PRML方式における非線形要因のビットエラーレートへの影響

概要

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In MR heads, read-nonlinearity and wite-nonlinearily, which is manifested in phenomena such as nonlinear transition shift (NLTS), degrade the bit error rate (BER)performance in a PRML read channel. We discuss a simple method of estimating these nonlinearity effects for a PRML read channel, and compare the calculated and experimental results. In a PRML read channel, the BER can be easily calculation from the noise deviation after the equalization, and the nonlinearities increasethe the noise deviation. The calculation and experimental results show a proportional relationship between the noise deviation due to read nonlinearity and the absolute value of the amplitude asymmetry, The deviation due to NLTS can be calculated by considering the first and second adjacent transition shifts and write precompensation. The total effects of The nonlinearites are easily calculated by adding the squares of all the noise deviations.
社団法人日本磁気学会の論文
1998-04-15