To achieve ultra-high areal densities in future magnetic recording technologies such as bit-patterned magnetic recording (BPMR) systems, each bit-island must be closely moved. However, the reduction of bit island spac...
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To achieve ultra-high areal densities in future magnetic recording technologies such as bit-patterned magnetic recording (BPMR) systems, each bit-island must be closely moved. However, the reduction of bit island spacing always leads to both inter-symbol interference (ISI) and inter-track interference (ITI), which can degenerate system performance. Previously, a one-dimensional (1d) run-length limited (RLL) code was employed to efficiently avoid the ISI effect, while a two-dimensional (2d) detector is widely utilized to deal with the ITI effect as well. However, its complexity is higher than the traditional 1ddetector. Therefore, to avoid the fatal data patterns that lead to severe ITI effect, we first present the application of 1d RLL code to be as the 2d modulation code in the multi-head multi-track BPMR systems. Moreover, we also present the modified2d Viterbi detector that is designed based on our proposed encoding condition. The numbers of state and branch in the traditional trellis's structure are properly reduced according to encoding condition, thus it does not only provide a lower complexity but also operate better than the traditional 2d Viterbi detector. Results reveal that our proposedcodingscheme and modified2d Viterbi detector can efficiently protect and cope with the ITI effect.
In bit patterned magnetic recording (BPMR), The two-dimensional (2d) interference composed of inter-symbol and inter-track interference is a major problem especially at high areal density (Ad). One way to alleviate th...
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ISBN:
(纸本)9786163618238
In bit patterned magnetic recording (BPMR), The two-dimensional (2d) interference composed of inter-symbol and inter-track interference is a major problem especially at high areal density (Ad). One way to alleviate the destructive effect of 2d interference is to deploy a 2d coding scheme on an input data sequence before recording in order to avoid some data patterns that easily cause an error at the data readback process. However, some codingschemes generate high complexity. Consequently, this paper proposes a new low-complexity modulation code with redundant bits to eliminate the data patterns leading to severe 2d interference and compare overall system performance. Experimental results indicate that the system with the proposed code is superior to that without coding, especially when the Ad is high and/or the position jitter is large.
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