Performance Analysis of Spatial Modulation in Cooperative Cognitive Radio Networks with Energy Harvesting

Abstract Inspired by the stringent requirements of energy efficiency and spectral efficiency for future wireless communication networks, a novel Spatial Modulation Assisted Cooperative Cognitive Radio Network with Energy Harvesting (SM-CCRN-EH) is proposed in this paper. It is well known that Cognitive Radio (CR) is a promising solution to mitigate the effect of spectrum scarcity using unlicensed bands in spectrum. In the proposed CR network, SM is applied at both Primary Transmitters (PT) and Secondary Transmitter (ST) to improve spectral efficiency. The ST acts as a Decode and Forward (DF) energy harvested relay node. It uses multiple antennas for receiving signal from PT and single antenna for signal transmission. Energy harvesting at the ST is possible using time switching or power splitting protocol to improve the energy efficiency of the system. In order to quantify the reliability of the proposed system, closed form expressions are derived for outage probability and Bit Error Rate (BER) at the Primary Receiver (PR) and Secondary Receiver in both time slots. Computer simulations are performed to verify the accuracy of derived analytical expressions. It is observed that there is an excellent agreement for both analytical results and computer simulations.