H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/106, 325/45
H04B 7/00 (2006.01) H04L 1/00 (2006.01) H04L 27/00 (2006.01) H04L 27/34 (2006.01)
Patent
CA 1207841
"Error-Correction System For Two-dimensional Multilevel Signals" 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 phase 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.
436849
Corporation Nec
Smart & Biggar
LandOfFree
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