Signal processing for crosstalk in narrow track HDD

叠瓦式磁记录正被应用于在HDD中实现窄磁道记录。在该系统中，道间干扰是由于在记录时跟随道与引导道重叠而产生的，串扰是由于阅读器的灵敏度延伸到相邻道中而产生的。为了观察这一现象，我们制作了一个读写模拟器，用写磁头在计算机制作的颗粒介质上记录数据序列，用读磁头从介质上获得波形。对磁性颗粒的信号和噪声成分进行了可视化，并阐明了其对信号处理的影响。此外，还阐明了二维神经元抵消器和使用非二进制低密度奇偶校验码的迭代译码等信号处理系统的性能。

Shingled magnetic recording is being applied to achieve narrow-track recording in HDD. In the system, Intertrack interference arises due to overwriting the following track on the leading track at recording as well as cross-talk due to the sensitivity of reader extending into the adjacent tracks. To observe the phenomena, we made a R/W simulator which records data sequence on a granular media made in computer by write head and obtain the waveform from the media by read head. Signal and noise components are visualized for magnetic grains, and the influence to signal processing is clarified. In addition the performance of signal processing systems such as two-dimensional neuro-canceller and iterative decoding using non-binary low-density parity-check code is clarified.