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Method, apparatus and system for calibration of reception links in multiple antennas beam forming system

A receiving link and beamforming technology, applied in the field of communication, can solve problems such as business signal interference

Active Publication Date: 2014-04-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of implementing the calibration method for the receiving link in the above-mentioned multi-antenna beamforming system, the inventor found that there are at least the following shortcomings in the prior art, including: the sent detection signal needs to be coupled into the service signal band through a directional coupler, cause interference to business signals

Method used

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  • Method, apparatus and system for calibration of reception links in multiple antennas beam forming system

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Embodiment 1

[0031] An embodiment of the present invention provides a method for calibrating a receiving link in a multi-antenna beamforming system, such as figure 1 As shown, the method includes:

[0032] 101. Multiple receiving links receive signals, where the signals include at least a calibration signal, where the calibration signal includes a single-tone signal sent by a local oscillator and whose frequency is located at a junction of two adjacent service carriers.

[0033] Wherein, in the embodiment of the present invention, when calibrating the receiving link in the multi-antenna beamforming system, the system controller controls the local oscillator to send the calibration signal, and the coupler feeds the calibration signal into the In the multiple receiving chains; while the calibration signal is sent out, multiple receiving links in the system may be receiving service signals, or may be in an idle state; when the receiving chain is receiving service signals, The signal received...

Embodiment 2

[0039] An embodiment of the present invention provides a method for calibrating a receiving link in a multi-antenna beamforming system, such as figure 2 As shown, the method includes:

[0040] 201. A plurality of receiving links receive signals, and the signals include at least a calibration signal, and the calibration signal includes a tone signal sent by a local oscillator at the intersection of two adjacent service carriers, and the calibration signal The power is 20dB higher than the low noise of the receive chain.

[0041] Wherein, in the embodiment of the present invention, when calibrating the receiving link in the multi-antenna beamforming system, the system controller controls the local oscillator to send the calibration signal, and the coupler feeds the calibration signal into the In the multiple receiving chains; while the calibration signal is sent out, multiple receiving links in the system may be receiving service signals, or may be in an idle state; when the rec...

Embodiment 3

[0060] An embodiment of the present invention provides a calibration device for a receiving link in a multi-antenna beamforming system, such as image 3 As shown, the device includes: a receiving unit 31 , a correlation computing unit 32 , a first adjusting unit 33 , and a computing unit 34 .

[0061] The receiving unit 31 is configured to receive signals of a plurality of receiving links, the signals at least include a calibration signal, and the calibration signal includes a single-tone signal sent by a local oscillator at the intersection of two adjacent service carriers. Wherein, the receiving unit 31 may be a signal receiving link in a specific implementation.

[0062] In order to further avoid the interference of the calibration signal to the service signal, the power of the calibration signal can be set to be 20dB higher than the low noise of the receiving link, but in specific implementation, an error of up and down 1dB can be allowed. Because of the directivity of th...

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Abstract

The embodiments of the present invention, belonging to the communication field, provide a method and apparatus for calibration of reception links in a multiple antennas beam forming system, wherein, service signals are not interfered in the process of calibrating the reception links. The method of the present invention includes: multiple reception links receive signals, said signals include at least a calibration signal, and said calibration signal includes a single tone signal transmitted by a local oscillator and with a frequency locating on the common boundary of two adjacent service carriers; performing correlation operation on said received signals to get the relative difference values of the amplitude, phase and relay, between each reception link and the reference reception link, compensating for above mentioned difference values, and performing operation on the corresponding coefficients of the digital beam forming to get the combining calibration signal after digital beam forming. The embodiments of the present invention are mainly used in the calibration process of the reception links in a multiple antennas beam forming system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for calibrating a receiving link in a multi-antenna beamforming system. Background technique [0002] In multi-antenna beamforming systems, such as smart antenna systems, MIMO (Multiple-inputMultiple-output, input-output) systems, and active antenna systems, all use multiple receiving links to adjust the amplitude and phase on different links, and The received multi-channel signals are superimposed in the digital domain to form different spatial beams. In the process of forming the spatial beam, since there are many active and passive circuits, local oscillators and microstrip transmission lines on each receiving link, the signals transmitted on the receiving link are inevitably There is a phase difference, which makes the delay, amplitude, and phase of each receiving link different. If the delay, amplitude, and phase difference of the receiving link...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q3/26H01Q21/00
CPCH01Q3/267
Inventor 李少明
Owner HUAWEI TECH CO LTD