signal spreading 中文意思是什麼
signal spreading
解釋
信號擴展-
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。 -
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。 -
Diversity receiving technique for synchronous time spreading signal in time - varying fading channels
時變衰落通道中同步時間擴展信號的分集接收技術 -
The optical channel models for airborne submarine laser communication are built. the multipath time spreading of signal pulse is studied. the waveform of received signals in receiver in submarine laser communication system is analyzed and simulated
通過蒙特卡羅方法的模擬研究，建立了機載激光對潛通信的光脈沖傳輸模型，研究了信號光脈沖的時間擴展，分析並模擬了接收面上的接收波形。 -
This implies that the cross correlation between the spreading sequence of the user of interest and the signal from a strong interfere can be larger than the correlation with the signal from the desired user
深入分析自然免疫現象的內在動因，優化和完善現有演算法的模型與結構體系，拓展應用領域將是我們下一步研究的重點和努力的方向。 -
It is particulary suited to multirate signal transmission due to the use of an offset stacked spreading modulation scheme, which simplifies th ' e rate - matching algorithm relevant to multimedia services and facilitates asymmetric traffic in up - and downlink transmissions for ip - based applications
通過調整偏移棧，偏移的大小，可簡化多媒體服務的速率匹配演算法，特別適用於ip網路中上行鏈路和下行鏈路非對稱業務的傳送。 -
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。 -
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。 -
Moreover, our 3 - tier alert system will becomes an easily identifiable signal to our customers to prevent unnecessary rumours from spreading in the properties. " as a matter of fact, we have already launched our
，使到客戶能夠提高警剔，並了解到富城為他們所制定的預防措施，避免造成任何不必要的資訊謬誤或恐慌。 -
Supposing chaotic ds - spread spectrum signal bandwidth is equal to the fh slot spacing, the bit error rate formula is derived, and its performance is evaluated and simulated assuming the worst case of jamming strategy. the results show that, in some cases, the addition of chaotic ds spreading to fh system, without increasing total system bandwidth, can improve significantly the system ' s resistance to partial band multitone jamming
對最惡劣條件下系統的抗干擾性能進行了模擬研究，結果表明，在某些情況下，在慢跳頻系統中，加入混飩直擴成分，即使不增加系統帶寬也能有效地改善系統對抗部分頻帶多頻干擾的能力。 -
Chaotic switching signal obtained from chua ' s circuit was used to control buck dc / dc converter. by compared the power spectrum of input current between chaotic modulations and classical pwm, it demonstrate that chaotic switching modulations have good effect on spreading power spectrum, which can be used to reduce the level of emi and to improve emc of smps
通過對四種混沌調制模式下變換器輸入電流與周期pwm模式下輸入電流頻譜的分析比較表明，混沌調制技術在擴展頻譜方面有良好的效果，可以用於降低開關模式電源的電磁干擾（ emi ）水平，改善電磁兼容性（ emc ） 。 -
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 -
The two calibration projects are both based on de - spreading the reference signal. because they require a prior knowledge of the auxiliary signal, such as pn spread code, doa, constant modulus and so on, the fast and robust convergence can be ensured, and the multiple - access interference ( mai ) can be eliminated
由於利用了輔助信號源的先驗知識，如擴頻碼、輔助信號的doa 、比特信息及恆模特性等，有源校正技術不僅克服了自校正技術收斂慢的弱點，還消除了不利於校正的多徑影響。 -
And the spreading modulation, radiation signal modulation and choosing of waveform parameters are also discussed, which is the base of the receiver designing
同時對擴頻調制方式、射頻信號調制方式以及波形參量的選擇進行了重點的論述，並對擴頻通信系統的相關指標進行了計算。
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