frequency division system 中文意思是什麼
frequency division system
解釋
分頻制-
Therefore, the three fundamentals required to obtain high precise measurements are : 1 ) frequency stability and frequency difference stability of the double - frequency laser source as well as the stable equivalent length of bore ; 2 ) the measuring beam and the reference beam are placed very co - axially ; 3 ) capability of recording the sub - division of the period of phase change and a reversible counter system
因而干涉儀系統達到高精度的基礎是：頻率及頻差穩定的雙頻激光源、穩定的等效腔長；測量光與參考光合光後有很高同軸度的光路結構；能可靠記錄相位差變化周期數的細分及可逆計數系統三部分。 -
This thesis based on europe dvb - t cofdm ( coded orthogonal frequency division multiplexing ) system, does a lot of research from the development, the technique instrument of dttb to the whole dvb - t system structure and system flow. then brings forward its own ideas and optimizing advices after the stimulation of normal dvb - t system. firstly the thesis describes the needed conditions, the technical difficulties and the present problems of dttb
本課題就是基於歐洲dvb - tcofdm系統技術，從當前數字電視地面廣播的發展，數字電視地面廣播標準的技術手段到完整的dvb - t系統流程，做了一定的研究工作，並根據標準dvb - t系統做了建模模擬和分析，提出了對dvb - t系統的認識和優化設想。 -
The u. s. transmission format is called 8 - vsb ( for 8 - level vestigial sideband ), which is more susceptible to multipath distortion than the european system, called coded orthogonal frequency division multiplexing, or cofdm
美國的傳送格式是八階殘邊帶（ 8 - vsb ） ，這種格式比歐洲的編碼正交分頻多工（ cofdm ）系統，更容易受到多路徑問題影響。 -
A subspace - based blind channel estimator has been developed for space time coding orthogonal frequency division multiplexing ( stc - ofdm ) system with two transmit antennas and two receive antennas
摘要針對使用2個發射天線和2個接收天線並且採用循環前綴的空時編碼正交頻分復用系統（ stc - ofdm ） ，提出了一種通道盲估計演算法，並給出通道可被辨識的條件。 -
Telemetering system of frequency division type
頻分制遙測系統 -
Multiple - input multiple - output ( mimo ) technique, offers an effective way to combat and even exploit fading. another technique, orthogonal frequency division multiplexing ( ofdm ), proposed in 1960s, now has gained much attention with its ability to reduce system complexity
而60年代提出的正交頻分復用（ ofdm ）技術，由於能夠顯著簡化系統接收機的設計並具有優越的頻譜效率，近十多年來也獲得了極大的關注。 -
Due to the data transmission characteristics between tags and reader, space division multiple access ( sdma ), frequency division multiple access ( fdma ) and code division multiple access ( cdma ) are applied in a limited way in rfid system. therefore, time division multiple ( tdma ) has been generally accepted. according to tdma, there are aloha protocol, s - aloha, binary - tree protocol, clipped binary - tree protocol and others
解決這個問題必須要用到多路存取法，針對射頻識別系統中閱讀器與應答器之間的通信特點，空分多路法、頻分多路法、碼分多路法在rfid系統中應用都受到一定的限制，只能應用到一些特定的場合，一般採用時分多路法，按照時分多路法的演算法有aloha演算法、時隙aloha演算法、二進制樹型搜索演算法、修剪枝的二進制樹型搜索演算法等防碰撞演算法協議，分析了各自特點以及存在的缺點。 -
In this paper, the fundament, the system architecture and the application of orthogonal frequency division multiplexing ( ofdm ) were discussed, and the mathematic model of time - varying multi - path based on the discussion of mobile fading channel characteristic were analysed, and the channel model were discussed by computer simulation
本文首先簡要介紹了正交頻分復用（ ofdm ）的基本原理、系統組成以及ofdm的實際應用。在分析移動通道衰落特性的基礎上，分析了多徑時變通道的數學模型；並用計算機模擬的方法對通道模型進行了討論。 -
The application of adaptive allocation techniques to ofdm ( orthogonal frequency division multiplexing ) systems optimizes the use of system power
摘要自適應分配技術的應用能優化多用戶正交頻分復用系統功率的使用。 -
Because of enabling to provide high - rate and high - quality wireless and mobile communication service, orthogonal frequency division multiplexing ( ofdm ) system is becoming a very hot research topic recently, and it is especially one of the technical difficulties to estimate and equalize the time - varying ( tv ) dispersive channels
在移動無線通信中，由於能提供高速率和高質量的通信服務，正交頻分復用（ ofdm ）技術成為當前國際上的研究熱點，而時變色散通道的估計和均衡問題是其中的技術難點之一。 -
A digital base band adaptive predistortion method to compensate nonlinear distortions introduced by a high - power amplifier ( hpa ) in orthogonal frequency division multiplexing ( ofdm ) system is proposed
摘要提出了一種用於正交頻分復用（ ofdm ）系統中補償由大功率放大器引起的非線性失真的基帶自適應預失真方法。 -
Based on above - mentioned schemes, the power detection system based on tms320vc5410 is designed, which realizes collection, a / d, digital signal processing. keyboard. display and uart ? the ad73360 gather chip commonly used in power system is used in front of the power detection system, and the circuit of frequency multiplication phase - locked is consisted of phase - locked loop device ? d4046 and frequency division device cd4060 to produce the gather signal of ad73360 frequently, the gather wave and re sult can be displayed on lcd
基於上述方案，本人設計開發了基於tms320vc5410的電力採集檢測系統。基本實現了採集、 a d轉換、數字信號處理、鍵盤顯示、異步通信等系統軟硬體設計。該系統前端採用電力系統常用的ad73360採集晶元，鎖相倍頻電路由鎖相環cd4046與分頻器cd4060一起構成，產生ad73360採集觸發信號。 -
As a unique multiple access system based on the mcm technology, the orthogonal frequency division multiple access ( ofdma ) is a promising technology for bws
作為一種基於mcm的特殊多址接入技術，在寬帶無線城域網建設中， ofdma接入技術有著其特有的優點及廣泛的發展前景。 -
Uestc is in charge of the tdd downlink that bases on fpga. ofdm ( orthogonal frequency division multiplex ) is the key technology of b3g system
現在已經進入項目的第二個階段，電子科技大學負責b3gtdd方式的下行鏈路設計，重點是基於fpga （現場可編程門陣列）的實現研究。 -
Initially, pdh was introduced to improve and replace the obsolete analog frequency division multiplex ( fdm ) system. however, it was soon found that pdh had shortcomings such as difficulty in management, high construction cost, limited applications and lack of connectivity standards at the optical layer. thus, in the early 1990s, synchronous digital hierarchy ( sdh ) was introduced in the transmission system
Pdh最初引入是為了改進和替代老式的模擬頻分復用器系統，但很快被發現pdh管理困難、造價高、應用范圍窄，且缺乏在光層面上的連接標準，因此90年代初期， sdh （ synchronousdigitalhierarchy ）標準被首先引入了傳輸系統。 -
The system is consisted of tuner, cofdm ( coded orthogonal frequency division multiplexing ) demodulator and usb2. 0 controller
整個系統由調諧器， cofdm解調部分， usb2 . 0控制器三大部分組成。 -
A new carrier synchronization technique for orthogonal frequency division multiplexing system
正交頻分復用系統中新的載波精同步演算法 -
Recently, multiple input multiple output ( mimo ) system which originates from the employment of multiple antennas at transmitter and receiver has many advantages such as large system capacity, high spectral efficiency. on the other hand, orthogonal frequency division multiplexing ( ofdm ) which bases on the orthogonal transmission of sub - carriers also has some obvious merits such as strong anti - multipath ability, high spectral efficiency. the combination of the two techniques mimo - ofdm, has become a hotspot recently and regarded as promising technique for future next - generation mobile communication systems
近來，在無線通信系統中的收發兩端同時使用多根天線的多入多出（ mimo ， multiple - input - multiple - output ）通信結構，具有系統容量大、頻譜效率高等優點;基於正交的多路子載波并行傳輸的正交頻分復用（ ofdm ， orthogonalfrequencydivisionmultiplexing ）技術，具有抗多徑能力強、頻譜效率高等優點，二者的結合，即mimo - ofdm技術，被認為是構建下一代移動通信系統的框架技術。 -
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。 -
Orthogonal frequency division multiplexing ( ofdm ) has been widely used in many systems such as digital audio broadcasting system ( dab ), digital video broadcasting system ( dvb ), high definition tv ( hdtv ) and wireless local network. ofdm will be critical technique in broadband wireless mobile communication system in future
正交頻分復用（ ofdm ）技術已經被廣泛應用於數字音頻廣播、數字視頻廣播、高清晰度電視、無線局域網等系統中，在未來的寬帶無線移動通信系統中， ofdm也將是一項必不可少的技術。
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