Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-09-03
1993-09-28
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
375 13, 375 14, 375 16, 36472405, 364,15, 36472417, 3647242, H04B 110, H03K 5159
Patent
active
052492052
ABSTRACT:
A received time division multiple access (TDMA) signal having a time slot comprised of a plurality of symbols including at least one sequence of synchronizing symbols and a plurality of data symbols is demodulated by adaptively filtering the received signal to minimize inter-symbol interference due to an effect of channel signal propagation delay. The adaptive filtering step is performed by processing the received signal with a multi-stage lattice decision feedback equalizer having (M=N.sub.1 -N.sub.2) stages followed by (N.sub.2 -1) two-dimensional stages. A metric is next formed for each of the stages in accordance with a predetermined mathematical relationship between the output signals of each of two stages. A plurality of the formed metrics are next accumulated over a plurality of time slots. A number of stages are then recursively determined for the lattice decision feedback equalizer for use during the next time slot by comparing, to a threshold value, the difference between the values of two accumulated metrics.
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Anderson John B.
Chennakeshu Sandeep
Narasimhan Anand
General Electric Company
Kuntz Curtis
Snyder Marvin
Tse Young
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