A novel type-based group delay equalization technique

In this paper, we present a patent-pending type-based equalization technique to deal with non-constant group delay response commonly existing in analog/RF circuit of a communication system. Its underlying principle is that, given a modulation scheme and pulse-shaping and/or channel filter, the modulated signal has a unique statistical distribution, and any impairment in the analog/RF circuit distorts its output statistical distribution. The difference between the ideal and the output statistics contains the impairment information, and can be used to design the equalizer. Computer simulations have shown that the type-based technique can accurately determine the equalizer required to effectively equalize the group delay response, thereby significantly improving the system performance.