On October 26, 2006, XM had its patent application for hierarchical modulation published. When implemented, this will allow XM more throughput on its available spectrum.
United States Patent Application
Smallcomb; Joseph ; et al.
October 26, 2006
Method and system for hierarchical modulation and demodulation for digital radio
A communication system (10) using hierarchical modulation includes at least one satellite (12 & 13) transmitting a data stream and a hierarchical modulated data stream, and at least one terrestrial station (16) transmitting the data stream and the hierarchical modulated data stream. The communication system can further include at least one receiver (18) for demodulating and combining the data stream from at least one satellite and from at least one terrestrial station and for hierarchically demodulating and combining the hierarchical modulated data stream from at least one satellite and the hierarchical modulated data stream from at least one terrestrial station. The terrestrial station can be a terrestrial repeater repeating the data stream and the hierarchical data stream from at least one satellite. The system can also include an uplink (11) having a hierarchical modulator for modulating both the data stream and the hierarchical data stream.
Smallcomb; Joseph; (Lake Worth, FL) ; Marko; Paul; (Pembroke Pines, FL)
Correspondence Name and Address:
P.O. BOX 3188
WEST PALM BEACH
Assignee Name and Adress:
XM Satellite Radio, Inc.WashingtonDC20002
April 22, 2005
U.S. Current Class:
U.S. Class at Publication:
H04L 27/28 20060101 H04L027/28
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