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:
Nov. 17, 2009
Filed:
Jan. 14, 2008
Ji LI, San Jose, CA (US);
Laurence J. Newell, Mercer Island, WA (US);
Tin Vo, San Jose, CA (US);
Ting K. Yee, Foster City, CA (US);
Peter H. Chang, San Jose, CA (US);
Robert K. Mcelheny, Sunnyvale, CA (US);
Ji Li, San Jose, CA (US);
Laurence J. Newell, Mercer Island, WA (US);
Tin Vo, San Jose, CA (US);
Ting K. Yee, Foster City, CA (US);
Peter H. Chang, San Jose, CA (US);
Robert K. McElheny, Sunnyvale, CA (US);
Other;
Abstract
A heterodyne communication system uses coherent data modulation that is resistant to phase noise. In particular, a pilot tone and reference clock signal are transmitted along with the modulated data to form the basis of an electrical demodulation local oscillator at the receiver. The pilot tone and/or reference clock signal carry phase noise which is correlated with the phase noise in the data signal. At the receiver, the local oscillator is generated from the pilot tone and reference clock signal in a manner so that the local oscillator also has phase noise which is correlated with the phase noise in the data signal. Thus, the two noise components can be used to cancel each other during demodulation of the data signal using the local oscillator.