frequency spread造句
例句與造句
- Two kinds of typical wideband signal , frequency modulation ( fm ) signal and frequency spread signal , is analyzed qualitatively with wideband ambiguity function
以寬帶模糊度函數(shù)為工具定性地分析了兩類(lèi)典型寬帶信號(hào)，即調(diào)頻信號(hào)和頻率分集信號(hào)。 - Then , the system model and its simulation flow chart in matlab are introduced for mc - cdma system . and some technologies of mc - cdma and their functions in mc - cdma system are emphasized , such as frequency spread of data in frequency domain , ifft and cyclic prefix , and so on
然后在給出了mc - cdma系統(tǒng)模型和matlab仿真流程基礎(chǔ)上，重點(diǎn)討論了mc - cdma系統(tǒng)中的主要應(yīng)用技術(shù)及其在整個(gè)系統(tǒng)中的作用，例如數(shù)據(jù)的頻域擴(kuò)頻、 ifft變換和循環(huán)前綴等。 - But in the east , 30 ~ 60 - day low frequency propagates toward north and west and 10 ~ 20 - day low frequency spreads to south from mid - latitude as well as to east from 90 " e . 10 - 20 - day and 30 - 60 - day low frequent rain band centers , located in south china , upper - middle yangtze basins , northeast china , north china and the west part of china , are all important parts of asian summer monsoon rainfall
東部地區(qū)， 30一60天振蕩有明顯的向北及向西傳播; 10一20天低頻降水隨位相從中緯度向南傳播，同時(shí)從90 ? e向東傳播。東部地區(qū)的10一20天和30一60天低頻雨帶中心都是東亞夏季風(fēng)降水的重要組成部分，當(dāng)?shù)氐南募撅L(fēng)降水受這兩種低頻振蕩調(diào)制。 - To improve anti - jamming technique by spread spectrum close to monochromatic frequency , so that enhance the ability of anti - active - jamming and anti - passive - jamming , anti reconnaissance , anti - radiation missile , anti - stealth , by means of multi frequency spread spectrum and hopping spectrum instead of mono - frequency spread spectrum , realizing strong processing system for anti - interference signal , providing the method of generating of chirp signal and corresponding matched filter system
摘要為改進(jìn)線性調(diào)頻雷達(dá)系統(tǒng)所采用的在單色頻率點(diǎn)附近擴(kuò)譜抗干擾技術(shù)，加強(qiáng)制導(dǎo)雷達(dá)站具備抗有源、無(wú)源干擾，反偵察，抗硬殺傷的反幅射導(dǎo)彈和反隱身的能力，通過(guò)將單頻點(diǎn)擴(kuò)譜改為多頻點(diǎn)擴(kuò)譜跳譜，實(shí)現(xiàn)了高抗干擾信號(hào)處理系統(tǒng)，給出方案中在中頻段實(shí)現(xiàn)的線性調(diào)頻信號(hào)產(chǎn)生方法以及對(duì)應(yīng)的匹配濾波處理系統(tǒng)。 - This thesis researches some key techniques in digital mid - frequency transceiver under spread spectrum system . a digital mid - frequency spread spectrum transceiver is implemented on fpga , and has been timing - simulated on computer . this thesis firstly summarizes the basic theory of digital mid - frequency and software radio
本文針對(duì)擴(kuò)頻體制下的數(shù)字中頻收發(fā)機(jī)的關(guān)鍵技術(shù)進(jìn)行了研究，并以此為基礎(chǔ)在fpga上實(shí)現(xiàn)了一套數(shù)字中頻擴(kuò)頻收發(fā)機(jī)，通過(guò)了計(jì)算機(jī)的時(shí)序仿真驗(yàn)證。 - It's difficult to find frequency spread in a sentence. 用frequency spread造句挺難的
- More attention is paid tothetransmit diversity scheme and basic principle of multi - carriers ofdm technology . including the base of transmit diversity scheme - - rationale of mimo system , mathematical models of mimo channel , mimo channel capacity and all kinds oftheories , models , coding algorithms of transmit diversity schemes . and then areofdm - cdma technology and mimo - ofdm system . based on the technologiesabove , transmit diversity scheme is combined with multi - carrier ofdm technology , and space - time spreading ( sts ) is expanded from single carrier to multi - carrier to codewith space , time and frequency resulting in a space - time - frequency spreading ( stfs ) codingarithmetic . andthemost simple stfs whichhas2 tx , 1 r xand 2carriers isdesigned
設(shè)計(jì)了一種最簡(jiǎn)單的2發(fā)1收2載波的空時(shí)頻擴(kuò)頻碼,并根據(jù)2發(fā)1收2載波的空時(shí)頻擴(kuò)頻碼的規(guī)律推導(dǎo)出mt發(fā)mr收nc載波的空時(shí)頻擴(kuò)頻碼的系統(tǒng)模型,給出了相應(yīng)的空時(shí)頻擴(kuò)頻碼的發(fā)射機(jī)與接收機(jī)的基本框架與空時(shí)頻擴(kuò)頻碼的幾種合并方式。