signature waveform 中文意思是什麼
signature waveform
解釋
特徵波形-
Traditional multiuser detector make good use of all signals which resuilt in multiple access interference so that it provides optimum mai resistance. ( 1 ) nevertheless, it assumes that the receiver can acquire the signature waveform and timing of desired user and the interfering users ; ( 2 ) it has no ability to suppress intercell multiple access interference ; ( 3 ) it cannot be applied in downlink channels. adaptive multiuser detector eliminates the need to know the signature waveforms and the timing of the interferes and has to need training data sequences for every active user
傳統多用戶檢測在單用戶檢測技術基礎上，充分利用造成多址干擾的所有用戶的信息進行聯合檢測，從而具有良好的抗多址干擾能力，但存在一些缺陷： （ 1 ）不僅要求知道期望用戶的地址pn碼及其定時信息，還要求其他干擾用戶的地址pn碼及其定時信息； （ 2 ）不能消除其他相鄰小區的多址干擾對本小區的影響； （ 3 ）不能直接應用在cdma移動通信系統中的下行鏈路。 -
But the frequent use of training sequence is certainly a waste of channel bandwidth. research shows that with the prior knowledge of only the signature waveform and timing of the user of interest, blind adaptive multiuser detector can effectively detect data symbol of the desired user without training data sequence for every active user
在傳統多用戶檢測技術基礎上，自適應多用戶檢測利用訓練序列在僅知道期望用戶地址pn碼及其定時信息條件下就可以進行檢測，不足的就是訓練序列佔用了額外的頻率資源。 -
In this paper, a new interference - space - based blind adaptive mmse linear detector and the corresponding tracking algorithm based interference correlation matrix is proposed for mai in cdma wireless celluar communication system. analysis and simulation illustrate that the proposed blind multiuser detector has lower computational complexity, faster convergence and stronger robust with respect to imprecise knowledge of the received signature waveform of user of interest
圍繞著cdma無線蜂窩移動通信系統中的多址干擾（ mai ）抵消問題，本論文在現有盲自適應多用戶檢測技術基礎上，提出了一種新的基於干擾空間線性mmse盲自適應多用戶檢測器及其相應的基於干擾自相關矩陣c _ 1跟蹤演算法。 -
Based on the uwb radar system, the emitting waveform design and signature waveform detection are discussed respectively in this paper to realize the detection and discrimination of targets
本文在超寬帶雷達體制下分別從發射波形設計和特徵波形檢測兩個角度來實現目標的檢測和識別。 -
In waveform design aspect the impulse response elimination method is presented to detect and discriminate the targets. in the signature waveform detection aspect the target ' s late - time response is adopted as the signature waveform, then the adaptive beam formation arithmetic is used to detect this signature waveform
在發射波形設計中提出了沖擊響應消去法，設計與目標匹配的發射波形來檢測和識別目標；在特徵波形檢測中提出用目標沖擊響應的晚期響應作為目標的特徵波形，再利用自適應波束形成的演算法來檢測待測目標的特徵波形。 -
A sorting method of the helicopter noise sources is given. the temporal waveform and spectrum of the noise signature is analyzed. at last, the sound pressure spectrum density level is estimated with the experimental data taken from a specific navy helicopter
扼要闡述了直升機噪聲的產生和分類，考察了直升機信號的波形和頻譜特徵，並對特定的直升機噪聲的聲壓譜密度級進行了計算。
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