Method to enable single frequency network optimization

Details Method to enable single frequency network optimization Method to enable single frequency network optimization

2005-06-02

2010-10-26

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S295000, C375S299000, C375S302000, C375S316000, C375S322000

Reexamination Certificate

active

07822149

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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