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Orthogonal frequency division multiplexing-code division multiple access (OFDM-CDMA) is a technique that has been used to improve the robustness of OFDM. For uncoded waveforms, OFDM-CDMA has been shown to offer some significant performance advantages over OFDM on multipath/fading channels (Nieto, 2004). A recent paper (Nieto, 2005) reported that this performance advantage was greatly reduced for coded and interleaved waveforms. However, the results presented were only for 2-ary phase shift keying (2-PSK) modulation. This paper extends this research by investigating the performance of coded OFDM and coded OFDM-CDMA waveforms utilizing higher-order modulation schemes on various HF multipath/fading channels.
Circuit Theory and Design, 2005. Proceedings of the 2005 European Conference on (Volume:3 )
Date of Conference: 28 Aug.-2 Sept. 2005