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Low-Complexity Banded Equalizers for OFDM Systems in Doppler Spread Channels (2006)
| Citations: | 25 - 13 self |
BibTeX
@MISC{Rugini06low-complexitybanded,
author = {Luca Rugini and Paolo Banelli and Geert Leus},
title = { Low-Complexity Banded Equalizers for OFDM Systems in Doppler Spread Channels},
year = {2006}
}
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Abstract
Recently, several approaches have been proposed for the equalization of orthogonal frequency-division multiplexing (OFDM) signals in challenging high-mobility scenarios. Among them, a minimum mean-squared error (MMSE) block linear equalizer (BLE), based on a band LDL factorization, is particularly attractive for its good tradeoff between performance and complexity. This paper extends this approach towards two directions. First, we boost the BER performance of the BLE by designing a receiver window specially tailored to the band LDL factorization. Second, we design an MMSE block decision-feedback equalizer (BDFE) that can be modified to support receiver windowing. All the proposed banded equalizers share a similar computational complexity, which is linear in the number of subcarriers. Simulation results show that the proposed receiver architectures are effective in reducing the BER performance degradation caused by the intercarrier interference (ICI) generated by time-varying channels. We also consider a basis expansion model (BEM) channel estimation approach, to establish its impact on the BER performance of the proposed banded equalizers.
Keyphrases
ofdm system doppler spread channel low-complexity banded equalizer band ldl factorization ber performance original work block linear equalizer high-mobility scenario mmse block decision-feedback equalizer time-varying channel receiver windowing receiver architecture creative common attribution license equalizer share several approach basis expansion model channel estimation approach unrestricted use orthogonal frequency-division multiplexing good tradeoff luca rugini minimum mean-squared error receiver window similar computational complexity simulation result ber performance degradation open access article
