Multidimensional Signal Processing for High Areal Density Heated-Dot Magnetic Recording

A new signal processing scheme for the heated-dot magnetic recording (HDMR) system with double-layered bit-patterned media (BPM) is proposed in this research. This proposed signal processing scheme is applicable to multi-track recording system and uses two cascaded one-dimensional (1D) log-likelihood ratio (LLR) detectors. The proposed scheme is capable of detecting data sequences recorded on two tracks simultaneously and detects the data sequence recorded on each layer in order. The effective transmission rate of the HDMR system with two-track simultaneous detection and double-layered BPM can be increased four times that of the HDMR system with single-layered BPM. It is shown that the error rate performance of the HDMR system with 1D LLR two-track simultaneous detection and double-layered BPM shows a significant improvement over the HDMR system with the conventional 1D LLR detection and single-layered BPM by computer simulation.