Method for a soft-decision modulation system

Details Method for a soft-decision modulation system Method for a soft-decision modulation system

1995-04-24

1996-11-12

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375262, 375341, 371 43, H03M 1312, H04L 100

Patent

active

055747515

ABSTRACT:
A soft-decision modulation system (10) has a transmitter (11) and a receiver (21). The transmitter encodes (68), modulates (72) and transmits (74-78) a data stream. The receiver receives the modulated data stream and recovers symbols (86) representing the transmitted data stream. Data decoding (92) is performed with a trellis decoder with a soft-decision metric using a selected set of coefficients (90). The performance of the decoding step is evaluated (104). The coefficients are adjusted (108) until performance is acceptable. When performance is satisfactory the coefficients are installed (112) in the modulation system.

REFERENCES:
patent: 4979175 (1990-12-01), Porter
patent: 5128967 (1992-07-01), Durkin et al.
patent: 5144644 (1992-09-01), Borth
patent: 5208816 (1993-05-01), Seshadri et al.
patent: 5375129 (1994-12-01), Cooper
patent: 5471500 (1995-11-01), Blaker et al.

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