Characterization of SNDR degradation in nonlinear wireless transmitters

Abstract

This article presents a measurement strategy and a characterization bench for the evaluation of Signal to Noise and Distortion Ratio (SNDR) in nonlinear wireless systems when in presence of memory effects. This measurement proposal will be combined with a closed analysis of the nonlinear mechanisms appearing in communication systems presenting memory. The analysis of this memory mechanism, when the system is excited by complex modulated signals with different statistics, will be a useful tool for design engineers to evaluate the degradation of SNDR in nonlinear wireless systems. Finally, the proposed measurement approach will be applied to a CDMA communication system, by evaluating carefully the SNDR of that system.

Spectral efficiency analysis for massive MIMO orthogonal frequency division multiplexing and filter bank multicarrier in a realistic scenario using signal‐to‐noise‐and‐distortion ratio and interpolation for different modulation coding schemes

“…The nonlinear behavior is the main cause of SNDR degradation in wireless transmitters. This behavior can be seen as adjacent or as co‐channel distortion 31 . In such MM systems, where a high number of antennas could theoretically lead to an infinite SNR, the scenario can be more distortion limited than noise limited.…”