Overview

Multiuser detection (MUD) for Multi-Carrier Code Division Multiple Access (MC-CDMA) has emerged as a crucial area of research in modern broadband wireless communication systems, addressing one of the most persistent challenges in CDMA-based technologies-multi-user interference (MUI). As wireless networks continue to expand in capacity, coverage, and user density, the need for advanced interference-mitigation techniques has become undeniable. MC-CDMA, which combines the frequency diversity of Orthogonal Frequency Division Multiplexing (OFDM) with the spread-spectrum advantages of CDMA, has proven significantly robust for high-data-rate applications. However, its performance remains heavily influenced by the presence of MUI and the imperfections within wireless channels. Hence, effective MUD strategies become central to achieving reliable and spectrally efficient communication.MC-CDMA spreads each user's symbol across multiple orthogonal subcarriers through a spreading sequence. This design inherently offers strong resilience against frequency-selective fading because even if certain subcarriers experience deep fading, the symbol energy can still be recovered from others.

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