TAILIEUCHUNG - Digital communication receivers P1

PART B Basic Material 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 I Stationary Basic Material and Cyclostationary Processes In telecommunications, both the information-bearing transmitted signal and the disturbances introduced by the channel are modeled as random processes. This reflects the fact that the receiver knows only some statistical properties of these signals, rather than the signals themselves. From these known statistical properties and the observation of the received signal, the receiver computes an estimate of the transmitted. | 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 PART B Basic Material 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 1 Basic Material stationary and Cyclostationary Processes In telecommunications both the information-bearing transmitted signal and the disturbances introduced by the channel are modeled as random processes. This reflects the fact that the receiver knows only some statistical properties of these signals rather than the signals themselves. From these known statistical properties and the observation of the received signal the receiver computes an estimate of the transmitted information. The simplest random processes to deal with are stationary random processes. Roughly speaking their statistical properties such as the variance do not change with time but of course the instantaneous value of the process does change with time . Several channel impairments such as additive thermal noise and the attenuation of a non-frequency-selective channel can be considered as stationary processes. However the ttansmitted signal and also interfering signals such as adjacent channel interference with similar properties as the ưansmitted signal cannot be considered as stationary processes. For example the variance of an amplitude-modulated sinusoidal carrier is not independent of time it is zero at the zero-crossing instants of the carrier and it is maximum halfway between zero crossings. The transmitted signal and interfering signals with similar properties can be modeled in terms of cyclostationary processes these are processes with statistical properties that vary periodically with time. In the following we .

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