Apparatus and method for controlling orientation
An orientation control apparatus and a method thereof are provided. The orientation control apparatus for controlling orientation of a phased array antenna includes the phased array antenna and an orientation controller. In the phased array antenna, a plurality of antenna elements are disposed on a plane. The phased array antenna receives a signal transmitted from at least one transmitter. The orientation controller controls orientation of the phased array antenna based on a channel estimated result of each sub array where the plurality of antenna elements have been grouped in the phased array antenna.
1. An apparatus for controlling a phased array antenna, the apparatus comprising:
the phased array antenna where a first sub array comprising a first plurality of antenna elements and a second sub array comprising a second plurality of antennas are disposed, configured to receive a signal through the first sub array and the second sub array; and
a controller configured to control a beam orientation of the phased array antenna based on a first channel value for the first sub array and a second channel value for the second sub array, which are estimated from the signal.
2. The apparatus of claim 1 , wherein the controller comprises:
a reference channel response generator configured to generate a reference channel response based on the first channel value and the second channel value;
a direction error estimator configured to estimate an error for the beam orientation with respect to a direction in which the signal is transmitted based on the first channel value, the second channel value and the generated reference channel response; and
an orientation setting unit configured to adjust the beam orientation of the phased array antenna based on the estimated error.
3. The apparatus of claim 2 , wherein the direction error estimator is configured to detect a phase error component of each of the first sub array and the second sub array based on a correlation between the first channel value and the second channel value, and the generated reference channel response, and estimate a phase error based on the detected phase error component of each of the first sub array and the second sub array; and
the orientation setting unit configured to adjust the beam orientation of the phased array antenna based on a direction error between the direction where the estimated phase error has been converted and an orientation setting direction at the phased array antenna.
4. The apparatus of claim 3 , wherein the direction error estimator is configured to estimate the phase error using a least square method.
5. The apparatus of claim 1 , further comprising a channel estimator configured to estimate the first channel value and the second channel value based on the signal by synthesizing a first outputs of the first plurality of antenna elements and a second outputs of the second plurality of antenna elements.
6. The apparatus of claim 1 , further comprising:
a signal converter configured to synthesize first outputs of the first plurality of antenna elements and second outputs of the second plurality of antenna elements, and convert each of the first outputs and the second outputs to baseband signals; and
a signal processor configured to decode data of the signal based on the baseband signals.
7. The apparatus of claim 6 , wherein the signal processor is configured to detect an error of the decoded data.
8. A method for controlling a phased array antenna, the method comprising:
receiving a signal through a first sub array and a second sub array, wherein the first sub array comprising a first plurality of antenna elements and the second sub array comprising a second plurality of antennas are disposed in the phased array antenna; and
controlling a beam orientation of the phased array antenna based on a first channel value for the first sub array and a second channel value for the second sub array which are estimated from the signal.
9. The method of claim 8 , wherein controlling of the beam orientation of the phased array antenna comprises:
generating a reference channel response based on the first channel value and the second channel value;
estimating an error for the beam orientation with respect to a direction in which the signal is transmitted based on the first channel value, the second channel value and the generated reference channel response; and
adjusting the beam orientation of the phased array antenna based on the estimated error.
10. The method of claim 9 , wherein estimating of the error for the beam orientation comprises:
detecting a phase error component of each of the first sub array and the second sub array based on a correlation between the first channel value and the second channel value, and the generated reference channel response, and
estimate a phase error based on the detected phase error component of each of the first sub array and the second sub array; and
adjusting the beam orientation of the phased array antenna based on a direction error between the direction where the estimated phase error has been converted and an orientation setting direction at the phased array antenna.
11. The method of claim 10 , wherein the phase error is estimated using a least square method.
12. The method of claim 8 , further comprising:
estimating the first channel value and the second channel value based on the signal by synthesizing a first outputs of the first plurality of antenna elements and a second outputs of the second plurality of antenna elements.
13. The method of claim 8 , further comprising:
synthesizing first outputs of the first plurality of antenna elements and second outputs of the second plurality of antenna elements, and convert each of the first outputs and the second outputs to baseband signals; and
decoding data of the signal based on the baseband signals.
14. The method of claim 13 , further comprising detecting an error of the decoded data.