ZCZ-CDMA and OFDMA using M-QAM for broadband wireless communications: Research Articles

  • Authors:

  • Jianfeng Weng;Tho Le-Ngoc;Yinglin Xu

  • Affiliations:

  • Department of Electrical and Computer Engineering, McGill University, Montréal, Québec, H3A 2A7, Canada;Department of Electrical and Computer Engineering, McGill University, Montréal, Québec, H3A 2A7, Canada;Department of Electrical and Computer Engineering, McGill University, Montréal, Québec, H3A 2A7, Canada

  • Venue:
  • Wireless Communications & Mobile Computing
  • Year:
  • 2004

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Abstract

This paper considers direct-sequence code-division multiple-access with zero-correlation zone sequences (ZCZ-CDMA) and orthogonal frequency-division multiple-access (OFDMA) schemes using M-ary QAM signaling for broadband wireless communications. Their system structures, complexities and performances in both AWGN and multipath frequency-selective fading channels are evaluated and compared. For ZCZ-CDMA, joint suppression of the multipath fading interference and multiple-access interference can be achieved with a reduced family-size of the spreading sequences. For OFDMA, analytical and simulation results indicate that it has the same performance as ZCZ-CDMA in fast time-varying multipath fading channels. In time-invariant or slowly time-varying channels, where the channel information can be made available to transmitters, OFDMA outperforms ZCZ-CDMA, offers a higher capacity and is more flexible for system reconfiguration with a comparable computational complexity. Copyright © 2004 John Wiley & Sons, Ltd.