Two-dimensional coding for a multi-track recording system to combat inter-track interference

Constructive inter-track interference (CITI) codes for perpendicular magnetic recording

“…Previous work in reducing the effect of adjacent transitions solved the problem by constraining the system so that no adjacent transitions occurred [8][9][10]. This resulted in a large rate loss for achievable codes.…”

“…Previous work that looked at this for longitudinal recording channels include Refs. [1][2][3][4][5][6][7][8][9][10]. Multi-track recording codes that control the type of adjacent transition can significantly affect error performance in the presence of ATI [11].…”

Graph-Based Channel Detection for Multitrack Recording Channels

“…Each factor node represents an output signal and each bit node denotes a written bit to be recovered. The factor nodes are connected to the bit nodes through the channel model given in (7). We note that, the factor node degree and the bit node degree are both equal to 6 for the 2PR4 target.…”

“…Such methods not only offer a better performance by suppressing the ITI and ISI efficiently but also increase efficiency in control information overhead. So far, multihead multitrack recording has been proposed in the context of conventional media recording systems, and several studies have been reported [1][2][3][4][5][6][7][8][9][10][11].…”

Iterative decoding and equalization for 2-D recording channels

“…Vettiger et al [8] describe the use of a 2-D array of atomic force microscope tips for reading and writing, which potentially can be modified to magnetic force microscope tips. Multitrack recording [9], [10] provides another way of simultaneously reading or writing on several tracks. The organization of the paper is as follows.…”