3 May 2007 Decoder-aided multidata detection of COFDM-CDMA waveforms on HF multipath/fading channels
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Orthogonal Frequency Division Multiplexing (OFDM) is a widely used technique for data transmission on multipath fading channels. The multipath component of these types of channels causes a phenomenon known as frequency selective fading. This type of fading can severely degrade or completely eliminate the signal energy of many of the OFDM tones producing an irreducible error rate, even when no noise is present. In the early 1990's, researchers combined some of the characteristics of Code Division Multiple Access (CDMA) and Spread Spectrum (SS) with OFDM in order to create a more robust modulation scheme capable of surviving frequency selective fading without the need for forward error correction (FEC) techniques and thus OFDM-CDMA was born. Similar to OFDM, FEC coding can be added to OFDM-CDMA waveforms to further improve performance (referred to as COFDM-CDMA). An additional performance improvement possible for COFDM-CDMA is to exploit the output of the FEC decoder in an iterative fashion. This paper will investigate the possible performance benefits of feeding back the decoded FEC data bits to the mutiuser (i.e. multidata) detection (MUD) scheme of COFDM-CDMA waveforms on various HF multipath/fading channels.
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John Nieto, John Nieto, } "Decoder-aided multidata detection of COFDM-CDMA waveforms on HF multipath/fading channels", Proc. SPIE 6577, Wireless Sensing and Processing II, 65770C (3 May 2007); doi: 10.1117/12.720224; https://doi.org/10.1117/12.720224

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