Pulse or digital communications – Transmitters – Angle modulation
Patent
1999-01-11
2000-06-20
Tse, Young T.
Pulse or digital communications
Transmitters
Angle modulation
375377, 327105, 455425, 332103, H04L 2720
Patent
active
060786299
ABSTRACT:
A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single prccessor chip and a radio. The processor chip transcodes a digital voice input signal to provide digital input symbols; demodulates an output signal received from the base station to provide digital output symbols; and synthesizes a digital voice output signal from the digital output symbols. The FIR chip FIR filters the digital input symbols and generates timing signals for timing the transcoding and synthesizing operations in the processor chip. The DIF chip digitally synthesizes a digital intermediate frequency signal by direct digital synthesis (DDS) and modulates the digital intermediate frequency signal with the filtered input symbols to provide a modulated intermediate frequency input signal. The radio further processes the modulated input signal for transmission to the base station.
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Avis Graham Martin
Critchlow David Norton
Heimbigner Wade Lyle
Johnson Karle Joseph
Wiley George Alan
InterDigital Technology Corporation
Tse Young T.
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