Threshold level generator

Details Threshold level generator Threshold level generator

1991-09-26

1993-01-19

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 328150, 307354, 307362, H04L 2730, H03K 5153

Patent

active

051812266

ABSTRACT:
A threshold level generator for generating threshold levels to detect zero-crossings of a spread spectrum received waveform. An IF sampler quantizes the received spread spectrum signals at IF. The IF signal is sampled at a number of quarter cycle intervals to allow sampling in sequence of the in-phase (I) and quadrature-phase (Q) components. The outputs of the IF sampler are two bits, a sign bit and a magnitude bit. The threshold level generator using only the sign bit of the I and Q samples sets a threshold level (T0) to detect the zero-crossings of a received waveform. Two magnitude threshold levels are set at fixed offsets (D1 and D2) from the T0 threshold level.

REFERENCES:
patent: 4509180 (1985-04-01), Neyer
patent: 4649394 (1987-03-01), Minker et al.

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