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
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[0061] Method embodiment one
[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 inter-RRU transmission path calibration coefficient corresponding to the transmission path of each calibration port:
[0065] a. The emission path of all calibration ports emits the calibration signal s;
[0066] b. The receiving path of the reference calibration port receives the calibration signal transmitted by each calibration port (including the reference calibration port itself):
[0067] 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 transmission path of multiple calibration ports:
[0069] y 12 y ...
Example Embodiment
[0099] Method embodiment two
[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 ratio 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 (calibration port of the first RRU), the transmission path of the calibration port transmits the calibration signal s;
[0103] b. The receiving channel of the calibration port of the reference calibration port receives the calibration signal:
[0104] y 12 =r 10 t 20 s, y 13 =r 10 t 30 s;
[0105] c. Transmit the calibration signal s with reference to the emission path of the calibration port;
[0106] d. In addition to the reference calibration port, the receiving channels of other calibration ports receive calibration signals:
[0107] y 21...
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