applications where the resulting transmit power distributions are subject to model inaccuracies. More specifically, the design problem formulated in this paper and the proposed robust scheme can be exploited to robustify the spatial power distribution for applications that an array equipped with multiple elements is used to emit waveforms in order to deliver power to an area of interest in a controlled manner.

The core of this study is built upon exploiting waveform diversity which has been introduced in multiple-input multiple-output (MIMO) radar literature [@Stoica2007a], and later has been applied for local hyperthermia cancer treatment improvement in [@08:Guo]. In the MIMO radar field, robustness studies have been carried out in different applications under varying design parameter uncertainties, cf., [@07:Yang; @11:Grossi]. Recently, in [@14:Shariati2014c], we have studied the robustification of the waveform diversity methodology for MIMO radar applications. It should be highlighted that in this paper a more generic problem formulation has been studied with respect to those of [@14:Shariati2014c], where a new application area is considered to illustrate the performance of our proposed robust design. In the array processing literature, beamforming under array model errors has also spawned extensive work, cf., [@04:Li; @08:Yan; @08:Kim; @12:Khabbazibasmenj].

For hyperthermia therapy, the need 