|United States Patent Application||20060274855|
|DiBiaso; Eric A. ; et al.||December 7, 2006|
Method to enable single frequency network optimization
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.
|Inventors:||DiBiaso; Eric A.; (Kokomo, IN) ; Hiatt; Michael L. JR.; (Westfield, IN) ; Walker; Glenn A.; (Greentown, IN)|
|Correspondence Name and Address:|| |
DELPHI TECHNOLOGIES, INC.
|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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