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US 7,680,196 B2Granted
Array antenna transceiver and calibrating method of transmission route used for the same
AssigneeNEC Corporation
InventorTomohiro Azuma
Life of this patent
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Abstract
The present invention provides a calibrating method of an array antenna transceiver for performing multicarrier transmission capable of minimizing the increase of a transceiver size and a signal processing load and keeping a certain calibration accuracy. A method of calibrating a transmission route using an array antenna transceiver for performing broadband transmission by a multicarrier includes grouping all subcarriers into a plurality of subcarrier groups and calibrating a transmission route for each group.
Claims21
An array antenna transceiver for performing broadband transmission by a multicarrier, comprising:
- means for grouping all subcarriers into a plurality of subcarrier groups;
- and
- means for calibrating a transmission route for each group,
- wherein said means for calibrating a transmission route includes:
- a plurality of calibration signal demodulating means for demodulating a transmission route number and subcarrier number for calibration of a transmission route and outputting the demodulation results,
- demodulation result processing means for outputting a transmission route number, subcarrier number, and normalized demodulation symbol point (phase/amplitude information) by receiving demodulation results of calibration signals output from the calibration signal demodulating means and outputting calculated calibration coefficients by receiving demodulation results of calibration signals output from said calibration signal demodulating means,
- demodulation symbol area determining means for determining an area to which each demodulation result belongs on a previously divided I/Q coordinate plane by receiving a transmission route number, subcarrier number, and normalized demodulation symbol point (phase/amplitude information) output from said demodulation result processing means and outputting the determination result,
- calibration subcarrier selecting means for selecting one transmission route number and subcarrier number closest to the medium value in a area out of demodulation symbol point (phase/amplitude information) group classified every area output from said demodulation symbol area determining means and outputting the determination results,
- calibration control means for outputting a transmission route number and subcarrier number selected every area output from said calibration subcarrier selecting means and outputting a calibration mode change signal for changing calibration modes, and
- transmission baseband processing means for setting calibration coefficients of all subcarriers in all transmission routes by receiving calibration coefficients output from said demodulation result processing means and a transmission route number and subcarrier number classified into the same area output from calibration coefficients and generating a calibration signal in accordance with a calibration mode change signal supplied from said calibration control means, a transmission route to be calibrated, and subcarrier information.
7 more elements
A method of calibrating a transmission route using an array antenna transceiver for performing wide-band transmission by a multicarrier, comprising:
- a step of grouping all subcarriers into a plurality of subcarrier groups and calibrating a transmission route for each group,
- wherein said step of calibrating a transmission route includes:
- a calibration signal demodulating step of demodulating a transmission route number and subcarrier number for calibration of a transmission route and outputting the demodulation result;
- demodulation result processing step of outputting a transmission route number, subcarrier number, and normalized demodulation symbol point (phase/amplitude information) by receiving a demodulation result of a calibration signal output from said calibration signal demodulation step and outputting a calculated calibration coefficient by receiving a demodulation result of a calibration signal output from said calibration signal demodulating step,
- a demodulation symbol area determining step of determining an area to which each demodulation result belongs on a previously divided I/Q coordinate plane and outputting the determination result by receiving a transmission route number, subcarrier number, and normalized demodulation symbol point (phase/amplitude information) from the demodulation result processing step,
- a calibration subcarrier selecting step of selecting one transmission route number and subcarrier number closest to the medium value in an area output from the demodulation symbol area determining step out of demodulation symbol point (phase/amplitude information) groups classified every area output from said demodulation symbol area determining step and outputting the selection results,
- a calibration control step of outputting a transmission route number and subcarrier number selected every area output from said calibration subcarrier selecting step and changing calibration modes, and
- a transmission baseband processing step of setting calibration coefficients of all subcarriers in all transmission routes and moreover generating a calibration signal in accordance with a calibration mode change signal supplied from said calibration control step, a transmission route to be calibrated, and subcarrier information by receiving a calibration coefficient output from the demodulation result processing step and a transmission route number and subcarrier number classified into the same area output from said demodulation symbol area determining means.
5 more elements
Dependencies are inferred from the claim text.