This paper proposes a simple adaptive modulation scheme over nonlinear time-varying channels equipped with High Power Amplifiers (HPAs). The paper includes the probability of Bit Error Rate (BER) analysis of M-QAM transmission over nonlinear channels, which is the key factor in designing adaptive modulation. The paper includes performance comparison of adaptive modulation over linear and nonlinear channel with different normalised Doppler frequencies. The analysis is supported with simulation results. Results show that the nonlinearity affects the overall system performance; and the adaptive modulation scheme allows significant spectral improvement over the classical non-adaptive system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.