Pulse or digital communications – Repeaters – Testing
Patent
1995-06-07
1997-06-17
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375350, 375371, H04B 1707
Patent
active
056404166
ABSTRACT:
A digital despreader and downconversion technique useful for spread spectrum communications receivers digitally tracks a timing phase of a PN sequence without the need for steering an external hardware clock. An additional benefit of the technique is the use of a receive filter matched to the bandlimited transmit chip sequence prior to despreading which reduces the amount of noise present after despreading. A narrowband filter also permits the use of a single A/D converter in the receiver, IF sampling at a relatively low sample rate compared to other techniques. A method for reducing a total number of computations required thereby facilitating implementation in a single custom digital integrated circuit is also described.
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Chin Stephen
Comsat Corporation
Gluck Jeffrey W.
LandOfFree
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