Pulse or digital communications – Transceivers – Modems
Reissue Patent
2011-01-04
2011-01-04
Lugo, David B (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C375S231000, C375S232000
Reissue Patent
active
RE042021
ABSTRACT:
A system and method for enhancing the performance of an equalizer in a modem. Multiple techniques are disclosed which improve the modem performance. A first technique uses stored parameters for each burst from each remote site to demodulate a received data stream. A second technique compensates for the gain droop caused by storing parameters across each burst. A third technique minimizes errors caused by adapting the equalizer coefficients for each data burst by analyzing the SN ratio and error rate of the received burst. A fourth technique improves the convergence of the equalizer by using a two-part preamble, whereby both parts are transmitted using different modulation techniques. A fifth technique is provided which performs a soft reset of the modem without performing a complete reset of the modem. A sixth technique determines a modem adaptation factor based on the expected modulation type of an incoming burst transmission. A seventh technique calculates a phase correction value for the stored tap values and applies the value to the incoming signal.
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Arviv Eli
Behar Jacques
Gallagher Timothy L.
Gazelle David
Pollmann Stephen C.
Lugo David B
Schwabe Williamson & Wyatt P.C.
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