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:
Mar. 22, 2011
Filed:
May. 03, 2007
Elizabeth Chesnutt, Troy, MI (US);
Sethu K. Madhavan, Erie, PA (US);
Iqbal Surti, Troy, MI (US);
Jijin Yin, Los Angeles, CA (US);
Elizabeth Chesnutt, Troy, MI (US);
Sethu K. Madhavan, Erie, PA (US);
Iqbal Surti, Troy, MI (US);
Jijin Yin, Los Angeles, CA (US);
General Motors LLC, Detroit, MI (US);
Abstract
A system and method for asynchronous data communication over a cellular communications network that allows the transmission of different types of data frames over a voice channel using a vocoder. The data frames include a synchronization signal and data segment, with the synchronization signal being selected in accordance with an attribute of the data segment so that, upon receipt of the data frame, the synchronization signal can be used by the demodulating modem to determine not only where the data segment begins, but also to identify what type of data segment is in the received data frame. The synchronization signals used have low cross-correlation and an auto-correlation function that approximates a unit impulse function to provide reliable transmission through the vocoder.