This paper investigates the application of MIMO to the FBMC/OQAM scheme in highly frequency selective channels. The system model that is considered in this work does not make any assumption about the flatness of the channel. In this scenario, it is definitely challenging the design of MIMO precoding and decoding matrices that succeed in removing the interference. In this regard, we have derived the degrees of freedom, in terms of number of streams (S), transmit (NT ) and receive (NR) antennas, required to eliminate the unwanted signals. The analysis reveals that in some multi-antenna configurations some residual interference should be expected. In this case, we have further studied existing low-complexity solutions that solve optimization problems that depend on the MSE. Numerical results show that the sum-rate in FBMC/OQAM is on pair with OFDM when NR - 1 = NT = S = 2. This result is relevant because the adoption of FBMC/OQAM brings substantial improvements with respect to OFDM in a variety of contexts.
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机译：本文研究了MIMO在高频选择性信道中FBMC / OQAM方案中的应用。在这项工作中考虑的系统模型不对通道的平坦度做出任何假设。在这种情况下，无疑要挑战成功消除干扰的MIMO预编码和解码矩阵的设计。在这方面，我们已经根据消除不必要信号的流（S），发射（NT）和接收（NR）天线的数量得出了自由度。分析表明，在某些多天线配置中，应预期会有一些残余干扰。在这种情况下，我们将进一步研究现有的低复杂度解决方案，以解决依赖于MSE的优化问题。数值结果表明，当NR-1 = NT = S = 2时，FBMC / OQAM的总速率与OFDM成对。这一结果是有意义的，因为FBMC / OQAM的采用在许多方面都对OFDM带来了实质性的改进。上下文。
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