Method and system for equalizing digital signals using partial response maximum likelihood sequence equalization

Abstract

A test system implemented method of equalizing a digital signal under test (SUT) results in a waveform representation of the output of a Partial Response Maximum Likelihood Sequence Equalizer (PR-MLSE). The method includes applying the SUT, having greater than one symbol period of inter-symbol interference (ISI), to a feed forward equalizer to obtain a Partial Response equalized sequence rk having an ISI characterized as (1+αD), wherein rk denotes the kth equalized sample of the waveform, sampled at the symbol rate, and α is a programmable variable. The method further includes obtaining a known symbol sequence, mk, as a user input to the system, and determining y(capped)k, the kth sample of the PR-MLSE equivalent waveform, in accordance with the following equation, y ˆ k = r k + α ⁢ r k + 1 - α ⁡ ( m k - 1 + m k + 1 ) 1 + α 2 .

Dependencies are inferred from the claim text.