A Novel Iterative Equalization Algorithm Based on Signal Reconstruction for TDS-OFDM/ZP-OFDM Systems over Large Delay-Spread Channels

Author

Ni, Ching-Sheng ; Lee, Yao-Nan ; Cheng, Shin-Shiuan

Author_Institution

Himax Media Solutions Inc., Taipei, Taiwan

fYear

2011

fDate

18-20 April 2011

Firstpage

389

Lastpage

392

Abstract

In this paper, we propose an iterative equalization algorithm for the TDS-OFDM/ZP-OFDM system to mitigate the inter-symbol interference (ISI) incurred by channels with large delay spread. The time-domain signal components polluted by the ISI are replaced with the reconstructed ones, which are generated from the the channel impulse response and the data symbols detected in the latest iteration. Then the so-constructed time-domain synthesized signal is demodulated again. The same procedure is repeated until performance saturates. Significant performance improvement is demonstrated through system simulations, which confirm the effectiveness of the proposed algorithm in combating ISI.

Keywords

OFDM modulation; demodulation; equalisers; intersymbol interference; signal reconstruction; wireless channels; TDS-OFDM system; ZP-OFDM system; channel impulse response; data symbol; intersymbol interference; iterative equalization; large delay-spread channel; signal demodulation; signal reconstruction; time-domain signal component; time-domain synthesized signal; TDSOFDM; ZP-OFDM; add; delay spread; equalization; interference; overlap;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Mobile Computing (CMC), 2011 Third International Conference on

Conference_Location

Qingdao

Print_ISBN

978-1-61284-312-4

Type

conf

DOI

10.1109/CMC.2011.60

Filename

5931256