| US 7,551,736 B2 | ||
| Physical layer header scrambling in satellite broadcast systems | ||
| Lin-Nan Lee, Potomac, Md. (US); Feng-Wen Sun, Germantown, Md. (US); Adam Von Ancken, New Market, Md. (US); Joseph Santoru, Agoura Hills, Calif. (US); Ernest C. Chen, San Pedro, Calif. (US); Shamik Maitra, Redondo Beach, Calif. (US); Dennis Lai, Cerritos, Calif. (US); Guangcai Zhou, Agoura Hills, Calif. (US); and Tung-Sheng Lin, Claremont, Calif. (US) | ||
| Assigned to The DIRECTV Group, Inc., El Segundo, Calif. (US) | ||
| Filed on Apr. 11, 2005, as Appl. No. 11/102,958. | ||
| Claims priority of provisional application 60/561418, filed on Apr. 12, 2004. | ||
| Prior Publication US 2005/0226418 A1, Oct. 13, 2005 | ||
| Int. Cl. H04N 7/167 (2006.01); H04B 15/00 (2006.01) | ||
| U.S. Cl. 380—42 [380/212; 380/258; 380/233; 380/268; 380/210; 375/254; 375/285; 375/296; 375/346; 725/63; 725/100] | 20 Claims |
| 1. A method for minimizing co-channel interference in a communication system having at least a first signal and a second signal,
each signal transmitted on different channels within the communication system, comprising:
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
simultaneously transmitting the first signal and the second signal with the scrambled first header and the scrambled second
header from a single transmitter over different channels of the communication system.
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