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. 29, 2011
Filed:
Jul. 16, 2009
Anthony Eugene Zortea, Pipersville, PA (US);
Matthew Mcadam, Vancouver, CA;
Anthony Eugene Zortea, Pipersville, PA (US);
Matthew McAdam, Vancouver, CA;
PMC-Sierra, Inc., Santa Clara, CA (US);
Abstract
In a Frequency Duplex Division (FDD) radio, the transmit and receive signals are separated by frequency. In a wireless application, the power of the transmitted signal is typically much larger than the power of the received signal. A duplexer is used to separate the transmit and receive signals. Despite the operation of the duplexer, a residual transmit signal, or echo, can be present at the receiver input as a result of finite attenuation in the duplexer and other sources of transmit to receive crosstalk. With a relatively linear low-noise amplifier (LNA) and output limited mixer linearity, the echo can be cancelled in analog baseband directly at the mixer output using an out-of-channel signal indicator as the error signal for an echo control loop.