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Low-Complexity Equalizer for OFDM Systems in Doubly-Selective Fading Channels
Namjeong LEE Hoojin LEE Joonhyuk KANG Gye-Tae GIL
IEICE TRANSACTIONS on Communications
Publication Date: 2009/03/01
Online ISSN: 1745-1345
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.