Performance Analysis of Complementary GFDM in IoT Communications

In fifth generation (5G) wireless network, it is well known that coverage enhancement is one of the most important aspects for massive machine type communication (mMTC) and Internet of things (IoT), etc. These application scenarios also introduce repeated transmission mechanism to enhance the coverage. Therefore, in this paper, we propose a new complementary generalized frequency division multiplexing (GFDM) repeated transmission scheme. We first analyze the interference model of conventional GFDM and then propose the conditions to eliminate inter-carrier interference (ICI) according to the interference model. Based on this condition, we have designed a pulse shaping filter corresponding to the conventional GFDM to combat ICI. Next, we analyzed the effect of this method on the signal-to-interference ratio (SIR). Simulation results show that this repeated transmission scheme has better BER performance than the conventional GFDM scheme.