Selective call receiving device with improved symbol decoding an

Details Selective call receiving device with improved symbol decoding an Selective call receiving device with improved symbol decoding an

1995-03-09

1996-10-15

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375340, 375345, H03L 700, H04L 700, H04B 106

Patent

active

055662137

ABSTRACT:
A selective call receiving device (10) includes a signal decoder that utilizes both a peak and valley routine and a stochastic gradient feedback route for processing a received signal. The peak and valley routine is operable prior to the detection of a predetermined synchronization word in the received signal to detect the peak and valley of a received signal and to generated based on detected peak and valley, a DC offset correction value for correcting the received signal prior to symbol decoding. A number of threshold values are also generated based on the detected peak and valley of the signal for use by a symbol decoder (77). The symbol decoder (77) utilizes the threshold values for decoding a signal into symbols. The symbol decoder (77) also generates a feedback error that is used after the detection of the predetermined synchronization word for updating the DC correction value and for generating a gain correction value. An automatic frequency control signal is generated based on the DC correction value and a signal quality metric derived from the feedback error.

REFERENCES:
patent: 4455663 (1984-06-01), Ragsdale
patent: 4627079 (1986-12-01), Von Der Embse
patent: 4669094 (1987-05-01), Van Rumpt
patent: 5025251 (1991-06-01), Mittel et al.
patent: 5040194 (1991-08-01), Tjahjadi et al.
patent: 5311554 (1994-05-01), Morera et al.
patent: 5406587 (1995-05-01), Horwitz et al.
NASA's Jet Propulsion Laboratory, "Decision-Directed Automatic Gain Control," NASA Tech Briefs, vol. 4, No. 1, p. 10.

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