Filter Bank Multicarrier (FBMC) has become popular as an alternative to OFDM (Orthogonal Frequency Division Multiplexing). However, current FBMC systems found in the literature are not as compatible with MIMO (Multiple Input and Multiple Output) as OFDM is. This is due to the presence of inherent self-interference in current FBMC structures. Current literature uses maximal spectrally efficient waveforms, which have high interference among sub-carriers, thereby requiring complex post-processing in MIMO systems. In this work, we relax the spectral efficiency and show quantitatively that both the interference and out of band ripple energy can be decreased. We analyze this interference and its effects on different modulations at various SNR (Signal to Noise Ratio) values. We observe that the interference effect is more dominant at high SNR and affects higher order modulations more significantly. Reducing the interference enables near-orthogonal FBMC designs for practical SNR values and higher order modulations while still retaining MIMO receiver structures with low design complexity. We also show that error correcting codes can mitigate the effects of this interference. In this paper, first we compare our proposed FBMC system with OFDM and then with Filtered OFDM, one of the leading waveform candidates for 5G. Our simulations reveal that there is less than 1 dB gap between OFDM and FBMC having 84% and 97% spectral efficiencies respectively, using a 4 × 4 MIMO-VBLAST for 64-QAM at 30 dB SNR. Also, a comparison with Filtered OFDM system reveals that the proposed FBMC system is computationally more efficient for 5G systems.

滤波器组多载波（FBMC）作为OFDM（正交频分多路复用）的替代产品而变得流行。但是，文献中发现的当前FBMC系统不像OFDM那样与MIMO（多输入多输出）兼容。这是由于当前FBMC结构中存在固有的自干扰。当前文献使用最大频谱有效波形，其在子载波之间具有高干扰，从而需要MIMO系统中的复杂后处理。在这项工作中，我们放宽了频谱效率，并定量表明可以同时降低干扰和带外纹波能量。我们分析了这种干扰及其在各种SNR（信噪比）值下对不同调制的影响。我们观察到，在高SNR时，干扰效应更为明显，并且对高阶调制的影响更大。减少干扰可以实现接近正交的FBMC设计，以实现实际的SNR值和更高阶的调制，同时仍保持具有低设计复杂度的MIMO接收机结构。我们还表明，纠错码可以减轻这种干扰的影响。在本文中，我们首先将建议的FBMC系统与OFDM进行比较，然后与Filtered OFDM（用于5G的领先波形候选之一）进行比较。我们的仿真表明，使用4×4 MIMO-VBLAST在30 dB SNR下对64-QAM使用OFDM和FBMC分别具有84％和97％的频谱效率，间隙不足1 dB。还，