Pulse or digital communications – Repeaters – Testing
Patent
1995-10-24
1997-09-23
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375206, 375367, H04B 1500, H04K 100, H04L 2730
Patent
active
056712472
ABSTRACT:
Interference removal in spread spectrum signals, comprises the steps at a spread spectrum transmitter (10) of spreading information across a predetermined spectrum by phase modulating a repeating noise sequence (18), providing a spread spectrum signal and transmitting the spread spectrum signal. The method further comprises the steps at a receiver of receiving the spread spectrum signal along with interference (41) multiplying (42) the spread spectrum signal along with interference by a window function (44) providing a multiplied spread spectrum signal. The information is recovered by despreading the multiplied (48) spread spectrum signal using a reciprocal (50) of the spectrum of the repeating noise sequence to obtain a data spectrum with interference and subsequently normalize (52) to obtain a clean data spectrum. Alternatively the information can be recovered by substituting a corrupted magnitude spectrum with a prestored PN sequence magnitude spectrum (70) as shown by receiver (60).
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Gehman John B.
Souissi Slim
Chin Stephen
Meles Pablo
Motorola Inc.
Vo Don
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