Improvement of Error Rate Performance by Write and Read Equalization and Viterbi Decoding

Abstract

DC freeing of the write waveform is an important technique in digital magnetic recording. The higher the recording density is, the stronger the effect of high frequency noise becomes. We use the DC-freeing technique of write equalization to boost high frequency on the write side, and read equalization with which we can reduce high-frequency noise with little degradation of the eye opening, is adopted on the read side. In addition, we adopt Viterbi decoding as a decoding method for further improvement. In this paper, we report the synthesis of this write and read equalization method. Computer simulation shows that our system has an excellent error rate performance compared with the well-known combination of NRZ recording code and integrated detection.