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:
Feb. 11, 2014
Filed:
Sep. 02, 2008
Behzad B. Mohebbi, San Diego, CA (US);
Behzad B. Mohebbi, San Diego, CA (US);
Nextivity, Inc., San Diego, CA (US);
Abstract
An OFDM modem is presented that uses a pilot sub-carrier signal structure for channel estimation to reduce link latency of the modem, or alternatively, a pseudo-random number sequence inserted into the OFDM signal for later detection for channel estimation. The OFDM signal includes multiple symbols, each symbol having a plurality of closely-spaced, orthogonal data sub-carrier signals carrying data. In some implementations, one or more pilot sub-carrier signals are inserted with the data sub-carrier signals. Each pilot sub-carrier signal is modulated with a predetermined pilot modulation scheme. Each pilot sub-carrier signal is placed at a different sub-carrier signal location for each successive symbol duration of the OFDM signal to form a sliding pilot sub-carrier signal.