無噪聲道 的英文怎麼說
中文拼音 [wúzàoshēngdào]
無噪聲道
英文
noiseless channel-
As a combination of ofdm with space - time coding technique, mimo - ofdm becomes more and more important in the future wireless communication systems, the mimo - ofdm system can not only effectively enhance the transmission rate and capacity of the wireless communication system but also greatly mitigate the effections of mufti - path fading and interfere
Mimo - ofdm技術將ofdm與空時編碼技術有機的結合在一起，能夠大幅度的提高無線通信系統的通道容量和傳輸效率，並能有效的抵抗多徑衰落、抑制干擾和噪聲。Convolutional coding is a coding scheme often employed in deep space communications and recently in digital wireless communications. it offers an alternative to block codes for transmission over a noisy channel
卷積碼被運用於衛星通信和無線通信系統中，它提供了一種不同於分組碼的在噪聲通道下傳輸信息的一種編碼方案。Then we introduce the character of the atmosphere channel, which we emphasized on the atmosphere scatter, absorption and scintillation ' s effect on the laser beam. in chapter, we explain why we used cassegrain telescope to collect the optical signal at first, then the lightsource, detector, front amplifier used in optical communication has been compared to that of fiber communication, the noise including shot noise, thermal noise and background light noise has been explained here for analysis the snr and ber in the next section
在第三章介紹無線光接入系統的光收發單元，採用多孔徑卡塞格倫式的收發天線對消除減小大氣湍流影響有較大作用，針對大氣通道的特點無線光系統收發單元在光源、光探測器、前置放大電路上存在許多有別于光纖通信的技術，同時還闡述了光接收機包括背景噪聲的噪聲機制和接收靈敏度、誤碼率等指標，最後給出了一個整個傳送鏈路的功率預算。According to the characteristics of pipeline leak signals that the influence degrees of burst interference noises are various in each local area, this paper optimizes the uniform quantization to be adaptable, and proposes an adaptive quantization
根據管道泄漏信號局部區域受到突發干擾噪聲影響程度的不同，本文進一步優化均勻量化器，將其改進為自適應量化器，提出了基於突發干擾噪聲的自適應量化近無損壓縮演算法。This paper can put into four parts ? this first part is the description and theoretical analyses of source coding, which focus on the research of optimizing equal quantization ? the second part presents the theoretical description of joint channel - source coding, which focus on the research of combined channel - source coding o the third part is about the application of combined channel - source coding to two different channel models, binary symmetric channel and cdma channel o in this part, two different coding designs are given according to different characters of these two channels ? and the last part is the description of simulation of combined channel - source coding ? most of my work are about two parts, one is to find the most appropriate quantization steps and centroid points of separate channel - source coding, another is to simulate the combined channel - source coding ? comparing the simulation results of separate channel - source coding and combined channel - source coding, the characters of joint channel - source coding are given
本論文可以分成四部分：第一部分給出了信源編碼的基本概念和理論分析，重點放在最優均勻量化編碼的研究方面；第二部分給出了通道?信源聯合編碼的原理敘述，重點放在復合式通道?信源編碼的分析研究上；第三部分將通道-信源聯合編碼原理應用在兩種噪聲通道上：離散無記憶通道和cdma通道，並根據兩種通道的不同特點詳細描述了兩種相應的編碼設計方案；第四部分給出了復合式通道-信源編碼的模擬結果以及對結果的相應分析。In this paper a multi - passage controlling tactic composed of infinity impulse filter is presented to solve the problem in theory, but actual effect must be verified by experiment in future
文章嘗試採用由無限脈沖濾波器組成的多通道控制策略，從理論上解決源噪聲信號採集問題，其實質效果還有待於後續實驗驗證。In the hardware implementation of a multi - channel active noise control system, the computational complexity is increased sharply when the number of filter coefficients and channels are increased
摘要在多通道有源噪聲控制系統的硬體實現中，當通道數目增大或濾波器長度較長時，常規的多通道演算法運算量急劇增加，使控制器可能無法實時實現。In the system, the low voltage power line is the first signal tunnel without any other relay equipments between customer terminal and substation collector, public telephone line serves as the second signal tunnel between substation and management center computer. as a breakthrough of conventional concept of electricity meter, this thesis initiate a new concept, namely, intelligent power customer terminal ( shortly, customer terminal ), which is developed with spread spectrum plc communication functional and possesses many advanced functions, such as, in addition to electric energy acquisition, guarding against electricity pilfering, preventing wrong connection, protecting malfunction, remote communication ( for example, remote power supply or halt, remote configuration of electricity meter, remote load control, etc ), and so on
本文首先系統地總結了目前國內外低壓電力網數據傳輸技術的研究現狀和存在的問題，在此基礎上，從理論上論證了在低壓電網上應用擴頻載波數據通信技術的可行性和優越性，並重點論述了擴頻載波技術抗電力線噪聲干擾的機埋；本文提出了一個新穎的基於低壓電力線擴頻載波通信技術的集中遠抄系統的總體方案，即由用戶終端、集中器和電能管理系統所組成的網路系統，其中，用戶終端到配變集中器用低壓電力線作為通道，中間無需其他硬體中繼設備，集中器到電能管理系統用公用電話網作為通道。There was even a time when st. francis quieted a flock of noisy birds that were interrupting a religious ceremony ! much to the wonder of all present, the birds remained silent until the ceremony was completed
有一次，在一場宗教儀式中，出現一群聒噪的鳥兒，干擾了法會的進行，聖方濟不但使它們平靜下來而且一直到儀式結束，鳥兒們都靜默無聲，在場的人莫不稱奇道絕。We also select the microchip pic16f877 made by microchip co. ltd as a control chip to realize micro - computer control. this system use three separate channel to find out the " across the zero point " of each back - emf. the program use digital filter to wipe off the pwm interferences and the commutating interferences
系統中採用三個獨立通道分別檢測無刷電機三相繞組的反電勢的各自過零點，同時在軟體中採用數字濾波以消除其它噪聲干擾，使檢測電路檢測到的反電勢過零點更加準確可靠，實現了對五位置傳感器直流無刷電機的數字控制。In mobile communication and high - speed wireless digital communication, multi - path, the finity of channel bandwidth and faultiness of the channel, lead to the bringing of intersymbol interference ( isi ) when data transfer. this is an important factor that degrades the performance of communication. however channel equalization technique can eliminate the isi and noise, it can also reduces the bit error ratio
在移動通信及高速無線數據通信中，多徑效應和通道帶寬的有限性以及通道特性的不完善性導致數據傳輸時不可避免地產生碼間干擾（ isi ） ，成為影響通信質量的重要因素，而通道的均衡技術可以消除碼間干擾和噪聲，並減少誤碼率。We study holevo capacity of a single mode squeezed channel, derive the main formulus for computing the capacity. the result suggests that in many case the capacity is achived when the input is a squeezed state
對熱噪聲通道，表明了容量在輸入信號為熱噪聲信號時達到，壓縮態無助於達到通道容量；而對于壓縮通道，容量一般在輸入壓縮態時達到。Future wireless applications, such as video cellular telephony, wireless internet access and wireless lans, have open a new field for wireless multimedia communication - image communication, which push a growing demand for fast, economic, low - energy mobile multimedia communication. however, there are still several bottlenecks - bandwidth, low - delay, power and noise etc, need to be solved
然而由於無線視頻通信存在許多瓶頸與協議問題：包括帶寬要求、實時性要求、功率限制和通道噪聲等，面向無線的視頻編碼與傳輸技術已成為當今信息科學與技術的前沿課題。Simulator presented in this paper provides a direct interface for the test of shortwave communication system, which well represents various features of hf channel such as multi - path delay, rayleigh fading, doppler shift, doppler spread, gaussian noise and impulsive interference, etc. in order to realize the channel simulation for the intermediate frequency signal, we, inspired by the idea of soft - defined radio, bring forward a new design method that the channel simulator consists of several dsp chips
本文研製的模擬器提供介面直接對短波通信系統進行測試，能夠全面反映短波通道的多徑時延、瑞利衰落、多普勒頻移、多普勒擴展、高斯噪聲和脈沖干擾等特性。為了實現對中頻信號的通道模擬，開發出一個結合軟體無線電思想的由多個數字信號處理晶元構成的短波通道物理模擬器。As a combination of ofdm with space - time coding technique, mimo - ofdm has recently received considerable attentions, which can not only effectively enhance the transmission rate and capacity of the wireless communication system but also effectively combat multi - path fading and interfere
Mimo - ofdm技術將ofdm與空時編碼技術有機的結合在一起，能夠大幅度的提高無線通信系統的通道容量和傳輸速率，並能有效的抵抗多徑衰落、抑制干擾和噪聲，從而引起了通信界的廣泛關注。Wavelet transform domain adaptive filtering algorithm for removing the seamless pipe noise contained in the magnetic flux leakage data
去除漏磁數據中無縫管道噪聲的小波域自適應濾波演算法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。While on another hand, the kalman filter ' s input, including signal and noise, should be well known in statistic mean, in fact, we often cannot get them, then we ca n ' t realize the best estimate
另一方面，對于卡爾曼濾波，信號和噪聲作為濾波的輸入，在統計意義下，是已知的。而在實際中，常常無法知道其統計特性，或者它是隨時間變化的，上述濾波器就無法實現最優濾波。分享友人