Forward error correction coding for hybrid AM in-band...

Pulse or digital communications – Transmitters – Amplitude modulation

Reexamination Certificate

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Details

C375S265000, C375S268000, C375S270000, C375S320000, C375S316000, C714S786000, C714S792000, C714S790000, C714S796000

Reexamination Certificate

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07340010

ABSTRACT:
An AM compatible digital audio broadcasting signal comprises an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an analog signal, and a plurality of digitally modulated subcarrier signals in the radio channel, wherein the digitally modulated subcarrier signals are modulated using complementary pattern-mapped trellis code modulation including a code mapped to overlapping partitions. Time diversity can be included between the analog modulated carrier signal and the plurality of digitally modulated subcarrier signals, and/or between groups of the digitally modulated subcarrier signals. A broadcasting method, and transmitters and receivers and that utilize the signal are also provided.

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