Basics of Timing Recovery

  • Jan W. M. Bergmans


So far we have assumed that the receiver knows the ideal decision instants to infinite precision. In practice this will not be true, and a local time-base must be established by means of a hierarchy of synchronization mechanisms. For carrier-modulated transmission systems this hierarchy starts with carrier synchronization. This concerns the generation of a reference carrier with a phase closely matching that of the modulated data signal. Next in line, and first for the baseband transmission systems considered here, is timing recovery (also called clock recovery or bit synchronization), which serves to recover a clock at the symbol rate that is phase-locked to the incoming data. The final task is block synchronization, sometimes subdivided into word-, frame- and packet- synchronization. Here the objective is to look for the start of a message or to break the data stream into constituent parts. This is usually accomplished by embedding predefined patterns into the data stream; these can be detected by means of correlation techniques. Carrier and block synchronization are beyond the scope of this text; we refer to [15], [62], [19], [58], [35, ch. 14] and [6], [42], [13, ch. 10], respectively, for a review. Timing recovery is the subject of this chapter and the two following ones.


Timing Recovery Power Spectral Density Incoming Signal Loop Filter Initial Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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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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