Wireless LAN White Papers
Comparison of Coded OFDMA and OFDM-CDMA in a Frequency Reuse One System
Overview In this paper the downlink performance of convolutionally coded and single-user detected OFDMA, Multi-Carrier CDMA, Multi-Carrier Direct-Sequence CDMA, and Time-Frequency-Localized CDMA (two-dimensional spreading) is compared in a frequency reuse one system. It is shown that practically no difference exists between the schemes in their robustness against inter-cell-interference. For high system loads it is shown that OFDMA, due to its lower complexity and ability to maintain orthogonality on frequency-selective fading channels, outperforms the others. The results presented in this paper questions use of direct-sequence spreading for multiple-access in the downlink of cellular OFDM systems.
| Publisher | Chalmers University of Technology | File Format | |
|---|---|---|---|
| Date Published | January 2004 | Downloads | 7 |
| Format | White Papers | ||
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