Thursday, June 21, 2007

Sirius Antenna Diversity Patent Application

United States Patent Application 20070142009
Kind Code A1

Scarpa; Carl ; et al.

June 21, 2007

Systems and methods for antenna diversity combining for satellite radio signals

Abstract
Systems and methods are presented for digital antenna diversity combining. In exemplary embodiments of the present invention, at least two antenna signal paths can be communicably connected to a receiver. Each antenna signal path can be provided with an RF tuner communicably connected to a demodulator, which can estimate the signal to noise ratio (SNR) and time of arrival of its respective antenna signal. In exemplary embodiments of the present invention, a time alignment circuit can be communicably connected to each antenna signal path, and a maximum ratio combiner can be communicably connected to the time alignment circuit. In operation, the time alignment circuit can use the time of arrival estimate to align the multiple signals and the maximum ratio combiner can use the SNR estimate obtained for each antenna signal to respectively weight each signal and thereby generate a combined output signal. In exemplary embodiments of the present invention, a switch diversity combiner can be further provided, and can quickly detect when an antenna signal is entering a fade, allowing the maximum ratio combiner to set that signal's weight to zero. In exemplary embodiments of the present invention, a digital diversity combiner can be provided in a stand alone integrated circuit, or can be integrated in a larger integrated circuit, such as, for example, a satellite radio overlay processor.

Inventors:
Scarpa; Carl; (Plainsboro, NJ) ; Sazzad; Sharif; (Ewing, NJ) ; Strolle; Christopher; (Fort Washington, PA)

Correspondence Name and Address:
KRAMER LEVIN NAFTALIS & FRANKEL LLP;INTELLECTUAL PROPERTY DEPARTMENT
1177 AVENUE OF THE AMERICAS
NEW YORK
NY
10036
US

Assignee Name and Adress:
Sirius Satellite Radio, Inc.New yorkNY
Serial No.: 607383
Series Code: 11
Filed: December 1, 2006
U.S. Current Class:455/132; 455/272
U.S. Class at Publication:455/132; 455/272
Intern'l Class: H04B 7/08 20060101 H04B007/08; H04B 1/06 20060101 H04B001/06

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