Multi-antenna system and method for multiplexing feedback signal receiving link thereof

Abstract

The invention provides a multi-antenna system and a method for multiplexing a feedback signal receiving link thereof. The multi-antenna system comprises a plurality of transmitting links, the feedback signal receiving link and a digital processing unit. When the digital processing unit and a feedback link changeover switch select to connect the same transmitting link, the feedback signal receiving link is used for receiving a feedback signal from the connected transmitting link through a directional coupler of the connected transmitting link and transmitting the feedback signal to the digital processing unit; the digital processing unit is used for figuring out a digital predistortion coefficient according to the received feedback signal and performing digital predistortion treatment on the transmitting link; and simultaneously, the digital processing unit is used for getting calibration parameters of the plurality of transmitting links according to the received feedback signals of the plurality of transmitting links, and taking one transmitting link as a reference link to calibrate other one or plural transmitting links. The system and the method can save the area and the cost of a board through multiplexing a predistortion treatment circuit and the feedback signal receiving link.

Description

technical field [0001] The present invention relates to a multi-antenna system, in particular to a multi-antenna system and a method for multiplexing the receiving link of the multi-antenna system and its feedback signal. Background technique [0002] In multi-antenna beamforming systems, such as smart antenna systems, MIMO (Multiple Input Multiple Output-put) systems, and active antenna systems, multiple transmission channels are used to adjust the amplitude and phase on different channels, and the transmitted signal Superimposed on the air interface to form different spatial beams. Due to the large number of active and passive circuits on each channel, as well as the inevitable phase difference of local oscillators and other parts, there are differences in the delay, amplitude and phase of each transmitting channel. If the channel differences are not calibrated and compensated, then The air interface combination signal cannot be superimposed in-phase and canceled out-of-p...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the above-mentioned transmission link calibration loop and the above-mentioned digital pre-distortion loop are feedback signal receiving links, if the existing technical solutions are to realize digital Two operations of pre-distortion and transmit chain calibration require two sets of feedback signal receive chains, which increases board area and cost

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