IQ unbalanced calibration method and equipment of baseband signals in wireless communication receiving machine

Abstract

The invention provides an IQ unbalanced calibration method and equipment of baseband signals in a wireless communication receiving machine. The method comprises the following steps that: the receiving machine receives radio frequency signals, and generates identical phase component path I signals and orthogonal component path Q signals through signal processing; a self correlation valve E(|I|2) of the path I signals, a self correlation value E(|Q|2) of the current path Q signals and a mutual correlation value E(IQ) of the path I signals and the path Q signals are obtained through calculation; carrying out four arithmetic operation on E(|I|2), E(|Q|2) and E(IQ); an estimated value of the current magnitude unbalanced calibration factor and an estimated value of the current phase unbalanced calibration factor are obtained through calculation; and the current path Q signals are calibrated according to the estimated values. The embodiment of the invention can reduce the operation quantity.

Description

technical field The invention relates to signal processing technology, in particular to a method and equipment for calibrating IQ imbalance of baseband signals in a wireless communication receiver. Background technique In the actual radio frequency (Radio Frequency, RF), the phases of the in-phase component and the quadrature component (In-phaseQuadrate, IQ) cannot be completely orthogonal, and the IQ gain cannot be completely consistent. This is called IQ imbalance. IQ imbalance will worsen the error vector magnitude (Error VectorMagnitude, EVM). Assuming that the amplitude imbalance gain is g and the phase imbalance factor is θ, the theoretical mathematical model of RF IQ imbalance is: u I ( k ) u Q ...

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Problems solved by technology

In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: From the above calculation scheme, it can be seen that the prior art uses hardware or software to realize the calibration of the IQ signal in the baseband signal, and involves the square root operation when processing related signals And the calculation of trigonometric functions requires a large amount of calculations performed by equipment or software, which increases the complexity of equipment or software implementation

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