Examples of Digital Baseband Transmission Systems

  • Jan W. M. Bergmans


Digital transmission and recording systems invariably transport information across a band of restricted width. The center frequency of this band may be high with respect to the band width, as it is in radio transmission. It may also be of the same order of magnitude or even zero, as in cable transmission and digital recording. In the first case the information must be modulated on to a carrier in order to convert it into the passband. In the second case this step is, in principle, not needed. The adjective ‘baseband’ serves to indicate that no carrier modulation is used. Instead, baseband transmission systems typically use a modulation code to match the characteristics of the data to those of the channel. At the receiving end of the system, equalization, detection, timing recovery and adaptation techniques are combined to recover the data. In the forthcoming chapters we discuss all these subjects. By way of introduction and motivation, the. present chapter gives a survey of three important application areas of digital baseband transmission, namely digital subscriber lines, digital magnetic recording and digital optical recording. The aim is to convey a flavor of the origin, nature and importance of the various transmission impairments that arise, to exemplify some of the techniques that exist to prevent and/or counteract them, and to show that the principal types of impairment are common to all systems. For future reference we also model some of the impairments analytically. We should stress that the present survey is only meant as an introduction to the various application areas. As such it is restricted both in scope and in depth. Section 2.5 lists several references that provide much more complete treatments.


Modulation Transfer Function Hard Disk Drive Impulse Noise Magnetic Record Modulation Code 
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Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • Jan W. M. Bergmans
    • 1
  1. 1.Philips ResearchEindhovenThe Netherlands

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