Research Article
Jointly Channel Estimation/Equalization and Subtraction of PN-ISI for TDS-OFDM Systems Over Frequency-Selective Fading Channels
@INPROCEEDINGS{10.1109/CHINACOM.2008.4685111, author={Yih-Min Chen and Quei-Ping Liao}, title={Jointly Channel Estimation/Equalization and Subtraction of PN-ISI for TDS-OFDM Systems Over Frequency-Selective Fading Channels}, proceedings={ChinaCom2008-Signal Processing for Communications Symposium}, publisher={IEEE}, proceedings_a={CHINACOM2008-SPC}, year={2008}, month={11}, keywords={TDS-OFDM PN-ISI channel estimation/equalization and frequency-selective fading channels}, doi={10.1109/CHINACOM.2008.4685111} }- Yih-Min Chen
Quei-Ping Liao
Year: 2008
Jointly Channel Estimation/Equalization and Subtraction of PN-ISI for TDS-OFDM Systems Over Frequency-Selective Fading Channels
CHINACOM2008-SPC
IEEE
DOI: 10.1109/CHINACOM.2008.4685111
Abstract
PN-sequence padding scheme has been proposed in TDS-OFDM systems instead of the cyclic prefix scheme in the traditional CP-OFDM systems. The PN-sequence, padded between normal OFDM symbols, has dual functions for assisting in channel estimation and preventing inter-symbol-interference between normal OFDM symbols over frequency-selective fading channel. However there are ISI to the normal OFDM symbols caused by the padding PN-sequence, referred to as PN-ISI. Therefore it is crucial to remove the PN-ISI in TDS-OFDM systems. In this paper, we propose a scheme which performs the channel estimation/equalization and the subtraction of PN-ISI jointly. Comparing to the normal scheme which performs the PN-ISI removal after channel estimation without iteration, the performance of the proposed scheme is shown to be superior with simulations.