Error-correction coding for multilevel transmission system

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

H - Electricity

04

B

325/50, 325/56,

H04B 1/04 (2006.01) H03M 13/25 (2006.01) H04B 1/16 (2006.01) H04L 27/34 (2006.01)

Patent

CA 1242766

- 29 - ERROR-CORRECTION CODING FOR MULTILEVEL TRANSMISSION SYSTEM Abstract A technique for improving efficiency of error- correction coding 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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