spreading code 中文意思是什麼
spreading code
解釋
擴展代碼-
Joint angle and delay estimation based on uniform circular array in cdma system with aperiodic spreading code
非周期擴頻系統中基於均勻圓陣的角度和時延的聯合估計 -
In order to support multi - rate transmission in ds - cdma, many cdma techniques such as multi - code ( mc ) scheme, orthogonal variable spreading factor ( ovsf ) and variable modulation have been used
在ds - cdma系統中多速率傳輸的方法有很多種，例如多碼方案（ mc - cdma ） ，正交可變擴頻增益方案（ ovsf ）和多調制方案等。 -
This paper focuses on the blind code synchronization approach and spreading sequences estimation algorithm. the main results can be summarized as follows : 1. both synchronous and asynchronous dsss / bpsk baseband signal models are established
本文重點是對盲碼同步和擴頻碼序列估計的研究，主要的工作成果如下: 1 、分同步和非同步兩種情況建立了dsss / bpsk基帶信號模型，並介紹了二種非合作式擴頻碼序列估計和解擴的方案。 -
After establishing the model of intermediate frequency direct sequence spreading spectrum ( if dsss ) receiver, comparing and analyzing several conventional code acquisition methods, code and carrier two - dimension fast acquisition scheme based on two - dimension fft is proposed. finally, the situation for two targets is analyzed
首先在建立了中頻直擴接收機的模型之後，本文對常用的偽碼捕獲方法進行了詳細地分析和比較，然後提出了本文的基於二維傅立葉變換技術的快速捕獲方法，並且分析了兩個目標時的情況。 -
In order to meet the needs of dsss signal reconnaissance, a method of dispreading without the code is brought forward by this paper ， in which the local code is gained from the dsss signal. so we can intercept dsss signal with low snr even if the spreading code is unknown. liu jie ( communication and information system ) directed by prof. gao huisheng
為適應電子戰中對直擴信號偵察的需要，本文提出一種了無碼解擴的方案，採用從直擴信號中獲得本地參考信號的方法，可以在沒有擴頻碼的情況下，截獲低信噪比直擴信號的通信信息。 -
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疾病名稱、疾病名稱（英文） 、拼音、別名、西醫疾病分類代碼、中醫疾病分類代碼、西醫病名定義、中醫釋名、西醫病因、中醫病因、季節、地區、人群、強度與傳播、發病率、發病機理、病理、病理生理、中醫病機、中醫診斷標準、中醫診斷、西醫診斷標準、西醫診斷依據、發病、病史、癥狀、體征、體檢、電診斷、影像診斷、實驗室診斷、血液、尿、糞便、腦脊液、其他診斷、免疫學、組織學檢驗、西醫鑒別診斷、中醫類證鑒別、療效評定標準、預后、並發癥、西醫治療、中醫治療、中藥、針灸、推拿按摩、中西醫結合治療、護理、康復、預防、歷史考證。 -
Secondly, we propose a multi - user detection based on kurtosis. this method can suppress not only mai ( multiple - access interference ) but also isi ( inter - symbol interference ). all needs in the detection are only the desire user ' s spreading code
並在此基礎上，提出了一種基於峭度的盲檢測方法，這種方法不但可以抑制多址干擾mai （ multiple - accessinterference ） ，還可以抑制符號間干擾isi （ inter - symbolinterference ） ，而且在檢測時只需要期望用戶的擴頻碼信息，是一種全盲檢測方法。 -
In this thesis, first, we present the theory of sess system, the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system. an efficient acquisition scheme based on periodically transmitting the synchronization head, which is composed of binary chaotic codes, using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present. the acquisition model of sess system is built and simulated in the awgn channel, the raleigh fading channel and imulti - address interfere condition
本文首先概述了自編碼擴頻通信的原理、自編碼擴頻序列的產生方法及其特性和擴頻通信系統編碼同步的理論，然後針對自編碼擴頻通信系統提出了擴頻序列捕獲方案:周期性地加入混沌序列同步碼，並採用恆虛警率匹配濾波器捕獲法;在加性白高斯噪聲通道、瑞利衰落通道和多址干擾情況下進行了模擬，分析了各種捕獲性能:在選擇性能最優的混沌序列、適當的序列長度、虛警概率及門限值的情況下，可以獲得較短的捕獲時間和較大的捕獲概率。 -
After that, it discusses the capture and tailing method for the false random code spreading code, including correlation and non - correlation method. between the two method, the correlation method is fit for the wireless communication
接下來討論了偽隨機擴頻碼的捕獲和跟蹤方法，包括相干的方法和非相干的方法，其中非相干的方法更適合用於無線通信中。 -
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
區域導航利用導航臺發射的擴頻碼與接收機產生的本地信號進行相關運算，通過測量相關函數最大值的位置，來測定導航臺信號傳播時間，從而測定導航臺到接收機的距離。 -
In code - division multiple - access ( cdma ) systems, the auto - and cross - correlation properties of the spreading sequences employed play an important role on the level of the self - interference ( si ), multiple access interference ( mai ) and adjacent cell interference ( aci ), and therefore directly influence the performance and capacity of the systems
在碼分多址（ cdma ）系統中，擴頻序列自相關和互相關特性的好壞在很大程度上決定了系統自干擾（ si ） 、多址接入干擾（ mai ）和鄰區干擾（ aci ）的大小，從而直接影響著系統性能優劣和容量大小。 -
The data recovery at the receiver requires the spreading codes. in sess system, the receiver doesn ’ t know which spreading code will be used, so first it must de - spread the received signal correctly to regenerate the spreading code
自編碼擴頻系統的擴頻序列是接收端事先未知的，不能用事先設計的本地擴頻序列產生器產生，需要由恢復的數據獲得。 -
The spreading code is acquired from the transmission data source. as a result, the method to generate the spread codes is very important. and the method determines the practical application of sess communication system
自編碼擴頻通信的擴頻序列是從待傳輸的信源數據流中獲得的，因此信源的隨機化技術是自編碼擴頻通信的基礎，它在很大程度上決定了自編碼擴頻通信是否能獲得實際應用。 -
Hrb400 steel bars, the 400 mpa hot rolled steel bar, which is called new grade iii steel bar, has been taken as the one of 10 new technical spreading the application mainly, listed in revised newly code, so spread application as leading steel bar in reinforced concrete structure. in 1998, it ' s pointed new grade iii steel bar is a new type building steel used specially in building structure
Hrb400級鋼筋（熱軋帶肋新級鋼筋）已作為高效鋼筋被列為重點推廣應用的建築業10項新技術之一，早在1998年建設部就明確提出： 「新級鋼筋是專門為建築結構應用開發的新型鋼筋，該鋼種已列入新修訂的國家規范標準，應大力推廣使之成為我國鋼筋混凝土結構的主導鋼筋」 （建設部建[ 1998 ] 200號文） 。 -
When we carry through the theoretic analysis, according to the request of cdma communication system for spreading code, we analyze the characteristics of chaotic spreading sequence
在進行理論分析時，根據碼分多址通信系統對擴頻碼的要求，分析了混沌數字擴頻序列的特性。 -
In the code division multiple access ( cdma ) system, the multiple access interference ( mai ) mitigation capability as well as system capacity are determined, to a great extent, by the correlation properties of spreading sequences ; while adaptive modulation and coding ( amc ) with high spectral efficiency is the key technique to obtain high speed and low symbol error rate ( ser ) performance in mobile data transmission
在碼分多址（ cdma ）系統中，擴頻序列的特性在很大程度上決定了抗多址干擾（ mai ）能力和系統容量，而高頻譜效率的自適應調制編碼（ amc ）技術則是獲得高速率和低誤碼率（ ser ）移動數據傳輸性能的關鍵因素。 -
Based on the single cycle detector, the finite cycle detector is proposed for the detection of phase - coded signals. the finite cycle detector has a good performance under unknown the spreading code sequence, initial phase, spreading code timing epoch
針對相位編碼信號的檢測，提出了基於單循環檢測器的有限多循環檢測器，可在沒有編碼序列、初相、編碼序列初始時間等信息的情況下，取得理想的檢測效果。 -
The problem of signal processing for direct - sequence code - division - multiple - access ( ds - cdma ) signal over multipath frequency - selective mobile channels is considered. a new blind receiver is proposed. without the knowledge of the multiple - access interference users spreading code and the channel characteristics, the receiver achieves blind detection with prior knowledge of only the desired users spreading code and approximate timing. by using reduced rank adaptive decorrelating filter and adaptive multipath combiner which is based on decision - directed algorithm, the receiver gets the ability to combat both fading and the near - far effect at low cost. simulation results demonstrate that the proposed receiver offers high performance
本文研究多徑頻率選擇性衰落通道下直接序列擴頻碼分多址（ ds - cdma ）信號的處理問題，提出了一種新型的盲接收機.該接收機不需預知多址干擾用戶的擴頻碼，不需預知通道參數，只需已知期望用戶的擴頻碼和粗略的定時，就可以完成用戶的盲檢測.同時，該接收機通過降維自適應去相關濾波和基於判決指導的自適應多徑合併，來獲得低成本和良好的抗衰落、抗遠近效應性能.模擬結果驗證了本文提出的接收機的優良性能 -
With mc - cdma, each data modulated chip of the user specific spreading code is mapped onto a separate subcarrier after spreading and scrambling, so that the chips of the spreading code and, hence, the data symbol is transmitted in parallel on multiple subcarriers
Mc - cdma是將多載波技術應用於cdma中，兼具cdma和ofdm這兩種技術的特點。在mc - cdma中，用戶的信息符號先經過擴頻、加擾，再將擴頻序列的碼片并行地在多個子載波上傳輸。 -
This dissertation researches on wavelet theory applied to information transmission, including cdma spreading code design, waveform coding in digital modulation, over - saturated multi - access communication, diversity techniques for multi - path fading channels, and peak - to - average power ratio ( papr ) reducing methods for the wavelet packet modulation signals, etc.
本文以子波理論為工具，較深入地研究了通道傳輸方面的幾個問題，內容包括cdma擴展碼的設計、數字基帶波形成形技術、過飽和多址通信、克服衰落的分集技術和減小子波包調制信號的峰值功率/平均功率比值的方法等。
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