Method and apparatus for minimizing co-channel interference by scrambling
First Claim
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1. A method for minimizing co-channel interference in a communication system, the method comprising the steps of:
- assigning a first scrambling sequence with a scrambler at a transmission station in the communications system, associated with a header or a pilot sequence of a first frame, to a first co-channel; and
assigning a second scrambling sequence with the scrambler at the transmission station in the communications system, associated with a header or a pilot sequence of a second frame, to a second co-channel that is adjacent to the first co-channel, wherein the scrambling sequences are based on Gold sequences with correspondingly different seeds, and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B;
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Abstract
An approach is provided for minimizing co-channel interference in a communication system is disclosed. Non-header portions of frames, which are transmitted over the communication system, are scrambled according to respective different scrambling sequences. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.
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Citations
24 Claims
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1. A method for minimizing co-channel interference in a communication system, the method comprising the steps of:
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assigning a first scrambling sequence with a scrambler at a transmission station in the communications system, associated with a header or a pilot sequence of a first frame, to a first co-channel; and assigning a second scrambling sequence with the scrambler at the transmission station in the communications system, associated with a header or a pilot sequence of a second frame, to a second co-channel that is adjacent to the first co-channel, wherein the scrambling sequences are based on Gold sequences with correspondingly different seeds, and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for minimizing co-channel interference in a communication system, comprising:
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a scrambler configured to assign a first scrambling sequence, associated with a header or a pilot sequence of a first frame, to a first co-channel, wherein the scrambler assigns a second scrambling sequence, associated with a header or a pilot sequence of a second frame, to a second co-channel that is adjacent to the first co-channel, wherein the scrambling sequences are based on Gold sequences with different seeds and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for communicating in a radio communication system, the method comprising the steps of:
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transmitting, from a transmitter in the radio communication system, a plurality of frames over different communication channels established over the radio communication system, the communication channels being adjacent co-channels, wherein each of the frames includes a header and a pilot sequence for synchronization of carrier phase and carrier frequency, and non-header portions of the frames are scrambled with a scrambler in the radio communication system according to respective different scrambling sequences, wherein the scrambling sequences are based on Gold sequences with different seeds and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (18)
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19. An apparatus for communicating in a radio communication system, comprising:
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a transmitter configured to transmit a plurality of frames over different communication channels established over the radio communication system, wherein the communication channels are adjacent co-channels, wherein each of the frames includes a header and a pilot sequence for synchronization of carrier phase and carrier frequency, and non-header portions of the frames are scrambled according to respective different scrambling sequences, wherein the scrambling sequences are based on Gold sequences with different seeds and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (20)
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21. A method for communicating in a radio communication system, the method comprising the steps of:
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receiving, at a receiver, a plurality of frames over different communication channels established over the radio communication system, the communication channels being adjacent co-channels, wherein each of the frames includes a header and a pilot sequence for synchronization of carrier phase and carrier frequency, and non-header portions of the frames are scrambled according to respective different scrambling sequences, wherein the scrambling sequences are based on Gold sequences with different seeds and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (22)
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23. An apparatus for communicating in a radio communication system, comprising:
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a receiver configured to receive a plurality of frames over different communication channels established over the radio communication system, wherein the communication channels are adjacent co-channels, wherein each of the frames includes a header and a pilot sequence for synchronization of carrier phase and carrier frequency, and non-header portions of the frames are scrambled according to respective different scrambling sequences, wherein the scrambling sequences are based on Gold sequences with different seeds and the co-channels are among 17 co-channels, the seeds corresponding to the 17 co-channels are specified by Table A or Table B; - View Dependent Claims (24)
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Specification