Patent ID: 8781412
Filing Date: 2014-07-15
Classification: H04B,H04L,H04W

Abstract:
1. A radio transmission system comprising: a plurality of antenna pairs, each antenna pair including a transmitting antenna and a receiving antenna corresponding to each other and configured such that a radio signal transmitted from the transmitting antenna in one of the plurality of antenna pairs directly arrives as a desired wave at the receiving antenna of the one antenna pair, and a radio signal transmitted from the transmitting antenna of another antenna pair different from the one antenna pair directly arrives as an unnecessary wave at the receiving antenna of the one antenna pair; a transfer characteristic correction circuit provided for each of the antenna pairs, each transfer characteristic correction circuit configured to correct a transmission-target signal corresponding to the transmitting antenna of the corresponding antenna pair based on a transfer characteristic of a transmission space between the transmitting antenna and the receiving antenna of the corresponding antenna pair; and a modulation functional circuit provided for each of the antenna pairs, each modulation functional circuit configured to modulate a carrier signal with a corrected signal after correction by the transfer characteristic correction circuit and transmit the modulated carrier signal from the transmitting antenna of the corresponding antenna pair, wherein for each of a plurality of transmission-target signals, the transfer characteristic correction circuit is configured to perform only a real term-related correction operation for a desired signal and only an imaginary term-related correction operation for an unnecessary signal, and supply a real term-related corrected signal for the desired signal and an imaginary term-related corrected signal for the unnecessary signal in a pair to the modulation functional circuit, and for each of the plurality of transmission-target signals, the modulation functional circuit quadrature-modulates for the real term-related corrected signal, for the desired signal and the imaginary term-related corrected signal, and for the unnecessary signal supplied in a pair from the transfer characteristic correction circuit.