additive channel 中文意思是什麼
additive channel
解釋
加性通道-
Thereafter, the applications of go sequences in single - cell s - cdma systems are discussed in this thesis. in additive white gaussion noise ( awgn ) channel, interference components in s - cdma systems accommodating more users than the spreading factor is analyzed based on the theoretical bound of the periodic correlation mean square property. then two interference - suppressed s - cdma system models of augmented capacity are proposed, along with the analysis and simulation results
在加性白高斯噪聲（ awgn ）通道條件下，以序列集周期相關均方特性理論界為基礎，對序列個數大於系統擴頻因子的s - cdma系統干擾組成進行了分析，並基於截短wh序列提出了兩種高容量低干擾s - cdma系統模型，給出了分析和模擬結果。 -
Turbo codes represent the new code structures, which consist of pccc ( parallel serially convolutional code ) and sccc ( serially concatenated convolutional code ). in this paper, the background of turbo codes are firstly introduced, which includes the base principle of error correction code 、 block code and convolutional code ; the principle of turbo code and the iterative decoding is secondly expanded ; the key decoding algorithm : a revised map algorithm and iterative decoding theory are detailed ; then, a new turbo code structure : hccc ( hybrid concatenated convolutional code ) is presented, and the capacity of this code method is analyzed, the average capacity upper bound is derived ; at last, this code is simulated on awgn ( additive white gaussian noise ) channel and rayleigh fading channel
本文首先介紹了turbo碼的背景知識，包括差錯控制的基本原理、分組碼和卷積碼；然後闡述了turbo碼的基本原理，包括turbo編譯碼器結構及迭代譯碼原理；較為詳細地描述了關鍵的譯碼演算法： ?種改進的最大后驗概率（ map ）譯碼演算法及迭代譯碼演算法；提出了一種新的turbo碼結構：混合turbo碼（混合級聯卷積碼） ；並用編碼性能聯合界分析方法對混合turbo碼進行了性能分析，得出了其平均性能上界；並在高斯白噪聲通道和瑞利衰落通道上分別作了一些應用研究及計算機模擬實驗。 -
Many of communication systems take the convolutional code and viterbi algorithm as the channel coding scheme. the viterbi algorithm decoding is a kind of maximum likelihood decoding, and its performance is good over additive white gaussian noise ( awgn ) channel, but when burst errors occur, the decoding performance may be greatly degraded
維特比譯碼演算法是最大似然譯碼，在由高斯白噪聲引起的隨機錯誤的通道中有良好的性能，但當通道錯誤集中或為突發錯誤通道時，維特比譯碼演算法則性能急劇下降。 -
The simulation channel models include additive white caussian noise channel and multi - path rayleigh fading channel
在模擬模型中，採用加性高斯白噪聲和多徑瑞利衰落兩種通道模型。 -
In awgn ( additive white gaussian noise ) channel, we introduce a new single - tone interference suppression scheme in the single - tone interference environment
針對加性白高斯噪聲通道中的發射信號，提出了利用單音信號頻域特性的單音干擾抑制方法。 -
In additive white gaussian noise ( awgn ) channel, we introduce a method for synchronization of symbol timing and frequency for two - dimensional spread spectrum system without prior knowledge of spread spectrum matrix
摘要針對加性白高斯噪聲通道，考慮未知二維擴頻矩陣的條件下，提出了一種二維擴頻系統的時頻同步方法。 -
In the thesis, from a new point of view, we investigate the application of non - linear dynamics into the turbo codes and mud area, namely, how the chaos dynamics can be applied in turbo codes development, and how the chaos and neural networks dynamics can be applied in mud. the main contribution of the thesis can be summarized as follows : 1. an iterative decoding algorithm based on map ( maximum a priority ) and soya ( soft output of viterbi algorithm ) in awgn ( additive white gauss noise ) channel is proposed, and the effectiveness of the algorithm is justified by simulation performed on awgn and rayleigh fading channels
為介紹本文作者的創新工作，在論文簡要講述3g 4g的發展過程及其關鍵技術，其中著重介紹turbo碼和多用戶檢測的發展過程、研究內容和基本原理之後詳細介紹了作者的如下貢獻和創新： 1 、根據turbo碼的迭代譯碼原理，系統地推導出awgn通道中turbo碼基於map和sova的迭代譯碼演算法，演算法的有效性由awgn通道和rayleigh衰落通道下的性能模擬得到證實。 -
Current analyses of the watermarking channel are typically limited to the additive white gaussian noise ( awgn ) channel
當前典型的水印通道分析被限制在加性白高斯通道上。 -
Subsequently the channel was modeled for three types namely additive white gaussian noise, flat fading and frequency selective fading. lastly, the receiver was studied
接下來通道建模成三種不同的類型，即加性高斯白噪聲通道、平坦衰落通道和頻率選擇性衰落通道。 -
In the point of - information theory ; - the - baseband binary pulse amplitude modulated ( pam ) signal transmission, via turning the nonlinear receiver ' s parameters, is studied over an additive white gaussian noise ( awgn ) channel. it is demonstrated that the channel capacity of binary communication systems, for a given signal added noise, can be maximized by optimal designed receivers. this new form of sr is referred to as psr in a broad sense
本文研究並設計了含有雙穩態隨機共振系統作為一個接收裝置的基帶數字通信系統，在加性高斯白噪聲通道中，通過研究這個非線性接收器的性能，發現了數字信號傳輸中存在的參數調節隨機共振現象?通道容量隨著系統響應速度的增加具有一個共振峰值，並對這種非線性現象發生的基本機理進行了解釋。 -
Unlike pilots which are used for estimation of channel and must waste some useful bandwidth, the ppss, whose power can be boosted 3db or 6db to suppress efficiently the additive noise, is useful data transmitted, thus efficiency of the ofdm has been increased
與用於做通道估計的導頻符號不同， ppss傳輸的是有用的數據，因此提高了系統的帶寬利用率， ppss的平均功率增加3db或6db可有效抑制通道的加性高斯噪聲。 -
In the thesis, an approach that is based on signal - space concepts is used to efficiently evaluate the ber performance of mpsk and mqam over an additive white gaussian noise channel. in particular, accurate ber approximations are obtained and shown to be in good agreement with system simulation results. it may be useful to research and development of digital modulation technologies in hfc of our country
嘗試採用基於信號空間的分析方法，給出了awgn通道中mpsk和mqam的ber的計算方法以及由這種方法得到的ber性能曲線，然後將信號空間分析法得到的結果與通信系統模擬的結果進行比較，證明其與模擬結果較好地吻合。 -
The accuracy of a speech recognition system in actually noisy environment is seriously affected by the additive noise and the channel distortions
實際環境中的背景噪聲和傳輸通道變化所引起的畸變嚴重影響了語音識別系統的性能。 -
That is by inserting known symbols or pilots in time and frequency domain to estimate the channel frequency response. the proposed method employs iterative low - pass filtering in transform domain which can reduce additive white gaussian noise and inter - carrier interference effectively
該估計演算法採用在變換域多次迭代濾波的方式，能夠顯著降低高斯噪聲和載波間干擾（ ici ）對估計性能的影響，同時快速fft演算法也使得變換域濾波變得比較簡便。 -
The principle of coding and decoding for turbo codes, including pccc, sccc and hccc, are discussed ; based on the introduction of the modified and simplified map algorithms on awgn channel for turbo codes, multiplicative and additive siso decoding algorithms adapted to general iterative decoding are derived
論述了turbo碼（包括pccc 、 sccc和hccc ）的編譯碼原理，在介紹awgn通道上用於turbo譯碼的修正map譯碼演算法基礎上系統推導了適用於級聯碼迭代譯碼的通用siso譯碼演算法。
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