Abstract :
Although patterned media storage (PMS) is a promising candidate for ultrahigh-capacity magnetic data storage, as the capacity of PMS increases, the bit error rate (BER) performance of the system is degraded by increased two-dimensional intersymbol interference (2D-ISI), which results from intertrack interference (ITI), intersymbol interference (ISI), and noise. To improve the system performance under these adverse effects and to increase the capacity, in this paper, we propose to use and/or devise two-dimensional equalization/detection techniques: iterative decision feedback detection (IDFD) and two-dimensional generalized partial response equalization, which is optimized in minimum mean square error (MMSE), followed by one-dimensional Viterbi algorithm (2D-GPR/1D-VA). We evaluate the performance of the proposed methods by using numerical experiments under different amounts of 2D-ISI and noise. Simulation results suggest that under high storage density, the performance of the IDFD is improved by using more iterations and that under the same computational load, 2D-GPR/1D-VA performs better than IDFD. 2D-GPR/1D-VA, therefore, is a good candidate for ultrahigh-capacity PMS.
Keywords :
error statistics; intersymbol interference; iterative methods; least mean squares methods; magnetic recording; magnetic storage; 1D Viterbi algorithm; 2D detection; 2D generalized partial response equalization; 2D intersymbol interference; bit error rate performance; intertrack interference; iterative decision feedback detection; minimum mean square error; patterned media storage; storage density; ultrahigh-capacity magnetic data storage; Intersymbol interference; patterned media; two-dimensional equalization/detection;