Accuracy evaluation of the theoretical approximation of the mean mutual information per coded bit in coordinated multi point transmissions

Abstract

The increased demand of spectrally efficient wireless transmissions requires accurate performance prediction mechanisms. A promising prediction method for OFDM transmission using convolutional turbo codes is based on the mean mutual information per coded bits. This paper aims to study the accuracy provided by the theoretical method used to compute the mean mutual information per coded bit presented in literature by comparison to the results obtained from measurements. The results obtained showed that for point-to-point transmissions over both Gaussian and frequency-selective channels, the theoretical method provides good accuracies while for coordinated multipoint transmissions over frequency-selective channels, the analytical method loses its accuracy as the distributions of the combined LLRs can no longer be considered combinations of Gaussian distributions.