ratio estimation 中文意思是什麼

ratio estimation 解釋
比率估計
  • ratio : n. （pl. ratios）1. 比，比率，比值；比例；系數。2. 【經濟學】復本位制中金銀的法定比價。vt. 1. 用比例方式表達；求出…的比值；使…成比例。2. 將（相片）按比例放大或縮小。
  • estimation : n. 1. 估計，評價。2. 預算，預算額；概算。3. 尊重，尊敬。4. 意見，判斷。5. 【化學】估定；測定。
  1. And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results

    接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。
  2. Methods of estimating baud rate, signal to noise ratio ( snr ) and reference phase are investigated. a modified euclidean algorithm is proposed to estimate baud rate of the burst packets. a cumulant based algorithm of estimating snr of star - qam is proposed which has better estimation performance in medium scope of snr

    研究了自適應調制中波特率，信噪比和載波相位等參數的估計演算法；提出一種基於修改的歐幾里得演算法的波特率估計演算法，這種演算法可以對突發分組的波特率做出準確估計；提出一種星型qam信號的信噪比估計演算法，在中等信噪比條件下，具有較好估計性能。
  3. Due to the needs for the flat spectrum character, the leading sequence requires high self - correlation. the author selected a series of sequences whose highest peek to second highest peek ratio is big, from a series of " m " sequences. then, the optimized leading sequences were judged according to glf, the sequences which have lower glf would be more proper for the estimation

    首先，作者提出搜索的標準，根據前導序列要有平坦的譜特性，從而要有好的自相關性，從一種m序列中找出最大峰與次大峰比例較大的一些序列，然後根據增益損耗因子來判決最佳前導序列，增益損耗因子越小的序列越適于估計。
  4. Secondly, the paper researches blind estimation of signals parameters, including the carrier frequency, signal to noise ratio and symbol rate of digital modulations. thirdly, with the combination of parameters from early studies on the decision theory, a set of robust feature parameters are extracted from signal power spectrum and the power spectrum of the second and fourth power of signal. based on these parameters, the proposed scheme is able to recognize 12 types of common used modulations, namely ask 、 2fsk 、 msk 、 4fsk 、 psk 、 qpsk 、 / 4qpsk 、 8psk 、 am 、 dsb 、 ssb 、 fm

    接著，對信號功率譜、平方譜及四次方譜進行研究，針對通信中常用的調制方式，結合前人提出的基於決策理論中的特徵參數，設計了一組對信噪比和信號調制參數不敏感的分類特徵參數，利用上述參數完成了一種基於信號頻域的識別方法，可以對ask 、 2fsk 、 msk 、 4fsk 、 psk 、 qpsk 、 / 4qpsk 、 8psk 、 am 、 dsb 、 ssb和fm這12種常用調制方式進行識別。
  5. In the view of valuation practice, the author discusses how to apply dcf models for valuation of non - listed companies more effectively. this paper especially probes into two problems in the valuation of non - listed companies in china, one is to measure the discount ratio of the expecting cash flows, and the other is the estimation of valuation discount for the lack of marketability

    本文主要是從評估實踐的角度，探討如何更有效地運用貼現現金流模型對非上市公司的股權價值進行評估，重點討論了我國非上市公司股權價值評估中貼現率及股權缺乏流動性的價格折扣的估算。
  6. To certain monitoring area and the remote sensing ratio wave bands defined, by means of the criterion of mean residual sum of squares to carry on filtering of remote sensing factors, finally the important remote sensing wave bands influencing canopy density estimation are confirmed, meanwhile the operable software system is programmed

    針對特定監測區域，對設置的遙感比值波段，採用平均殘差平方和準則進行篩選，最終確定對郁閉度估測有一定影響的遙感波段，並形成可操作的軟體系統。
  7. According to the information that reflected the condition of channel, this thesis classified acm into heuristic acm and snr - estimation acm. the system that using the first one of acm decide the scheme of modulation and coding according to the frame error ratio that reflected indirectly the condition of channel, while it using the another of acm decide the scheme according to the snr estimation

    根據反映通道狀態的信息不同，本文將自適應編碼調制技術分為基於探索的自適應編碼調制技術和基於通道信噪比預測的自適應編碼調制技術，前者根據間接反映通道條件的誤幀率和重傳次數信息來決定編碼調制方式，而後者根據通道信噪比預測的結果調節編碼調制方案。
  8. A new cumulant based algorithm of estimating signal to noise ratio ( snr ) and reference phase is proposed for likelihood ratio classification of mpsk signals, which is blind to unknown phase order of mpsk signals. the asymptotic statistic distribution characteristics of cumulant function estimation of mpsk signals are given

    針對mpsk信號似然比分類中的參數估計問題，提出了在未知調制類型的前提下，基於累量分析的（對調制類型）盲的信噪比和參考相位估計演算法，並理論分析了累量函數估計值的漸進統計分佈特性。
  9. The ball mill load - control apparatus adopted the assembly language and the c51 language to program and its concerned software was designed, including the data collection, the wave - percolation, the short - time average over - zero ratio, the estimation of the power chart and the average - period chart

    磨機負荷控制儀軟體使用匯編和c51編程，本文進行了相關軟體的設計，包括數據採集、濾波、短時平均過零率、功率譜估計和平均周期圖等。
  10. In this paper, according to the theory of signal detection and estimation, the optimal receiver pattern of pn code signal is introduced and theoretically, the relation curve of the probability of the correct detection with the input s / n ratio under the different probabilities of false alarm is illuminated

    根據信號的檢測和估計理論，文中分析了數字相關器實現偽碼信號接收的最佳模型，從理論上計算了在不同的虛警概率下，檢測概率隨輸入信噪比的變化曲線，並分析了doppler效應對偽碼相關接收的影響。
  11. Frequency - domain equalization. at the same time discusses some key problems in ofdm : high ratio of peak - to - average power of output signals, problem of synchronization, channel estimation, adaptive bit, power and subcarrier allocation. emphasize on channel estimation, and present a new algorithm which can filtering more interpolation errors and noise. for the sake of improve the performance of resist narrowband noise and make efficient use of the spectrum apply malvar wavelet division

    同時就ofdm系統中的一些關鍵問題如峰值平均功率比（ papr ）太高，同步問題，通道估計，通道、比特與功率必須動態分配進行了研究，著重研究了通道估計問題並提出一種改進的方法，能濾除更多的噪聲分量和插值誤差，提高系統的性能；為了提高抗窄帶噪聲的性能和提高通道利用率，用malvar小波變換實現了不等帶寬分配。
  12. Based on ica post processing matched filter multi - user detection lets the output of traditional matched filter to initialize the ica iterations, not only the known spread information of interesting user is used to overcome the uncertainness of ica, but also the character of statistical independence is used. the simulation results show that it advances the ability of traditional detector when the signal - noise - ratio is large. keywords code division multiple access ; independent component analysis ; channel estimation ; matched filter ; blind multi - user detection

    基於ica后處理的匹配濾波多用戶檢測是用傳統的檢測器的輸出來初始化ica的迭代，它不但充分利用多用戶信號的已知信息，克服了ica的不確定性問題，同時也充分利用了多用戶信號的統計獨立性，模擬實驗結果證明這種多用戶檢測演算法在高信噪的情況下，誤碼性能改善隨著信噪比的提高不斷增加。
  13. The present paper deals with the asymptotic properties of estimation and likelihood ratio test for - two exponential populations with partially missing data

    摘要討論部分缺失數據兩指數總體的參數估計和關于總體相同的似然比檢驗。
  14. ( 5 ) based on subspace orthogonal algorithm, a method for estimating the parameters of wide - band chirp signal is studied. it is shown that accurate estimation can be obtained for wide - band chirp signal even under low signal - to - noise ratio ( snr )

    （ 6 ）基於dft原理和fft技術，提出了適用於非高斯噪聲環境的線性調頻參數估計的快速離散chirp傅立葉變換（ dcft ）演算法。
  15. The maximum likelihood estimator ( mle ) approach is an important one in frequency estimation domain. this approach has the merit such as exhibiting best performance and requiring minimum threshold of signal noise ratio in calculation

    最大似然頻率估計法是該領域中的一種重要的研究方法；該方法具有估計結果準確，計算所要求的信噪比門限值低等特點。
  16. Screened - ratio - principle - based doa estimation algorithm in impulsive noise environment

    信號到達角的快速估計演算法研究
  17. A new diamond search algorithm for fast - matching motion estimation is proposed to replace the traditional three - step search algorithm in the motion estimation region. experiments results demonstrate that the application on the new diamond search algorithm optimized by mmx has magnificently improved the efficiency of compression ratio and computing speed

    實驗結果證明，經演算法改進和mmx技術優化的新鉆石搜索法遠勝於三步搜索法，大大提高了程序運行的效率，使系統達到了軟體實時編解碼的需要。
  18. Based on the obtained lower bounds on mean squared channel estimation errors, the limits on bit error rate ( ber ) for maximal ratio combining ( mrc ) with gaussian distributed weighting errors on independent and identically distributed ( i. i. d ) fading channels are presented

    通過對不同衰落通道多普勒譜的積分，求出了相應的通道估計均方誤差下界的閉合表達式，並在此基礎上得到了分集系統在獨立同分佈的衰落通道中採用最大比合併時的誤碼率下界。
  19. Starting from benchmark model of incentive mechanism, the paper discussed the statistical backgrounds of first order condition and likelihood ratio condition, the information meaning of sufficient statistics and its derivation in relative performance evaluation, and the improvement on incentive allocation by large sample theory and bayes estimation under multi - period

    從激勵機制的基準模型出發，探討一階條件法與似然比條件的統計背景、充分統計量的信息含義及其在比較業績評價方面的推廣應用、多期情形下大樣本理論與貝葉斯估計對激勵配置的改善。
  20. Base on the simu1ation model of signal and correlated noise model, the performance of different method is compared under different signal to noise ratio ( snr ). 6. the performance of differcni time delay estimation method is evaluated based on the analysis of real data

    通過模擬數據對同一信噪比不同延估計方法性能進行比較，對不同信噪比下每種時延估計方法的性能進行比較，尤其在噪聲不同相關性下對不同時延估計方法的性能進行比較，得到各種時延估計方法在模擬條件下的性能差異。
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