FPGA implementation of the MIMO-OFDM physical layer using single FFT multiplexing

In this paper, we present a prototype FPGA design for an efficient physical layer implementation of a MIMO-OFDM technique. We implement multi-channel MIMO-OFDM systems using single Fast Fourier Transform block that is shared across modulations for the system. Our experimental results show that the proposed implementation saves at least 60 percent of the hardware resources, while achieving the same data rate as known baseline MIMO-OFDM implementations. We also show that as more channels are used, more resources can be saved by using our proposed architecture.