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Although Pseudo-Orthogonal Carrier Interferometry (PO-CI) Multi-Carrier Code Division Multiple Access (MC-CDMA) could transmit doubled data streams, it highly depends on the modulation type. Through theoretical inter-code interference analysis, this paper puts forward that PO-CI/MC-CDMA systems could be de-spread ideally only with BPSK modulation. When complex modulation types are considered, PO-CI/MC-CDMA fails in de-spreading while simulation results of QPSK and QAM demonstrate this limitation. However, Pulse Amplitude Modulations (PAMs) are found to be more suitable for the systems.
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