Frequency-Domain Equalization Incorporated with Frequency-Domain Redundancy for OFDM Systems

• Published in: 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications pp. 1 - 5
• Main Authors: Okazaki, A., Motoyoshi, K., Higashinaka, M., Nagayasu, T., Kubo, H., Shibuya, A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-09-2006
• Subjects: Computational complexity; Equalizers; Finite impulse response filter; Forward error correction; Frequency domain analysis; Interference suppression; Mean square error methods; Mobile communication; OFDM; Redundancy
• DOI: 10.1109/PIMRC.2006.254430
• ISBN: 9781424403295; 1424403294
• ISSN: 2166-9570

This paper proposes a frequency-domain equalizer (FEQ) which utilizes not only guard interval but also redundancy in the frequency domain to eliminate inter-symbol and intercarrier interferences. The proposed FEQ employs the hybrid criterion, i.e., the zero-forcing (ZF) criterion for compensating desired subcarriers and the minimum mean square error (MMSE) criterion for suppressing interference. The proposed hybrid-FEQ achieves a good equalization performance, because it can suppress the noise enhancement caused by the ZF criterion with relatively small computational complexity exploiting soft-decision forward error correction (FEC). In this paper, we show its equalization performance and complexity compared with the conventional FEQs