Improving Latency and Reliability in 5G Internet-of-Things Networks

The transmission from the IoT terminals to a cellular base station (BS) about the state of critical infrastructure such as Smart Grid requires high reliability and low latency. The combination of massive multiple-input-multiple-output (M-MIMO) and spatial modulation (SM) systems, referred to as massive SM-MIMO systems, has been proposed in 5G cellular networks to support these transmissions. Building a practical massive SM-MIMO system is very challenging due to the complexity and latency of BS detection schemes, often ignored in theoretical studies. In this paper we develop low-complexity low-latency massive SM-MIMO detection schemes that are validated in real wireless environment by using software defined radio (SDR) platforms. Our experiments indicate significant out-performances in term of latency and signal-interference-plus-noise ratio with respect to other schemes in the literature.