Error-correction system for two-dimensional multilevel signals

Details Error-correction system for two-dimensional multilevel signals Error-correction system for two-dimensional multilevel signals

1983-09-16

1985-11-12

Atkinson, Charles E.

Excavating

371 43, 375 27, G06F 1110, H04L 512

Patent

active

045532370

ABSTRACT:
Disclosed is an error correction system in which part of the data bits of first multilevel input data is differentially encoded to form second data comprising the differentially encoded data bits and the remainder data bits and converting the bit patterns of the second data into third data in two-dimensional multilevel signal space according to a predetermined transfer function. A transparent error-correcting code is derived from each of the different phases of the third data and appended to each different phase to thereby form fourth data which is then modulated upon a carrier in two-dimensional multilevel signal space for transmission to a receiver where the signal is demodulated to recover the fourth data. The appended error-correcting code is separated from each different phase of the fourth data. An error which might exist in the received data is corrected by the separated error-correcting code in respect of each phase. The bit pattern of the error-corrected data is reconverted to recover the original second data. One of the phases of the second data is differentially decoded to recover the original first data.

REFERENCES:
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patent: 4483012 (1984-11-01), Wei
G. D. Forney, Jr. et al., A High-Speed Sequential Decoder: Prototype Design and Test, IEEE Trans. on Comm. Technology, vol. COM-19, No. 5, Oct. 1971, pp. 821-835.

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