Patent ID: 8576942

Claim:
A transmitter for receiving an IQ signal, and outputting a transmission signal, the transmitter comprising: a decoder for transforming the IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (π/4), and which are included in eight vectors representing directions indicated by eight angels of (−π/2), 0, (π/2), π, (−3π/4), (−π/4), (π/4), and (3π/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (−π/2), 0, (π/2), π, (−3π/4), (−π/4), (π/4), and (3π/4), respectively, and outputting the eight phase signals; a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles of the two vectors, and outputting, as a plurality of amplification signals, the two phase signals having been amplified; and a combiner for combining the plurality of amplification signals with each other, and outputting a combined signal as the transmission signal, wherein the selector includes: a switch and PA (power amplifier) controller; a 2 phase selector; a plurality of switches; and a plurality of PAs that are uniquely connected to the plurality of switches, respectively, the 2 phase selector selects two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, based on the information upon the angles of the two vectors, and based on information upon magnitudes of the two vectors, the switch and PA controller controls each of the plurality of switches so as to select either an off state or one of the two phase signals selected by the 2 phase selector, and controls, when one of the plurality of switches is operated to select one of the two phase signals, a PA, among the plurality of PAs, connected to the one of the plurality of switches, so as to amplify the one of the two phase signals by using a predetermined amplification unit.