multipath channel 中文意思是什麼
multipath channel
解釋
多路徑通道，多路徑通道-
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。 -
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。 -
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。 -
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。 -
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。 -
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。 -
And pays emphasis on analyzing the system structure and system flow, the core techniques, the channel characteristic and parameters of dvb - t system. the system adopts some core techniques such as cofdm, a lot of tps ( transmission parameter signalling ) insert and guard interval, and so on. so it can withstand high - level ( up to odb ), long delay static and dynamic multipath distortion
論文首先描述了數字電視地面廣播的需求條件，技術難點和目前存在的問題，並重點分析了dvb - t系統結構流程，核心技術及系統通道特性和參數，該系統採用了cofdm （編碼正交頻分多路復用） ，大量導頻信號插入和保護間隔技術等核心技術，使之能抵抗高電平（ 0db ） ，長延時的靜態和動態多徑失真，有利於數字和模擬電視的混合傳輸，它的多載波調制模式功能和性能在移動和便攜接收、同頻網等方面具有獨特的優勢。 -
In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly. multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers. by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable
在wcdma系統中，為正確解擴解調接收到的擴頻信號，接收機本地產生的擴頻碼（ pn碼）相位必須和接收信號中的擴頻碼相位完全同步;同時移動通信環境中的傳輸信號由於接收機和發射機之間的直達路徑有可能被建築物或其他障礙物所阻礙，總是經過折射或反射的多條路徑后才到達接收機，從而產生多徑通道。 -
Statistics and simulations of wssus time - varying simulations multipath channel
時變多徑通道的統計特性與模擬 -
This advantage is shown that in awgn and multipath channel, its estimation mean bias and estimation error square root is smaller than the sc method
這種優點體現在awgn和多徑通道中自適應分段相關時間同步法的估計均值偏差和錯誤方差均小於sc方法。 -
Then critical technologies of simulation system are discussed, including frame processing structure, fh sequence generator, simulation models of path loss and multipath channel, simulation of signal propagation delay and jamming signal etc
其次，討論了模擬系統實現的關鍵技術，包括幀處理結構、跳頻序列發生器、路徑損耗與多徑通道模擬模型、信號傳播延時及干擾信號的模擬等。 -
The characteristics of the underwater acoustic channel are analyzed in this thesis, with the emphasis on the multipath propagation characteristics. and the underwater acoustic multipath channel model is established on the basis of ray theory
在本論文中，我們對水聲通道特性，尤其是水聲通道的多徑傳播特性進行了分析，並且在聲線理論的基礎上建立了水聲多徑通道模型。 -
To despread and demodulate the signal correctly in the spread spectrum system, the pn code phase of the receiver must be synchronized with that of the input signal precisely. multipath channel exists in the wireless environment for radio signal reflection by obstacles between transmitters and receivers
在擴頻通信系統中，為正確解擴和解調接收到的擴頻信號，接收機的pn序列相位和接收信號的pn序列相位必須完全同步；同時移動無線環境中的傳輸信號總是被收發信機之間的許多障礙物所反射，從而產生多徑通道。 -
Two major factors that limit the performance of ds - cdma systems are multipath channel distortion and multiple - access interference ( mai )
對于ds - cdma移動通信系統，通道的失真與多址干擾是限制系統性能的主要因素。 -
Simulation shows that, compared with conventional methods, this receiver can provide better performance under various multipath channel conditions
計算機模擬結果表明，相比于傳統的接收系統，該系統在各種多徑條件下都具有一定的優勢。 -
4. extending cumulant invariants based signal classification algorithms to gaussian multipath channel environment, we proposed recognition algorithm using multi
對更高調制階數mpsk 、 mqam和aisk信號分類的計算機模擬試驗，證實了子類分類演算法的有效性。 -
In the dissertation, firstly, the traits of wireless communication channel are described, and the imitated model of multipath channel is founded. secondly, an improved qr _ rls algorithm is introduced
本文首先描述了無線通信中多徑通道的傳輸特徵，並建立了本文所應用的多徑通道模擬模型。 -
Aiming at uwb indoor multipath channel, we propose a channel estimation algorithm with training bits. finally, we propose an iterative channel estimation algorithm based on turbo principle
隨后針對uwb系統室內密集離散多徑通道，根據rake分集接收技術對通道參數的要求，提出一種基於訓練比特的uwb通道估計方法。 -
This thesis focuses on the baseband technology of ieee 802. 11 / 1 ib physical layer, which includes the characteristics of indoor multipath channel ieee 802. 11 confronts, estimation of this type of channel, modulation and receiver structure
本文主要研究ieee802 . 11 11b物理層的基帶部分的有關技術，包括ieee802 . 11所面臨的通道的特點、通道的估計以及調制和有關接收技術等。
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