On September 28, 2006, Delphi had another hierarchical modulation related patent application published in a series of such applications:
United States Patent Application 20060215790
Kind Code A1
Dibiaso; Eric A. ; et al.
September 28, 2006
Method to demodulate amplitude offsets in a differential modulation system
Where the additional data throughput is added using an amplitude offset or a combination of phase and amplitude offset, the legacy differential demodulator does not recover the amplitude information. The present invention provides a method for demodulating amplitude offsets in a differential modulation system in order to recover the amplitude information. The demodulated amplitude information may be used to recover the additional Level 2 data transmitted as an amplitude offset or combination phase and amplitude offset in a differential multiple phase shift keying (D-MPSK) transmission, such as across adjacent OFDM symbols and/or adjacent frequency subcarriers.
Dibiaso; Eric A.; (Kokomo, IN) ; Hiatt; Michael L. JR.; (Weatfield, IN) ; Walker; Glenn A.; (Greentown, IN)
Correspondence Name and Address:
DELPHI TECHNOLOGIES, INC.
PO BOX 5052
Serial No.: 088129
Series Code: 11
Filed: March 23, 2005
U.S. Current Class:375/330
U.S. Class at Publication:375/330
Intern'l Class: H04L 27/22 20060101 H04L027/22
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