CALIBRATION OF SMART ANTENNA SYSTEMS
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Abstract
The present invention relates to a method, system, apparatus, and computer pro-gram product for transmitting or receiving a plurality of time-duplexed transmission signal components via respective transmission or reception chains and respective antenna elements of a smart antenna system. A calibration signal is temporarily coupled into or from the transmission or reception chains via a selected one of the transmission or reception chains by using a portion of the transmission signal components, and a calibration signal parameter, influenced by said transmission or reception chains, is measured relative to a selected one of the transmission or reception chains. Then, a beamforming process of said smart antenna system is calibrated in response to a result of the measuring.
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Citations
57 Claims
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1-35. -35. (canceled)
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36. A method comprising:
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performing at least one of transmitting and receiving an orthogonal frequency division multiplex signal via a plurality of antenna elements; performing at least one of transmitting and receiving an orthogonal frequency division multiplex signal via one of at least one transmission chain and at least one reception chain; performing at least one of coupling the orthogonal frequency division multiplex signal via a switchable signal path from at least one transmission chain to at least one reception chain and coupling the orthogonal frequency division multiplex signal via a switchable signal path into at least one reception chain from at least one transmission chain; performing the at least one coupling by providing a calibration signal, the calibration signal being provided in a predetermined portion of the orthogonal frequency division multiplex signal; measuring the calibration signal relative to at least one of at least one transmission chain and at least one reception chain to provide beamforming control information; and calibrating the plurality of antenna elements with the beamforming control information. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 56)
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46. An apparatus comprising:
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a plurality of transmission chains and a plurality of reception chains; a plurality of antenna elements; at least one of at least one transmission chain configured to transmit an orthogonal frequency division multiplex signal via at least one antenna element and at least one reception chain, and at least one reception chain configured to receive an orthogonal frequency division multiplex signal via at least one antenna element and at least one transmission chain; coupling elements arranged to couple at least one of the orthogonal frequency division multiplex signal via a switching element from at least one transmission chain to at least one reception chain, and the orthogonal frequency division multiplex signal via a switching element to at least one reception chain from at least one transmission chain, wherein a calibration signal is provided in a predetermined portion of the orthogonal frequency division multiplex signal; a measuring unit configured to measure the calibration signal relative to at least one of at least one transmission chain and at least one reception chain, the measuring unit configured to provide beamforming control information; and a calibration unit configured to calibrate the plurality of antenna elements with the beamforming control information. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 57)
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Specification