Method for a soft-decision modulation system
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United States of America Patent
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Nov 12, 1996
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N/A
app pub date -
Apr 24, 1995
filing date -
Apr 24, 1995
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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.
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