increasing spectral efficiency of gfdm with adaptive modulation and coding for next generation cellular networks

As a result of resource constraints in each generation of wireless systems, new technologies should be used in order to obtain maximum system efficiency. the combination of adaptive modulation and coding (amc) with generalized frequency division multiplexing (gfdm) is a promising technique which efficiently optimizes the data rate, increases the capacity and reduces bit error rate (ber) of the systems, which are primary goals of each generation of wireless networks. in paper, we primarily analyze multicarrier gfdm performance based on adaptive modulation using a discrete rate, then examine a variable power transmission scheme and finally find the form of rate and power which maximizes the spectral efficiency. the results show that significant improvement in terms of spectral efficiency and ber can be achieved demonstrating the superiority of the proposed amc scheme in comparison with nonadaptive transmission schemes. therefore, the presented system can be used in next generation cellular networks with higher capacity.