rake receiver 中文意思是什麼
rake receiver
解釋
耙式接收器-
Multipath distinguish factor of rake receiver in mobile radio channels
接收機的多徑分辨系數 -
In order to utilize the resoluble ability of signals and improve resistant ability to multipath fading, the rake receiver is a good option. but proper rake operation requires information about the delays and attenuations of the channel paths which is difficult to obtain
本文以uwb通信系統為背景，主要研究uwb系統室內密集多徑通道的通道估計方法，以及基於turbo原則的迭代通道估計的接收機結構。 -
The simplified gaussian approximation can be obtained, which has almost the same in accuracy but much less calculations than improved gaussian approximation method. the single traffic cdma system in nakagami fading channel with rake receiver is investigated extensively. a closed form ber expression is obtained with arbitrary chip waveforms
由於在用戶小時其誤差大，改進高斯法可以提高精度，但需要更多的計算時間，少用戶時直擴系統的工程計演算法能夠獲得與改進高斯法相似的精度，但需要的運算量大為減少。 -
The structure of band - pass rake receiver and the model of demodulation are depicted
我們給出帶通犁耙式接收機模型及解調結構。 -
Lastly, the dissertation designs a rank - reduced blind space - time 2 - d rake receiver using time extraction which has not only the capability of space - time equilibrium but also reduces the convergence time of adaptive array and the rank of correlated matrix of the received data
最後，設計了一種時間抽取降秩盲空時2 - drake接收機。分析了其性能和參考信號的提取方法。該接收機不但具有空時均衡的能力，而且降低了陣列的收斂時間和接收數據相關矩陣的秩。 -
For the design of rake receiver, a receiving with delay and unfixed channel estimation coefficients, integrating channel estimation, capture of spread sequences and, despread, are described. its features are real - time, quick capture and easy implement
對于rake接收機，描述了一種延遲和通道估計系數均不固定的接收方式，集通道估計、擴頻捕獲、解擴功能於一身，具有實時性強、捕獲速度快、易於實現的特點。 -
Space - time processing for cdma with antenna array is investigated in this paper, which includes space - time channel estimation, beamforming technique, 2d - rake receiver, multiuser detection, space - time multiuser detection and joint estimation
本文研究了天線陣cdma系統中的空時處理技術，主要包括空時通道估計、波束形成技術、空時2d - rake接收機、多用戶檢測、空時多用戶檢測和聯合估計。 -
Section 4 researches on pilot symbol aided space - time 2d rake receiver in rayleigh fading channel. two kinds of 2d - rake receivers are proposed, one is the interference zeros force 2d - rake receiver ( zf - 2drake ). simulation results reveal zf - 2drake has the better performance than the conventional 2d - rake receiver
研究了rayleigh通道下2種導頻輔助的空時2d - rake接收機結構:干擾置零2d - rake接收機（ zf - 2drake ）和基於空時通道估計的時空級聯2d - rake接收機（ spce - 2drake ） ，推導了它們的誤碼率性能。 -
In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly. multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers. by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable
在wcdma系統中，為正確解擴解調接收到的擴頻信號，接收機本地產生的擴頻碼（ pn碼）相位必須和接收信號中的擴頻碼相位完全同步;同時移動通信環境中的傳輸信號由於接收機和發射機之間的直達路徑有可能被建築物或其他障礙物所阻礙，總是經過折射或反射的多條路徑后才到達接收機，從而產生多徑通道。 -
Discusses sa - rake technique for improving system performance, and develops four sa - rake receiver structures
提出4種應用於cdma移動終端的sa - rake級聯結構。 -
With the trend that cdma will be the dominant multi - access scheme in the new generation of wireless communication, how to apply spatial processing in cdma system has been becoming the emphasis of research in smart antenna. a proper method is space - time processing due to the space - time structure of wireless channel. beamforming can be combined with rake to form 2d rake receiver, which can effectively weaken the enhancement of mai in conventional rake receiver. however a more effective method is to use space - time filtering. these two scheme will be discussed and the structure and realization will be presented
碼分多址技術逐漸成為新一代通信系統的主流多址技術，如何在碼分多址系統中引入空域處理以改善系統性能是當前智能天線技術研究的重點之一.考慮到無線通道的時空二維結構特徵，一種合理的實現方式是採用時空處理方法，將波束形成技術與時域分集技術相結合;另一種更有效的方法是在接收端採用時空二維聯合處理，對無線通道進行時空二維均衡 -
The viterbi decoder with hard decision designed by the paper, is aimed at ( 3, 1, 9 ) convolutional coding. the data rate is 9. 6kbps. the data rate received by the rake receiver is spreaded by 127 - bit spread sequences, added pilot signals and modulated by qpsk
該課題所設計viterbi譯碼是針對（ 3 ， 1 ， 9 ）卷積碼的硬判決譯碼，數據速率為9 . 6kbps ; rake接收機所接收的數據是擴頻因子為127 、加入導頻且經qpsk調制的擴頻信號，使用verilg硬體描述語言在xilinx公司的ise環境下在用現場可編程門陣列（ fpga ）來實現viterbi譯碼器和rake接=收機的功能。 -
Finally, the application of mud in the frequency - flat slowly fading multi - path channel is introduced, and to enhance the system efficiency the joint use of the rake receiver and mud is applied in the frequency - selective slowly fading multi - path channel
最後，在討論了平坦慢衰落通道的基礎上，將rake分集技術和多用戶檢測技術相結合應用於多徑的頻率選擇性慢衰落通道，以達到改良系統的性能的目的。 -
And the pn code synchronization scheme adequate for the wcdma uplink is presented and combined with finger management, channel estimation and mrc algorithms to complete the rake receiver scheme. simulations on pd / pf and pd / ebno show the scheme has good preformance and meets the requirement of wcdma uplink in 3gpp protocols
分別採用pd / pf方法和bler / ebno方法對同步方案進行模擬，模擬結果表明，本論文提出的擴頻碼同步方案的捕獲概率和虛警概率能滿足要求，同時總體接收機方案能達到3gpp協議中上行鏈路的性能要求。 -
Finally, after some experiments about rake receiver are performed in space channels, some problems existing in the process of experiments are mentioned, and then, the simulation of fpga about the path - searching circuit is finished
最後對rake接收系統進行了空間實驗，提出了實驗中存在的問題以及需要改進的方向，並就系統中的基於bpsk擴頻假設檢驗的路徑搜索裝置進行了fpga模擬。 -
Then, introducing something about spread spectrum technique. and deciding to select direct - sequence spread spectrum ( ds ) in underwater acoustic communications by comparing ds to fh according to the properties of underwater acoustic channels. after that, discussing something about rake receiver, simulating the path - search algorithms, synchronization circuits and rake receiver in low speed underwater acoustic communications and analyzing some major factors influencing the performance of systems
然後介紹了rake接收技術的基本原理，並對rake接收系統中的路徑搜索和同步系統進行了討論和模擬分析，另外還對rake接收技術在低速水聲通信系統中的應用作了模擬分析，並討論了一些影響rake接收系統性能的主要因素。 -
The tapped delay model of the multi - path frequency selective fading channels as well as the diversity receiver technique is introduced, and the principles of rake receiver are described. then various downlink channel estimation techniques, such as simple averaging, wmsa and fbprelms are analysed in detail
本文首先討論了移動通信通道的各種參數對通道估計的影響，介紹了頻率選擇性通道的抽頭延遲線模型和分集接收技術，在此基礎上闡述了rake接收機的原理。 -
This paper studies using asic ic2001 which is zte independently - developed and dsp from ti company to finish the driver of rake receiver and symbol processing function based on 3g base band. achieving the chip mapping, resource planning, the driver of baseband realization and experimental validation with the developing tool ccs ide supplied by ti company
本文研究運用中興公司自行研發的專用集成晶元ic2001與ti公司的dsp晶元共同完成第三代移動通信（ 3g ）基帶處理上rake接收機和符號級處理功能的基帶系統驅動，在ti公司提供的開發工具ccs集成環境中完成晶元映射、資源規劃、系統驅動方案實現及進行實驗驗證。 -
Thirdly, the dissertation presents an anti - interference technology of adaptive array for non - spread spectrum signal using a pilot signal, by which a non - spread spectrum system can use the decoupled 2 - d rake receiver and the original non - spread spectrum system need not be modified
第三，提出了採用擴頻信號作為導引信號的非擴頻信號自適應陣列天線抗干擾方法。該方法使得非擴頻系統可以採用解耦合空時2 - drake接收機，而且不改變原非擴頻系統。 -
After analyzing the performance of the coherent tree - structured optimal joint detection ( tsojd ) for qpsk signals and deriving a non - coherent multi - user weight / phase estimator, the dissertation proposes a low complexity non - coherent multi - user weight / phase optimal joint detection algorithm. besides, the dissertation proposes a partial coherent multi - user / iv weight / phase optimal joint detection algorithm and some useful conclusions are obtained in comparison experiments. 4. in the research on the diversity techniques for fast fading multi - path channels, the dissertation proposes a time - scale rake receiver, and analyzes its performance with the conception of auto - wavelet - transform ( awt ) and time - - scale resolution
提出了過飽和低復雜度qpsk信號的樹型最佳聯合檢測演算法，並分析了相應最佳接收機的性能及相位偏差對性能的影響等問題；考慮了載波相位和多用戶信碼的聯合檢測問題，通過理論推導給出了過飽和多址系統中多用戶信碼/相位聯合估計子，提出了低復雜度非相干多用戶信碼/相位最佳聯合檢測演算法，並分析了此非相干最佳接收機的誤碼性能及相位提取誤差等有關問題；提出了部分相干多用戶信碼/相位最佳聯合檢測演算法，通過計算機模擬分析了該接收機的誤碼性能及相位提取誤差等有關問題，並與相干、非相干解調兩種情況作了比較，得出了一些有益的結論。
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