Fig. 4From: Secure massive MIMO system with two-way relay cooperative transmission in 6G networksSecrecy sum-rate in different \(p_{u}\) with \(p_{BS} = 35\,{\text{dBm}}\), \(p_{\max } = 30\,{\text{dBm}}\), and \(K = 1\). Blue line: QCRO; yellow line: PSO; green line: CRO; pink line: RMRS; black line: SRSBack to article page