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RRU antenna calibration method, apparatus and system

A technology for antenna calibration and calibration coefficients, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve problems such as difficult to guarantee accuracy, dependence on accuracy, and occupying air interface resources, achieving high accuracy and ensuring reciprocity , The effect of saving air interface resources

Active Publication Date: 2013-10-30
CHINA MOBILE COMM GRP CO LTD
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  • Summary
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  • Claims
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Problems solved by technology

This solution requires the UE to feed back inter-cell information, and the accuracy of the calibration coefficient calculation is strongly dependent on the amount of feedback, and the accuracy is difficult to guarantee
[0028] The existing antenna transceiver channel calibration scheme between RRUs needs to use the air interface to obtain channel information for corresponding calibration, occupying air interface resources

Method used

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  • RRU antenna calibration method, apparatus and system
  • RRU antenna calibration method, apparatus and system
  • RRU antenna calibration method, apparatus and system

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Such as image 3 As shown, the embodiment of the RRU antenna calibration method of the present invention includes:

[0063] Step 302, calculate the inter-RRU calibration coefficient corresponding to the calibration port of each RRU according to the calibration signal transmitted by each RRU calibration port through the interconnection, as follows:

[0064] (1) Calculate the calibration coefficient of the transmission path between RRUs corresponding to the transmission path of each calibration port:

[0065] a. The transmission channels of all the calibration ports transmit the calibration signal s;

[0066] b. The receiving channel of the reference calibration port receives the calibration signals transmitted by each calibration port (including the reference calibration port itself):

[0067] the y 11 = r 10 t 10 s, y 12 = r 10 t 20 s, y 13 = r 10 t 30 s;

[0068] c. Obtain the characteristic difference of the emission path of multiple calibration ports:

...

Embodiment 2

[0100] Such as Figure 4 As shown, another embodiment of the RRU antenna calibration method of the present invention includes:

[0101] Step 402, calculate the inter-RRU proportional calibration coefficient corresponding to the calibration port of each RRU according to the calibration signal transmitted by each RRU calibration port through the interconnection, as follows:

[0102] a. Except for the reference calibration port (the calibration port of the first RRU), the transmission channels of other calibration ports transmit the calibration signal s;

[0103] b. The receiving path of the calibration port of the reference calibration port receives the calibration signal:

[0104] the y 12 = r 10 t 20 s, y 13 = r 10 t 30 s;

[0105] c. Transmitting a calibration signal s through the transmission path of the reference calibration port;

[0106] d. The receiving channel of the calibration port other than the reference calibration port receives the calibration signal:

...

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Abstract

The invention discloses an RRU antenna calibration method, an apparatus and a system. The method comprises the steps of calculating a corresponding calibration coefficient among RRUs to each calibration port according to different RRU calibration ports through calibration signals in interconnected transmission; calculating a corresponding calibration coefficient in a RRU to each antenna in the RRU according to different antennas in the RRUs and the calibration signals transmitted by the calibration ports; and calibrating antenna transmitting channels and antenna receiving channels according to the calibration coefficients among the RRUs and the calibration coefficients in the RRUs so that the proportions of the antenna transmitting channels and the antenna receiving channels are same. The RRU antenna calibration method, the apparatus and the system calibrate different RRU calibration ports through interconnection among the RRUs or side connection of the antennas, and then calibrate the antennas in the RRUs by using the calibration ports, thereby enabling the calibration of the antennas among the RRUs and guaranteeing reciprocity of uplink and downlink channels of a TDD system with high accuracy, less improvement on equipment and lower cost.

Description

technical field [0001] The present invention relates to a wireless technology, in particular to a RRU antenna calibration method, device and system. Background technique [0002] Coordinated multi-point (CoMP for short) transmission technology introduces cooperation among multiple cells, and reduces / coordinates interference between multiple cells by using shared channels, user data or scheduling information at the base station, thereby effectively improving system throughput especially is the quality of service for cell edge users. [0003] In a CoMP Joint Transmission (JT) system, the base station needs to know downlink channel information to preprocess user data. If the downlink channel is obtained through user feedback of channel information, a large amount of information feedback will have a great impact on system performance. For a time division duplex (TDD) system, since the transceivers share the same propagation channel (same frequency), theoretically the uplink pr...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
Inventor 金婧王启星闫渊许灵军胡臻平刘光毅
Owner CHINA MOBILE COMM GRP CO LTD
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