Method to inject hierarchical data onto single carrier stream

Details Method to inject hierarchical data onto single carrier stream Method to inject hierarchical data onto single carrier stream

2007-10-09

2007-10-09

Tse, Young T. (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C332S103000

Reexamination Certificate

active

10946678

ABSTRACT:
The present invention involves a transmitter for transmitting two levels of data in a hierarchical transmission system. The transmitter has encoders, a modulator, an adjuster, and an up converter. The first encoder has a first output and capable of providing digital information based on a first level of data on the first output. The second encoder has a second output and is capable of providing digital information based on a second level of data on the second output. The modulator is coupled to the first encoder and has I and Q outputs. The adjuster is coupled to the modulator and second encoder and modifies signals on the I and Q outputs of the modulator to produce transmission I and transmission Q outputs. The up converter is coupled to the adjuster and is capable of transmitting broadcast radio signals based on the transmission I and transmission Q outputs. The modulator may include a root raised cosine filter and/or a QPSK modulator. The I and Q outputs of the modulator include analog I and analog Q signals. The adjuster includes an inverter, a phase rotator circuit, a combiner, and/or a limiter. The transmission I and transmission Q outputs of the adjuster include analog I and analog Q signals.

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DVB Digital Video Broadcasting; DVB, MHP, the DVB logo and the MHP logo are registered trademarks of the Digital Video Broadcasting Project.

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