Abstract
In the future, many objects will communicate with each other and with human beings, enabling a vast range of possible services and applications. However, this scenario comes with stringent network requirements. This paper studies and discusses recent technologies that were proposed to achieve the requirements of the Internet of Things (IoT) and massive machine type communications (mMTC). It focuses on their physical layer characteristics and identifies gaps that 5G networks need to address to achieve full connectivity in the IoT scenario. Hence, a detailed tutorial on the possible radio access technologies for 5G networks focusing on IoT use-cases is presented. The advanced 5G waveforms discussed are: 1) orthogonal frequency division multiplexing (OFDM); 2) universal filtered multicarrier (UFMC); 3) filter bank multicarrier (FBMC); and 4) generalized frequency division multiplexing (GFDM). The features that each radio access technology should present to address the main IoT's requirements are emphasized.
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