symbol error 中文意思是什麼

symbol error 解釋
符號差錯
  • symbol : n. 1. 記號，符號。2. 象徵，表徵。3. 【宗教】信條。vt. ,vi. （-l（l）-） 〈罕用語〉＝symbolize.
  • error : n. 1. 錯誤；失錯。2. 謬見，誤想；誤信；誤解。3. 罪過。4. 【數學】誤差；【法律】誤審，違法；（棒球中的）錯打。adj. -less 無錯誤的，正確的。
  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. Symbol table management use for seeking table or filling table. error management looks for mistake

    符號表管理程序用於查表或填表，錯誤管理程序主要用於查錯。
  3. Space - time codes can be divided into tree mainly parts : bell layered space - time architecture ( blast ), space - time trellis codes ( sttc ) and space - time block codes ( stbc ). in this paper, we mainly compare the performance of blast and stbc in many aspects, such as design criterion, transmission rate, diversity gain, diversity combining, bit error rate and channel capacity etc. in this paper, we first respectively analysed the instantaneous received symbol energy - to - noise ratio of v _ blast in the diversity combining methods of maximal ratio combining ( mrc ), equal gain combing ( egc ) and selective combing ( sc )

    Mimo技術核心是空時編碼（ stc ） 。空時編碼主要分為三種:分層空時碼（ blast ） 、空時格碼（ sttc ）和空時塊碼（ stbc ） 。本文主要對分層空時碼和空時塊碼這兩種編碼方式在設計準則、傳輸速率、分集增益、接收合併、比特差錯率和通道容量等方面進行了較為詳盡的研究。
  4. By theory and practice simulation, the several types of constant envelope modulation techniques are analyzed and compared, including theirs modulation principle, phase path, the modulated wave envelope, power spectrums, error bit rate and the influence of its power spectrums of the band - limited and non - linear, etc. especially we have researched the ijf - oqpsk modulation technique, and the performance of its inter - symbol interference and time jitter free, and its strongly resisting of spectral spreading

    結合理論和實驗模擬結果，分析討論了衛星通信中的各種恆包絡調制技術，對它們的調制原理，相位路徑，已調波包絡，功率譜密度，誤碼性能，以及帶限非線性通道對其功率譜的影響等方面都作了研究和比較。特別研究了ijf ? oqpsk在消除碼間干擾和定時抖動方面的性能及其優良的旁瓣特性和抑制頻譜擴展特性。
  5. Semantic analyzing is the third part, and it introduces the semantic data structure i designed in detail, i. e., symbol form and the so - called key semantic data structure. also it introduces the way of error handling

    第三階段為語義處理階段，在這一階段詳細闡述了本文所設計的語義數據結構：符號表和核心語義數據結構，並對差錯處理的方法進行了介紹。
  6. An error symbol is displayed on the catalog application, indicating the presence of an error

    Catalog應用程序上將顯示一個錯誤符號，指示存在錯誤。
  7. According to the theorem about judging the number of error symbol concluded in this paper, an improved step - by - step decoding algorithm is put forward and proved, which based on some relative theorem promoted by t. - c. chen and shyue - win wei

    Chen和shyue - winwei提出的相關定理，結合本論文總結的判斷錯誤符號個數的定理，提出一種改進的step - by - step演算法，並且對相關的定理給出了證明。
  8. But conventional step - by - step decoding algorithm requires that every symbol of received word r ( x ) orderly adds to 2m - 1 nonzero elements of gf ( 2 ) to determine whether the weight of the error pattern has been reduced. if the weight of error pattern is reduced, the error location and the corresponding error value are found

    但是標準的step - by - step譯碼演算法將接收碼字中每個符號與伽羅華域gf （ 2 ~ m ）中的2 ~ m - 1個非零元素依次相加，判斷錯誤圖樣的重量是否下降，如果下降則說明找到了錯誤位置和相應的錯誤值。
  9. 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。
  10. Design a kind of sub - optimum digital prefilter. through the simulation of timing recovery loop which is n ' t added prefilter and which is added prefilter, discuss the convergence characteristic and compare the relation between timing jitter and signal to noise ratio, the relation between timing jitter and noise bandwidth of loop, the relation between symbol error ratio and signal to noise ratio

    通過對加預濾波器后的定時恢復環的模擬，討論了環路的收斂情況，比較了所設計的數字預濾波器和無預濾波器時環路定時抖動與信噪比、定時抖動與環路噪聲帶寬、誤碼率與信噪比的數量關系，證實所設計的數字預濾波器對減少定時抖動非常有效。
  11. For symbol synchronization, a filtering and squaring algorithm of estimating the timing error has been introduced, and a method to improve the accuracy of estimated data has been presented, then two signal interpolation filter have been analyzed, one is fir interpolation filter, another is cubic interpolation filter

    對于全數字接收機中符號定時誤差的恢復，先介紹了一種濾波平方后求符號定時誤差估值的演算法以及一種提高該演算法估值性能的改進方法，接著介紹了糾正定時誤差的fir插值濾波器和立方插值濾波器。
  12. Chapter three provides synchronization algorithms in dvb - t cofdm receiver, including symbol timing recovery, carrier frequency error estimation and sampling timing recovery. chapter four introduces some channel estimation algorithms based on interpolation in dvb - t receiver. five estimators are compared, in terms of mean - squared error both in rayleigh channel and ricean channel

    第三章首先討論了由於載波頻率偏差、符號定時偏差和采樣定時偏差對ofdm系統所造成的影響和干擾，然後針對dvb - t系統的cofdm接收機方案，分別給出了符號定時同步、頻率同步以及采樣鐘同步的實現演算法，並對它們的性能進行了分析模擬。
  13. Frequency - selective fading due to multipath propagation is a big obstacle in wireless communication. in the condition, the intersymbol interference ( isi ) comes into being and communication system appears error received symbol

    多徑傳輸效應引起的頻率選擇性衰落是無線通信的一大障礙，使接收信號產生碼間干擾（ isi ） ，導致通信系統出現誤碼。
  14. And it presents an estimation method for frequency difference by means of data synchronization selecting the time window of afc frequency difference estimation hi order to solve the problem that data symbol transition induces an enormous error of frequency difference estimation

    針對afc頻差估計中數據突變引起頻差估計較大誤差的問題，提出了利用數據符號同步對afc頻差估計時間窗口選擇的afc頻差估計方法。
  15. Either the application build will get an unresolved symbol error because it was using something not specified by the lsb, or the lsb stub libraries will ensure the correct abis per the binary specification

    或者應用程序的構建將因為使用了沒有被lsb指定的東西而出現不能解析的符號的錯誤，或者lsb存根庫將根據二進制規范來確保正確的abi 。
  16. Qr code is a kind of 2d matrix barcode. it has high density, great capacity that will influent coding of 2d - barcode. a rs code is cyclic symbol error - correcting code, which can correct lost or missing data for damaged symbols

    Qrcode是一種矩陣二維碼，具有信息密度大、容量高的優點，因此，譯碼時受噪聲的干擾大，採用糾錯能力比較強的非二進制bch碼中的一類? rs碼進行編碼，可以有效地抗除干擾進行糾錯。
  17. 5. on the detection of signal in bimodal noise, the study of one model is advanced abroad, and the performance of detection is given out by signal - to - noise ratio ; we study the three models synthetically, and give out the performance of detection by symbol error rate. 6

    關于雙模噪聲中信號的檢測，國外對雙模噪聲的一種模型的研究較成熟，並從信噪比的角度給出了檢測性能；本文對三種模型進行了綜合比較研究，並從誤碼率的角度給出了檢測性能。
  18. 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。
  19. A group of orthogonal frequency carriers are used in ofdm system to improve the using rate of spectrum. if the orthogonal character can be held and ignore the inter - channel interference ( ici ), the symbol error character of ofdm depend on the modulate of source codes. this dissertation propose the theoretic formula of ofdm - qam and ofdm - psk in this precondition

    為了提高頻譜利用率， ofdm系統使用了一組正交的子載波來傳輸信號，若能保證各子載波間的正交性不被破壞、不考慮通道間干擾（ ici ） ，則ofdm系統的誤碼性能由信元調制方案的誤碼性能決定，文中推導了該情況下ofdm - qam和ofdm - psk的理論誤碼率公式。
  20. Future mobile communications have to support the transmission of high rate data and multimedia applications in the radio spectrum, which is already extremely scarce. the basic idea of adaptive coded modulation is to maintain a constant throughput by varying the transmitted power level, symbol transmission rate, constellation size, coding rate or any combination of these parameters. thus, without sacrificing bit - error rate ( ber ), these schemes provide high average spectral efficiency by transmitting at high speeds under favorable channel conditions, and reducing throughput as the channel degrades

    自適應編碼調制（ adaptivecodedmodulation ， acm ）的基本思想是在不犧牲系統傳輸性能（比如ber ）為代價的前提下，通過單獨改變發送功率、波特率、編碼方案、碼率、調制方式，或者是綜合改變前面所述的各種參數，在有利的通道條件下，獲得較大的吞吐量，當通道質量下將時，相應地降低傳輸速率，最終達到提高平均頻譜效率的目的。
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