Implementation of an FDTrS/DF signal detector for high-density DVD systems

In this paper, a signal detection technique, called a fixed-delay trellis search with decision feedback (FDTrS/DF), is proposed for high-density DVD systems and implemented with FPGA and ASIC chips. The proposed FDTrS/DF always performs better than the signal detection techniques based on tree search structure such as the fixed-delay tree search with decision feedback (FDTS/DF) and the signal space detection with decision feedback (SSD/DF). Also, the FDTrS/DF can reduce hardware complexity significantly due to the unique structure of FDTrS composed of only one trellis stage, requiring no traceback procedure. The hardware complexity of the proposed FDTrS/DF is further reduced by employing the criterion of the absolute branch metric (instead of square branch metric) and applying a pipelining technique. It is shown by simulation and implementation results that the proposed FDTrS/DF provides the best performance among various signal detection techniques such as PRML, DFE, FDTS/DE and SSD/DF, even with a small hardware complexity