SNDR
Signal-to-noise and distortion ratio (SNDR) is a term used for a set of measures of the quality of a signal from a communications device. These include SINAD and SINADR. == SINAD == The signal-to-noise and distortion ratio (SINAD) is a measure of the quality of a signal from a communications device, often defined as S I N A D = 10 log 10 P signal + P noise + P distortion P noise + P distortion , {\displaystyle \mathrm {SINAD} =10\log _{10}{\frac {P_{\text{signal}}+P_{\text{noise}}+P_{\text{distortion}}}{P_{\text{noise}}+P_{\text{distortion}}}},} where P {\displaystyle P} is the average power of the signal, noise and distortion components.