Multi-IRS aided communication for improved performance in massive IoT network

A massive IoT network involve multitude of intelligent connected devices. The main challenge of this massive machine type communication (mMTC) is to provide uniform and reliable communication support to all the network nodes. The poor signal strength at the nodes in the shadowing area often results in data loss. This paper presents a multi-RIS aided IoT communication network that offers uniform coverage to all the IoT nodes in the network. The multiple RISs through efficient reflection control enables improved system performance. The IoT network is evaluated for performance in terms of achieved sum rate. The detailed numerical analysis is carried out to provide the mathematical formulations. Further, the performance comparison with three other system models, namely Centralized IRS system, Random IRS system and System without IRS is carried out. It is observed that the distributed IRS system improves the achieved sum rate by 9.61% with N=100 per IRS and b=∞ as compared to centralized IRS system. In the end, the transmit power required to achieve different target rates is evaluated under different IRS system.