Recently, a minimum mean-squared error (MMSE) block linear equalizer based on a band LDLH factorization has been proposed for equalization of orthogonal frequency-division multiplexing (OFDM) systems affected by Doppler spread. In this paper, we extend this approach towards two directions. First, we design an MMSE block decision-feedback equalizer (DFE) based on the band LDLH factorization. Both performance and complexity are analyzed. Second, we enhance the performance of the linear equalizer by means of receiver windows tailored to the band LDLH factorization approach. Simulation results show that the proposed techniques are effective in reducing the error floor caused by the intercarrier interference (ICI).
Block DFE and Windowing for Doppler-Affected OFDM Systems
RUGINI, LUCA;BANELLI, Paolo;
2005
Abstract
Recently, a minimum mean-squared error (MMSE) block linear equalizer based on a band LDLH factorization has been proposed for equalization of orthogonal frequency-division multiplexing (OFDM) systems affected by Doppler spread. In this paper, we extend this approach towards two directions. First, we design an MMSE block decision-feedback equalizer (DFE) based on the band LDLH factorization. Both performance and complexity are analyzed. Second, we enhance the performance of the linear equalizer by means of receiver windows tailored to the band LDLH factorization approach. Simulation results show that the proposed techniques are effective in reducing the error floor caused by the intercarrier interference (ICI).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
