Fig. 2From: Performance analysis and power allocation strategy in single-antenna cognitive overlay systemsComparison of approximated and true BER curves \(\left ({\sigma }_{T_{A},T_{B}}^{2}/\sigma _{n,T_{B}}^{2} = 5, \sigma _{T_{A},R_{A}}^{2}/ {\sigma }_{n,R_{A}}^{2} = 0, \sigma _{T_{B},R_{A}}^{2}/\sigma _{n,R_{A}}^{2} = \sigma _{T_{B},R_{B}}^{2}/\sigma _{n,R_{B}}^{2} = 10\, \text {dB}, P_{A} = P_{B} = 1\right)\) Back to article page