MU-MIMO-GFDM Joint Receivers for Next-Generation Wireless Communications

Abstract

In order to meet the rigorous demands in B5G for Internet of Things (loT) and massive machine-type communications (MMTC), generalized frequency division multiplexing (GFDM) technology has received great attention. On the other hand, the index modulation (IM) can provide us with flexible settings of different parameters to achieve the ideal system goals. Therefore, in this paper, we consider the combination of spread spectrum (SS) and IM under the framework of GFDM, called spread spectrum index modulation generalized frequency division multiplexing. In this scheme, the information bits are jointly conveyed by the indices of spreading codes and the conventional M -ary modulated symbols, which not only increase the spectrum efficiency, but also improve the performance of bit error rate. At the receiver, a low-complexity maximum likelihood (ML) detector is proposed to effectively recover the transmitted signal. Finally, the space-time block code (STBC) is employed to construct the multi-input multi-output SS-GFDM-IM (MIMO SS-GFDM-IM) system to improve the reliability of the system. The simulation results show that the proposed scheme is superior to the existing systems.