Pulse or digital communications – Receivers
Reexamination Certificate
2003-07-01
2008-08-26
Ahn, Sam K. (Department: 2611)
Pulse or digital communications
Receivers
Reexamination Certificate
active
07418060
ABSTRACT:
A method and receiver systems for demodulating and decoding a hierarchically modulated signal, e.g. an 8 PSK signal, are disclosed. An exemplary method includes demodulating and processing (502) the hierarchically modulated signal (202) to produce symbols (212) from the first modulation at the first hierarchical level, applying information (504) from a plurality of the symbols from the first modulation at the first hierarchical level in subtracting (214) from the demodulated hierarchically modulated signal to obtain the second modulation at the second hierarchical level and processing (506) the second modulation at the second hierarchical level to produce second symbols (222) from the demodulated second signal. The hierarchically modulated signal comprises a non-uniform 8 PSK signal. Applying the information from the plurality of the symbols from the first modulation can be achieved by applying the symbols after error correction. A decision-directed demodulation of the first modulation can also be used to further improve performance.
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Chen Ernest C.
Santoru Joseph
Ahn Sam K.
The DIRECTV Group Inc.
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