Digital transmitter and method

Details Digital transmitter and method Digital transmitter and method

2008-09-09

2008-09-09

Vuong, Quochien B (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S110000, C455S118000, C375S295000, C375S302000, C341S061000

Reexamination Certificate

active

11333779

ABSTRACT:
A transmitter and method is provided for digitally upconverting a baseband digital signal to a modulated intermediate frequency (IF) digital signal and sigma-delta modulating the IF digital signal. The baseband digital signal is split into N phases, as can be accomplished using a polyphase interpolation technique (polyphase filter), and modulated. The modulated N phases are not recombined and each phase is further modulated, as can be accomplished using a digital-to-digital sigma-delta modulator that generates digital output signals at the same rate. A high speed digital multiplexer multiplexes the digital output signals into a single bit stream at a higher rate for subsequent power amplification and RF transmission.

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