Authors 1 & 2 contributed equally. We thank the management of Thiagarajar College of Engineering, Madurai for their constant support.

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SummarySpatial modulation is a potential candidate for 5G wireless communication systems that provides high spectral efficiency with high reliability and low complexity. Spatial modulation conveys information in the index of transmitting antenna along with conventional modulation scheme. Also, energy efficiency communication plays a vital role in 5G wireless communication. In this article, energy efficiency and spectral efficiency are focused on a bidirectional relay network. In the proposed bidirectional relay network, the energy consumption burden at the relay node is reduced by placing a power splitter that coordinates the energy harvesting and information processing at the relay node. Spatial modulation is employed at all nodes to reduce the effect of interchannel interference and synchronization problem in the receiver. The combined effect of spatial modulation in all nodes and energy harvest at the relay node are analyzed in the bidirectional relay network. The end‐to‐end outage probability expression for the bidirectional relay network is derived in terms of power splitting factor at relay node. Analytical simulation results have been verified by Monte‐Carlo simulations. The overall performance of the proposed system is compared with an existing literature and found that the proposed system is having better spectral efficiency and energy harvesting.

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.