Performance Enhancement Schemes of OFDMA System for Broadband Wireless Access

  • Authors:

  • Dong-Hyun Park;So-Young Yeo;Jee-Hoon Kim;Young-Hwan You;Hyoung-Kyu Song

  • Affiliations:

  • uT Communication Research Institute, Sejong University, Seoul, Korea;uT Communication Research Institute, Sejong University, Seoul, Korea;uT Communication Research Institute, Sejong University, Seoul, Korea;uT Communication Research Institute, Sejong University, Seoul, Korea;uT Communication Research Institute, Sejong University, Seoul, Korea

  • Venue:
  • ICCS '07 Proceedings of the 7th international conference on Computational Science, Part IV: ICCS 2007
  • Year:
  • 2007

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Abstract

Orthogonal frequency-division multiple access (OFDMA), which is a combination of orthogonal frequency-division multiplexing (OFDM) with frequency-division multiple access (FDMA), is regarded as a promising solution for enhancing the performance of interactive wireless systems in ubiquitous mobile communication environment. In such an application, this paper presents an investigation into improving the channel estimation scheme and of the effects of symbol timing misalignment when OFDMA is used as an access scheme. Under OFDMA uplink channel environments, appropriate symbol length of CAZAC sequences as a preamble could be utilized in accordance with the number of transmitting antenna and channel condition. The effect of the number of CAZAC sequences for channel estimation is also presented in terms of mean square error (MSE). Taking into account the effect of multiple access interference (MAI) introduced by a symbol timing misalignment, the symbol error rate (BER) and throughput performance are investigated for a typical OFDMA uplink scenario.