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- W3123138835 abstract "We consider codes for channels with extreme noise that emerge in various low-power applications. Simple LDPC-type codes with parity checks of weight 3 are first studied for any dimension $mrightarrowinfty.$ These codes form modulation schemes: they improve the original channel output for any $SNR>$ $-6$ dB (per information bit) and gain $3$ dB over uncoded modulation as $SNR$ grows. However, they also have a floor on the output bit error rate (BER) irrespective of their length. Tight lower and upper bounds, which are virtually identical to simulation results, are then obtained for BER at any SNR. We also study a combined scheme that splits $m$ information bits into $b$ blocks and protects each with some polar code. Decoding moves back and forth between polar and LDPC codes, every time using a polar code of a higher rate. For a sufficiently large constant $b$ and $mrightarrowinfty$, this design yields a vanishing BER at any SNR that is arbitrarily close to the Shannon limit of -1.59 dB. Unlike other existing designs, this scheme has polynomial complexity of order $mln m$ per information bit." @default.
- W3123138835 created "2021-02-01" @default.
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- W3123138835 date "2021-01-25" @default.
- W3123138835 modified "2023-09-27" @default.
- W3123138835 title "Codes approaching the Shannon limit with polynomial complexity per information bit" @default.
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