Detection techniques for high-density magnetic recording

被引:8
|
作者
Sun, HL
Mathew, G
Farhang-Boroujeny, B
机构
[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore
[2] Data Storage Inst, Singapore 117608, Singapore
[3] Univ Utah, Dept Elect Engn, Salt Lake City, UT 84112 USA
关键词
channel nonlinearities; magnetic recording; media noise; PR target design; signal-dependent distortions; Viterbi detection;
D O I
10.1109/TMAG.2004.843309
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we present techniques for improving the performance of Viterbi detector in the presence of channel nonlinearities and media noise, which are the dominant source of errors in high density magnetic recording channels. Instead of treating these distortions separately, we combine them into a "high-density (HD) noise," which is signal dependent and correlated in nature. To compensate for signal-dependent mean and correlation of HD noise, we modify the branch metrics by subtracting an estimate of the mean from the signals on each branch and optimize the equalization target by minimizing the dominant error event probability, respectively. Simulation results show that these modifications yield significant performance gains.
引用
收藏
页码:1193 / 1199
页数:7
相关论文
共 50 条