Method and system for calibrating antenna

Abstract

The invention discloses a method and system for calibrating an antenna. The method comprises the following steps: a transmitting terminal groups subcarrier frequency points on a transmitting antenna, and determines a frequency domain calibration pilot signal according to the grouping; the transmitting terminal acquires a time domain integral calibration pilot signal according to the frequency domain calibration pilot signal, constructs a time domain transmitting signal by using the time domain integral calibration pilot signal, and transmits the time domain transmitting signal to the receiving terminal; the receiving terminal restores the received time domain transmitting signal into the time domain integral calibration pilot signal; the receiving terminal acquires the frequency domain response in each group according to the time domain integral calibration pilot signal, and acquires the frequency domain responses of all the subcarrier frequency points of the transmitting antenna according to the frequency domain response of each group; and the receiving terminal determines the compensating factor of the transmitting antenna according to the frequency domain responses of all the subcarriers. The use of the technical scheme can enhance the calibration estimation accuracy without affecting normal communication.

Description

technical field [0001] The present invention relates to the field of communications, and in particular, to an antenna calibration method and system. Background technique [0002] At present, in an Orthogonal Frequency Division Multiplexing-Time Division Duplex system (Orthogonal Frequency Division Multiplexing-Time Division Duplex, referred to as OFDM-TDD), in order to reduce co-channel interference between terminals and increase cell edge throughput and coverage, A multi-antenna beamforming technique with smaller inter-element spacing is introduced in the base station (eNodeB). In order to ensure the correctness and reliability of shaping, the antenna array must be calibrated to reduce the amplitude and phase errors of each channel of the array. [0003] In the related art, the antenna calibration technology of the Orthogonal Frequency Division Multiplexing (OFDM for short) system is mainly to jointly estimate the frequency of each transmitting antenna path at the receivin...

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Problems solved by technology

[0005] The above processing method only considers reducing the interference of DwPTS, but it does not consider that increasing the length of the selective cyclic prefix will extend the effective calibration pilot signal to the UpPTS time slot, which will not only affect the normal uplink communication, but also reduce the calibration accuracy

At the same time, when there is a random access signal sent in advance, there will be mutual interference between the calibration pilot signal and the random access signal

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