METHOD AND APPARATUS FOR MINIMIZING CO-CHANNEL INTERFERENCE BY SCRAMBLING
First Claim
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1. A method for transmitting a plurality of signals in a communication system, each signal comprising a plurality of frames, wherein each frame in the plurality of frames comprises a header portion and a payload portion, comprising:
- assigning a first scrambling sequence with a scrambler at a transmission station in the communications system to a first header portion of a first frame of a first signal; and
assigning a second scrambling sequence with the scrambler at the transmission station in the communications system to a second header portion of a second frame of a second signal, the second signal being different than the first signal, wherein the first scrambling sequence and the second scrambling sequence are based on seeds selected from one of Table A and Table B;
TABLE A Seed Decimal Hex 1 00001 42348 0A56C 55204 0D7A4 57415 0E047 74129 12191 88022 157D6 111487 1B37F 112625 1B7F1 123876 1E3E4 137205 217F5 145515 2386B 151841 25121 166238 2895E 174767 2AAAF 183101 2CB3D 186848 2D9E0 188914 2E1F2
TABLE B Seed Decimal Hex 13 0000D 53 00035 70 00046 74 0004A 126 0007E 159 0009F 179 000B3 216 000D8 236 000EC 238 000EE 244 000F4 262 00106 278 00116 536 00218 628 00274 737 002E1 771 00303
wherein the corresponding payload portions of the frames are scrambled according to the respective different scrambling sequences assigned to the corresponding header portions.
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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.
84 Citations
20 Claims
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1. A method for transmitting a plurality of signals in a communication system, each signal comprising a plurality of frames, wherein each frame in the plurality of frames comprises a header portion and a payload portion, comprising:
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assigning a first scrambling sequence with a scrambler at a transmission station in the communications system to a first header portion of a first frame of a first signal; and assigning a second scrambling sequence with the scrambler at the transmission station in the communications system to a second header portion of a second frame of a second signal, the second signal being different than the first signal, wherein the first scrambling sequence and the second scrambling sequence are based on seeds selected from one of Table A and Table B; TABLE A Seed Decimal Hex 1 00001 42348 0A56C 55204 0D7A4 57415 0E047 74129 12191 88022 157D6 111487 1B37F 112625 1B7F1 123876 1E3E4 137205 217F5 145515 2386B 151841 25121 166238 2895E 174767 2AAAF 183101 2CB3D 186848 2D9E0 188914 2E1F2 TABLE B Seed Decimal Hex 13 0000D 53 00035 70 00046 74 0004A 126 0007E 159 0009F 179 000B3 216 000D8 236 000EC 238 000EE 244 000F4 262 00106 278 00116 536 00218 628 00274 737 002E1 771 00303 wherein the corresponding payload portions of the frames are scrambled according to the respective different scrambling sequences assigned to the corresponding header portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of receiving a plurality of signals in a communication system, each signal comprising a plurality of frames, wherein each frame in the plurality of frames comprises a header portion and a payload portion, comprising:
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receiving the plurality of signals at a receiver; descrambling a first signal at the receiver; and descrambling a second signal at the receiver, wherein the first signal is scrambled with a first scrambling sequence applied to a first plurality of frames of the first signal, and the second signal is scrambled with a second scrambling sequence applied to a second plurality of frames of the second signal, wherein the first scrambling sequence and the second scrambling sequence are based on seeds selected from one of Table A and Table B; TABLE A Seed X Decimal Hex 1 00001 42348 0A56C 55204 0D7A4 57415 0E047 74129 12191 88022 157D6 111487 1B37F 112625 1B7F1 123876 1E3E4 137205 217F5 145515 2386B 151841 25121 166238 2895E 174767 2AAAF 183101 2CB3D 186848 2D9E0 188914 2E1F2 TABLE B Seed X Decimal Hex 13 0000D 53 00035 70 00046 74 0004A 126 0007E 159 0009F 179 000B3 216 000D8 236 000EC 238 000EE 244 000F4 262 00106 278 00116 536 00218 628 00274 737 002E1 771 00303 - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus for communicating in a radio communication system, comprising:
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a receiver configured to receive a plurality of signals in a communication system, each signal comprising a plurality of frames, each frame in the plurality of frames comprising a header portion and a payload portion;
wherein each of the signals in the plurality of signals are scrambled according to different scrambling sequences based on seeds selected from one of Table A and Table B;TABLE A Seed X Decimal Hex 1 00001 42348 0A56C 55204 0D7A4 57415 0E047 74129 12191 88022 157D6 111487 1B37F 112625 1B7F1 123876 1E3E4 137205 217F5 145515 2386B 151841 25121 166238 2895E 174767 2AAAF 183101 2CB3D 186848 2D9E0 188914 2E1F2 TABLE B Seed X Decimal Hex 13 0000D 53 00035 70 00046 74 0004A 126 0007E 159 0009F 179 000B3 216 000D8 236 000EC 238 000EE 244 000F4 262 00106 278 00116 536 00218 628 00274 737 002E1 771 00303 - View Dependent Claims (18, 19, 20)
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Specification