Orthogonal frequency division multiplexing (OFDM) method and apparatus for protecting and authenticating wirelessly transmitted digital information
First Claim
1. A method for wireless orthogonal frequency division multiplexing (OFDM) communications, the method comprising:
- receiving an electromagnetic OFDM communication signal, wherein the OFDM communication signal is an electromagnetic signal or an electronic signal including embedded digital information, wherein the digital information is encoded by performing a first code puncturing of one or more sub-carriers of the OFDM communication signal at a first forward error correction (FEC) rate and performing a second code puncturing of the one or more sub-carriers of the OFDM communication signal at a second FEC rate, wherein the second FEC rate is higher than the first FEC rate, and wherein the digital information includes watermark information that is steganographically embedded in a portion of the digital information that is discarded when performing the second code puncturing such that the digital information appears to be encoded at the first FEC rate;
extracting the steganographically embedded digital information from the received electromagnetic OFDM communication signal; and
comparing the digital information extracted with a stored information.
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Abstract
A method and apparatus for protecting and authenticating wirelessly transmitted digital information using numerous techniques. The apparatus may be a wireless orthogonal frequency division multiplexing (OFDM) communication system, a base station, a wireless transmit/receive unit (WTRU), a transmitter, a receiver and/or an integrated circuit (IC). The wireless OFDM communication system includes a transmitter which steganographically embeds digital information in an OFDM communication signal and wirelessly transmits the OFDM communication signal. The system further includes a receiver which receives the OFDM communication signal and extracts the steganographically embedded digital information from the received OFDM communication signal.
128 Citations
59 Claims
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1. A method for wireless orthogonal frequency division multiplexing (OFDM) communications, the method comprising:
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receiving an electromagnetic OFDM communication signal, wherein the OFDM communication signal is an electromagnetic signal or an electronic signal including embedded digital information, wherein the digital information is encoded by performing a first code puncturing of one or more sub-carriers of the OFDM communication signal at a first forward error correction (FEC) rate and performing a second code puncturing of the one or more sub-carriers of the OFDM communication signal at a second FEC rate, wherein the second FEC rate is higher than the first FEC rate, and wherein the digital information includes watermark information that is steganographically embedded in a portion of the digital information that is discarded when performing the second code puncturing such that the digital information appears to be encoded at the first FEC rate; extracting the steganographically embedded digital information from the received electromagnetic OFDM communication signal; and comparing the digital information extracted with a stored information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A method for wireless orthogonal frequency division multiplexing (OFDM) communications, the method comprising:
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receiving an OFDM communication signal, wherein the OFDM communication signal is an electromagnetic signal or an electronic signal including embedded physical channels within the OFDM communication signal and embedded digital information wherein the digital information is encoded by performing a first code puncturing of one or more sub-carriers of the OFDM communication signal at a first forward error correction (FEC) rate and performing a second code puncturing of the one or more sub-carriers of the OFDM communication signal at a second FEC rate, wherein the second FEC rate is higher than the first FEC rate, and wherein the digital information includes watermark information that is steganographically embedded in a portion of the digital information that is discarded when performing the second code puncturing such that the digital information appears to be encoded at the first FEC rate; extracting the steganographically embedded digital information from the received OFDM communication signal; and comparing the digital information extracted with a stored information. - View Dependent Claims (56, 57, 58)
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59. A wireless transmit/receive unit (WTRU) comprising:
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a processor configured to create an electromagnetic orthogonal frequency division multiplexing (OFDM) communication signal, wherein the OFDM communication signal is an electromagnetic signal or an electronic signal including embedded digital information, wherein the digital information is encoded by performing a first code puncturing of one or more sub-carriers of the OFDM communication signal at a first forward error correction (FEC) rate and performing a second code puncturing of the one or more sub-carriers of the OFDM communication signal at a second FEC rate, wherein the second FEC rate is higher than the first FEC rate, and wherein the digital information includes watermark information that is steganographically embedded in a portion of the digital information that is discarded when performing the second code puncturing such that the digital information appears to be encoded at the first FEC rate; a receiver configured to extract the steganographically embedded digital information from the received electromagnetic OFDM communication signal; and a comparator configured to compare the digital information extracted with stored information at the receiver.
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Specification