Apparatus and method for using forward error correction setting

Details Apparatus and method for using forward error correction setting Apparatus and method for using forward error correction setting

1997-07-11

1999-07-13

Pham, Chi H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370486, 370543, 455 32, H04J 322

Patent

active

059236426

ABSTRACT:
An apparatus and method using the forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks including cable television systems is described. The system includes a transcoder having a demultiplexer for demultiplexing a forward-error-correction decoded signal into a main data stream with a bit rate suitable for 64-QAM cable transmission and an auxiliary data stream with a bit rate approximately half that of the main data stream. Two of such auxiliary data streams can be combined to generate an output data stream with a bit rate suitable for 64-QAM cable transmission. The system also includes a satellite transmitter which can adjust its convolution coding rate to either 1/2 or 3/4 for 64-QAM and 256-QAM cable channels respectively.

REFERENCES:
IRT 1000 Integrated Receiver Transcoder, Installation and Operation Manual, General Instrument, 1996.

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