Excavating
Patent
1987-01-15
1988-08-02
Smith, Jerry
Excavating
332 9R, G06F 1110
Patent
active
047617845
ABSTRACT:
Disclosed is a modem including a transmitter having a convolutional encoder for transforming each group interval digital data into an expanded bit sequence having symbol-selecting bits and a frame of subset-selecting bits forming a plurality of bit groups, with each bit group designating a 2-dimensional subset and the symbol-selecting bits being used to select one 2-dimensional symbol from each of the selected subsets, the transmitter further providing modulation of a carrier signal, and a receiver wherein a commonality-seeking, branch cost calculator determines the candidate branch associated with the minimum cost N-dimensional symbol subset for each coset and a Viterbi decoder which determines the maximum likelihood path from a plurality of surviving paths formed from branches selected from the candidate branches.
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patent: 4457004 (1984-06-01), Gersho
patent: 4581601 (1986-04-01), Calderbank et al.
patent: 4597090 (1986-06-01), Forney
patent: 4700349 (1987-10-01), Gallager
patent: 4709377 (1987-11-01), Martinez
Forney, David G. et al., "Efficient Modulation for Band Limited Channels", IEEE Journal on Selected Areas in Communication, vol. SAC, Sep. 2, 1984, pp. 632-645.
Farias Luis V.
Krishnan Vedavalli G.
Pruett James D.
Srinivasagopalan Rangarajan
Beausoliel Robert W.
Newton William A.
Racal Data Communications Inc.
Smith Jerry
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