Method and apparatus for coding a binary signal

Pulse or digital communications – Repeaters – Testing

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340347DD, 375 59, H04L 300

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045340404

ABSTRACT:
An input bit sequence is encoded for transmission on a QAM carrier by dividing a scrambled version of the input sequence into groups of N consecutive bits. Each group is then subdivided into first and second subsets of r and r.sup.1 bits, where r+r.sup.1 =N. At least one of the bits in the first subset is applied to a finite state machine (such as a convolution encoder) which is arranged to expand the applied bits by at least one additional bit, in accordance with a prescribed logic arrangement. At least one bit in the second subset is processed similarly but independently, using a different finite state machine, or by time sharing a single finite state encoder. The expanded bit subsets, which include at least r+1 and r.sup.1 +1 bits, respectively, are then mapped into in-phase and quadrature symbols such that the minimum euclidean distance for an error event is larger than that obtained from an uncoded system. The symbols to be transmitted are then filtered and the filter output is modulated using conventional QAM methods.

REFERENCES:
patent: 3883727 (1975-05-01), Stuart et al.
patent: 3971996 (1976-07-01), Motley et al.
patent: 4003041 (1977-01-01), van Duuren et al.
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4123710 (1978-10-01), Stuart et al.
"Analog Transmission Performance on the Switched Telecommunications Network", The Bell System Technical Journal, vol. 50, No. 4, Apr. 1971, pp. 1311-1347.
"Channel Coding with Multilevel/Phase Signals", IEEE Trans. on Information Theory, vol. IT-28, No. 1, Jan. 1982, pp. 55-67.
"Viterbi Decoding for Satellite and Space Communication", IEEE Trans. on Comm. Tech., vol. COM-19, No. 5, Oct. 1971, pp. 835-848.
"The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, pp. 268-278.

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