Wireless communication apparatus and method

1. A wireless communication apparatus comprising:

a plurality of antenna devices;

signal generating circuitry which, in operation, generates an IQ signal having an I signal and a Q signal;

a plurality of phase shifting circuitry, provided for each of the plurality of antenna devices, which, in operation, generates a plurality of combination signals by combining the I signal and the Q signal based on a combining scheme that includes rotate calculations for the IQ signal in a complex plane,

wherein the rotate calculations generate a new I signal of the combination signal by adding the I signal multiplied with a first control value and the Q signal multiplied with a second control value, and generate a new Q signal of the combination signal by adding the I signal multiplied with a third control value and the Q signal multiplied with a fourth control value;

phase controlling circuitry which, in operation, controls the combining scheme in each of the plurality of phase shifting circuitry by individually suppling the first through fourth control values to the phase shifting circuitry,

wherein the phase controlling circuitry includes:

a reference table that contains the first through fourth control values to be supplied to the phase shifting circuitry, the first through fourth values being provided for each pattern of directivity of the plurality of antenna devices,

phase setting circuitry which, in operation, sets a value of the phase for each of the plurality of antenna devices in accordance with a determined pattern of directivity, and

control value obtaining circuitry which, in operation, obtains the first through fourth control values corresponding to the set value of the phase by referring to the reference table and supplies the obtained first through fourth control values to the plurality of phase shifting circuitry; and

quadrature error correcting circuitry which, in operation, corrects at least one of amplitude combining scheme and phase combining scheme of the combining scheme in correcting the combining scheme,

wherein the quadrature error correcting circuitry includes phase error correcting circuitry which, in operation, modifies the obtained third and fourth control values, the modified third and fourth control values being supplied to each of the plurality of phase shifting circuitry.

2. The wireless communication apparatus according to claim 1 , wherein

the quadrature error correcting circuitry includes

amplitude error correcting circuitry which, in operation, modifies the obtained first and second control values, the modified first and second control values being supplied to each of the phase shifting circuitry.

3. The wireless communication apparatus according to claim 1 , wherein

the quadrature error correcting circuitry includes

amplitude error correcting circuitry, provided for each of the plurality of antenna devices, which, in operation corrects the amplitude of at least one of the I signal and the Q signal of the combination signal output from each of the phase shifting circuitry.

4. A wireless communication method using a plurality of antenna devices, comprising:

generating an IQ signal having an I signal and a Q signal;

generating a plurality of combination signals by combining the I signal and the Q signal based on combining scheme that includes rotate calculations for the IQ signal in a complex plane, by using a plurality of phase shifting circuitry,

wherein the rotate calculations generate a new I signal of the combination signal by adding the I signal multiplied with a first control value and the Q signal multiplied with a second control value, and generate a new Q signal of the combination signal by adding the I signal multiplied with a third control value and the Q signal multiplied with a fourth control value;

controlling the combining scheme in each of the plurality of phase shifting circuitry by using a reference table that contains the first through fourth control values to be supplied to the phase shifting circuitry, the first through fourth values being provided for each pattern of directivity of the plurality of antenna devices,

wherein the controlling includes:

setting a value of the phase for each of the plurality of antenna devices in accordance with a determined pattern of directivity, and

obtaining the first through fourth control values corresponding to the set value of the phase by referring to the reference table and suppling the obtained first through fourth control values to the plurality of phase shifting circuitry; and

correcting at least one of amplitude combining scheme and phase combining scheme of the combining scheme in correcting the combining scheme in a quadrature error correction,

wherein the quadrature error correction includes modifying the obtained third and fourth control values in the phase combining scheme, the modified third and fourth control values being supplied to each of the plurality of phase shifting circuitry.

5. The wireless communication method according to claim 4 , wherein the quadrature error correction includes modifying the obtained first and second control values in the amplitude combining scheme, the modified first and second control values being supplied to each of the phase shifting circuitry.

6. The wireless communication method according to claim 4 , wherein the quadrature error correction includes correcting the amplitude of at least one of the I signal and the Q signal of the combination signal output from each of the phase shifting circuitry in the amplitude combining scheme, for the plurality of antenna devices.