FM discriminator with automatic gain control for digital signal

Details FM discriminator with automatic gain control for digital signal FM discriminator with automatic gain control for digital signal

1997-11-21

1999-12-14

Chin, Stephen

Pulse or digital communications

Receivers

Automatic gain control

329341, 364765, H04L 2708, H03D 300, G06F 752

Patent

active

060027266

ABSTRACT:
A method of extracting an information bearing signal .omega.(n) from a base-band signal in the form of an inverse function with a digital signal processor. The processor includes memory and utilizes a minimum number of instructions stored in the memory. The base-band waveform comprises a plurality of complex-valued samples having respective I and Q components. The method includes the steps of receiving a first sample at an instant n having respective I(n) and Q(n) components and defining an interval for evaluating potential values for the I(n) and Q(n) components. Next, a step of transforming said I(n) and Q(n) components is performed to have respective threshold values residing in the predefined interval. Then, a step of estimating the transformed components with a series of non-inverted polynomial functions is carried out over the predefined interval. The method proceeds by extracting the information-bearing signal with the digital signal processor according to the instructions to evaluate the series of non-inverted polynomial functions.

REFERENCES:
patent: 4893316 (1990-01-01), Janc et al.
patent: 5623521 (1997-04-01), Yaguchi et al.
patent: 5757858 (1998-05-01), Black et al.

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