1987-05-29
1989-02-21
Fleming, Michael R.
Excavating
371 42, 371 47, 375114, G06F 1110
Patent
active
048072303
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 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 synchronization of received frames of subset-selecting bits is provided by applying a parity check equation to a plurality of possible received frames of subset-selecting bits.
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G. D. Forney, Jr.; R. G. Gallager; G. R. Lang; F. M. Longstaff and S. U. Qureshi, "Efficient Modulation for Band-Limited Channels," IEEE Journal on Selected Areas in Comm., vol. SAC-2, No. 5, pp. 632-645, Sep., 1984.
Pruett James D.
Srinivasagopalan Rangarajan
Fleming Michael R.
Newton William A.
Racal Data Communications Inc.
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