Amitkumar Mahadevan

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We evaluate the error-correcting performance of a low-density parity-check (LDPC) code in an AWGN channel using a novel dual adaptive importance sampling (DAIS) technique based on multicanonical Monte Carlo (MMC) simulations, that allows us to calculate bit error rates as low as 10−19 for a (96, 50) LDPC code without a priori knowledge of how to bias. Our(More)
This contribution presents a linear off-diagonal MIMO canceller (ODMC) that aims at mitigating the upstream self far-end cross-talk (FEXT) that severely impacts the performance of very high speed digital subscriber line (VDSL) services at the central office (CO). The ODMC operates per frequency and is thus well suited for DMT-based VDSL systems. We(More)
The dual adaptive importance sampling (DAIS) technique allows for the evaluation of the word and bit error rates of linear block forward error correction codes down to extremely low values. This paper presents results from performance evaluation of certain LDPC codes using the DAIS technique. The standard Monte Carlo simulation results and the union bound(More)
We develop an analytical framework to evaluate the probability-of-miss and probability-of-false-alarm performance of an impulse noise (IN) detection algorithm for orthogonal frequency-domain multiplexing (OFDM) symbols based on monitoring the post-frequency-domain-equalizer (FEQ) instantaneous error at the output of the QAM constellation demapper over a(More)
We present cooperative MIMO for alien noise cancellation (CoMAC): a per-tone, blind, low-complexity, linear, and adaptive noise whitening algorithm for alien crosstalk mitigation in upstream vectored VDSL systems. CoMAC directly acts on the residual errors of the vectored users after self-FEXT cancellation and frequency domain equalization, and thus,(More)
We present a design technique for binary weakly-dual codes from which we construct quantum error-correction codes (quantum codes) via the CSS technique. The weakly-dual forward error-correction (FEC) codes are based on diagonals of different slopes on a rectangular η 2 ×η array (type-R array) with η even. Some methods to increase the minimum distance of(More)