Patent ID: 8532685

Claim:
A mobile communication system including mobile terminals and a base station performing radio communication with the mobile terminals, wherein the base station includes: first and second antenna elements that have polarization characteristics orthogonal to each other; a first baseband signal converter that converts a received signal received by the first antenna element into a baseband signal; a first multiplier that weights the baseband signal converted by the first baseband signal converter by multiplying a first weight coefficient; a second baseband signal converter that converts a received signal received by the second antenna element into a baseband signal; a second multiplier that weights the baseband signal converted by the second baseband signal converter by multiplying a second weight coefficient; an adder that adds up the baseband signals weighted by the first and second multipliers and outputs the sum; and, a signal processor that calculates the first and second coefficients to be used by the first and second multipliers by MMSE (Minimum Mean Square Error), such that the first and second weight coefficients make the combined polarization of the received signals received at the first and second antenna elements orthogonal to the polarization of an interference signal wherein the interference signal can be removed even if the interference signal exists in the same direction as a desired signal.