A wireless networks flexible adoptive modulation and coding technique in advanced 4G LTE

Abstract

As the need for mobile services continues to explode, mobile wireless networks must expand greatly their capacities. The capacity of 4G cellular wireless networks like LTE-A (Long Term Evolution Advanced ) can be increased by larger bandwidth, higher number of antennas for more spatial multiplexing, reuse of radio cells and in general optimisation of the network configuration. Methods of capacity expansion divide into three general categories: the deployment of more radio spectrum, more intensive geographic reuse of spectrum and increasing the throughput capacity of each MHz of spectrum within a given geographic area. The paper describes these several basic methods to intensify mobile wireless capacity. The potentially higher capacity will be achieved only if the whole wireless network can be more flexible to the existing real environment at any time. Appropriate linear or nonlinear flexible AMC (adaptive modulation and coding) techniques which are able to identify these changes are described for wideband linear power amplifier, multiple input multiple output antenna systems, heterogeneous networks and self-organising networks including the corresponding realisation and performance aspects.