The Effects of Modulation Code Rate and Channel Pulses on Noise Margin of the Magnetic Recording Channel

Abstract

In this article, we present an overview of architecture of the read channel chip and the effectsof modulation code rates and channel types to the noise margin, an important parameter in themagnetic recording system. The noise margin is adjusted by varying the noise level to the WRITE bitstreams for each code rate and channel type. The experimental results show that required noise marginis higher as the data rate increases and the partial response IV channel can withstand higher noiselevel than the Lorentzian pulse.