問道於盲 的英文怎麼說
中文拼音 [wèndàoyúmáng]
問道於盲
英文
ask the blind the way; ask the way from a blind man -- seek advice from one who can offer none; ask advice from an ignorant person; blind leading the blind-
The original infomax is only applied in the instantaneous mixture and in the single channel blind deconvolution. this thesis applies the idea to blind sources separation in multiple channel convolutive mixture. through simulation, we can show that the algorithm has good performance
Infomax演算法適用於瞬時混合情況下的盲分離和單通道盲解卷積問題，本文將infomax演算法推廣到多通道卷積混合，對演算法進行模擬，取得了不錯的效果。If the blind lead the blind, both shall fall into the ditch
問道於盲，無益於事。The following algorithms have been proposed and tested in the thesis : 1 frequency selective fading : combine the isomorphism between the input space and the output space and propose a new approach to blind equalization of the channel. compared with conventional methods, the new approach offers lower computational complexity, better performance, and more robust against the over - determination of the system order ; 2 time selective fading : a new approach to the equalization of time selective channel based on the zero - forced equalizer is proposed which is more simple in its structure of algorithm ; 3 time - varying channel : using the instantaneous mean value changes of the output signal to extract the information of channel variations and model it using ar model, kalman filter is then employed to track channel variations, it bears faster ability in tracking the variation of tv channels ; based on the isomorphism between the inputs and the outputs and some of the approaches using in mimo system, a new algorithm of equalization of simo time - varying channel is proposed, which also share the merits of being robust against the over - determination of the system order ; model the time - varying channel using the multi - resolution decomposition wavelets, and then a blind identification method based " on the model is proposed ; at last, a new model for equalization and identification of mimo system is proposed
主要工作在以下幾個方面： 1 、針對頻率選擇性衰落通道：結合輸入輸出空間同構關系提出一種新的頻率選擇性通道均衡方法，與傳統方法相比，該方法計算量更小，收斂速度更快，性能更優，且對系統階次的過確定表現穩健，具有實際均衡應用價值； 2 、針對時間選擇性衰落通道：提出一種基於迫零均衡的時間選擇性通道均衡方法，演算法結構簡單； 3 、針對時變色散通道：利用瞬態均值曲線提取通道時變信息，對之ar建模，利用卡爾曼濾波器跟蹤時變通道抽頭變化，可以快速跟蹤通道變化；基於輸入輸出空間之間的同構關系以及多輸入多輸出系統的處理方法，提出了新的單輸入多輸出色散時變通道均衡與識別演算法，同樣具有對通道階次過確定保持穩健的優點；結合小波多解析度分析提出一種基於小波模型的通道盲識別演算法；研究時變的多輸入多輸出系統的盲均衡與盲反卷積問題，給出一種時變系統處理模型。3 a novel recursive least - square ( rls ) blind space - time receiver algorithm based on the constrained condition, which can completely avoid the matrix inversion introduced into by constraints ( comparing with the normal rls ), is proposed for multi - path slow fading cdma channels. the computational complexity of this method is not only lower than that of the normal rls, but also lower than that of both lms and ls blind space - time receiver methods that are realized based on the rosen ' s gradient projection. and the speed of convergence of the presented rls blind space - time receiver algorithm is better than that of both lms and ls blind space - time receiver methods
3 、針對多徑慢衰落通道下ds - cdma盲空時接收機中線性約束二次規劃問題提出一種新的遞歸最小二乘演算法，該演算法完全避免因約束而引進的矩陣求逆運算（相對于常規的遞歸最小二乘演算法） ，不但運算量比常規的要低，而且比基於rosen梯度投影實現的最小均方（ lms ）與最小二乘盲空時接收機演算法還低，且收斂速度比基於rosen梯度投影實現的最小均方（ lms ）與最小二乘盲空時多用戶檢測都好，將提出的新的遞歸最小二乘演算法與提出的數據選擇方案結合起來可以進一步降低其運算量，具有很大的實用價值，最後通過模擬實驗進一步分析了其性能。Firstly, a new joint filterbank precoders and decision feedback equalizers structure is proposed, and the corresponding optimization result based on the maximal mutual information criterion is derived. secondly, the concept of dt canonical model is proposed, which is very suitable for the task of blind signal processing based on the second - order statistical of the observations. thirdly, the methods of blind equalization and identification of the tv dispersive channels are researched systematically based on the proposed dt canonical model, and a subspace blind identification algorithm of the time - invariant channel matrix is developed
本文創新性的成果在於：提出了預編碼-判決反饋聯合均衡系統結構，並從理論推導得出了對應的最大互信息量最優化設計結果；首次提出了時變色散通道的離散正則模型概念，該模型適宜於利用觀察數據的二階統計量進行盲信號處理；基於離散正則模型對時變色散通道進行了系統的盲均衡和盲辨識方法研究，提出了對時不變通道矩陣的子空間盲辨識演算法；針對誤差傳播效應問題，提出了可以消除誤差傳播效應的兩級盲辨識演算法；提出了基於離散正則模型的直接盲均衡演算法；提出了基於特徵恢復思想的神經網路直接自適應盲均衡演算法。According to wireless and mobile communication system ' s background, this thesis study on estimation of time - varying dispersive channel from four respects : ( 1 ) aid of pilots, ( 2 ) cyclic prefix ( cp ), ( 3 ) blind method, and ( 4 ) ofdm system with multiple transmitting antenna, in which the typical ways is decision - feedback algorithm and self - adaptive block algorithm
本文以無線和移動通信系統為背景，從四個方面對時變色散通道下的ofdm系統的通道估計和均衡問題進行了研究。第一是基於導頻符號的通道估計方法，第二是基於循環前綴的通道估計方法，第三是通道的盲估計方法，第四是基於多天線ofdm系統的通道估計和均衡方法的研究。On the basis of analyzing above investment environment and important events occurred in the industry of foundation, this article brings up the following problems emerging from the operation process of foundation. firstly, the author stressed the moral crisis of the fund industry ; and hidden dangers are still existing in the internal control system of fund management companies ; industrial supervision is far from enough. the industry lacks a system of competition and inspiration ; the styles of investment fund are tedious and monotonous
基於以上的投資環境為前提，通過對這幾年中基金投資業內重大事件的回顧和分析，本文提出了以下在投資基金運作過程中存在的主要問題： 「基金黑幕」引出了整個行業的從業道德信用危機；基金管理公司內部在內控制度上存在的隱患；行業監管力度遠遠不夠；行業缺乏競爭機制和激勵制度；基金投資理念缺乏個性及獨立性，甚至有些盲從性；投資基金風格的單調和無個性，等等。The main advantageous features of this project lie in the fact that it has resolved the problems of the lomw base stations, such as limited coverage areas, few channels, poor signal on high way and in high speed car, easily turn off and frequently switch etc. the processing response of 500mw base station instead of 10mw base - station, has effectively accounted for nearly all of the relative defects
本方案解決了西安pas網路由於開始採用10mw基站，所引起的單基站覆蓋范用小，通道少，特別在中、高速行駛的車輛上，手機容易產生切換頻繁、掉話率高等問題，同時在覆蓋范圍內盲區較多、信號質量較差，給用戶通話造成一定影響。From the analysis of the three typical forms of marketing channel in produce, which are marketing channel primarily by the transportation and sale of produce, marketing channel primarily by sold between the multi - layered brokers and marketing channel primarily by the transaction through interior relations. it comes to the problems we have in the produce marketing channel, such as the channel cost staying at a high level caused by the low technical level, the inflexible information circulation and outdated management, the main body on the up channel lacking competitive power caused by the universal low cultural quality, the ineffective information and blindly following others, the low technology content of the channel, the unreasonable investment structure
從對我國以農產品運銷為主的營銷渠道、以多層中間商銷售為主的營銷渠道和以交易型渠道內部關系為主的營銷渠道三種典型農產品營銷渠道的分析中，得出了我國農產品營銷渠道體系存在的問題，如:由於技術水平低下、流通信息不靈、管理方式陳舊導致渠道成本居高不下;由於文化素質普遍偏低、信息不靈、盲目跟風致使渠道上游主體缺乏競爭力;渠道技術含量較低;投資結構不合理。The problem of signal processing for direct - sequence code - division - multiple - access ( ds - cdma ) signal over multipath frequency - selective mobile channels is considered. a new blind receiver is proposed. without the knowledge of the multiple - access interference users spreading code and the channel characteristics, the receiver achieves blind detection with prior knowledge of only the desired users spreading code and approximate timing. by using reduced rank adaptive decorrelating filter and adaptive multipath combiner which is based on decision - directed algorithm, the receiver gets the ability to combat both fading and the near - far effect at low cost. simulation results demonstrate that the proposed receiver offers high performance
本文研究多徑頻率選擇性衰落通道下直接序列擴頻碼分多址（ ds - cdma ）信號的處理問題，提出了一種新型的盲接收機.該接收機不需預知多址干擾用戶的擴頻碼，不需預知通道參數，只需已知期望用戶的擴頻碼和粗略的定時，就可以完成用戶的盲檢測.同時，該接收機通過降維自適應去相關濾波和基於判決指導的自適應多徑合併，來獲得低成本和良好的抗衰落、抗遠近效應性能.模擬結果驗證了本文提出的接收機的優良性能Take the hoc based blind modulation detection algorithm as an example, the relationship between the blind modulation detection algorithm and synchronization is investigated. an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization. how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
研究了載波同步和碼元定時同步與調制方式盲檢測演算法的關系；以自適應單載波中高階累積量調制方式盲檢測演算法為例，對于載波同步誤差引起的頻偏問題，提出一種基於頻偏穩健的mdpsk信號調制方式盲檢測演算法；對于未知調制方式信號的定時同步問題，提出一種盲定時估計演算法，該演算法可以估計mdpsk和mqam信號的定時同步信息，實現數字信號的同步分類；提出了一種基於調制方式盲檢測的自適應接收機結構，把調制方式盲檢測，信噪比估計和同步解調聯合起來進行，實現調制方式隨通道質量而自適應變化的信號的正確接收。This thesis studies in adaptive equalization problems, and put the emphases in various adaptive equalizers, channel model, etc. finally, the performance of the presented blind equalizer which are used in digital microwave radio channel are compared and evaluated. the results are of great important in the development of more spectral efficient digital microwave radio - links. the focus is set on low - complexity adaptive equalizers for implementation in digital microwave radio systems
本文圍繞著自適應均衡技術進行了深入的探討，重點研究了自適應均衡演算法、通道模型等問題，並針對幾種盲均衡演算法應用於數字微波無線通道的均衡性能進行了模擬和比較，其結果對于開發具有更高頻譜利用率的數字微波通信鏈路有著重要的指導意義。分享友人