Pulse or digital communications – Repeaters – Testing
Patent
1993-09-13
1994-11-01
Gregory, Bernarr E.
Pulse or digital communications
Repeaters
Testing
380 34, 375 99, 375111, 455 63, 455 65, 455296, 455302, H04L 2730
Patent
active
053612760
ABSTRACT:
A spread spectrum receiver for use in spread spectrum communication systems is disclosed. The spread spectrum receiver of the present invention includes an analog-to-digital converter for receiving an analog spread spectrum signal, and for converting the received analog signal to a digital signal. The spread spectrum receiver also includes a digital frequency offset correction device, for modifying the digital signal in accordance with a frequency correction term signal to thereby correct for frequency offset in the received analog signal. The spread spectrum receiver also contains a Rake receiver. The spread spectrum receiver searches through the modified digital signal to identify M of the main and multipath return signals having the strongest signal strengths. The identified main and multipath return signals are processed in accordance with predetermined maximum likelihood techniques to thereby generate phase correction and maximal-ratio combining weighting factors for each of the M signals, as well as the overall frequency correction term signal.
REFERENCES:
patent: 4359779 (1982-11-01), Levine
patent: 4621365 (1986-11-01), Chiu
AT&T Bell Laboratories
Gregory Bernarr E.
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