Improving the spectral efficiency for the OFDM system using the time and frequency domain equalization

Keukjoon Bang, Namshin Cho, Kilnam Oh, Jaehong Park, Daesik Hong

Research output: Contribution to journalConference articlepeer-review


In an OFDM system, data symbols are transmitted in parallel over multiple subchannels with a long symbol duration. A simple equalizer is expected to yield satisfactory results provided that it uses a sufficiently long guard interval. But a long guard interval results in an excessive prolongation of the symbol duration and thus in bandwidth efficiency loss. In this article, we propose the dual equalization in both time and frequency domain. Thus it is possible to shorten the guard interval while maintaining the bit error rate performance or improve the bit error rate performance while maintaining the guard interval. DFE (Decision Feedback Equalization) is introduced for time-domain equalization while conventional 1-tap linear equalizers are used for frequency-domain equalization. Simulation results show the effectiveness of the proposed algorithm on the multipath channel specified in ETSI Draft prETS 300 744.

Original languageEnglish
Pages (from-to)468-469
Number of pages2
JournalDigest of Technical Papers - IEEE International Conference on Consumer Electronics
Publication statusPublished - 1998
EventProceedings of the 1998 17th Conference on Consumer Electronics - Los Angeles, CA, USA
Duration: 1998 Jun 21998 Jun 4

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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