For an ultrahigh areal-density bit-patterned magnetic recording, system performance is severely degraded by intertrack interference (ITI). Rate-4/5 and rate-5/6 modulation codes were introduced to avoid data patterns that can cause severe ITI. However, their decoders might not be able to correctly perform for data patterns that do not match with their look-up tables during the decoding process. To further improve system performance, we use a multitrack joint two-dimensional (2-D) Viterbi detector for the recommended systems. We also use a modified trellis structure with lower complexity when compared to a conventional joint 2-D detector, which is designed based on their encoding conditions. Simulation results show that our systems outperform the conventional system, especially when they are investigated in a media-noise environment.

中文翻译：

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位模式磁记录系统中速率 4/5 和 -5/6 调制码的改进多轨联合二维维特比检测器

对于超高面密度位模式磁记录，轨道间干扰 (ITI) 会严重降低系统性能。引入了速率 4/5 和速率 5/6 调制代码以避免可能导致严重 ITI 的数据模式。但是，他们的解码器可能无法正确执行解码过程中与查找表不匹配的数据模式。为了进一步提高系统性能，我们为推荐系统使用了多轨联合二维 (2-D) Viterbi 检测器。与基于编码条件设计的传统联合二维检测器相比，我们还使用了具有较低复杂性的改进网格结构。仿真结果表明，我们的系统优于传统系统，尤其是在媒体噪声环境中进行研究时。