Low-Complexity Banded Equalizers for OFDM Systems in Doppler Spread Channels

Title

Low-Complexity Banded Equalizers for OFDM Systems in Doppler Spread Channels

 Author

Rugini, L.
Banelli, P.
Leus, G.

Faculty

Electrical Engineering, Mathematics and Computer Science

 Date

2006

 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.

 To reference this document use:

http://resolver.tudelft.nl/uuid:74c71bdc-88ad-4312-9c01-f37ecc18b022

 Publisher

Hindawi Publishing Corporation

 ISSN

1687-6180

 Source

EURASIP Journal on Applied Signal Processing, 2006

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

(c) 2006 Rugini, L.; Banelli, P.; Leus, G.
Files
PDF Low-Complexity Banded Equ ... annels.pdf 913.73 KB
Close viewer