useful modulation 中文意思是什麼
useful modulation
解釋
有效調制- useful : adj. 1. 有用的，有益的，有效的，有幫助的。2. 〈俚語〉值得稱贊的，精通…的 （at）。adv. -ly ,-ness n.
- modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
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The precise measurement data can be useful for antenna design and slot coupling studding. this paper gives it ’ s deduction through reciprocity principle and the structure of the optically modulated scatterer system. an applied optically modulated scatterer system is designed and photodiodes are used as modulation module
本文給出以互易原理為基礎的光調制散射器測量法的理論推導，並用光電二極體光導開關作為散射器中間部分的光調制單元，設計出了實用的光調制散射器微波測量硬軟體系統。 -
As the step of the color tv ( the second generation ) to the digital tv ( the third generation ) is larger and larger, the research of digital television terrestrial broadcasting ( dttb ) become more and more important in china, we are concentrating on the standard of dttb which is suit for our country after describing and analyzing the technical stipulation and speciality of dttb, this paper compares atsc 8 - vsb with dvb - t cofdm and isdb - t bst - ofdmo the emphasis of this article lies in the technical solution about transferring system, channel coding is important component of dttb, which can resist from the bad circumstances o because of lots of varieties and different performance, channel coding become one of the emphasis of the research work this paper analyzes and researches the theory and performance of the different channel coding particularly, points out an effective theoretic analysis method and computer demo of performance comparison a theoretical method for estimating the performance of concatenated codes is proposed in this paperc this is achieved by combining the performance of single level coding rayleigh fading channel and the character of channel modulation it may be useful to research and development of the future digital television terrestrial broadcasting standard of our country
通道糾錯編碼是數字電視地面廣播傳輸系統的重要組成部分，是抵禦地面惡劣環境的有效手段。由於通道編碼的種類繁多，性能各異，因此是目前研究工作的重點之一。本文詳細分析和研究了幾種通道糾錯編碼的原理和性能，並針對外碼內碼級聯糾錯結合地面通道瑞利衰落提出了一種有效的理論分析方法和性能的計算機比較演示方案，總結了不同級聯方案的性能特點，對於我國目前的數字電視地面廣播標準的研究和通道級聯糾錯方案的確立及其參數選擇具有一定的參考價值。 -
Transmition velocity relys on the style of encode and modulation essentially during modern data transmition for the quality of using line bandwidth and the immunity of code ties on them tightly. but it is important that the velocity of data transmition reaches its limitation in fact for the interface of environment and cross - talk. so for the improvement of transmition velocity, we must analyze the characteristics of noise signal and the model of line deeply and then take some useful measures to better the immunity of modulation wave
在現代通信的數據傳輸過程中，傳輸速率本質上是由傳輸的編碼方式和調制方式決定的，因為編碼方式和調制方式直接決定了線路頻帶利用率和碼元抗干擾能力的好壞，因而直接決定了傳輸速率；但是在實際應用過程中，數據傳輸速率是不可能達到理想狀況的，因為環境干擾、串音干擾等因素的存在使得線路的頻帶不可能被完全利用起來；因此，必須認真分析線路的噪聲信號的特性以及噪聲線路的模型，以便在編碼方式和調制方式中針對性的做一些改進措施以改善調制波形的抗干擾能力，使得傳輸速率能夠進一步提高。 -
Newer monoclonal antibodies such as rituxan have proved very useful in chronic or refractory itp and studies are ongoing to determine the best regimens using this form of immune modulation
新型的單克隆抗體，如利妥昔單抗，已被證明對慢性或頑固性itp非常有效，而且有關這一免疫治療最佳方案的研究正在進行中。 -
In the thesis, an approach that is based on signal - space concepts is used to efficiently evaluate the ber performance of mpsk and mqam over an additive white gaussian noise channel. in particular, accurate ber approximations are obtained and shown to be in good agreement with system simulation results. it may be useful to research and development of digital modulation technologies in hfc of our country
嘗試採用基於信號空間的分析方法，給出了awgn通道中mpsk和mqam的ber的計算方法以及由這種方法得到的ber性能曲線，然後將信號空間分析法得到的結果與通信系統模擬的結果進行比較，證明其與模擬結果較好地吻合。
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