modulation type造句
例句與造句
- in the first stage, due to the research in years on the magnetic field modulation type doubly fed brushless machine, two doubly fed generators was requested to fabricate
首先，利用我們研究所在磁場(chǎng)調(diào)制式無(wú)刷雙饋電機(jī)的多年研究成果，研制并測(cè)試兩臺(tái)無(wú)刷雙饋發(fā)電機(jī)。 - the recognition method for analogue modulations has less computational complexity, and the method for digital modulation has flexibility and can be easily extended to the coming modulation types
本文的模擬調(diào)制識(shí)別算法具有運(yùn)算量小的特點(diǎn)，而數(shù)字調(diào)制識(shí)別算法具有較好的擴(kuò)展性。 - automatic recognition of modulation signals is a required function of software-defined radio receiver . the automatic classification of modulation types is being discussed recently and there are so many ways
信號(hào)調(diào)制樣式的自動(dòng)識(shí)別是軟件無(wú)線(xiàn)電接收機(jī)必須具備的功能之一，調(diào)制識(shí)別是近年來(lái)信號(hào)處理領(lǐng)域研究的熱點(diǎn)問(wèn)題。 - as the parts of sdr, such system should also be extensible . any modulation types, if can use complex carrier orthogonal modulation, such as am, ask, msk, qam, etc, can be used in the system
這種模型的可擴(kuò)展性和移植性均很強(qiáng)，只須加入部分功能模塊即可實(shí)現(xiàn)多種調(diào)制，文中給出了實(shí)現(xiàn)am、ask、msk和qam調(diào)制的具體算法。 - pulse signal is connected by the customer . signal can be sine wave or square wave . modulation frequency can be to 1mhz few model can be to 10mhz; inner modulation type no need signal from out side
外調(diào)制式激光器留有專(zhuān)用的信號(hào)接口，由用戶(hù)接入脈沖信號(hào)，信號(hào)可以是正弦波,也可以是方波，調(diào)制頻率可到1mhz個(gè)別型號(hào)調(diào)制頻率可到10mhz。 - It's difficult to find modulation type in a sentence. 用modulation type造句挺難的
- the thesis presents automatic recognizing methods of modulation types based on statistic model which can enhance processing speed . frequency measurement through phase to recognize modulation types is another main work in this paper
另外，采用基于統(tǒng)計(jì)模式的方法做了調(diào)制類(lèi)型自動(dòng)識(shí)別，提高了處理速度；本文還給出了相位測(cè)頻法進(jìn)行調(diào)制類(lèi)型識(shí)別和檢測(cè)。 - the thesis presents automatic recognizing methods of modulation types based on statistic model which can enhance processing speed . frequency measurement through phase to recognize modulation types is another main work in this paper
另外，采用基于統(tǒng)計(jì)模式的方法做了調(diào)制類(lèi)型自動(dòng)識(shí)別，提高了處理速度；本文還給出了相位測(cè)頻法進(jìn)行調(diào)制類(lèi)型識(shí)別和檢測(cè)。 - to increase the spectrum efficiency of the ofdm system, a novel aofdm ( adaptive ofdm ) system, which can change its modulation type and length of guard interval according to the estimated channel information, is designed
為了提高ofdm的頻譜效率，我們?cè)O(shè)計(jì)了一個(gè)能根據(jù)信道特征動(dòng)態(tài)改變其調(diào)制方式以及保護(hù)間隔的自適應(yīng)ofdm(aofdm，adaptiveorthogonalfrequencydivisionmultiplexing)系統(tǒng)。 - for the digital modulation recognizer, the blind identification and equalization algorithm based on second-order statistics is applied to equalize the received signals firstly, and then the modulation type used can be figured out according to the shape of the rebuilt constellation
對(duì)于數(shù)字調(diào)制方式，本文首先采用基于二階統(tǒng)計(jì)量的信道盲均衡算法對(duì)接收信號(hào)進(jìn)行均衡，再利用信號(hào)星座圖的形狀判別具體的調(diào)制類(lèi)型。 - some modulation parameters, such as the carrier frequency and the symbol rate, can be estimated prior to the recognition of modulation types . such other parameters as the modulation index, the modulation frequency deviation, and the signal broadband can be further estimated after recognition
部分調(diào)制參數(shù)如載波頻率、符號(hào)速率在識(shí)別之前獲得，在識(shí)別完成之后可以進(jìn)一步估計(jì)調(diào)制指數(shù)、調(diào)制頻偏、信號(hào)帶寬等其余參數(shù)。 - take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated . an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization . how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了載波同步和碼元定時(shí)同步與調(diào)制方式盲檢測(cè)算法的關(guān)系；以自適應(yīng)單載波中高階累積量調(diào)制方式盲檢測(cè)算法為例，對(duì)于載波同步誤差引起的頻偏問(wèn)題，提出一種基于頻偏穩(wěn)健的mdpsk信號(hào)調(diào)制方式盲檢測(cè)算法；對(duì)于未知調(diào)制方式信號(hào)的定時(shí)同步問(wèn)題，提出一種盲定時(shí)估計(jì)算法，該算法可以估計(jì)mdpsk和mqam信號(hào)的定時(shí)同步信息，實(shí)現(xiàn)數(shù)字信號(hào)的同步分類(lèi)；提出了一種基于調(diào)制方式盲檢測(cè)的自適應(yīng)接收機(jī)結(jié)構(gòu)，把調(diào)制方式盲檢測(cè)，信噪比估計(jì)和同步解調(diào)聯(lián)合起來(lái)進(jìn)行，實(shí)現(xiàn)調(diào)制方式隨信道質(zhì)量而自適應(yīng)變化的信號(hào)的正確接收。 - take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated . an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization . how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了載波同步和碼元定時(shí)同步與調(diào)制方式盲檢測(cè)算法的關(guān)系；以自適應(yīng)單載波中高階累積量調(diào)制方式盲檢測(cè)算法為例，對(duì)于載波同步誤差引起的頻偏問(wèn)題，提出一種基于頻偏穩(wěn)健的mdpsk信號(hào)調(diào)制方式盲檢測(cè)算法；對(duì)于未知調(diào)制方式信號(hào)的定時(shí)同步問(wèn)題，提出一種盲定時(shí)估計(jì)算法，該算法可以估計(jì)mdpsk和mqam信號(hào)的定時(shí)同步信息，實(shí)現(xiàn)數(shù)字信號(hào)的同步分類(lèi)；提出了一種基于調(diào)制方式盲檢測(cè)的自適應(yīng)接收機(jī)結(jié)構(gòu)，把調(diào)制方式盲檢測(cè)，信噪比估計(jì)和同步解調(diào)聯(lián)合起來(lái)進(jìn)行，實(shí)現(xiàn)調(diào)制方式隨信道質(zhì)量而自適應(yīng)變化的信號(hào)的正確接收。 - the so-called automatic recognition of modulation ( amr ) schemes automatically classifies the modulation types from the samples of received signal by abstracting the related features such as amplitude, frequency, and phase, followed by employing proper recognition algorithms based on the fast digital signal processing techniques and advanced computing technology . the result of amr can be used in the following processing blocks such as demodulation, supervision processing and anti-interference processing and so on
所謂調(diào)制類(lèi)型自動(dòng)識(shí)別(amr)是根據(jù)接收信號(hào)樣本提取出振幅、頻率和相位的特征參數(shù)，然后借助信號(hào)處理技術(shù)和計(jì)算機(jī)快速處理能力，采用合理算法進(jìn)行處理，從而實(shí)現(xiàn)對(duì)未知已調(diào)波調(diào)制類(lèi)型的自動(dòng)識(shí)別，為后繼的解調(diào)、監(jiān)控、抗干擾等處理奠定基礎(chǔ)。 - secondly, comparing with the algorithm that was given by english scholars a . k . nandi and e . e . azzouz in 1995, this dissertation presents a modified automatic recognition algorithm of six kind of digital modulation types such as 2ask, 4ask, 2psk, 4psk, 2fsk and 4fsk, which only uses four key features, and has a very great exaltation in the rate of correct recognition and the performance of signal to noise, we puts forward the constitution of the best threshold which is applicable to the signal that changes within the scope of the signal to noise rate ( snr ) from 5db to 30db, and the overall success rate is not lower than 92 % when snr is over 7db
其次,針對(duì)1995年英國(guó)學(xué)者a.k.nandi和e.e.azzouz提出的針對(duì)2ask、4ask、2psk、4psk、2fsk和4fsk這六種常用的數(shù)字調(diào)制信號(hào)識(shí)別的算法,提出了一種數(shù)字信號(hào)調(diào)制方式識(shí)別算法(dmra)的改進(jìn)算法。該算法僅利用四個(gè)特征參數(shù),就可以識(shí)別這六種調(diào)制方式,而且在調(diào)制識(shí)別率和信噪比性能上都有了很大的提高,能夠在信噪比不低于7db時(shí),對(duì)實(shí)際信號(hào)的識(shí)別正確率高于92%。并且提出了最佳門(mén)限的設(shè)置方法,設(shè)置的門(mén)限適用于信噪比在5db~30db范圍內(nèi)變化的信號(hào)。 - digital receiver and its forepart operational principle are discussed, then methods of instantaneous autorelation, short-time fourier transform, wigner distribution and wavelet analysis are introduced in detail . the advantages and disadvantages and the application range of these algorithms are given . based on the merits of these algorithms, a new method for signal modulation type analysis is presented
本文討論了數(shù)字接收機(jī)以及前端的工作過(guò)程，然后詳細(xì)闡述了瞬時(shí)自相關(guān)、短時(shí)傅立葉變換、wd算法、過(guò)零檢測(cè)和小波分析等各種算法在脈內(nèi)調(diào)制分析上的應(yīng)用，分析了各算法的優(yōu)缺點(diǎn)，提出一種并行處理模式：即針對(duì)不同的信號(hào)采用不同的算法對(duì)脈內(nèi)調(diào)制信號(hào)進(jìn)行分析。
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