US 2018/0026766 A1Published application

Method and apparatus for calibration of an antenna

AssigneeChina Academy of Telecommunications Technology

InventorsChuanjun LI, Xin SU

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Abstract

An antenna calibration method and apparatus, which are used for improving calibration accuracy. In the embodiments of the present invention, sending direction radio frequency channels in an antenna array are grouped into M groups, an intra-group sending calibration pilot frequency sequence of each group of sending direction radio frequency channel is sent at different sending time slots in a time division manner, and along with the decreasing of the quantity of each group of sending direction radio frequency channels, a length of the intra-group sending calibration pilot frequency sequence mapped on each radio frequency channel used for channel estimation is increased, thereby improving the accuracy of an inter-channel compensation factor of each determined sending direction radio frequency channel.

Claims22

Dependent claims

A method for calibrating an antenna, the method comprising the operations of:

obtaining information about grouping of transmitting radio frequency channels, wherein the transmitting radio frequency channels in an array of antennas are grouped into M groups, and M is an integer more than 1;
transmitting intra-group transmission calibration pilot sequences corresponding respectively to the respective groups of transmitting radio frequency channels over the corresponding groups of transmitting radio frequency channels respectively in transmission timeslots of the intra-group transmission calibration pilot sequences, and performing channel estimation on the respective groups of transmitting radio frequency channels according to feedback signals of the intra-group transmission calibration pilot sequences received over a calibration receiving channel to obtain channel information of the M groups of transmitting radio frequency channels, wherein there are different transmission timeslots of intra-group transmission calibration pilot sequences corresponding to different groups;
and
determining inter-channel compensation coefficients of the respective transmitting radio frequency channels according to the channel information of the M groups of transmitting radio frequency channels.

1 more element

An apparatus for calibrating an antenna, the apparatus comprising a transceiver, a processor, and a memory, wherein the processor is configured to read and execute program in the memory:

to obtain information about grouping of transmitting radio frequency channels, wherein the transmitting radio frequency channels in an array of antennas are grouped into M groups, and M is an integer more than 1;
to transmit intra-group transmission calibration pilot sequences corresponding respectively to the respective groups of transmitting radio frequency channels over the corresponding groups of transmitting radio frequency channels respectively in transmission timeslots of the intra-group transmission calibration pilot sequences, and to perform channel estimation on the respective groups of transmitting radio frequency channels according to feedback signals of the intra-group transmission calibration pilot sequences received over a calibration receiving channel to obtain channel information of the M groups of transmitting radio frequency channels, wherein there are different transmission timeslots of intra-group transmission calibration pilot sequences corresponding to different groups;
and
to determine inter-channel compensation coefficients of the respective transmitting radio frequency channels according to the channel information of the M groups of transmitting radio frequency channels.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/550,326Filed 8 Jan 2016
Priority: CN 201510073800.011 Feb 2015
Published: 25 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04B 17/12
For calibration: of transmit antennas, e.g. of the amplitude or phase
H04L 5/0023
Three-dimensional division: time-frequency-space
H04L 25/0204
Channel estimation: of multiple channels

Family

US 10,536,247 B2Related patent
US 2018/0026766 A1This patent

From the US filing history. Foreign family members aren’t listed.

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