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- W2022146516 abstract "For rate R=1/2 convolutional codes with 16 states there exists a gap between Heller's (1968) upper bound on the free distance and its optimal value. This article reports on the construction of 16-state, binary, rate R=2/4 nonlinear trellis and convolutional codes having d/sub free/=8; a free distance that meets the Heller upper bound. The nonlinear trellis code is constructed from a 16-state, rate R=1/2 convolutional code over Z/sub 4/ using the Gray map to obtain a binary code. Both convolutional codes are obtained by computer search. Systematic feedback encoders for both codes are potential candidates for use in combination with iterative decoding. Regarded as modulation codes for 4-PSK, these codes have free squared Euclidean distance d/sub E, free//sup 2/=16." @default.
- W2022146516 created "2016-06-24" @default.
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- W2022146516 date "1998-07-01" @default.
- W2022146516 modified "2023-09-23" @default.
- W2022146516 title "Two 16-state, rate R=2/4 trellis codes whose free distances meet the Heller bound" @default.
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- W2022146516 doi "https://doi.org/10.1109/18.681337" @default.
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