The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 2005
Filed:
Feb. 16, 1999
Hui-ling Lou, Murray Hill, NJ (US);
Zulfiquar Sayeed, Easy Windsor, NJ (US);
Vijitha Weerackody, Watchung, NJ (US);
Hui-Ling Lou, Murray Hill, NJ (US);
Zulfiquar Sayeed, Easy Windsor, NJ (US);
Vijitha Weerackody, Watchung, NJ (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A CDM satellite transmission system is disclosed that broadcasts programming content, such as audio and video information, using one or more geo-synchronous satellites based on Code Division Multiple Access technology. Forward error correction coding and interleaving are used prior to broadcasting the signals over the CDM channel to account for signal loss due to short-term fading. The CDM satellite transmission system provides a tuning channel corresponding to each program channel that reduces the delay when a mobile receiver is first tuned to a selected program channel. The tuning channel utilizes a shorter interleaver length, if any, than the corresponding primary program channel. The CDM satellite transmission system transmits a delayed version of a program signal with the on-time version of the audio output to accommodate uninterrupted reception in the event of such a blockage. In one implementation of the invention, the core layer, C(n), of the delayed version of the audio output of a scalable audio coding scheme is utilized as the tuning channel. The core layer, C(n), and enhancement layers, E(n), of the on-time signal and the enhancement layers, E(n), of the delayed-time signal employ a representative block interleaver having a duration of four seconds. The tuning channel (C(n), of the delayed-time signal) employs a representative block interleaver having a duration of 500 milliseconds.