Performance analysis and comparison of downlink MIMO MC-CDMA and MIMO OFDMA systems

Antonis Phasouliotis, Daniel K C So

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    In this paper, we analyze and compare the error rate performance of downlink coded multiple-input multiple-output multi-carrier code division multiple access (MIMO MC-CDMA) and coded MIMO orthogonal frequency division multiple access (MIMO OFDMA) systems under frequency selective fading channel conditions. In particular, the pairwise error probabilities (PEP) for both systems are derived. Simulation results illustrate that when the number of users, hence the system load is low, MIMO MC-CDMA outperforms MIMO OFDMA. However when the system load increases, the performance of MIMO MCCDMA deteriorates and becomes worse than MIMO OFDMA. This can be explained by the PEP analysis of MIMO MCCDMA which shows that when the number of users is small, the multiuser interference is also small and frequency diversity is better exploited. Conversely at high system load, MIMO OFDMA outperforms MIMO MC-CDMA as it is insensitive to multiuser interference. Nevertheless if the other users' spreading sequences are available at the receiver of the desired user, the impact of multiuser interference can be minimised and MIMO MC-CDMA outperforms MIMO OFDMA at all system loads.© 2009 Crown.
    Original languageEnglish
    Title of host publicationIEEE Vehicular Technology Conference|IEEE Veh Technol Conf
    Publication statusPublished - 2009
    EventVTC Spring 2009 - IEEE 69th Vehicular Technology Conference - Barcelona
    Duration: 1 Jul 2009 → …


    ConferenceVTC Spring 2009 - IEEE 69th Vehicular Technology Conference
    Period1/07/09 → …


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