wideband channel 中文意思是什麼
wideband channel
解釋
寬帶通道-
To utilize the advantages of dsp chips, the system should be computing sources economical. according to digital signal processing theory, the poly - phase fir can help reduce the workloads of the ddc / duc. therefore, adding the complex carrier mixers, the channelization system ( a method of using a single wideband facility to transmit many relatively narrow - bandwidth signals. by subdividing the frequency spectrum used in the wideband channel ) can be formed utilizing the characters of fft
為了使開發出的軟體可以適用於高速dsp器件開發，節省系統資源，課題首先從數字信號處理的理論進行分析，得出可以利用抽樣率轉換的數字濾波器的特點，即多相濾波實現數字上下變頻計算負擔的減小，之後進一步將多相濾波器與頻譜搬移部分結合，通過公式的推導，得出可利用快速傅立葉變換的特點實現多路信號的通道化發射和接收的處理模型。 -
First, the structure of sdr and the physical - channel of td - scdma are expounded, then software and hardware models of the terminal receiver, which use the sdr structure of wideband and bandpass sampling in if ( intermediate frequency ), are put forward
首先對軟體無線電的組成結構和td - scdma物理通道進行了闡述，在此基礎上提出了基於寬帶中頻帶通采樣軟體無線電結構的td - scdma終端接收機的軟硬體模塊設計方案。 -
In the second chapter, a wideband mimo channel model with multiple - tap was integrated according to the angle of departure of the transmitting signal and its spread angle, the angle of arrival of the receiving signal and its spread angle, power azimuth spectra, doppler spectrum and the geometric construction of antenna array both sides of transmit and receive, on the basis of full research on the theories of space - time channel model proposed in the recent literature
第二章在對最近文獻中提出的一些空時通道模型理論進行詳細研究的基礎上，根據發射信號的離開角及其擴展角、接收信號的到達角及其擴展角、功率方位譜、多普勒譜和收發兩端天線的拓撲結構，綜合了一個多抽頭的寬帶mimo通道模型。 -
Secondly, basing on single channel if sr receiver mathematic model, this thesis has designed if sr receiver subsystem and brought forward its design project and system circuit principle diagram, and explained the system working principle. furthermore, this thesis introduces the working principles and respective applications of wideband high - speed adc ad6640, ddc ad6620 and high - speed dsp tms320c6713 according with the if sr receiver subsystem high - speed analog digital conversion department, digital down conversion department and high speed digital signal processing department. thirdly, the thesis emphatically demonstrates the software realization department of the if sr receiver subsystem, which including ad6620 ' s inner parameter software setup, tms320c6713 data transmission and processing and the quadrant demodulation algorithm program realization
其次，基於單通道中頻軟體無線電接收機數學模型，本文設計了中頻（ if ， intermediatefrequency ）軟體無線電接收機子系統，給出了中頻軟體無線電接收機子系統的設計方案和系統電路原理圖，說明了系統工作原理，並分別對應系統中的高速模數轉換部分、數字下變頻部分、基帶數字碩士學位論文軟體無線電理論研究及中頻軟體無線電接收機子系統設計信號處理部分，介紹了高速adcad664o ，數字下變頻器（ ddc ， digitaldownconverter ） ad6620 ，高速數字信號處理器（ dsp ， digitalsignalproeessor ） tms320c6713的工作原理，以及它們在中頻軟體無線電接收機子系統中的應用。 -
The project is to develop the 100mhz wideband digital storage oscilloscope ( wdso ) ， typical performance character : input signal - 3db bandwidth is 100mhz, real time sampling frequency is 20msa / s, equivalent sampling frequency is 10gsa / s, resolution is 8bits, dual signal channel, and delicacy is 5mv 5v div per channel ， time sweep velocity is 2. 5ns - - 5s div 。 so the project is provided with higher performance - to - price ratio, stronger competitive capacity in market and widest applied foreground at the area of wdso
本次課題的具體目標是實現100mhz帶寬的數字存儲示波器正樣機的研製，具體主要性能指標達到最高實時采樣率20msa / s 、等效采樣率10gsa / s 、被觀測信號3db模擬帶寬達100mhz 、采樣數字解析度8bit ；雙通道，幅值靈敏度： 5mv 5v div ，掃速2 . 5ns - - 5s div 。該方案具有較高的性價比，較強的市場競爭力和廣闊的應用前景。 -
Abstract : in this paper, an orthogonal multicode wideband cdma system modelincluding pilot channel based on chaos spreading sequences is given. based on chaos sequences, with pilot channel inserted orthogonally, it is shown that the performance of the system is improved. the performance of the system in fading channel is analyzed
文摘:提出一種基於混沌序列含導頻信號的寬帶正交多碼cdma系統模型，利用混沌序列以及採用正交插入導頻信號提高系統性能，並對此模型在衰落通道中的性能進行分析。 -
As we all know, the capability of wireless communication system is constrained by radio propagation channel, especially for future wideband communication system. so it needs more signal processing techniques to withstand bad radio propagation environment, such as diversity combination, coherent detection and channel encoding and decoding etc. for mimo physical layer approaches, channel state information is a prerequisite, thus comes many channel estimation approaches and algorithms
無線通信系統的性能主要受到移動無線通道的制約，特別對未來的寬帶移動通信系統更需要採用很多信號處理技術來對抗惡劣的無線傳播環境以提高系統性能，比如常見的分集合併、相關檢測和通道編解碼技術等，而採用這些技術的前提就是要知道通道的狀態信息（ csi ） 。 -
With the downlink simulation model constructed, performance of wideband cdma under different radio propagation environment and vehicular speed is simulated. based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts, performance of multicarrier cdma system with go sequences under different radio environment is investigated
基於多載波直接序列碼分多址在乎坦衰落通道中序列偏移小於1個碼片及在頻率選擇性衰落通道中偏移任意個碼片的系統模型，本文還分析了採用廣義正交序列的多載波碼分多址系統在不同無線傳播環境下的性能。 -
It has many benefits due to its ultra - wideband nature which including the following : not sensitive to channel fading, low transmit power, extremely difficult to intercept, low complexity of transceiver structure, fine range resolution ( centimeter scale ) for location and so on this paper combines uwb technology and mobile ad hoc network technology, concerting the lasn project of national key laboratory of communication, researchs the baseband process cell of uwb communication transceivers on the base of arithmetic research and spot test
本文結合uwb技術和移動自組織網（ manet ，即mobileadhocnetwork ）技術，配合通信抗干擾技術國防重點實驗室uwb技術研究項目「 lasnproject 」的工作進展，在演算法研究和現場測試的基礎上，對uwb通信節點樣機的基帶處理單元進行設計研究。樣機結構包含三大模塊:天線、用分立器件形成的射頻電路、由fpga構建的基帶處理單元。 -
The research in software radio is not more than ten years, but has made a great many fruits, but it is too little to set up an integrated theory system, and software radio includes many areas such as modern communication system ( which includes modem source / channel encoding and decoding, equalization, encrypt and decrypt and so on ), wideband antenna theory, digital signal process, microelectronics, computer and so on. this thesis mainly does research for modem in modem communication
軟體無線電經過不到10年的研究，盡管取得了很多成果，但是對于建立一套完整的理論體系來說，還遠遠不夠，況且軟體無線電涉及的領域多、面廣、發展快，如現代通信理論（含調制解調、信源通道編解碼、均衡、加密解密等） 、寬帶天線理論、數字信號處理、微電子、計算機等。 -
Chapter 2 describes the characteristics of wireless channel, presents vector channel model for wideband cdma systems, and emphasizes on the characteristics of indoor wireless channel
第二章描述了無線通道的特點，給出了寬帶cdma系統的矢量通道模型，並著重分析了室內無線通道的特徵。 -
The closed - form performance formulae of cck modulation are derived under awgn channel and rayleigh fading channel, whose validity is proved by simulations. multi - carrier wideband cdma architecture based on complete complementary codes spread ( ccc - cdma ) has high spectrum efficiency without mai theoretically, which meets the general requirements of b3g communications
研究了高速無線局域網ieee802 . 11b中的基帶技術，特別是基於互補碼擴頻的cck調制，推導出其在高斯噪聲通道和在多徑衰落通道條件下的性能公式。 -
The method of using a single wideband facility to transmit many relatively narrow - bandwidth signals by subdividing the frequency spectrum used in the wideband channel
使用單個寬帶設備傳送許多窄帶信號的方法。它是通過細分寬帶通道上的頻譜來實現的。
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