Low-Complexity Equalizer for OFDM Systems in Doubly-Selective Fading Channels

Namjeong LEE  Hoojin LEE  Joonhyuk KANG  Gye-Tae GIL  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.3   pp.1031-1034
Publication Date: 2009/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.1031
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDM,  equalization,  time varying channel,  intercarrier interference,  

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In this letter, we propose a computationally effient equalization technique that employs block minimum mean squared error (MMSE) depending on LDLH factorization. Parallel interference cancellation (PIC) is executed with pre- obtained output to provide more reliable symbol detection. In particular, the band structure of the frequency domain channel matrix is exploited to reduce the implementation complexity. It is shown through computer simulation that the proposed technique requires lower complexity than the conventional algorithm to obtain the same performance, and that it exhibits better performance than the conventional counterpart when the same complexity is assumed.