Two new equalisation schemes for high-density digital magnetic recording systems with quad-phase modulation code
Jan W. M. Bergmans, S. Mita · Electronics Letters · 1990
Quad-phase has desirable features for use in digital magnetic recording. Here we propose two novel equalisation schemes that seem attractive at high information densities. One scheme estimates the even and odd data bits in reverse order, while the other uses two equalisers to estimate even and odd bits separately.