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Noncoherent Symbol Synchronization TechniquesTraditional methods for establishing symbol synchronization (sync) in digital communication receivers assume that carrier sync has already been established, i.e., the problem is addressed at the baseband level assuming that a 'perfect' estimate of carrier phase is available. We refer to this approach as coherent symbol sync. Since, for NRZ signaling, a suppressed carrier sync loop such as an I-Q Costas loop includes integrate-and-dump (I and D) filters in its in-phase (1) and quadrature (Q) arms, the traditional approach is to first track the carrier in the absence of symbol sync information, then feed back the symbol sync estimate to these filters, and then iterate between the two to a desirable operating level In this paper, we revisit the symbol sync problem by examining methods for obtaining such sync in the absence of carrier phase information, i.e., so-called noncoherent symbol sync loops. We compare the performance of these loops with that of a well-known coherent symbol sync loop and examine the conditions under which one is preferable over the other.
Document ID
20090019043
Document Type
Conference Paper
External Source(s)
Authors
Simon, Marvin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
October 17, 2005
Subject Category
Communications And Radar
Meeting Information
Military Communications Conference (MILCOM)(Atlantic City, NJ)
Distribution Limits
Public
Copyright
Other
Keywords
digital communications
noncoherent symbol sync loops
coherent symbol sync
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