Power balancing in FBMC-MISO systems

This paper addresses the fairness in power allocation optimization for FBMC-MISO systems. Given a power budget we have proposed a sub-optimal strategy to distribute the power among the subcarriers. Firstly, with the aim of mitigating the interference terms as much as possible two precoding techniques have been proposed: WMF and Tx-MDIR. As a benchmark we have considered a transmit filter that is designed according to the ZF criterion. Then, assuming that the noise power dominates over the interferences we have allocated the power according to the solution provided by the max-min SINR problem which balances the SINRs. When the channel can be assumed flat in the subcarrier pass band region both ZF and Tx-MDIR can take advantage of the power control to achieve a BER equal to 10^-4 by saving 3dB in the transmitted power with respect to the uniform power allocation strategy. Simulation-based results have shown that for very frequency selective channels the BER plot of ZF exhibits an error floor. In this scenario, Tx-MDIR and WMF are able to boost the BER in the Eb/N0 range [15dB-30dB] and [24dB-30dB], respectively.