Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-05-29
1994-04-19
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
375 38, 375 40, 375 67, H04B 710, H04L 102, H04L 2728, H04K 110
Patent
active
053053532
ABSTRACT:
The invention provides a method and apparatus for transmitting digital signal information to a receiver using a plurality of antennas. The invention involves applying a channel code to a digital signal producing one or more symbols. A plurality of symbol copies is made and each copy is weighted by a distinct time varying function. Each antenna transmits a signal based on one of the weighted symbol copies. Any channel code may be used with the invention, such as a convolutional channel code or block channel code. Weighting provided to symbol copies may involve application of an amplitude gain, phase shift, or both. The present invention may be used in combination with either or both conventional interleavers and constellation mappers.
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AT&T Bell Laboratories
Kobayashi Duane
Kuntz Curtis
Restaino Thomas A.
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