multipath effect 中文意思是什麼
multipath effect
解釋
多次反射效應-
Because the hybrid acquisition scheme ( combines parallel search with serial search ) based on the correlator provides the flexibility in the trade - off between the mean acquisition time and system complexity and is easy to implement, it ? focus on the scheme here. on the other hand, this paper analyzes the effect of multiple access inference ( mai ) on the code acquisition performance for the multipath fading channels
基於相關器解擴的串-並混合方案由於有著可在平均捕獲時間和電路復雜程度（這是捕獲電路的兩個重要指標）這兩個技術指標間靈活折衷的優點和易於實現的特點，本文的重點就放在該方案中。 -
The effect of multipath, which can not be removed through differential gps positioning, is studied in theory exceptionally. at the same time, the dgps and rtk are constructed, and a lot of dgps and rtk positioning data are collected
2 ）分析了影響gps定位精度的各種因素，深入研究了差分系統無法消除的多徑效應；構建了dgps和rtk系統，採集了大量觀測數據。 -
The land clutter is useless signals for target detection caused by land terrain. the multipath effect is some kind of interference which is caused by wave reflection on terrain. the diffraction effect is the phenomenon of wave propagation into shadow region
地雜波是由地面散射引起的對目標探測無用的信號;多路徑是由電磁波在地面反射所引起的干涉;衍射則是電波繞射傳播到遮蔽區的現象。 -
Modeling and calculating of multipath effect of low angle tracking for a monopulse radar
某精測雷達航路異常值處理方法改進研究 -
Underwater acoustic communications ( uwa ) are made difficult by the combined effect of multipath propagation and high temporal and spatial variability of the channel conditions. the fading which was caused by multipath propagation was one of the main factors influencing the performance of underwater acoustic communication systems
水聲通道中廣泛存在的多徑傳播效應是水聲通信所面臨的主要障礙之一，由多徑所產生的信號衰落效應是影響水聲通信系統性能的主要因素之一。 -
This paper concentrates on the orthogonal frequency division multiplexing ( ofdm ) technique and some techniques to resist multipath fading. eliminate isi through use of a cyclic prefix. diversity techniques. using adequate ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading
本文研究了ofdm的基本原理及抗多徑衰落的一些措施，如加循環前綴，利用多徑進行分集接收，將ofdm與通道編碼及交織結合起來，頻域均衡。 -
Cdma ( code division multiple access ) is a promising technology for future mobile communication system because of its several features with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust anti - multipath effect, macro diversity, mitigating interference, soft capacity, low power, soft handoff, simple frequency design, easy access, and so on
碼分多址接入（ cdma : codedivisionmultipleaccess ）方式以頻譜利用率高、抗多徑、抗干擾、軟容量、低功率、軟切換、宏分集、頻率規劃簡單、用戶接入方便等其它多址技術不可比擬的優越性被認為是未來移動通信系統的理想接入技術之一。 -
Cdma ( code division multiple access ) is one of the promising technology for futufe mobile conununication system because of its several featurs with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust ani - multipath effect, macro diversity mitigating intefference, soft capacity low powet, soft handoff simple frequency design, easy access, and so on
碼分多址接入（ cdma ： codedivisionmultipleaccess ）方式以頻譜利用率高、抗多經、抗干擾、軟容量、低功率、軟切換、宏分集、頻率規劃簡單以及用戶接入方便等其它多址技術不可比擬的優越性被認為是未來移動通信系統的理想接入技術之一。 -
With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )
但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。 -
Be based upon the studies of sea optical scatter channel by use of monte carlo simulation, the channel is described as a multipath routeway in this paper. the effect on the communications performance, created by the frequency selectivity decline caused by the multipath routeway, is worked over. the correlation bandwith of sea optical scatter channel is analyzed and quantified through the simulation on the computer
基於對海水通道的蒙特卡羅模擬，本文對海水通道進行了多徑化描述，研究了由於通道的多徑化所產生的頻率選擇性衰落對通信質量的影響，分析並通過計算機模擬確定了海水通道的相關帶寬。 -
This article sets forth the orientation theory of digital television and radio signals ' space position, speed, clock error and etc. and then analyses the error, troposphere delay, multipath and shelter domine effect, relying on the creation of hypodistance arithmatic model and the deduction of calculation formulae
摘要文章通過建立偽距數學模型，推導整理出計算公式，從而對數字電視廣播信號的空間位置、速度和時鐘偏差等參數的定位原理進行了闡述，最後對誤差、對流層延遲、多徑和遮擋效應等進行了分析。 -
Multipath acquisition decide the coarse pn code phase and pick up the available multipath components. following, code tracking confirm the pn code phase precisely and track every multipath component ' s delay drifting due to doppler effect. in this paper, the code tracking technique in spread spectrum communication is introduced
本論文首先介紹了在擴頻通信中採用的同步跟蹤技術，結合wcdma上行鏈路的特點，提出了適合wcdma上行鏈路的pn碼跟蹤方案，並與現有的多徑搜索和通道估計演算法構成完整的上行鏈路rake接收機方案。 -
With regard to the multipath effect which is a more complicated problem in pseudolite application, a project in which pseudolites is rounding on a flat is brought forward to mitigation the multipath effect this paper, and it have been making some analysis and simulations on this project
對目前偽衛星技術應用中較為棘手的多徑問題，本文提出一種偽衛星轉動的方案來減輕多徑干擾，並進行了性能分析和模擬。 -
The nature of the multipath effect ( mpe ) has decided that phenomenon that the longer the working distance is adopted, the worse the multipath effect ( mpe ) plays the role. the new methods should be studied and employed to eliminate or mitigate the negative resulted by multipath effect ( mpe )
由多途徑效應產生的機理可知，通信距離的拓展將使多途徑效應的影響更加嚴重，所以必須研究水聲通信中抗強多途徑干擾的各種可能措施。 -
The effect of multipath propagation commonly exists in the underwater acoustic channel and the fading which was caused by multipath propagation was the main influence factor of underwater acoustic communication system
水聲通道中廣泛存在著多徑傳播效應。由多徑傳播引起的信號衰落現象是影響水聲通信系統性能的主要因素。 -
Cdma is a promising technology for future mobile communication system because of its several features with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust anti - multipath effect, macro diversity, mitigating interference, soft capacity, low power, soft handoff, simple frequency design, easy access and so on
方案二從獨立分量分析與傳統盲多用戶檢測器的結合性上考慮，即用一種子空間mmse檢測演算法的輸出來初始化ica演算法的權向量，進而利用修正fastica分離演算法對其進行迭代直至滿足要求。 -
Ofdm combined with channel coding ( cofdm ) can enhance the ability to lower the effect of multipath fading. 2
通道編碼與ofdm的結合（ cofdm ） ，增強系統進一步提高消除多徑影響的能力； 2 -
Due to multipath effect, multiple access interference ( mai ), near - far effect, and mainly the non - li ne - of - sight ( nlos ) propagation, the errors in the estimated location parameters and position location occur
在cdma蜂窩網的定位中，引起定位參數估計誤差與定位誤差的因素有非視距傳播效應、多徑傳播效應、多址干擾及遠近效應。 -
Direct sequence spread spectrum ( dsss ) communication systems have the characteristics of wide spectrum, low working signal - to - noise ratio ( snr ), anti - interference, anti - multipath effect, capability of cdma, lpi and lpd
直接序列擴頻（英文簡稱dsss ）通信具有頻譜寬、工作信噪比低、抗干擾和抗多徑效應能力強、可實現碼分多址、低截獲和低檢測概率等特點。 -
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
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