Various approaches related to systems and methods for LDPC based data processing. The ith switch connects the other input terminal to the output terminal, and the ith switch also connects the one input terminal to the output terminal. The femtocell base station sets the respective transmit power of the cell-center and the cell-edge in a range that will not exceed the maximum transmit power, adjusts the transmit power control parameter to allow control by the terminal at the power value that was set, and notifies the terminal. Comparing the a priori known amplitude and phase of the reference signal with the amplitude and phase of the received reference signal allows determination of the distortions introduced at the respective receiver gain which are subsequently corrected.