Abstract

A method and apparatus for remote watermarking of a media program is disclosed. The method inserts a pattern of substituted second versions of media program portions that are invisible to the viewer, into reproduced copies of the media program. The method permits the watermarking of encrypted media programs.

IPC Classes  ?

• G06T 1/00 - General purpose image data processing

Abstract

Method and apparatus for implementing LDPC codes in an IEEE 802.11 standard system configured to operate in a Multiple-Input, Multiple-Output (MIMO) schema. A method in accordance with the present invention comprises defining a base LDPC code, having a length equal to an integer number of data carriers in an ODFM symbol, transmitting the base LDPC code over a plurality of sub-carriers, wherein the base code is transmitted at an expected phase on sub-carriers specified by the IEEE 802.11 standard system, and transmitting the base LDPC code on other sub-carriers than those specified by the IEEE 802.11 standard system, wherein the base LDPC code on the other sub-carriers is transmit offset in phase from the base LDPC code on the specified sub-carriers.

IPC Classes  ?

• H04L 27/26 - Systems using multi-frequency codes
• H04L 1/00 - Arrangements for detecting or preventing errors in the information received
• H04L 1/06 - Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Abstract

An apparatus for controlling fraud in a satellite signal delivery system. An apparatus in accordance with the present invention comprises a receive antenna for receiving at least one satellite signal, and a module, coupled to the receive antenna, for selectively delivering the at least one satellite signal to at least one receiver via an output of the module, wherein the module creates an association between the module and the at least one receiver upon installation of the at least one receiver to the output, such that the module delivers the at least one satellite signal to the at least one receiver only when the association is present.

IPC Classes  ?

• H04L 9/32 - Arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system
• H04N 21/441 - Acquiring end-user identification
• H04N 7/20 - Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

An approach is provided for minimizing co-channel interference in a communication system (100) is disclosed. A header (401) of a first frame is scrambled based on a first unique word (411, 413). A header (401) of a second frame is scrambled based on a second unique word (411, 413). The first frame including the corresponding scrambled header (401) and the second frame including the corresponding scrambled header (401) are transmitted, respectively, over adjacent co-channels of the communication system (100). Each of the frames further includes a payload (403) and a pilot block (405). The payload (403) and the pilot black (405) of the first frame are scrambled based on a first scrambling sequence. The payload (403) and the pilot black (405) of the second frame are scrambled based on a second scrambling sequence. The above arrangement is particularly suited to a digital satellite broadcast and interactive system (100).

IPC Classes  ?

• H04B 1/707 - Spread spectrum techniques using direct sequence modulation
• H04H 20/51 - Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups specially adapted for satellite broadcast systems
• H04L 27/32 - Carrier systems characterised by combinations of two or more of the types covered by groups , , , or

Abstract

Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first header of the first signal using a first scrambling code, scrambling a second header of the second signal using a second scrambling code, and transmitting the first signal and the second signal with the scrambled first header and the scrambled second header over different channels of the communication system.

IPC Classes  ?

• H04W 12/02 - Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• H04B 1/76 - Pilot transmitters or receivers for control of transmission or for equalising
• H04B 7/005 - Control of transmission; Equalising
• H04B 7/185 - Space-based or airborne stations
• H04N 7/20 - Adaptations for transmission via a GHz frequency band, e.g. via satellite