Systems and methods for optimizing timing phase in modem devices
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United States of America Patent
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Oct 7, 2014
Grant Date -
Oct 2, 2003
app pub date -
Mar 29, 2002
filing date -
Mar 29, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods are provided for performing the required phase calculation in a telecommunications system in order to optimize system performance more quickly and with reduced complexity as compared to prior approaches to solving this problem. In accordance with the preferred exemplary embodiment of the present invention, the phase delay of the precursor equalizer (EQ) is calculated off-line and as a result it is not necessary to fill the precursor EQ delay line with the indicated number of symbols as in the previous approach. Additionally, because the precursor EQ is fractionally spaced, both sine and cosine values of the 4kHz tone's initial phase can be achieved simultaneously. As a result, only 36 quick timing sequence (QTS) symbols are needed in order to perform the required estimation.
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