Pulse or digital communications – Repeaters – Testing
Patent
1991-11-18
1993-03-09
Swann, Tod
Pulse or digital communications
Repeaters
Testing
380 34, H04K 100
Patent
active
051931028
ABSTRACT:
A method and apparatus is provided for improving detection of data bits in data samples (120) of a hop of a slow frequency hopping spread spectrum signal (112). In the detecting process, the carrier to interference (C/l) power ratio of the hop is estimated (124) by using the data samples (120) of the hop. Subsequently, a data bit (130) is detected by using the estimated C/l power ratio (126). The detection process (128) may include utilizing maximum likelihood decoding techniques to derive a data bit (130) from decision metrics and the estimated C/l power ratio (126). The decision metrics correspond to a measurement of the distance of data samples (120) from constellation points within a constellation space representing data samples (120) previously used to generate decision metrics. The detection process (128) also may include utilizing the estimated C/l power ratio (126) in combining data samples (120) of the hop as received from two or more diversity receiver branches.
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Livneh Noam
Meidan Reuven
Ritz Mordechai
Silbershatz Giora
Dempster Shawn B.
Motorola Inc.
Swann Tod
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