A Survey of Cooperative Jamming-Based Secure Transmission for Energy-Limited Systems

Table 1

An overview of power allocation-based cooperative jamming schemes.

References	Assumptions	Metrics	Contributions
[33]	Perfect CSI	SC	Propose a fast algorithm to obtain asymptotically optimal cooperative jamming.
[34]	Perfect CSI	SC	Improve the SC for a scenario with limited power and a fixed number of antennas.
[35]	Perfect CSI	SC	Prove that the optimal power allocation depends on the global CSI and optimize SC subject to power constraints.
[36]	Perfect CSI	SC	Study the secrecy performance of partial cooperative jamming for single and multiple data transmission scenarios.
[37]	Perfect CSI	SC	Analyze the impact of the distance and the number of eavesdroppers on the secrecy performance for different transmission patterns.
[38]	Unknown CSI	SC	Propose a robust scheme in an unknown CSI scenario and demonstrate the similar secrecy performance between unknown and known CSI.
[39]	Statistical CSI	SOP	Minimize the SOP problem to obtain the optimal power allocation.
[40]	Statistical CSI	SOP	Derive closed-form and asymptotic expressions of the SOP for a dual-hop underlay uplink CRN operating under Nakagami- fading channels.
[24]	Statistical CSI	IP	Propose a case study of physical layer security for a multiple relay scenario and evaluate the IP in Rayleigh fading environments.
[41]	Perfect CSI	SEE	Propose a beamforming scheme to maximize the SEE-based optimization problem in an underlay CRN cooperative jamming scenario.
[25]	Perfect CSI	SEE	Consider a joint source and relay power allocation scheme to maximize the system SEE.
[26]	Perfect CSI	SG	Demonstrate that a slightly reduced SC sharply decreases the received SNR of an eavesdropper.
[42]	Unknown CSI	WCSR	Optimize the flying trajectories and transmit power of unmanned aerial vehicles to improve the average WCSR of the system.