数字接收机，很难得的英文文献，要国外的同学帮我下载的.pdf

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SYNCHRONIZATION FOR ALL DIGITAL RECEIVERS

Abstract

Contents

List of Tables

List of Figures

Ch1 Introduction

SYNCHRONIZATION FOR ALL DIGITAL RECEIVERS submitted to the department of electrical engineering a dissertation and the committee on graduate studies of stanford university in partial fulfillment of the requirements for the degree of doctor of philosophy By Daeyoung Kim Jan

I certify that I have read this dissertation and that in my opinion it is fully adequate in scope and in quality as a dissertation for the degree of Doctor of Philosophy Donald C Cox Principal Adviser I certify that I have read this dissertation and that in my opinion it is fully adequate in scope and in quality as a dissertation for the degree of Doctor of Philosophy Madihally J Narasimha I certify that I have read this dissertation and that in my opinion it is fully adequate in scope and in quality as a dissertation for the degree of Doctor of Philosophy John M Cio Approved for the University Committee on Graduate Studies iii

Abstract When data are transmitted from one location to another the receiver must recon struct the time base of the transmitter in order to convert the continuous time received signal into a sequence of data symbols Synchronization syn meaning together and chronous meaning time is the process of reconstructing this time base There are two synchronization problems encountered in passband com munication systems Symbol timing recovery and Carrier recovery Implementation of the receiver by digital techniques implies sampling of the input signal In many circumstances the sampling cannot be synchronized to the correct symbol timing of the incoming signal Digital processing of frequency multiplexed signals is an example As it is not possible to alter the sampling clock symbol timing recovery must be performed by interpolation Conventional interpolation lters to achieve this are based on continuous time functions such as the sinc function These lters are not optimal and can therefore degrade the SNR An interpolation lter optimal in a particular sense is proposed for symbol timing recovery in a digital receiver where the input analogtodigital conversion sampling clock is not synchronized to the transmitter symbol clock The optimized lter is designed by minimizing the mean square error MSE at the output of the receiver The MSE minimization procedure results in a system of linear equation which can easily be solved to yield the lter coecients The tracking performance of the syn chronization system employing this interpolation lter is also analyzed Simulation results are included to show the performance improvement realizable by employing the optimized interpolation lter iv

All digital symbol timing recovery using a lter bank and interpolators is com putationally more ecient than an oversampling technique in a multichannel FDM receiver This is demonstrated by performing a detailed analysis of the two schemes for the headend demodulator in the upstream direction in a coaxial cable system Carrier recovery is essential for the operation of a phasecoherent demodulator A new algorithm is proposed for estimating the carrier frequency oset from a block of PSK symbols Its computational complexity is comparable to existing methods but it attains the CramerRao bound down to lower input SNR values for somewhat smaller values of frequency oset v

Acknowledgements I would like to express my deepest gratitude to my research associate advisor Pro fessor Madihally J Narasimha for his valuable support and guidance Professor Narasimha provided encouragement guidance and generous support during my years at Stanford I want to thank Professor Donald Cox for serving as my advisor His insights helped me approach my research eciently and facilitated my completion of this thesis I wish to thank Professor John Cio for participating in my orals committee and for being a member of my reading committee I also thank Professor El Gamal for being the chairman of my orals committee Although Professor Allen Peterson passed away his advice has been always with me Without him I could not have started my work at Stanford I enjoyed the company and discussions with my colleagues in the wireless group Bora Akyol Sung Chun ByongJo Kim Matthew Kolz Derek Lam T Andy Lee Yumin Lee Tim Schmidl Je Stribling Daniel Wong and P Bill Wong I also wish the best of luck to my friends at Stanford Jenwei Liang Zartash Uzmi My thanks to my father and mother are beyond words Finally my greatest thanks go to my wife who has always encouraged me Without her love and sup port my work would have been much more dicult It is to her I dedicate this dissertation vi

Contents Abstract Acknowledgements Introduction Passband QPSK System All Digital Receiver Outline of the Dissertation Contributions Interpolation Filters Introduction iv vi Conventional Interpolation Filters Optimal Interpolation Filters Design of Optimal Interpolation Filters Simulations Conclusions Tracking Performance Introduction Bias and variance of the timing error detector Bias Variance Jitter energy vii

Simulations When T Ts is close to an integer When T Ts is not close to an integer Conclusions Applications Introduction System Model Implementation Methods Direct Implementation Filter Bank Implementation Better Implementation without Interpolator Is Impossible Numerical Example Application of the Optimal Interpolation Filter Conclusions Carrier Recovery Existing Algorithms DataAided or DecisionDirected Algorithms NonDataAided Algorithms Proposed Algorithm Proposed DA algorithm Proposed NDA Algorithm Simulations Conclusions Conclusions Summary of Results Topics for Future Research A Bias and Variance of a Timing Error Detector A MM timing error detector A Gardners timing error detector viii

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数字接收机，很难得的英文文献，要国外的同学帮我下载的.pdf

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