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EnglishIn this paper an improved decision feedback equalizer (DFE) for mobile orthogonal frequency division modulation (OFDM) systems is presented. The time-varying nature of the channel, due to the Doppler effect, produces inter carrier interference (ICI) that may be counteracted by using a DFE frequency-domain OFDM symbol equalizer. The proposed algorithm is base on a recently proposed block DFE equalizer exploiting an LDL decomposition. The main novelty of this work is the idea to modify the backward filter in order to have a complete MMSE linear equalization before the decisions needed for the interference cancellation. Performance may be further improved by re-filtering the signal in an iterative algorithm which makes use of the proposed backward filter at the first iteration. The proposed scheme performance is evaluated by considering a mobile WiMAX IEEE 812.16e standard transceiver.
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| Titolo: | Improved Block DFE Equalization for Mobile WiMAX OFDM Systems |
| Autori: | |
| Data di pubblicazione: | 2007 |
| Abstract: | In this paper an improved decision feedback equalizer (DFE) for mobile orthogonal frequency division modulation (OFDM) systems is presented. The time-varying nature of the channel, due to the Doppler effect, produces inter carrier interference (ICI) that may be counteracted by using a DFE frequency-domain OFDM symbol equalizer. The proposed algorithm is base on a recently proposed block DFE equalizer exploiting an LDL decomposition. The main novelty of this work is the idea to modify the backward filter in order to have a complete MMSE linear equalization before the decisions needed for the interference cancellation. Performance may be further improved by re-filtering the signal in an iterative algorithm which makes use of the proposed backward filter at the first iteration. The proposed scheme performance is evaluated by considering a mobile WiMAX IEEE 812.16e standard transceiver. |
| Handle: | http://hdl.handle.net/11571/32040 |
| ISBN: | 1424410436 |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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