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Two-Dimensional Partial Response Maximum Likelihood at Rear for Bit-Patterned Media

机译:位模式介质后部的二维局部响应最大似然

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摘要

Bit-patterned media (BPM) storage can have ultrahigh capacity, whereas the readback signal for the BPM storage is deteriorated by intersymbol interference in both the along- and across-track directions. As a detection method considering the two-dimensional (2D) interference, we propose a new structure of 2D partial response maximum likelihood (PRML) method based on a 2D partial response (PR) target and a 2D soft output Viterbi algorithm (SOVA) composed of two one-dimensional SOVAs. For the purpose of improving the bit error rate (BER) performance and reducing the computational complexity, the proposed method applies a 2D equalizer estimating the binary data recorded on the BPM instead of the output data of the 2D PR target. For this reason, the 2D PRML is located behind the 2D equalizer. Consequently, the proposed method has a superior BER performance as well as a low computational complexity. In addition, we carry out comparison of the BER performance in the 2D PRML according to the use of the least mean square and recursive least square algorithms in the 2D equalizer.
机译:位模式媒体(BPM)存储可以具有超高容量,而BPM存储的回读信号会由于沿磁道方向和跨磁道方向上的符号间干扰而恶化。作为考虑二维(2D)干扰的检测方法,我们提出了一种基于2D部分响应(PR)目标和2D软输出维特比算法(SOVA)的2D部分响应最大似然(PRML)方法的新结构。两个一维SOVA。为了提高误码率(BER)性能并降低计算复杂度,该方法应用了2D均衡器来估计BPM上记录的二进制数据,而不是2D PR目标的输出数据。因此,2D PRML位于2D均衡器的后面。因此,所提出的方法具有优异的BER性能以及较低的计算复杂度。此外,我们根据2D均衡器中最小均方算法和递归最小二乘算法的使用,对2D PRML中的BER性能进行比较。

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