Pulse or digital communications – Repeaters – Testing
Patent
1995-07-31
1999-03-16
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375347, 455135, 4552772, H04B 708, H04L 106, H04K 100
Patent
active
058839216
ABSTRACT:
A digital data radio receiver and method evaluates a data signal preamble received on an antenna to determine whether the antenna should receive the data signal following the preamble. The receiver determines frequency offsets from a desired frequency for each symbol in a block of symbols in the preamble, determines the variance of the frequency offsets, determines the average magnitude of the symbols in the block of symbols, where the determination of average magnitude may be performed in parallel with the determination of variance of the frequency offsets, and evaluates the variance and the average magnitude for the block of symbols to determine whether the preamble is actually noise and to assess reception quality at the antenna. In a two antenna diversity receiver system, these steps may be performed first on a block of symbols received at one antenna and then performed on the next block of symbols received at another antenna. This provides two evaluations that may be compared to select the antenna with the best reception.
REFERENCES:
patent: 4485358 (1984-11-01), Andren et al.
patent: 5131006 (1992-07-01), Kamerman et al.
patent: 5621770 (1997-04-01), Zastera
patent: 5648992 (1997-07-01), Wright et al.
Andren Carl Frank
Fakatselis John Christ
Lucas Leonard Victor
Snell Jim
Harris Corporation
Luther William
Pham Chi H.
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