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Performance analysis of a pre-FFT equalizer design for DVB-T

Research output: Contribution to journalArticle

Original languageEnglish
Pages544 - 552
JournalIEEE Transactions on Consumer Electronics
Journal publication dateNov 1999
Journal issue3
Volume45
DOIs
StatePublished

Abstract

Conventional OFDM systems employ a guard interval to combat delay spread distortion of the transmitted data. This reduces the efficiency of the OFDM transmission. A combined OFDM-equalization reception strategy is presented in this paper. This strategy employs an adaptive equalizer to combat delay spread distortion instead of a guard interval. This facilitates the use of very short guard intervals and thus the transmission efficiency of the OFDM modulation scheme is improved. This paper presents the combined OFDM-equalization receiver and the pre-FFT equalizer designs. The efficiency of both the conventional OFDM and combined OFDM-equalization strategies is considered and it is demonstrated that combined OFDM-equalization offers a significant improvement in transmission efficiency. The transmission of OFDM signals in single frequency networks is considered and it is shown that the combined OFDM-equalization technique is particularly effective for such applications, offering an improvement in bandwidth efficiency of 14% under severe delay spread conditions. The limitations of the combined OFDM-equalization strategy to operate effectively under both additive noise and time variant conditions are considered. The performance is simulated and the sensitivity to this impairment analyzed.

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Terms of use: Copyright © 1999 IEEE. Reprinted from IEEE Transactions on Consumer Electronics. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Publisher: Institute of Electrical and Electronics Engineers (IEEE)

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Research areas

  • OFDM modulation, digital video broadcasting, adaptive equalisers

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