Subscriber unit for wireless digital subscriber communication sy

Details Subscriber unit for wireless digital subscriber communication sy Subscriber unit for wireless digital subscriber communication sy

1989-08-14

1991-04-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 11, 375 13, 370 72, H04B 138

Patent

active

050089005

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 processor 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.

REFERENCES:
patent: 4123774 (1978-10-01), Hjortzberg
patent: 4644561 (1987-02-01), Paneth et al.
patent: 4754340 (1988-06-01), Nakagawa et al.
patent: 4764940 (1988-08-01), Paneth et al.
patent: 4811420 (1989-03-01), Avis et al.
patent: 4825448 (1989-04-01), Critchlow et al.
patent: 4881240 (1989-11-01), Critchlow et al.
patent: 4893317 (1990-01-01), Critchlow et al.

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