TAILIEUCHUNG - Digital communication receivers P11

Communication PART E over Fading Channels Digital Communication Receivers: Synchronization, Channel Estimation, and Signal Processing Heinrich Meyr, Marc Moeneclaey, Stefan A. Fechtel Copyright 1998 John Wiley & Sons, Inc. Print ISBN 0-471-50275-8 Online ISBN 0-471-20057-3 Chapter 11 Characterization, Modeling, and Simulation of Linear Fading Channels 11 .l Introduction In order to meet the ever-increasing need for both increased mobility and higher quality of a larger selection of services, wireless radio transmission of digital information such as digitized speech, still or moving images, written messages, and other data plays an increasingly important role in the design and implementation of mobile and personal communication systems [. | Digital Communication Receivers Synchronization Channel Estimation and Signal Processing Heinrich Meyr Marc Moeneclaey Stefan A. Fechtel Copyright 1998 John Wiley Sons Inc. Print ISBN 0-471-50275-8 Online ISBN 0-471-20057-3 rpq rAn I EZ Communication over Fading Channels Digital Communication Receivers Synchronization Channel Estimation and Signal Processing Heinrich Meyr Marc Moeneclaey Stefan A. Fechtel Copyright 1998 John Wiley Sons Inc. Print ISBN 0-471-50275-8 Online ISBN 0-471-20057-3 Chapter 11 Characterization Modeling and Simulation of Linear Fading Channels Introduction In order to meet the ever-increasing need for both increased mobility and higher quality of a larger selection of services wireless radio transmission of digital information such as digitized speech still or moving images written messages and other data plays an increasingly important role in the design and implementation of mobile and personal communication systems 1 2 . Nearly all radio channels of interest are more or less time-variant and dispersive in nature. However many electromagnetic environments . satellite or line-of-sight LOS microwave channels may often be regarded as effectively time-invariant. In such cases receiver structures including synchronizers that have been derived for static channels see the material of the preceding chapters may be applied. On the other hand when environments such as the land-mobile LM satellite-mobile SM or ionospheric shortwave high-frequency HF channels exhibit significant signal variations on a short-term time scale this signal fading affects nearly every stage of the communication system. Throughout this part of the book we shall focus on linear modulation formats. Large variations of received signal levels caused by fading put additional strain on linear digital receiver components the resolution of A D converters and the precision of digital signal processing must be higher than in the case of static channels. More importantly deep .

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