Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2005-11-08
2009-06-30
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S147000, C375S148000, C375S254000, C375S346000, C375S347000
Reexamination Certificate
active
07555031
ABSTRACT:
A receiver system that receives and recovers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source. The digital data has a duration of data frames compacted then replicated to form duplicated time compressed data frames. The duplicated time compressed frames of data are transmitted to a communication receiver that has a time diversity data recovery circuit. The time diversity data recovery circuit buffers the received compressed and replicated data frames, evaluates whether each of the duplicated time compressed data frames are received correctly. If any one of the duplicated time compressed data frames is destroyed, the copy of the destroyed duplicated time compressed data frame is used to recover the data frame.
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Chan Chee Oei
Chua Beng Huat
Ackerman Stephen B.
Fan Chieh M
FreeSystems Pte. Ltd.
Knowles Billy
Lee Siu M
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