Energy-Efficient spatial modulation in wireless sensor networks

Spatial modulation (SM) is a promising technique for 5G systems as it guarantees good data rate at reduced complexity. Increased data rate and increased energy efficiency is possible with spatial modulation due to the fact that information is transmitted in the indices of the transmit antenna and also on the constellation symbol. Cooperative Multiple-Input-Multiple-Output (MIMO) technique based on spatial modulation is proposed to reduce the interchannel interference and synchronization problems among transmit nodes and achieve high multiplexing gain in Wireless Sensor Networks (WSNs). A cooperative MIMO framework is formed by considering spatially distributed nodes each with a single antenna employing spatial modulation for improving the energy efficiency of WSN. In the proposed technique the theoretical Pairwise error probability (PEP) is derived from the minimum Euclidean distance between the transmitted symbols. The Bit error rate (BER) performance and energy consumption per bit of the proposed technique is presented and compared with the performance of Spatial Modulation (SM)technique.