Error-correction coding for multilevel transmission system

Details Error-correction coding for multilevel transmission system Error-correction coding for multilevel transmission system

1984-12-10

1986-11-11

Atkinson, Charles E.

Excavating

G06F 1110

Patent

active

046226702

ABSTRACT:
A technique for improving efficiency of error-correction is disclosed for use in a Gray-coded multilevel transmission system and, specifically, in a quadrature amplitude modulation (QAM) transmission system. To this end, information bits in information bit symbols are converted, i.e., mapped, into error-correction bit symbols having fewer bits than the corresponding information bit symbols. This bit-converting technique permits use of encoders and decoders having a code rate lower than the overall transmission code rate.

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E. L. Cusack, "Error Control Codes for QAM Signalling", Electronics Letters, vol. 20, No. 2, Jan. 19, 1984, pp. 62-63.

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