IQ imbalance correction method, device and circuit for broadband multi-channel radio frequency transceiver

Abstract

The invention discloses an IQ imbalance correction method for a broadband multi-channel radio frequency transceiver. The method comprises the following steps: 1, transmitting a signal through an I path and a Q path, receiving the signal through one path of the I path or the Q path to obtain two groups of loop signal data, calculating a coefficient value of an FIR filter, setting the FIR filter onthe Q path, and setting a delay unit on the I path; 2, selecting a test signal, transmitting the test signal through two phase shift angles to obtain two groups of local loop signal data, and calculating an unbalance parameter, a gain ratio and a phase difference; and 3, setting an adder and a multiplier to correct the gain ratio and the phase difference. The method has the beneficial effects of low operation complexity and high correction accuracy. The invention further discloses an IQ imbalance correction device for the broadband multichannel radio frequency transceiver, and the IQ imbalancecorrection device has the advantages of being simple in structure and accurate in correction. The invention further discloses an IQ imbalance correction circuit of the broadband multichannel radio frequency transceiver, and the IQ imbalance correction circuit has the advantages of being simple in circuit and accurate in correction.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication. More specifically, the present invention relates to a method, device and circuit for correcting IQ imbalance of a broadband multi-channel radio frequency transceiver. Background technique [0002] The 4G network has gradually completed the evolution to the 5G network, and ultra-wideband and multi-channel are the key to achieving ultra-high throughput related to 5G. The sample rate of the device is very attractive. However, one of the main problems is that the imbalance of in-quadrature and positive phase (IQ) will produce image signals, and the image signals will cause the reduction of signal-to-noise ratio, thereby affecting the performance of communication. Specifically, the receiver and transmitter can each include Separate branches for in-phase (I) and quadrature (Q) signals. Ideally, the I and Q paths have equal gain and are 90 degrees apart from each other. However...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for IQ imbalance correction. These methods provide a lot of basis for solving IQ imbalance, but some of them only correct the IQ imbalance of the receiving end, and do not consider the imbalance of the sending end. Therefore, the image signal Inhibition tends to be lower

In addition, with the increase of the transmission bandwidth, it is no longer true to assume that the IQ imbalance is the same over the entire bandwidth. Most of the previous IQ imbalance correction methods that assume the same entire bandwidth have gradually become unsuitable for today’s communication conditions. Considering the frequency-related The method has high hardware complexity, therefore, it is necessary to propose an IQ imbalance correction method that can solve this high bandwidth situation and requires the lowest possible hardware complexity

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