cyclic correlation 中文意思是什麼

cyclic correlation 解釋
循環相關
  • cyclic : adj. 1. 周期的；輪轉的，循環的。2. 【化學】環狀的；【植物；植物學】輪列的，輪卷的。3. 組詩的；故事始末的。
  • correlation : n. 相互關系，相關（性）；對比；交互作用；【數學】對射，異射。 correlation index 關聯指數。 correlation mineral 對比礦物。
  1. Cycle frequency - based blind beamforming shows the performance degradation due to cfe ( cyclic frequency error ). an improved algorithm is presented in literature 6, which adopting forgetting factor in estimation cyclic correlation matrix would largely depress the sensitivity of cab to cyclic frequency error. by using this method, the improved algorithms of the c - cab and ecab algorithms are presented in this dissertation

    針對基於循環頻率的盲波束形成演算法對循環頻率誤差cfe （ cyclicfrequencyerror ）很敏感而導致演算法性能下降的情況，參照文獻[ 6 ]提出的遺忘因子cab演算法，提出了c - cab演算法以及基於特徵空間的盲波束形成演算法（ ecab ）的改進演算法。
  2. In this paper, the radiolocation technique and principium of ofdm in the cell - communication system were introduced firstly, and sensitivity of ofdm system to synchronization was analyzed. then, two methods of timing synchronization based on the cyclic prefix and pilot sequence were introduced, and a novel timing synchronization method based on pilot sequence was presented, which provided a correlation peak with pulse shape

    由於ofdm系統中的定時同步要求和無線定位中的測時測距在本質上是一致的，所以本文緊接著分析了基於循環前綴和導頻序列的兩種定時同步方法，並提出了一種新的基於導頻序列的具有脈沖形狀相關峰的定時同步方法。
  3. Two detection methods of chirp signals are presented in the dissertation : the cyclic autocorrelation detection method and the correlation detection method of cyclic autocorrelation function. it is shown that the two methods both have an excellent performance of blind detection. the performance analyses of the two detection methods are both carried out for additive noise or multiplicative noise, and the output signal - to - noise ratio ( snr ) expressions of the two methods are also derived

    通過研究提出了兩種線性調頻信號的檢測方法?基於循環自相關函數包絡的檢測方法和基於循環自相關函數的相關函數包絡的檢測方法，兩種方法均可實現信號的盲檢測，有良好的檢測性能，文中還分析了加性噪聲及存在乘性和加性噪聲情況下兩種檢測方法的性能，推導出了輸出信噪比公式。
  4. In this paper, a variety of familiar signals and channels are firstly analyzed and then the methods of dft and cyclic correlation are introduced

    本文在分析各種常見的通信信號和通道的基礎上，採用了離散傅立葉變換和循環相關方法解決信號載頻偏差的高精度估計問題。
  5. Ds signal is twice modulated with the rapid pseudorandom noise sequence and the carrier. so it appears cyclostationary. in the field of spectral correlation, ds signals appears its characteristic as fallows : for the amplitude of spectral correlation, the information of carrier frequency and pn code rate are contained on the spectrum frequency equal to zero sheet, and also the pn code rate is contained on the sheet of spectrum frequency equal to carrier frequency ; for the phase of spectral correlation, the information of carrier initial phase is contained on the sheet of cyclic frequency equal to double carrier frequency

    Ds信號是經過高速偽隨機序列和正弦載波二次調制的寬帶信號，因此具有周期平穩特性，它在譜相關域表現為:幅頻特性在譜頻率等於零截面切片上包含了載頻和偽碼速率信息特徵，在譜頻率等於載頻截面切片上包含了偽碼速率信息特徵;相頻特性在循環頻率等於兩倍載頻截面切片上包含了載波初相信息特徵。
  6. Secondly, the dissertation proposes a novel blind symbol - timing scheme for ofdm systems based on cyclostationarity feature of received symbols. the proposed schemes also exploits the periodicity of ofdm symbol introduced by cyclic prefix, by applying 2 - dimentional fourier transformation and choosing the appropriate correlation peak value as the symbol start location, the precision of this scheme is higher than previous conventional method. thirdly, the dissertation presents analysis with regard to channel estimation of ofdm systems. several interpolation algorithm in ofdm systems which based on pilot sequence have been analyzed in the first instance, and the influence of the channel noise on interpolation precision has discussed. the theoretic analysis and simulation results show that : the interpolation error induced by the precision of interpolation procedure itself has out weight

    第三，論文在ofdm系統的通道估計方面，先對基於導頻的ofdm通道估計中的多種插值方法進行了分析，討論了噪聲對插值精度的影響，指出插值本身的精度所造成的插值誤差遠大於噪聲所帶來的插值誤差，從而階次更高的插值演算法在實用中並非最優的;並指出插值濾波法比變采樣率演算法對噪聲的影響更為敏感，在信噪比較高時插值濾波演算法比變采樣率演算法更優。
  7. Several methods of sequence spread spectrum signals direction have been developed, such as energy detection, correlation detection, cepstrum detection, cyclic spectral, higher order cumulant detection, etc. these methods developed from the research of detection and estimation for ds signals

    直擴通信信號檢測的研究已發展出許多方法，如能量法、相關法、倒譜法、周期譜法及高階譜法等。
  8. In this paper, the detection and parameter estimation, are studied for ds - ss / bpsk signal with low signal - to - noise ratio, including square detection, cyclic spectrum detection, correlation detection and higher - order statistics - based detection

    本文研究了包括平方倍頻檢測、周期譜檢測、時域相關檢測和高階統計量檢測四種針對低信噪比下ds - ss / bpsk信號的檢測與參數估計方法。
  9. Dft method can be fast implemented on dsp platform by the use of fft algorithm, while the method of cyclic correlation has better noise immunity performance and high estimation accuracy

    離散傅立葉變換方法能夠在dsp平臺上通過fft快速實現，而循環相關方法則具有很高的頻率估計精度和很好的抗噪性能。
  10. In the dissertation, two kinds of computationally efficient algorithms ( including ssca and fam ) for cyclic spectral analysises have been discussed detailly and deeply after introduce of the theory of spectral correlation, in addition, digital implementations of the corresponding algoritms architecture and the comparision of computational complexity are presented

    本文在簡要介紹了循環譜理論的基礎上，對兩種高效循環譜密度函數的計算方法（分段譜相關函數演算法（ ssca ） 、 fft累加演算法（ fam ） ）進行了詳細而深入的討論，給出了兩種演算法結構的數字實現，比較了各種方法的運算復雜度。
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