Millimeter-Wave MIMO Transmission for FBMC Systems With Lens Antenna Arrays

Millimeterwave (mmWave) techniques will be a key enabler for wireless communications to achieve high data rates. Additionally, Filter Bank Multi-Carrier (FBMC) with good spectral properties has also been regarded as an important transmission technique for future wireless communications. In this letter, we design and analyze an FBMC-based mmWave Multiple-input Multiple-output (MIMO) system. Specifically, we first pre-code quadrature amplitude modulation symbols in time to ensure that the MIMO technique becomes simple in FBMC. Secondly, we determine the optimal subcarrier spacing by maximizing the signal-to-interference ratio. Finally, using a lens antenna array combined with a simple channel estimator, we transmit data to the receiver. Simulation results show that FBMC can effectively support multi-antenna and mmWave techniques, providing favorable efficiency and reliability. Furthermore, we also verify that Alamouti's space time block code can provide considerable diversity gain.