The inverse problem of synthetic aperture interferometric radiometers (SAIRs) aims at retrieving the brightness temperature map from visibility function samples. To efficiently obtain an accurate solution, accelerated iterative regularization technique is proposed to reconstruct SAIR map. acceleration modifies conventional least square using a negative penalty term speed up initial iterations. ...

We investigate in this paper the optimal power allocation in an OFDM-SDMA system when some users have minimum downlink transmission rate requirements. We first solve the unconstrained power allocation problem for which we propose a fast zero-finding technique that is guaranteed to find an optimal solution, and an approximate solution that has lower complexity but is not guaranteed to converge. ...