Novel Detectors for Massive MIMO-GFDM Systems

The orthogonal frequency division multiplexing (OFDM) technology is employed in the fourth-generation mobile communication. It has two disadvantages. The first is high peak-to-average power ratio, and the second is high out-of-band radiated power. With the advent of the fifth generation of mobile communications, it needs large data transmission rate, short time delay and flexible waveforms. In the future communication applications, the diversified scenarios such as Internet of Things, inter-machine communication and telemedicine make the fourth-generation mobile communication no longer applicable. The generalized frequency division multiplexing has a pulse-shaping filter, which has less out-of-band radiated power and peak-to-average power ratio and fewer cyclic prefixes than OFDM. In order to meet high- data-transmission rate, it is an inevitable trend to install massive multi-input multi-output (massive MIMO) antennas. As the number of antennas increases, so does its complexity. This paper employs time reversal technology to reduce the computational complexity. Although the number of base station antennas has increased to eliminate interference, there is still residual interference. In order to eliminate the interference one step further, we deploy a zero forcing equalization (ZF equalization) after the time reversal combination.