Einzeltreffer — DigiBib

A node in a first network requests a communication channel from a second network. Upon receiving a channel assignment, nodes in the first network employ the assigned channel for communicating in a manner that is transparent to the second network. A transmitting node selects a decoy data signal as a carrier signal, synthesizes data-bearing channel distortions; and distorts the carrier signal with the channel distortions prior to transmission. An undistorted version of the decoy data may be transmitted to an intended receiver. The receiver distinguishes between the synthesized data-bearing channel distortions and natural channel distortions to decrypt the data. In a MIMO system, the transmitter generates a MIMO precoding matrix from a message to be sent to the receiver and multiplies the decoy data signal vector with the MIMO precoding matrix.

Titel:	LPI/LPD Communication Systems
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2014
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20140219449 Publication Date: August 7, 2014 Appl. No: 13/757032 Application Filed: February 01, 2013 Claim: 1. A communication method, comprising: at least one node in a first network requesting a communication channel from a second network; and upon receiving a channel assignment from the second network, employing the channel assignment for communicating in the first network in a manner that is transparent to the second network. Claim: 2. The method of claim 1, wherein the first network retransmits at least one of downlink channels and broadcast channels employed by the second network. Claim: 3. The method of claim 1, further comprising employing interference cancellation in the first network for cancelling transmissions received from the second network. Claim: 4. The method of claim 1, wherein the first network is a peer-to-peer network and the second network is a cellular network. Claim: 5. The method of claim 1, further comprising performing beamforming to degrade the SNR of unintended receivers. Claim: 6. The method of claim 1, wherein communicating complies with the second network's data transmission format while employing predetermined portions of the format's data payload for enabling the first network's network control functions. Claim: 7. The method of claim 1, wherein requesting a communication channel from the second network comprises a first node and a second node requesting uplink and downlink channels from the second network, followed by the first node sending a request to the second node to establish a peer-to-peer link; and wherein communicating comprises, upon receiving an acknowledgement from the second node, employing at least one of the uplink and downlink channels for communicating directly with each other. Claim: 8. A communication method, comprising: selecting a decoy data signal as a carrier signal; synthesizing channel distortions bearing data; and distorting the carrier signal with the channel distortions prior to transmission. Claim: 9. The method of claim 8, further comprising providing an undistorted version of the decoy data to an intended receiver. Claim: 10. The method of claim 8, wherein the channel distortions are a function of channel measurements. Claim: 11. The method of claim 8, wherein the decoy data signal comprises at least one of a retransmitted broadcast signal, a predetermined data sequence that can be locally reproduced by a receiving node, a data sequence stored in memory at the receiving node, and a clean replica supplied to the receiving node via an alternative channel. Claim: 12. A communication method, comprising: receiving a signal comprising a decoy data signal having synthesized data-bearing channel distortions and natural channel distortions; receiving a clean decoy data signal; and distinguishing between the synthesized data-bearing channel distortions and the natural channel distortions. Claim: 13. The method of claim 12, wherein the clean decoy data signal comprises at least one of a decoy data signal received from a third-party network, a decoy data signal received from a different channel in a network from which the decoy data signal having synthesized data-bearing channel distortions and natural channel distortions is received, a known training sequence, a locally stored data sequence, and a locally generated data sequence. Claim: 14. A communication method, comprising: selecting a decoy data signal vector for transmission; generating a MIMO precoding matrix from a message to be sent between at least two nodes; and multiplying the decoy data signal vector by the MIMO precoding matrix for constructing a precoded signal vector to be transmitted. Claim: 15. The method of claim 14, wherein the MIMO precoding matrix is a function of channel measurements. Claim: 16. The method of claim 14, wherein the MIMO precoding matrix comprises transmit power values for each spatial subchannel based on the message and calculated eigenvalues of matrix HH†, where H is an estimated MIMO channel matrix. Claim: 17. The method of claim 14, wherein time-varying features of the MIMO precoding matrix are based on the message. Claim: 18. The method of claim 14, wherein generating a MIMO precoding matrix employs Cooperative MIMO. Claim: 19. The method of claim 14, further comprising receiving the precoded signal vector at an intended receiver, removing the decoy data signal vector, and decrypting the message by decoding the MIMO precoding matrix. Current U.S. Class: 380/270 Current International Class: 04

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LPI/LPD Communication Systems