Thursday, October 26, 2006

XM Discloses Hierarchical Modulation Patent Application

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
20060239365
Kind Code
A1

Smallcomb; Joseph ; et al.

October 26, 2006

Method and system for hierarchical modulation and demodulation for digital radio

Abstract
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.

Inventors:
Smallcomb; Joseph; (Lake Worth, FL) ; Marko; Paul; (Pembroke Pines, FL)
Correspondence Name and Address:

AKERMAN SENTERFITT
P.O. BOX 3188
WEST PALM BEACH
FL
33402-3188
US

Assignee Name and Adress:
XM Satellite Radio, Inc.WashingtonDC20002
Serial No.:
112658
Series Code:
11
Filed:
April 22, 2005
U.S. Current Class:
375/260
U.S. Class at Publication:
375/260
Intern'l Class:
H04L 27/28 20060101 H04L027/28

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1 comment:

Elibom said...

Yes. I heard about this layered modulation before. I found an analysis of it here

http://to.swang.googlepages.com/C00-NTAH-20070827-009-LGE-LayerModul.pdf