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PART D Passband Communication Over Time Invariant 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 3 Passband Transmission In this chapterwe briefly review the fundamentalsof passband transmission over a time-invariantchannel. In Section3.1 we describethe transmission methods. In Section3.2 we introduce channeland transceivermodels. In the last sectionof this chapter we are concernedwith the fundamentalbounds of the outer receiver (seechapteron introduction andpreview), the channelcapacity. This bounddefines the ultimate transmissionrate for. | 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 D Passband Communication Over Time Invariant 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 3 Passband Transmission In this chapter we briefly review the fundamentals of passband transmission over a time-invariant channel. In Section 3.1 we describe the transmission methods. In Section 3.2 we introduce channel and transceiver models. In the last section of this chapter we are concerned with the fundamental bounds of the outer receiver see chapter on introduction and preview the channel capacity. This bound defines the ultimate transmission rate for error-free transmission. We gain considerable insight by comparing this bound with the performance of any communication system. Furthermore studying the fundamental bounds on the outer receiver performance channel capacity and that of the inner receiver variance of the parameter estimates provides a deep understanding of the interdependence between the two parts. 3.1 Transmission Methods Passband transmission of digital information can be roughly separated into two main classes noncoherent and coherent. The first class uses so-called noncoherent modulation techniques which do not require an estimate of the carrier frequency and phase. Noncoherent modulation techniques have significant disadvantages in particular a power penalty and spectral inefficiency when compared to the second class of techniques employing coherent transmission. The most commonly used member of the class of coherent transmission techniques is pulse-amplitude modulation PAM . Special cases of passband PAM are phase-shift keying PSK .