Equalized maximum likelihood receiver in a magnetic recording channel

As the length of a channel response increases, the complexity of implementing the Maximum Likelihood Sequence Detector (MLSD) grows exponentially. Equalized Maximum Likelihood (EML) has been proposed to approach optimum performance with significantly reduced complexity. In this scheme, the performance degradation due to the colored error sequence is taken into account. A comparison with Partial Response Maximum Likelihood (PRML) is made for a magnetic recording channel. Our results indicate that better performance can be achieved with reduced complexity especially at high recording densities