Digital RF receiver

Details Digital RF receiver Digital RF receiver

1992-07-29

1995-03-07

Chin, Stephen

Pulse or digital communications

Receivers

375345, 375350, H04L 2706, H03K 900

Patent

active

053965205

ABSTRACT:
A digital RF receiving system is provided for processing relatively weak analog signals transmitted in a noisy environment. The system includes a receiver for filtering and mixing the incoming signal. Automatic gain control components are provided for digitally attenuating the signal before processing by the receiver so that useful information contained in the signal will not be lost due to saturation of the amplifier within the receiver. The automatic gain control components include a high speed A/D converter, digital processor, and digital attenuator driven by the digital process in response to the signal received from the high speed A/D converter. A second relatively high speed A/D converter samples and digitizes the output signal from the receiver at a relatively high rate. A microprocessor is included for digitally filtering and processing the digitized signal from the A/D converter into useful digital information. The microprocessor further includes an auto-recursive loop for flushing valid binary data from the digitized signal. The auto-recursive loop drives a segment of the digitized signal through digital filters and predetermined number of passes with the band width of the filters being shifted prior to each pass therethrough. Valid binary data is converted to RS 232 serial output.

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