processor. in chapter 7 we summarize the research results and creative points, and point out the further work need to do in the future
第五章提出了基於ieee754浮點標準的浮點運算處理器的設計和異步串列通信核的設一浙江大學博士學位論文計,提出了適合硬體實現的浮點乘除法、加減運算的結構,浮點運算處理器主要用於高速fft浮點處理功能,異步串列通信核主要用於pft處理器ip核的外圍擴展模塊以及本文所做的驗證測試平臺中的數據介面部分第六章提出了面向系統級晶元的可測試性設計包括了基於掃描測試atpg 、內建自測試bist 、邊界掃描測試jtag設計,在討論可測試性設計策略選擇的問題上,提出了針對不同模塊進行的分別測試策略,提出了層次化jtag測試方法和掃描總線法,提出了基於fpgaMoreover, the higher harmonic order is, the lower distinguishability, and, as a result, the assessment accuracy becomes bad. considered its prominent localization both in time - domain and in frequency - domain, wavelet is used to the field of assessing harmonic impedance for the first time. we choose chaari wavelet because of its special band frequency characteristic, which can stratify signals synchronously and locate the distortion time precisely in assessing harmonic impedance
選取chaari小波為母小波,利用其特殊的帶通特性,對在公共連接點( pcc )采樣得到的電壓,電流畸變波形進行同步分層, 「突出」信號的畸變部分,提高了被分析信號的「信噪比」 ,以利於諧波阻抗估計準確度的提高。It contributes to the deeper comprehesion of these probability distributions, affords more detailed theoretical basis for further studying and simulating satellite mobile channels, ? theoretical analyses and discussions of the models which are often used in the study of the propagating characteristics of satallite mobile channels are given ; meantime, some discussions on the work of model simulations are also given, ? incorrect derivation of the equality between c. loo model and corazza model in some other papers is pointed out. via the conception of received power, we derivate that in the rural environments these two models really have the equal relationship by the way of theoretical derivation and simulatant fittings. therefore, it is able to use corazza model in studying the characteristics of satellite mobile channels in the rural environments and able to avoid the iterant work of modeling, in order to enhance the efficiency and accuracy of research work, ? detailed processes of simulating lutz model by using matlab6. 0 _ simulink4. 0 and the results of comparisions are given
本文包含有以下的主要內容: ?對衛星移動通信通道傳播特性研究中常用的三個概率分佈給出了詳細的推導過程;以便對這幾個在衛星移動通信通道傳播特性的研究中常用的概率分佈函數有更深的理解,對進一步研究衛星移動通信通道傳播特性和對通道的建模提供了更為詳盡的理論基礎; ?對衛星移動通信通道傳播特性的研究中常用的通道模型進行了理論上的分析和討論,並對衛星移動通信通道建模的研究工作提出了一定的看法; ?指出了以前的文獻中關于c . loo模型和corazza模型的等同性的證明錯誤;並從接收信號功率的角度出發,通過理論推導及模擬曲線擬合重新證明了在鄉村環境下,這兩個模型的確是具有等同性的;從而在對鄉村環境下的衛星移動通信通道傳播特性進行研究時,可以只採用corazza模型來對實際的通道進行建模,這樣可以避免重復的建模工作並提高研究工作的效率和準確性; ?給出了lutz模型在matlab6 . 0 _ simulink4 . 0環境下的軟體模擬實現的詳細過程和整體模擬測試的對比結果,保證了該模型在硬體實現時的可靠性和可行性,從而可以將它們應用於指導模型的硬體模擬實現並可以降低硬體實現時的風險。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。For digital audio encoding and decoding modules, delta - sigma modulation is introduced and audio data, preambles with accessorial data are multiplexed according to the digital audio interface standard ; for carrier wave, pll frequency synthesizer is used ; for frequency modulation, voltage control oscillator is taken ; for demodulation, pll frequency discrimination is adopted
調制方式,並按照數字音頻介面標準對音頻數據、同步字和附加信息進行通道復用;對于載波信號,採取鎖相環頻率合成技術手段;對于頻率調制,採用壓控振蕩器;對于解調電路,採取鎖相環鑒頻電路。The concept of " timing " in the article is not the clock in our ordinary living, but syntheses which is made up of some frequency source in the signal generator ( such as cs atom frequency standard, rb clock & high accuracy quartz crystal oscillator ) which produces the primary frequency, the matching input interface and the matching output interface and controlling circuit etc. for example, bits is a kind of timing equipment, which is used to control the timing of some functions
本文論及的「時鐘」概念不是指日常生活中使用的鐘表,而是由產生基準頻率的信號發生器(如銫原子頻率標準、銣鐘及高精度石英晶體振蕩器等)中的某種頻率源以及相配套的輸入、輸出介面和控制電路等組成的一整套具有特定同步定時功能的綜合體。如bits就是一種時鐘設備,它提供用在通信系統中控制某些功能的定時的時間基準設備,時鐘提供的信號稱為基準信號、定時信號或同步信號。Therefore, it is necessary to mount timing system alone in synchronization network node and the place where there are more telecommunication equipments and the important hinge, which supplies the primary synchronization signal conformed to the standard
因此,有必要在同步節點處或通信設備較多的地方以及通信網的重要樞紐處,單獨設置時鐘系統,對所在的通信樓的設備提供合乎標準的同步基準信號。It first introduces the mpeg - 2 standard and the grammar structure of the ts. then it describes the principle of synchronization and multiplexing in digital communication. the synchronization comprises the carrier synchronization, bit synchronization, group synchronization and network synchronization while the multiplexing includes bit multiplexing, word multiplexing and frame multiplexing
本文首先介紹了mpeg _ 2標準及其mpeg _ 2傳輸流語法結構,接著闡述了數字通信中的同步和復接理論,同步包括載波同步、位同步、群同步和網同步,復接包括按位復接、按字復接、按幀復接。To the primary contradiction of real - time interactive visual simulation, limited bandwidth of network and real time transmitting parameter of relative to move sight, the control mechanism of 3 - d visual object is discussed, under the direction of hla idea, the visual federal object model vfom is established to describe the visual data distributing ; the author designed a grammar of vfom context and a turing conversion mechanism, it will support exploitation of visual simulation in different field ; the author analyses and apply opengl to design a method of implement real - time interactive visual simulation on pc, in additional with object - oriented program technique network communication technique multithreading technique, implement pc - virsp. there are 7 chapters in this thesis. in chapter 1, the developments of virtual simulation is looked back, the aim and significance and the main search content is put forward
論文針對實時交互視景模擬的主要矛盾,即網路有限帶寬與視景運動交互參數實時傳輸矛盾,探討了三維視體運動控制機理,結合hla思想,建立視景聯邦對象模型( vfom - visualfederalobjectmodel )來描述視景數據分佈;並設計了模擬實體鏈描述文本文法及其存儲轉換機制,有效支持多領域視景模擬系統開發;分析並應用圖形介面標準opengl ,設計了基於pc機的實時互操作視景生成方法;針對網路分佈環境下視景模擬實時交互需求,設計視景運動同步控制方案;並綜合應用了面向對象編程技術、網路通信技術、多線程技術,實現了基於pc機的視景實時互操作支撐平臺( pc - vrisp ? real - timeinteractivesupportingplatformforvirtualsimulationbasedonpersonalcomputer ) 。A kind of mud based on transversal equalizer is recommended, and the performance analysis of ds - cdma systems based on that mud has been done under synchronous channels. then the expression of output signal is deduced. also, the relations among sinr of output signal, snr and correlation matrix of spread code the least mean square error ( lms ) adaptive algorithm is applied to the mud
論文引入基於橫向均衡結構的多用戶檢測器,用矩陣方法推導了awgn通道下、同異步系統中信號輸出表達式,依據最小均方差準則,討論了同步方式下檢測器的輸出信號干擾比與信噪比、擴頻碼相關陣以及用戶功率大小等因素間的關系。Satellite earth stations and systems - harmonized en for mobile earth stations of geostationary mobile satellite systems, including handheld earth stations, for satellite personal communications networks in the 1, 5 1, 6 ghz bands under the mobile satellite service covering essential requirements under article 3. 2 of the r tte directive
衛星地面站和系統.包括手持式地面站的同步移動衛星系統的移動地面站及包括r tte指令中3 . 2條款基本要求的移動衛星業務中頻帶為1 . 5 1 . 6ghz的衛星個人通信網路用協調的en標準After the system has been synchronized, we first use the least square method to make channel estimation, then separate the channel response information from the channel noises by dft. a weighting function based on the minimum mean square error ( mmse ) criteria can be applied to the time domain channel impulse response
在系統同步條件下,首先使用最小平方方法來估計通道響應,然後利用離散傅利葉變換的性質把通道響應信息和通道噪聲分離,並在時域按最小均方誤差準則做加權處理。To increase the features of rrssms, we improved the reliability of application - level to build a more reliable asynchronous communication model over the existing corba event service, and presente d a technique of web - based active information publication supported by distributed object computing means embedded in web architecture. in this method application server can push information to the web client with the active information publication scheme
同時,為了提高web應用系統的實時性,以更適合遠程監控系統的需要,在應用層對corba事件服務標準的可靠性作了改進,構建了中,一個可靠的異步通信模型,並結合對象web技術提供的分散式對象計算平臺,實現了一個web主動信息發布機制,利用該機制,應用服務器可以主動把信息推送到web的客戶端,提高了web系統的實時性。Training - based simulation model and algorithm of plesiochronous digital hierarchy fiber communication system
基於訓練的準同步數字系列光纖通信系統模擬模型與演算法分享友人