The impact of FFT size on the performance of a combined OFDM-equalization radio modem

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Conventional OFDM systems employ a guard interval to combat delay spread distortion of transmitted data. This reduces the efficiency of the OFDM transmission. A combined OFDM-equalization transmission 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 efficiency of the OFDM transmission is improved. This paper presents the combined OFDM-equalization techique and demonstrates the efficiency improvement that it offers over conventional OFDM. The performance of the pre-FFT equalizer is sensitive to time variation of the mobile radio channel's impulse response. Software simulation is employed to analyze this sensitivity and a relationship is determined between performance and FFT size. The results are considered in the context of application to existing and future mobile radio systems
Translated title of the contributionThe impact of FFT size on the performance of a combined OFDM-equalization radio modem
Original languageEnglish
Title of host publicationVehicular Technology Conference, 1999 (VTC-Fall 1999), Amsterdam
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1506 - 1510
ISBN (Print)0780354354
Publication statusPublished - Sept 1999
Event50th Vehicular Technology Conference 1999 - Amsterdam, Netherlands
Duration: 1 Sept 1999 → …


Conference50th Vehicular Technology Conference 1999
Abbreviated titleVTC-Fall 1999
Period1/09/99 → …

Bibliographical note

Conference Proceedings/Title of Journal: IEEE VTS 50th Vehicular Technology Conference, 1999 (VTC-Fall 1999)
Rose publication type: Conference contribution

Sponsorship: The authors would like to thank News Digital
Systems (NDS) for their financial support of this project. In particular, we would like to thank Arthur Mason OBE and his colleagues for their enthusiastic support and comments throughout the project

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  • OFDM modulation
  • adaptive equalisers
  • delays
  • fast Fourier transforms
  • land mobile radio


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