Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-12-31
2011-10-18
Tran, Tuan A (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S450000, C455S025000, C455S063100, C455S296000, C455S561000, C455S562100, C455S114200, C455S500000, C455S502000, C370S436000, C375S296000, C375S346000, C375S347000
Reexamination Certificate
active
08041363
ABSTRACT:
The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that will minimize the probability of interfering with existing legacy users. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at a multiplicity of transceivers in a wireless network. The invention also provides closed loop feedback control between nodes, co-site interference management, intersymbol interference mitigation, wide sense stationary baseband signaling and modulation, and power limited signaling for avoiding detection and interception.
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Raytheon BBN Technologies Corp.
Ropes & Gray LLP
Tran Tuan A
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