multipath 中文意思是什麼

multipath 解釋
多徑傳播
  1. A doa estimation algorithm for multipath signals based on burg iterations

    基於貝葉斯網路的并行分佈估計演算法研究
  2. 7. in chapter 8, a new method for estimating the doppler and multipath time delay of the overlapping echoes for lfm pulse radar by only one period pulse signal is presented

    7 .在第八章提出了一種對lfm脈沖雷達回波d叩pler頻移和多徑時延進行聯合估計的方法。
  3. Multipath distinguish factor of rake receiver in mobile radio channels

    接收機的多徑分辨系數
  4. Shortwave channel is time varying transmission channel. it has dispersion in frequency and time domains. this characteristics hinds the data transmi - ssion at high speed and the correction of received data. in this dissertation i have analyzed the statistic characteristic of shortwa - ve channel, established the model of shortwave channel and simulated the rayl eigh fading distribution. the technology of spreading spetrum has been proved that it has the capability for anti - multipath and discerning multipath

    在短波通信中，由於通道的時間色散和頻率色散，引起多徑展寬和多徑衰落，前者限制了數據的傳輸速率，後者造成短波數據通信中出現突發錯誤，為了解決多徑效應對短波通信的影響，本文所做工作如下：首先詳細分析了短波通道的統計特性，建立其數學模型；其次分析了擴頻通信的特點，從理論上證明擴頻技術不僅具有抗多徑干擾能力，而且具有分離多徑的能力；介紹了傳統的rake分集合併技術的特點。
  5. In order to utilize the resoluble ability of signals and improve resistant ability to multipath fading, the rake receiver is a good option. but proper rake operation requires information about the delays and attenuations of the channel paths which is difficult to obtain

    本文以uwb通信系統為背景，主要研究uwb系統室內密集多徑通道的通道估計方法，以及基於turbo原則的迭代通道估計的接收機結構。
  6. Stbc ( space time block code ) is the main method to realize mimo diversity, and it is good at mitigating the influence of wireless multipath fading

    而stbc （ spacetimeblockcode ，空時分組碼）則是實現mimo分集的重要手段，長于對抗通道的多徑衰落。
  7. The theoretic formulas imply that mimo system can make use of multipath fading in full of scatter enviorment and its channel capcacity is in proportion to the transmt or receive antenna. 2. paper mainly explains the basic principle of bell laboratory layered space - time ( blast ) architecture

    2 .論文重點闡述了實現mimo系統中空間復用技術的貝爾實驗室空時分層（ blast ）結構的基本原理， blast結構作為實現mimo系統巨大容量的一種有效的手段，其核心是基於排序的串列干擾消除（ osic : orderingsic ）檢測演算法。
  8. In the thesis, i introduce the theory and application of gps carrier phase measurement, analyze the errors in the observation of gps signal, study the ways to reduce these errors, specially for the error caused by multipath

    論文介紹了gps載波相位測量技術的原理和應用，分析了gps觀測量的誤差，研究了減小和消除各種誤差的方法，重點是減小多徑效應的影響。
  9. Two simulation algorithms of realization channel characteristic are analyzed emphatically : shaping of slow fading with correlation and generation of frequency - selected multipath fading

    重點分析了實現通道特性模擬的兩種演算法：慢衰落的相關性整形和頻率選擇性多徑衰落。
  10. Because the hybrid acquisition scheme ( combines parallel search with serial search ) based on the correlator provides the flexibility in the trade - off between the mean acquisition time and system complexity and is easy to implement, it ? focus on the scheme here. on the other hand, this paper analyzes the effect of multiple access inference ( mai ) on the code acquisition performance for the multipath fading channels

    基於相關器解擴的串-並混合方案由於有著可在平均捕獲時間和電路復雜程度（這是捕獲電路的兩個重要指標）這兩個技術指標間靈活折衷的優點和易於實現的特點，本文的重點就放在該方案中。
  11. The research of multipath parameter estimation algorithms and accomplishing them with software. to estimate multipath parameters, multipath delays must be estimated by code filtering in advance

    通道多徑參數估計演算法的研究和軟體實現在估計多徑參數時，首先使用碼濾波方法估計出信號的多徑時延。
  12. Most of error sources can be eliminated by double differencing due to the short antenna seperations within gps based attitude determination system, multipath is the dominant error source

    Gps姿態測量中，大部分誤差源可通過雙差得到抑制或降低，多徑誤差成為主要的誤差源。
  13. Depending on the characteristic of the mobile station system can reduce more influence such as multipath interference and none - line - of - sign ( nlos ) propagation than fixed station

    同時利用該系統自身特點，避免了許多在固定站系統中多徑干擾、非視距傳播等定位難題。
  14. The videos, voices, data combined traffic and high speed data are becoming more and more predominent in the future, and how to efficiently transfer this multi - medium integrated - data is one of the researcher ' s interesting field. the cdma system, which has striking advantages of anti - multipath fading, soft capacities and large capacities over fdma and tdma systems, has been focused by all of the countries

    未來信息社會中，圖象，話音，數據相結合的多媒體業務和高速數據業務量越來越佔主要地位，如何有效地傳輸這種多媒體數據，已經成為移動通信中的研究熱點之一。擴頻技術由於具有抗多徑，軟容量和時分多址與頻分多址更大的容量和優勢，而受到各國研究者的重視。
  15. The multipath interference, resulted from interfering between the signals of the line of sight ( los ) and the line of ground reflection in vhf - rc, makes bit error rate of data transmission increased and system reliability attenuated

    當前，中國水波中繼通道以直視路徑傳播為主，同時存在地面折射路徑對直射信號產生干涉，造成多徑干擾。這種干擾使得信號傳輸的誤碼率上升，系統可靠性下降。
  16. In order to achieve high data rates on the severely band - limited underwater acoustic ( uwa ) channels, bandwidth - efficient modulation techniques must be employed, together with some sophisticated signal processing algorithms, such as adaptive equalization technique for the intersymbol interference caused by channel multipath propagation

    在帶寬嚴重受限的水聲通道中實現高數據率通信，必須使用高帶寬利用率調制技術，並結合自適應均衡等技術以有效地克服通道多途傳播產生的符號間干擾。
  17. The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above

    但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。
  18. Multipath time delay estimation based on adaptive parameters approach using fourth - order cumulants

    基於四階累積量的自適應參數型多徑時延估計
  19. The improved algorithm not only inherits the fast convergence trait from rls and realizable systolic array from qr _ rls, but also eliminates square - root operation and gets directly equalizer output signals from systolic array. so this algorithm has more simple operation, faster executing speed, less hardware resource and lower hardware cost. some different equalization algorithm are imitated on the qpsk communication system with multipath channel

    其次對一些成熟的自適應均衡演算法（如lms演算法、 rls演算法、 qr _ rls演算法、逆qr _ rls演算法）進行了分析;介紹了一種改進后的無平方根的qr _ rls演算法，該演算法不但繼承了rls的快速收斂特性和qr _ rls演算法的systolic陣列可實現性，還取消了qr _ rls演算法的平方根運算，使演算法在硬體實現時運行速度更快，佔用資源也更少，同時該演算法還可由systolic陣列直接得到均衡后的輸出信號，運算量更小。
  20. Furthermore, the most advanced adaptive arrays can take advantage of the multipath phenomenon to focus radio signals still further

    不僅如此，最先進的適應型陣列還可以利用這種多路徑現象，進一步集中無線電訊號。
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