A NEW TURBO EQUALIZER WITH LINEAR COMPLEXITY (MonPmPO1)

Author(s) : Dimitris Ampeliotis (University of Patras, Greece) Kostas Berberidis (University of Patras, Greece)

Abstract : In this paper a new soft input - soft output (SISO) equalizer of linear complexity is developed. The algorithm can be used in the so-called Turbo equalization scheme as a low cost solution in place of the Maximum A-Posteriori (MAP) equalization algorithm which has a prohibitive complexity for most real world applications. The proposed equalizer consists of two parts, namely, a Soft Interference Canceller (SIC) and a pre-processing part which is a new Variable-Threshold Decision Feedback Equalizer (VTDFE). The role of the second part is to increase the amount of a-priori information supplied to the SIC. Simulation results have shown that the proposed turbo equalizer exhibits a superior performance as compared to the turbo equalization scheme based on the conventional SIC as well as other linear complexity SISO equalizers.

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