Variable multi-threshold detection for 0.3-GMSK

Details Variable multi-threshold detection for 0.3-GMSK Variable multi-threshold detection for 0.3-GMSK

1994-09-16

1995-10-17

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375317, 375274, H03D 300, H04L 2714

Patent

active

054597625

ABSTRACT:
A variable multi-threshold detection circuit for a sampled baseband signal in the receiver of a communication system using GMSK modulation is disclosed. The circuit comprises an integrate/dump circuit for accumulating a predetermined number of samples of the baseband signal to generate a sum for a present bit, a level selector for selecting a threshold from a plurality of groups of multi-thresholds based on an estimated phase offset and the binary value of two previous bits, a compare circuit for comparing the sum from the integrate/dump circuit with the threshold selected from the level selector to generate a binary value of either one of "0" or "1" for the present bit, and a delay circuit for delaying the present bit to be used by the level selector to determine a next threshold for a next bit.

REFERENCES:
patent: 4096442 (1978-06-01), McRae et al.
patent: 4387465 (1983-06-01), Becker
patent: 5001726 (1991-03-01), Kawai et al.
patent: 5091920 (1992-02-01), Ikeda et al.
patent: 5151925 (1992-09-01), Gelin et al.
patent: 5187719 (1993-02-01), Birgenheier
patent: 5245611 (1993-09-01), Ling et al.

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