Coded modulation apparatus

Details Coded modulation apparatus Coded modulation apparatus

1994-09-22

1996-10-29

Baker, Stephen M.

Excavating

371376, 375280, 375281, H03M 1300, H04L 2720

Patent

active

055703798

ABSTRACT:
A transmitting section performs error-correcting coding of signal streams, converts the signal streams into a 2.sup.m -value quadrature amplitude-modulated radio signal, and transmits the radio signal to a channel. A receiving section receives the radio signal and generates signal streams having the same signal format as that of the above signal streams. An encoder codes a signal stream according to even and odd parity rules respectively set for the first and second half portions of a frame pulse. A decoder decodes a signal stream on the assumption that different parity rules are applied for the first and second half periods of the signal stream, and at the same time reproduces a frame pulse. This coded modulation scheme can eliminate uncertainty in the arrangement of signal streams in a rate converter.

REFERENCES:
patent: 4346474 (1982-08-01), Sze
patent: 4807230 (1989-02-01), Srinivasagopalan
patent: 5124979 (1992-06-01), Matui
patent: 5448592 (1995-07-01), Williams et al.
David R. Smith, "Digital Transmission Systems", 1985, published by Van Nostrand Reinhold Company, Inc., eight pages total.

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