TAILIEUCHUNG - Digital communication receivers P4

Receiver Structure for PAM Signals In this chapter we first discuss the main building blocks of a digital receiver (Section ). The discussion is intended as an introduction to get a qualitative understanding of the design issues involved. In Section we are concerned with the question under what conditions the samples of the received signal contain the entire information on the continuous-time signal. The samples obtained under such conditions provide so-called sufficient statistics for the digital receiver to be discussed in Section . Here we systematically derive the optimum receiver based on the maximum-likelihood criterion, The essential feature of. | 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 4 Receiver Structure for PAM Signals In this chapter we first discuss the main building blocks of a digital receiver Section . The discussion is intended as an introduction to get a qualitative understanding of the design issues involved. In Section we are concerned with the question under what conditions the samples of the received signal contain the entire information on the continuous-time signal. The samples obtained under such conditions provide so-called sufficient statistics for the digital receiver to be discussed in Section . Here we systematically derive the optimum receiver based on the maximum-likelihood criterion. The essential feature of our approach is that the receiver structure is the outcome of a mathematical optimization problem. Functional Block Diagram of a Receiver for PAM Signal This section examines the main building blocks of a data receiver for the purpose of exposing the key functions. It is intended as an introduction for the reader to get a qualitative understanding of the design issues involved which will be discussed in detail in later sections. As in all receivers the input is an analog signal and the output is a sequence of digital numbers one per symbol. A typical block diagram of an analog receiver is shown in Figure 4-1. Analog-to-digital conversion A D takes place at the latest stage possible namely immediately before the detector and decoder which is always implemented digitally. The other extreme case is a fully digital receiver shown in Figure 4-2 where the signal is A D converted to baseband immediately after downconversion. The adjective typical should be emphasized in both cases as many variations on the illustrated block diagrams are possible. For example In a hybrid receiver .

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