Method to enable single frequency network optimization

Delphi also had this patent application published for the network optimization of SDARS networks:

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United States Patent Application	20060274855
Kind Code	A1
DiBiaso; Eric A. ; et al.	December 7, 2006

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Method to enable single frequency network optimization

Abstract

Additional data may be added to the current SDARS satellite signals as a phase and/or amplitude offset from the legacy quadrature phase shift keying (QPSK) modulated data and transmitted by the SDAR terrestrial repeaters. However, in the case where a legacy receiver architecture for a differential modulation system outputs angular/phase differences between carriers, the phase and/or amplitude information appears as distortion to the legacy receiver. The present invention provides a method for optimizing the SDARS infrastructure more efficiently by allowing independent adjustment of the phase and/or amplitude offset (610) at each terrestrial site. The present invention provides a method for adjusting the performance of each signal together or separately as needed.

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Inventors:	DiBiaso; Eric A.; (Kokomo, IN) ; Hiatt; Michael L. JR.; (Westfield, IN) ; Walker; Glenn A.; (Greentown, IN)
Correspondence Name and Address:	DELPHI TECHNOLOGIES, INC. M/C 480-410-202 PO BOX 5052 TROY MI 48007 US
Serial No.:	143044
Series Code:	11
Filed:	June 2, 2005

U.S. Current Class:	375/308
U.S. Class at Publication:	375/308
Intern'l Class:	H04L 27/20 20060101 H04L027/20

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