Multicarrier equalization by subchannel SINR maximization

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In multicarrier (MC) communication receivers, the use of a time-domain equalizer (TEQ) mitigates inter-symbol and inter-carrier interferences by shortening the overall channel delay spread. Nevertheless, the TEQ-based MC-receiver structure does not result in optimal bit rate and if one wants to optimize the bit rate a nonlinear cost function has to be maximized. Hence, to optimize the MC system bit rate, we aim to equalize each subchannel separately by maximizing its Signal-to-Interference and Noise Ratio (SINR). The proposed approach is based on exact and accurate model of the subchannel SINR. Optimal equalizers are then designed in the case of ADSL environment where numerical simulation confirms the improvement in performance of the proposed approach with respect to previous methods.