Pulse or digital communications – Repeaters – Testing
Patent
1990-04-10
1992-12-01
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
371 375, H04L 0512
Patent
active
051685094
ABSTRACT:
In a multi-level QAM communication system, Reed-Solomon encoders and Reed-Solomon decoders are employed for error correction purposes. The phase ambiguity of the received signal is eliminated with differential coding. The multi-level QAM communication system utilizing n bits ("n" being an integer) QAM signal having 2.sup.n signal points, comprises: a quadrature differential encoder/decoder unit for differentially encoding/decoding n pieces of input digital signal series to produce n pieces of differentially coded signal series; an error correction unit including a Reed-Solomon encoder and a Reed-Solomon decoder, provided inside the quadrature differential encoder/decoder unit along a signal processing path of the input digital signal series, for error-correcting the n pieces of differentially-coded signal series by utilizing at least one of the digital signal series with employment of a Reed-Solomon code; and, a QAM modulator/demodulator unit for QAM-modulating/demodulating n pieces of error-corrected signal series so as to produce 2.sup.n QAM signals.
REFERENCES:
patent: 4553237 (1985-11-01), Nakamura
IEEE Transactions on Communication Technology, vol. COM-19, No. 5, pp. 8212-8835, "A High-Speed Sequential Decoder: Prototype Design and Test", G. D. Forney, et al., Oct. 1971.
Proceedings of International Conference on Communications, pp. 1472-1477 (F2.4), "6GHz 135MBPS Digital Radio System With 64 QAM Modulation", T. Noguchi, et al., 1983.
Proceedings of International Conference on Communications, pp. 1482-1486 (46.7), "6GHZ 140MBPS Digital Radio Repeater With 256QAM Modulation", Y. Yoshida, et al., 1986.
Lin, et al., Error Control Coding Fundamentals and Applications, Prentice-Hall, Inc., N.J., 1983, pp. 34-39, 85.gtoreq.93, 141-151, and 170-177.
Kodama Tomoko
Nakamura Makoto
Ghebretinsae T.
Kabushiki Kaisha Toshiba
Kuntz Curtis
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