Methods and apparatus for rotationally invariant multilevel codi

Details Methods and apparatus for rotationally invariant multilevel codi Methods and apparatus for rotationally invariant multilevel codi

1993-05-03

1996-08-20

Coles, Sr., Edward L.

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375286, 375265, 371 43, 371 371, H04L 2710, H04L 2534, H04L 512, G06F 1110

Patent

active

055486150

ABSTRACT:
A rotationally invariant, multilevel coded modulation scheme is provided by partitioning a constellation, such as an M-PSK or QAM constellation, into several trellis-subsets, each of which is further partitioned into block subsets. The input bits are then encoded to select a signal point from the constellation. A first portion of the input bits are differentially encoded. A second portion of the input bits, together with at least one of the differentially encoded bits, are trellis encoded to select a trellis subset of the constellation. A third portion of the input bits--excluding any differentially encoded bits --are block encoded to select a block subset from the selected trellis subset. A fourth portion of the input bits, together with the remaining differentially encoded bits, are used to select a signal point from the selected block subset.

REFERENCES:
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patent: 5029185 (1991-07-01), Wei
patent: 5307377 (1994-04-01), Chouly et al.
Tretter, "An Eight-Dimensional 64-State Trellis Code for . . ."IEEE Jrnl. Selected Areas In Comm., vol. 7, No. 9, Dec. 89, pp. 1392-95.
Wei "Rotationally Invariant Trellis-Coded Modulations . . .", IEEE Jrnl. Selected Areas In Comm., vol. 7, No. 9, Dec. 89, pp. 1281-9.
Wu et al., "Multilevel Trellis MPSK Modulation Codes For . . .", IEEE Transactions On Comm., vol. 41, No. 9, Sep. 93, pp. 1311-18.

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