Bounds on variances of recovery times of decision feedback equalizers

New upper and lower bounds on the variances of the recovery times of decisi on feedback equalizers are derived. The analysis is based on generalizing a difference equation technique, used previously only for first-order moment s, to second-order moments. The different error recovery time variances res ulting from random channel errors and from the reset or startup condition a re both investigated. The cases of noisy and noiseless operating conditions are studied and the influence of the closing of the sampling eye is invest igated.