spread spectrum code造句
造句與例句
手機(jī)版
- spread spectrum code-sequence generator
擴(kuò)頻碼序發(fā)生器 - Firstly, the spread spectrum codes of ocdma system are discussed
首先，就ocdma系統(tǒng)的擴(kuò)頻碼展開了研究和討論。 - Wcdma use ovsf code as channel spread spectrum code . ovsf play an important role in . wcdma which offers flexible traffics
wcdma的信道擴(kuò)頻采用了長度可變的正交碼序列，即ovsf碼用作擴(kuò)頻碼。 - But ocdma system uses optical signal processing and fiber transmission, the design method of spread spectrum codes and the technique to implement will be distinct from radio cdma
但ocdma系統(tǒng)采用了光信號處理和光纖傳輸，因而在擴(kuò)頻碼的設(shè)計(jì)和實(shí)現(xiàn)方法等方面都具有特殊性。 - In cdma communication system, the users are identified by their different sprend spectrum codes which are unique to each user, namely they are identified by the cross correlation of spread spectrum codes
這一方法既利用了期望用戶的擴(kuò)頻碼信息,又充分利用了各用戶信息間的獨(dú)立性。 - Synchronization technique of spread spectrum code is utilized in two stages . multipath searcher coarsely estimates the pn code phase and code tracking confirm the pn code phase precisely
這需要采用擴(kuò)頻系統(tǒng)中擴(kuò)頻碼同步技術(shù),即:多徑搜索粗略地估計(jì)pn碼相位,同步跟蹤精確確定pn碼相位。 - In cdma communication system, the users are identified by their different spread spectrum codes which are unique to each user, namely they are identified by the cross correlation of spread spectrum codes
在cdma系統(tǒng)中各用戶是根據(jù)地址擴(kuò)頻碼的不同，即根據(jù)它們之間互相關(guān)特性來區(qū)分的。 - In cdma communication system, the users are identified by their different spread spectrum codes which are unique to each user, namely they are identified by the cross correlation of spread spectrum codes
在cdma系統(tǒng)中各用戶是根據(jù)地址擴(kuò)頻碼的不同，即根據(jù)它們之間互相關(guān)特性來區(qū)分的。 - Therefore the capability of spread spectrum code is the key to the capability of area navigation system . in this thesis parallel phase-shifting sequence as spread spectrum code is given, which has better capability
所以擴(kuò)頻碼的相關(guān)性能直接關(guān)系到系統(tǒng)的通信性能,本文提出用m序列移位序列作擴(kuò)頻地址碼,具有更好的性能。 - Therefore the capability of spread spectrum code is the key to the capability of area navigation system . in this thesis parallel phase-shifting sequence as spread spectrum code is given, which has better capability
所以擴(kuò)頻碼的相關(guān)性能直接關(guān)系到系統(tǒng)的通信性能,本文提出用m序列移位序列作擴(kuò)頻地址碼,具有更好的性能。 - It's difficult to see spread spectrum code in a sentence. 用spread spectrum code造句挺難的
- The manner of modulation, the spread spectrum codes, and the manner of the acquisition and tracking are discussed . barker codes, dpsk and match filter with the ability of rapid acquisition are concluded as the appropriate manner for cdma missile controlling and guiding
對擴(kuò)頻碼、調(diào)制解調(diào)方式、捕獲與跟蹤方式進(jìn)行討論，得出barker碼、dpsk、匹配濾波器快速捕獲是適合便攜式反坦克導(dǎo)彈cdma無線制導(dǎo)的相應(yīng)工作方式。 - spread spectrum code division multiple access technique ( ss-cdma ) has successfully been applied in the second generation mobile communication system, such as is-95 . moreover, the main technique of the third generation mobile communication system is also based on cdma
擴(kuò)頻碼分多址已成功地應(yīng)用于第二代移動通信中，如is-95，而且第三代移動通信的主要方案也都是基于碼分多址cdma，因此cdma技術(shù)具有無可爭辯的競爭力。 - Finally, according to the configuration of network, spread spectrum codes and fbgs based encoder / decoder for ocdma system, the mathematical models for ds, fe, fm and ds / fh versions of ocdma system are investigated respectively . then, the system is simulated and analyzed
最后，根據(jù)ocdma系統(tǒng)的網(wǎng)絡(luò)結(jié)構(gòu)、擴(kuò)頻碼和fbg編解碼器，得出了ds、fe、fh以及dsfh等ocdma系統(tǒng)的數(shù)學(xué)模型，并據(jù)此對多用戶干擾受限的上述ocdma系統(tǒng)進(jìn)行了信號仿真和性能分析。 - Based on the analyzing, concluding and summarizing the publications concerned, my dissertation mainly focuses on three aspects of the ocdma system with fiber bragg gratings ( fbgs ) based encoder / decoder, namely, spread spectrum codes, fbgs based encoder / decoder and performance evaluation
通過分析、歸納和總結(jié)大量的國內(nèi)外文獻(xiàn)，本文從擴(kuò)頻碼、光纖布拉格光柵(fbg)編解碼器和性能分析等三個方面就“基于fbg編解碼器的ocdma系統(tǒng)”展開了大量的研究工作。 - This thesis investigates the application and implementation of adaptive array based on mmse criteria in the presence of strong man-made interferences and aperiodic spread spectrum codes, including reference signal generating, afc in adaptive antennas array, and an application of adaptive antennas for a general non-spread spectrum signal, ssb ( single sideband ) communication system is presented . the thesis is outlined as follows
論文研究了在強(qiáng)人為干擾和非周期擴(kuò)頻碼情況下，基于mmse準(zhǔn)則的擴(kuò)頻系統(tǒng)自適應(yīng)天線陣的實(shí)現(xiàn)和應(yīng)用問題，包括參考信號提取、自適應(yīng)天線陣中的afc，并給出了在非擴(kuò)頻信號單邊帶ssb(singlesideband)信號通信系統(tǒng)中的自適應(yīng)天線的應(yīng)用。 - The method was correlate search and fft carrier detection, which could solve the problem of the capture of the spread spectrum code under the condition of low snr and big frequency offset . we also put forward a method, shift receiving window and correlate with local sequence, which not only could solve the problem of symbol synchronization but also could acquire the statistics of the multipath . then we utilized the results of the channel estimation and the technology of rake receiver to decode the received spread spectrum sequence and acquire rude information
方案中提出了：相關(guān)搜索、fft檢測信號載波的方法，解決了低信噪比、大頻差條件下擴(kuò)頻碼的同步捕獲難題；滑動相關(guān)完成位同步的方法，解決了低信噪比下的同步問題；在時域利用相關(guān)進(jìn)行信道估計(jì)，然后利用rake接收技術(shù)完成相關(guān)解擴(kuò)的方法，一定程度上解決了多徑衰落影響解擴(kuò)性能的問題。 - To realize the object of this research, we must solve some problems better such as the relationship between the spread spectrum processing gain and system complexity, the choice of spread spectrum codes etc . all these problems can be solved by existing theories and techniques and need not establish new system info, so this technique scheme is feasible
實(shí)現(xiàn)本研究的目標(biāo)，需要解決好處理增益與系統(tǒng)復(fù)雜性的關(guān)系，擴(kuò)頻碼的選擇等問題。這些問題都可通過應(yīng)用現(xiàn)有的相關(guān)基本理論和技術(shù)進(jìn)行解決，不需要建立新的理論體系，因此本技術(shù)方案是可行的。 - In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly . multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers . by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable
在wcdma系統(tǒng)中,為正確解擴(kuò)解調(diào)接收到的擴(kuò)頻信號,接收機(jī)本地產(chǎn)生的擴(kuò)頻碼(pn碼)相位必須和接收信號中的擴(kuò)頻碼相位完全同步;同時移動通信環(huán)境中的傳輸信號由于接收機(jī)和發(fā)射機(jī)之間的直達(dá)路徑有可能被建筑物或其他障礙物所阻礙,總是經(jīng)過折射或反射的多條路徑后才到達(dá)接收機(jī),從而產(chǎn)生多徑信道。 - If the correlation of different spread spectrum codes is not zero, there would be multi-access interference . additionally, cdma communication system is a interference-limited system, that is to say that the interference directly influences the capacity of this system and the qos of the user in the system . in order to rid the multi-access interference, multi-user detection ( mud ) plays a important role
若用戶間的互相關(guān)不為零，則會導(dǎo)致多址干擾的產(chǎn)生；另一方面，由于cdma系統(tǒng)是干擾受限的系統(tǒng)，即干擾程度直接影響到系統(tǒng)軟容量和系統(tǒng)內(nèi)用戶服務(wù)質(zhì)量的高低，為了有效地克服多址干擾的影響，多用戶檢測(mud:multi-userdetection)技術(shù)的使用就顯得尤其重要。 - spread spectrum code emitted by navigation station has correlative operation with the signal produced by receiver, through measuring the place of maximal correlative function, we can measure the spreading time of the navigation station ’ s signal, so we can measure the distance between navigation station and receiver
區(qū)域?qū)Ш嚼脤?dǎo)航臺發(fā)射的擴(kuò)頻碼與接收機(jī)產(chǎn)生的本地信號進(jìn)行相關(guān)運(yùn)算,通過測量相關(guān)函數(shù)最大值的位置,來測定導(dǎo)航臺信號傳播時間,從而測定導(dǎo)航臺到接收機(jī)的距離。
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