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Future wireless networks beyond 6G demand ultra-reliable and low-latency communication. Filter Bank Multicarrier (FBMC) offers superior spectral efficiency and resilience to carrier frequency offsets, positioning it as a promising candidate. However, FBMC's susceptibility to a higher Bit Error Rate (BER) poses a significant challenge. This research addresses this limitation by introducing an integrated approach. Specifically, this research optimizes constellation size at the transmitter, combined with the strategic use of multiple antennas and Offset Quadrature Amplitude Modulation (OQAM) to mitigate interference and substantially reduce BER. This proposed methodology aims to enhance the reliability of FBMC, thereby advancing its viability for next-generation wireless systems