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The compound behavior of the magnetic recording channel is modelled by combining the Lorentzian read-back pulse, the microtrack channel model, and additive white Gaussian noise (AWGN). By noting that at the output of this model the read-back signal is cyclostationary, the average autocorrelation function and corresponding power spectral density over one period are computed. The average power spectral density is then used to characterize the capacity of the magnetic recording channel for various linear density and media noise scenarios by using the conjectured Shamai-Laroia lower bound. It is shown that from a capacity point of view media noise in certain cases is beneficial compared to AWGN.
By: Dieter Arnold and Evangelos Eleftheriou
Published in: IEEE Transactions on Magnetics, volume 38, (no 5), pages 2319-21 in 2002
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