Optimum performance of link adaptation in HIPERLAN/2 networks

In this paper link adaptation is investigated in the HIPERLAN/2 context. It is shown that updating the modulation and coding on a frame basis can bring a gain theoretically greater than 2.5 dB over the optimum long term approach. The influence of the small-scale fading properties in the various propagation environments and of the transmit and receive filters selectivity is studied. The throughput performance is computed both analytically and by network simulations, assuming constant interference and constant transmit power as well as perfect knowledge of the SNIR or PER. Finally, the throughput loss resulting from PER estimation errors is illustrated by simulations and a sub-optimum method better suited to implementation is presented.