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Low Complexity MMSE-SIC Equalizer Employing Time-Domain Recursion for OFDM Systems

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3 Author(s)
Ji-Hyun Park ; Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul ; Younghoon Whang ; Kwang Soon Kim

In this letter, a novel time-domain recursive algorithm is proposed for a minimum-mean-squared error (MMSE) with successive interference cancellation (SIC) scheme. This algorithm allows us to reduce the complexity of classical MMSE-SIC equalizer for suppressing intercarrier interference (ICI) caused by time-varying multipath channels in orthogonal frequency division multiplexing (OFDM) systems, and it can provide almost the same performance as that of the optimal MMSE-SIC equalizer. It is shown in complexity analysis that the proposed scheme shows better complexity reduction than previously reported low-complexity MMSE-SIC schemes when applied to a channel equalizer for an OFDM system.

Published in:

Signal Processing Letters, IEEE  (Volume:15 )

Date of Publication:

2008

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