Secure Transmissions Of Narrowband Digital Signals
First Claim
1. A communications network comprising:
- a transmitter that (i) converts an outgoing data stream into an outgoing sequence of symbols corresponding to a symbol constellation, (ii) applies a sequence of random rotations to the outgoing sequence of symbols to generate an outgoing sequence of rotated symbols, and (iii) transmits outgoing signals based on the outgoing sequence of rotated symbols; and
a receiver that (i) receives incoming signals based on the transmitted outgoing signals, (ii) recovers an incoming sequence of rotated symbols from the incoming signals, (iii) applies a sequence of de-rotations based on the sequence of random rotations to the incoming sequence of rotated symbols to generate an incoming sequence of de-rotated symbols, and (iv) recovers an incoming data stream from the incoming sequence of de-rotated symbols.
4 Assignments
0 Petitions
Accused Products
Abstract
At one node in a wireless communications network, a transmitter (i) encodes an outgoing data stream as a sequence of outgoing symbols of a symbol constellation, (ii) applies a sequence of random rotations to the outgoing symbols to generate an outgoing sequence of rotated symbols in the same symbol constellation, and (iii) transmits wireless signals based on the rotated symbols. At another network node, a receiver, having knowledge of the sequence of random rotations, (i) recovers an incoming sequence of rotated symbols from the received wireless signals, (ii) applies a corresponding sequence to de-rotations to the recovered rotated symbols to generate a sequence of de-rotated symbols, and (iii) decodes the de-rotated symbols to recover an incoming data stream that is ideally identical to the outgoing data stream. An eavesdropping node in the network that does not have knowledge of the sequence of random rotations is unable to recover meaningful data.
14 Citations
18 Claims
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1. A communications network comprising:
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a transmitter that (i) converts an outgoing data stream into an outgoing sequence of symbols corresponding to a symbol constellation, (ii) applies a sequence of random rotations to the outgoing sequence of symbols to generate an outgoing sequence of rotated symbols, and (iii) transmits outgoing signals based on the outgoing sequence of rotated symbols; and a receiver that (i) receives incoming signals based on the transmitted outgoing signals, (ii) recovers an incoming sequence of rotated symbols from the incoming signals, (iii) applies a sequence of de-rotations based on the sequence of random rotations to the incoming sequence of rotated symbols to generate an incoming sequence of de-rotated symbols, and (iv) recovers an incoming data stream from the incoming sequence of de-rotated symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification