frequency division 中文意思是什麼
frequency division
解釋
分頻率法-
This paper introduces the principle of the frequency division and presents the circuit design of the decimal frequency divider based on fpga. the vhdl language is used for the programming
摘要介紹了一種基於fpga的小數分頻器的分頻原理及電路設計，並用vhdl進行編程實現，並對這種小數分頻器的抖動進行分析和計算。 -
With the frequency division of wpd, etm uses shannon entropy as the criterion of determining whether or not dsi exist in certain wpd tree nodes and interference are suppressed successfully. lots of simulation data, lab data and on - site data have indicated that etm works with good efficiency, without pre - knowing of dsi information, extracts the phase of pd pulses accurately and can calibrate quantity of single type discharge
大量的模擬數據、實驗室實測數據以及現場實測數據處理結果表明，小波包變換熵閾值法抑制干擾能力強，無需事先確定干擾的分佈，能夠準確檢測局部放電信號的相位信息，對于單一的放電類型，可以確定放電量的大小。 -
Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high data rate datastream is transmitted using a number of lower data rate subcarriers
Ofdm （正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。 -
Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high rate datastream is transmitted using a number of lower data rate subcarriers
Ofdm （ orthogonalfrequencydivisionmultiplexing正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。 -
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。 -
Orthogonal frequency division multiplexing ( ofdm ) is a multi - carrier modulation method
正交頻分多路復用是一種多載波調制技術。 -
Aiming at the lower performance and floor effect of the traditional orthogonal frequency division multiplexing channel estimation, the ofdm channel estimation algorithm based on wavelet recursive least square support vector machine ( wrls - svm ) is proposed
摘要針對傳統多徑衰落下的ofdm導頻通道估計性能低下，地板效應的缺陷，提出了基於導頻的小波遞歸最小二乘支持向量機（ wrls - svm ）時變通道頻率估計演算法。 -
An apparatus and method having a de - interleaving memory and a controller is used for de - interleaving interleaved data in a coded orthogonal frequency division multiplexing receiver
正交編碼分頻多工接收器中一種具有一反交錯記憶體和一控制器，而用來將已交錯資料反交錯的裝置與方法。 -
Some novel technologies are also proposed, such as two dimensional spread spectrum ( 2d - ss ), self - encoded spread spectrum ( sess ), multiple input multiple output ( mimo ), orthogonal frequency division multiplexing ( ofdm ) and so on
另外，對目前新興的一些抗干擾技術，如二維擴頻、超寬帶、多天線、自編碼擴頻等技術也做了簡單分析。 -
At present, orthogonal frequency division multiplexing ( ofdm ) technique has been widely used in wideband wireless communication systems, such as dvb and ieee 802
作為一種可以有效克服通道多徑效應的傳輸手段，正交頻分復用（ ofdm ）技術正得到日益廣泛的關注與應用。 -
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。 -
This paper concentrates on the orthogonal frequency division multiplexing ( ofdm ) technique and some techniques to resist multipath fading. eliminate isi through use of a cyclic prefix. diversity techniques. using adequate ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading
本文研究了ofdm的基本原理及抗多徑衰落的一些措施，如加循環前綴，利用多徑進行分集接收，將ofdm與通道編碼及交織結合起來，頻域均衡。 -
Design of blazed grating used for frequency division and study on its diffraction action
用於分頻的閃耀光柵設計及衍射行為研究 -
General technical condition of frequency division on off signal transmission unit for coal mine
礦用頻分制開關量信號傳輸裝置.通用技術條件 -
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。 -
Methods of measurement for radio equipment used in satellite earth stations ; part 3 : methods of measurement on combinations of sub - systems ; section 4 : measurements for frequency division multiplex transmission
衛星地面站用無線電設備的測量方法.第3部分:分系統組合件的測量方法.第4節:分頻多路傳輸 -
Methods of measurement for radio equipment used in satellite earth stations. part 3 : methods of measurement on combinations of sub - systems. section four : measurements for frequency division multiplex f. d. m. transmission
衛星地面站用無線電設備的測量方法.第3部分:分系統組合件的測量方法.第4節:分頻多路傳輸測量
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