multipath fading 中文意思是什麼
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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。 -
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。 -
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。 -
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。 -
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。 -
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。 -
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。 -
Blind equalization is an effective way to suppress the inter - symbol interference ( isi ), which is caused by multipath fading communication channels
摘要在數字通信中，盲均衡是克服多徑衰落通道導致的碼間干擾的一種有效方法。 -
( 2 ) estimation and equalization of multipath fading wireless channel which was modeled as complex - taps fir have been done using cyclic prefix under i / q modulation
採用復抽頭系數的fir濾波器來對無線通道進行建模，並用循環前綴作為訓練序列對通道進行估計和均衡。 -
Multipath fading signal analysis with wavelet and fractal theories
基於小波和分形理論的多徑衰落信號分析 -
Blind multipath fading channel etimation and equalizer in digital communication
數字通信中的盲多徑衰落通道估計與均衡 -
This paper concentrates on the orthogonal frequency division multiplexing ( ofdm ) technique and some techniques to resist multipath fading. eliminate isi through use of a cyclic prefix. diversity techniques. using adequate ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading
本文研究了ofdm的基本原理及抗多徑衰落的一些措施，如加循環前綴，利用多徑進行分集接收，將ofdm與通道編碼及交織結合起來，頻域均衡。 -
Delivering quality video over wireless channels in real time is a challenging task. this isprimarily because of the throughput of a wireless channel may be reduced due to multipath fading, cochannel interference, and noise disturbance. therefore, there is a critical need forrobust transmission of video over wireless channels. recently, the emergence of mimo - ofdm has stimulated great interest in real time video communication, because this system can offer broadband for the multimedia data transmission over wireless channels
因為傳統的視頻壓縮技術是針對單天線系統，只產生單一的比特流，這與多天線系統不相適應，為此，需要將視頻信號分解成相應的多個碼流。本文探討一種將能視頻信號分解成多個碼流的多描述編碼方法，以適應多天線系統的傳輸。 -
When the channel changes rapidly, this proposed dynamic algorithm is efficient. other than above, this paper also studies the character of ofdm under multipath fading and gives the baseband computer simulation by systemview. at last, it performs ofdm dsp hardware plug - in simulation
利用systemview軟體進行模擬多徑通道下ofdm系統性能模擬，並探討了模擬過程中的一些問題，最後搭建了ofdm基帶模擬系統，並利用tms320c54dsp晶元，進行了ofdm硬體嵌入式模擬。 -
It inherits the anti - multipath fading ability of ofdm technology as well as the high user capacity of cdma. however, the ofdm - cdma system is vulnerable to channel estimation errors in fast varying channels
但是在快速時變通道中，正交頻分復用碼分多址系統對于通道估計誤差很敏感。 -
In current communication system, the application of dual - band dual - polarized antenna satisfies the needs of communication system ’ s upgrade, solves the problem of multipath fading, reduces the number and lowers the cost of the antennas
在現代通信系統中，雙頻雙極化天線的應用能夠滿足通信系統的不斷升級的要求，能有效解決多徑衰落問題，能減少天線數量、降低天線成本。 -
A novel cma - based blind adaptive multiuser detection in multipath fading channels
的盲多用戶檢測演算法 -
Making blind algorithm of multipath fading underwater acoustic channels suitable for high order qam signals
信號的水聲通道盲均衡演算法 -
Multiple access interference ( mai ) and multipath fading are two major factors limiting performances of cdma communication systems
多址干擾和多徑衰落是限制cdma系統性能的主要因素。 -
Ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading. 2
通道編碼與ofdm的結合（ cofdm ） ，增強系統進一步提高消除多徑影響的能力； 2
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