Matched Spectral-Null Code with Run-Length Limitation for Optical Recording Channels

High track-density recording and multi-layer recording have been investigated for large capacity optical recording discs. In this case, the recorded data will be reproduced under the low signal-to-noise ratio (SNR) condition due to crosstalk from the adjacent tracks or the other layers, and robust data detection will be required. In this paper, a novel matched spectral-null (MSN) code providing the property of run-length limitation (RLL) was described considering the optical recording channels. Trellis Coded partial response maximum likelihood (TCPRML) employing the MSN code with RLL was also proposed for the data detection method enhancing the minimum Euclidian distance. The detection performance was estimated through the simulation model, which emulates the optical recording channels based on the blu-ray disc (BD) specification.