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US 2011/0033051 A1Published application
Method and apparatus for reducing probability of detection, improving jamming resistance and security for broadband wireless systems
AssigneeNortel Networks Limited
InventorsDavid Steer, Marcus Leech
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Abstract
Systems and methods for generating OFDM signals are provided in which sub-carrier usage is selected and/or remapped in various manners. For example, in some embodiments remapping using a security sequence is employed; in other embodiments, decoy sub-carriers are employed; in other embodiments, mask sub-carriers are used to cover jammed portions of a channel.
Claims20
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A method comprising:
- generating an OFDM signal decoy and mask sub-carriers in which the modulation of the decoy and mask sub-carriers is coded to at least partially suppress the spectral signature of the transmission at the modulation and framing rate and to make the composite signal appear as a white noise signal;
- the method further comprising applying modulation of the decoy and mask sub-carriers at a different rate than the users data symbols to assist in suppressing the modulation spectral components.
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A system comprising:
- at least one transmitter configured to:
- generate an OFDM signal decoy and mask sub-carriers in which the modulation of the decoy and mask sub-carriers is coded to at least partially suppress the spectral signature of the transmission at the modulation and framing rate and to make the composite signal appear as a white noise signal;
- and
- apply modulation of the decoy and mask sub-carriers at a different rate than the users data symbols to assist in suppressing the modulation spectral components;
- at least one receiver configured to:
- receive a signal generated by the transmitter;
- and
- apply reverse operations to recover transmitted content.
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Dependencies are inferred from the claim text.