H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 13/29 (2006.01) H04L 1/00 (2006.01) H04L 27/34 (2006.01)
Patent
CA 2052906
ABSTRACT SYSTEM FOR MODULATING/DEMODULATING DIGITAL SIGNALS TRANSMITTED WITH ENCODED MODULATION. Encoding and decoding devices (5, 105) influ- encing digital signals transmitted with encoded modula- tion. For the encoding a channel encoder (12) performs a code concatenation to distribute the protection redun- dancy bits over various symbol periods of the encoded modulation, for example, over two multiplexed 16 QAMs. A source encoder (11) may effect a reduction of the input bit rate. A differential encoder (31) may be used for the encoding so as to ensure the detection of the phase rotation invariance of the code. At the receiver end a decoding device (105) performs the corresponding operations in reverse. The invention may be used for digital signal transmission of: television, microwave, mobile radio signals, for storage on compact disc or on digital video recorder, for communication between computers. Applications: Television, microwave links, mobile radio, storage on compact disc or on digital video recorder, communication between computers. References: Figs. 1A and 1B.
Chouly Antoine
Fazel Khaled
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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