Title :
Low Complexity MMSE-SIC Equalizer Employing Time-Domain Recursion for OFDM Systems
Author :
Park, Ji-Hyun ; Whang, Younghoon ; Kim, Kwang Soon
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
fDate :
6/30/1905 12:00:00 AM
Abstract :
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.
Keywords :
OFDM modulation; computational complexity; equalisers; intercarrier interference; interference suppression; least mean squares methods; multipath channels; recursion method; time-domain analysis; time-varying channels; OFDM systems; channel equalizer; complexity analysis; intercarrier interference suppression; low complexity MMSE-SIC equalizer; minimum-mean-squared error; orthogonal frequency division multiplexing systems; successive interference cancellation; time-domain recursion; time-domain recursive algorithm; time-varying multipath channels; AWGN; Equalizers; Information technology; Interference cancellation; Interference suppression; OFDM; Silicon carbide; Sparse matrices; Time domain analysis; Time varying systems; Equalization; minimum-mean-squared error with successive interference cancellation (MMSE-SIC); orthogonal frequency division multiplexing (OFDM);
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2008.2003991
