Method and apparatus for securing wireless communications
First Claim
1. A method for securing wireless communications, the method comprising:
- encoding a cover message using a first modulation scheme to generate cover message symbols;
encoding a watermark message using a second modulation scheme to generate watermark message symbols;
overlaying the watermark message symbols onto the cover message symbols to generate a watermark-embedded cover message; and
transmitting the watermark-embedded cover message over a channel of an air interface.
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Accused Products
Abstract
A method and apparatus for securing wireless communications are disclosed. A watermark message is encoded to watermark message symbols. A cover message is encoded to cover message symbols. The watermark message symbols are then overlaid onto the cover message symbols to generate a watermark-embedded cover message in a physical layer. The watermark message symbols have a substantially lower amplitude than the cover message symbols. Thus, the watermark message introduces small perturbation around the constellation points of the cover message symbols. The watermark message symbol may span or spread over a plurality of cover message symbols and may be encrypted with a secret key. The watermark message is used for improving receiver performance by transmitting additional information or for security enhancement purposes. The watermarking function may be selectively turned on and off.
31 Citations
55 Claims
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1. A method for securing wireless communications, the method comprising:
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encoding a cover message using a first modulation scheme to generate cover message symbols;
encoding a watermark message using a second modulation scheme to generate watermark message symbols;
overlaying the watermark message symbols onto the cover message symbols to generate a watermark-embedded cover message; and
transmitting the watermark-embedded cover message over a channel of an air interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A transmitter for securing wireless communications, the transmitter comprising:
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a watermark encoder configured to encode a cover message using a first modulation scheme to generate encoded cover message symbols, to encode a watermark message using a second modulation scheme to generate watermark message symbols, and to overlay the watermark message symbols onto the cover message symbols to generate a watermark-embedded cover message; and
a transmit processor configured to transmit the watermark-embedded cover message over a channel of an air interface. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A receiver for securing wireless communications, the receiver comprising:
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a receive processor for processing a watermark-embedded signal;
a cover message decoder for processing an output generated by the receive processor to generate an estimated cover message; and
a watermark decoder for processing the output generated by the receive processor to generate an estimated watermark message based on the estimated cover message. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification