Performance of SCMA with GFDM and FBMC in Uplink IoT Communications

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Performance of SCMA with GFDM and FBMC in Uplink IoT Communications

Li, Fei / Zheng, Kan / Long, Hang / Guan, Dong

Fifth generation wireless networks are expected to support a variety of new application scenarios, such as internet-of-things (IoT) and machine-type communications (MTC), etc. These scenarios have a large number of terminal accesses and occupy a lot of spectrum resources. The existing orthogonal frequency division multiple access (OFDMA) technology cannot support massive connectivity, the severe out-of-band (OOB) power leakage not only waste spectrum resources but also hinders the application of OFDM in the fragmented spectrum. Therefore, in this paper, we combine non-orthogonal multiple access (i.e., SCMA) with new multi-carriers (i.e., GFDM and FBMC) to address the problem of massive connections and spectrum resource shortages in the IoT. Meanwhile, in order to further reduce the interference to the primary system in the fragmented spectrum, an active interference cancellation (AIC)-based OOB power leakage suppression scheme is designed for GFDM. Simulation results show that SCMA-GFDM and SCMA-FBMC/QAM have much better BER performance than SCMA-OFDM in asynchronous uplink communications, and AIC technique can obviously suppress the OOB power leakage of GFDM.