rayleigh channel 中文意思是什麼

rayleigh channel 解釋
瑞利通道
  • rayleigh : n. 雷利〈姓氏〉。
  • channel : n 1 水路，水道，渠，溝；海峽；河床，河底。2 （柱等的）槽，凹縫；【機械工程】槽鐵，凹形鐵。3 〈比...
  1. In rayleigh channel, the capacity is also improved

    在瑞利衰落通道上，性能亦有改善。
  2. Turbo codes represent the new code structures, which consist of pccc ( parallel serially convolutional code ) and sccc ( serially concatenated convolutional code ). in this paper, the background of turbo codes are firstly introduced, which includes the base principle of error correction code 、 block code and convolutional code ; the principle of turbo code and the iterative decoding is secondly expanded ; the key decoding algorithm : a revised map algorithm and iterative decoding theory are detailed ; then, a new turbo code structure : hccc ( hybrid concatenated convolutional code ) is presented, and the capacity of this code method is analyzed, the average capacity upper bound is derived ; at last, this code is simulated on awgn ( additive white gaussian noise ) channel and rayleigh fading channel

    本文首先介紹了turbo碼的背景知識，包括差錯控制的基本原理、分組碼和卷積碼；然後闡述了turbo碼的基本原理，包括turbo編譯碼器結構及迭代譯碼原理；較為詳細地描述了關鍵的譯碼演算法： ?種改進的最大后驗概率（ map ）譯碼演算法及迭代譯碼演算法；提出了一種新的turbo碼結構：混合turbo碼（混合級聯卷積碼） ；並用編碼性能聯合界分析方法對混合turbo碼進行了性能分析，得出了其平均性能上界；並在高斯白噪聲通道和瑞利衰落通道上分別作了一些應用研究及計算機模擬實驗。
  3. The estimation of frequency offset is based on pilot symbols and non - pilot symbols. this paper also discusses some parameters in the method and gives the way of compensation. to get the estimation method of doppler spread width, we model the rayleigh channel based on the conclusion of gans ’ spectrum analysis based on clarke model

    其中頻偏估計採用一種基於導頻符號和去極性非導頻符的方法進行估計，並通過試驗環境驗證了此方法，並確定了這個方法中的參數的取值，在此基礎上介紹了本系統中的頻偏補償方法。
  4. Transmission efficiency of data packet in rayleigh channel

    瑞利通道下的數據分組傳輸效率
  5. Performance analysis of differential frequency hopping communication system over rayleigh fading channel

    接收機在瑞利通道下的性能研究
  6. This thesis has improved the original estimation algorithm gave by mr zhou, and exended to the estimation of the snr of awgn channel and rayleigh fading channel

    本文把這種演算法應用到awgn通道和單徑瑞利通道下對信噪比或通道噪聲方差進行估計。
  7. The main program is designed by matlab language, others by c language. the simulation experiments are made in the gaussian and rayleigh channel

    使用matlab語言編制主程序， c語言編寫了部分子程序，採用高斯通道和瑞利通道對衛星通信系統進行了模擬實驗。
  8. When more than 10 6 ( 3, 2 ) parity check codes are used to estimate the snr of awgn channel and rayleigh fading channel, the estimation error is less than 1 %

    在bpsk信號通過awgn通道和單徑瑞利通道下使用（ 3 ， 2 ）碼估計，當統計的碼字數達到106以上時，估計誤差不會超過1 % 。
  9. This paper discusses the results in ricean channel in addition. the analysis of rayleigh and ricean channel are based on two cases, state information ( si ), and no state information ( nsi ). while the code rate approaching to zero, the shannon limit of bsc channel model is 0. 37db, the result of awgn ’ s is - 1. 59db, of rayleigh si is - 2. 31db, of rayleigh nsi is - 1. 45db, of riceansi is - 2. 31db, and of ricean nsi is - 1. 44db

    當碼率趨近於0時bsc通道下的香農限為0 . 37db ， awgn通道下的香農限為- 1 . 59db ，瑞利通道下通道增益已知時的香農限為- 2 . 31db 、通道未知時的香農限為- 1 . 45db ，萊斯通道下通道增益已知時的香農限為- 2 . 31db ，通道增益未知時香農限為- 1 . 44db 。
  10. This paper can be mainly summarized in to three aspects as follows : 1. firstly, the paper analyzes the system model of mimo, derive the formulas of channel capacity for the slow flat rayleigh fading channel, analyzes two improtant facts affected the system capacity, and then via the computer simulation we compare the channel capacity between the tranditonal wireless system and mimo system

    本文主要做了以下幾個方面的工作: 1 .分析了mimo系統的通道模型，理論推導了慢衰落平坦瑞利通道下mimo系統的通道容量公式，簡要分析了影響系統容量的兩個重要因素並且通過計算機模擬比較了傳統無線系統與mimo系統之間的通道容量。
  11. This method provides unequal protection for spiht bet stream with different importance, and adaptively adjusts the source and channel coding rates according to the time - varying characteristic of the channel, thus yields good performance and high reliability without adding extra bandwidth. simulations in rayleigh channel show that the scheme can obviously improve the image quality compared to eep and uep scheme, especially when the channel is in bad condition

    本方法通過對spiht編碼碼流重要性的不同而進行不同程度的保護，並利用通道的時變特性自適應地調整信源和通道編碼速率，從而在不增加額外帶寬的前提下有效地提高了系統的性能和可靠性，經過計算機模擬模擬，得出了在瑞利通道中，傳輸條件惡劣的情況下，本方法比eep和uep能更好的提高重建圖像的質量。
  12. Abstract : by comparing the channel capacities hetwem orthogonal space - time block coding and multi - antenna array system over rayleigh fading channel, some capacity loss for orthogonal space - time block coding is obtained, which is a function of the code rate, the rank of channel matrix and the number of transmitter and receive antennas, although the system of orthogonal space - time block codes is simple and easy to implemented. if is also shown that there is no capacity loss only if both the code rate and the channel matrix rank are all one

    文摘:在研究瑞利衰落條件下正交空時分組編碼通道容量的基礎上，將其與多發送多接收天線系統的通道容量進行了比較.比較結果表明，正交空時分組碼雖編碼簡單，易於實現，但在通道容量方面存在較大的損失，損失的程度與編碼碼率、通道矩陣的秩及收發天線數等因素有關.進一步研究表明只有當編碼碼率和通道矩陣的秩都為1時，才沒有通道容量的損失
  13. Causes small transmission delay, but computation is complex. the other is called dsova, which does not need to know csi, with low - computation complexity and small transmission delay, and is more suitable in the case when side information is unknown. these two algorithms effectively combine the ofdm technology and the sova algorithm in rayleigh channel, resulting in an efficient sova decoding under frequency - selective channel

    另一種是不含通道估計的差分sova演算法（簡稱dsova ） ，該演算法不必知道csi ，計算復雜度低，傳輸時延小，適用於邊沿信息（ sideinformation ， si ）未知的情況，這兩種演算法將ofdm技術和rayleigh通道下的sova譯碼演算法有機的結合起來，很好地實現了頻率選擇通道下的sova譯碼。
  14. A support vector machine based detection method on rayleigh channel

    通道下的支持向量機多用戶檢測方法
  15. Second, this paper design the simulation scheme of bicm for comparing the performance over fading channel and awgn channel that combine 2 / 3 rate, 4 states punctured convolutional code with 8psk modulation, matching block interleave or random interleave, transform through rayleigh channel or awgn channel and use the way that combine coherent demodulation with viterbi decoding in receiver. design the scheme of bicm _ id that use the iterative decoding technique and the scheme of tcm for compare

    為了驗證bicm和bicm _ id在衰落通道和加性高斯白噪聲通道（ awgn ）下的性能，設計了一個2 / 3碼率， 4狀態的鑿孔卷積碼經過塊交織或隨機交織，與8psk調制相結合，在rayleigh通道下或awgn通道下傳輸，接收端採用相干解調與維特比譯碼相結合的bicm方案，在接收端引入迭代反饋譯碼的bicm _ id方案，以及與之相比較的tcm方案。
  16. For example, the average number of retransmissions can be decreased 50 % at 1 db snr in the gaussian channel and 9 db snr in the rayleigh channel

    如在高斯噪聲環境下，信噪比為1db時減少超過50 % ；在瑞利噪聲環境下，信噪比為9db時也減少了50 % 。
  17. The analysis of performance and the simulation based on rayleigh channel

    通道模型下的性能分析與模擬
  18. As an optional code of 3g, the research of turbo code is significant. its performance over rayleigh channel is just to solve the practical problem

    而turbo碼付諸于實際的應用還存在問題，衰落通道譯碼的研究正是在turbo碼的實際應用上所提出的問題。
  19. We compare the performance of bicm to tcm, the performance of bicm to bicm _ id and the performance of bicm using block interleave to that using random interleave over rayleigh channel in simulation scheme. and compare the performance of bicm to tcm and bicm _ id over awgn channel in addition

    方案比較了rayleigh通道下bicm與bicm _ id的性能， bicm與tcm的性能，以及採用塊交織的bicm與採用隨機交織的bicm的性能，在awgn通道下bicm與tcm和bicm _ id的性能。
  20. 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。
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