Digital transmitter and method

Telecommunications – Transmitter – Plural modulation

Reexamination Certificate

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Details

C455S110000, C455S118000, C375S295000, C375S302000, C341S061000

Reexamination Certificate

active

07424274

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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