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Digital correction method for IQ channel mismatch of novel broadband receiver

A broadband receiver and digital correction technology, applied in the communication field, can solve the problems of reduced test accuracy and long calculation time, and achieve the effect of avoiding the selection of DFT transformation points

Inactive Publication Date: 2016-06-08
WUHAN HONGXIN TELECOMM TECH CO LTD
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Problems solved by technology

Generally, the more points of DFT transformation, the higher the test accuracy, but the required calculation time will be correspondingly longer; reducing the number of DFT points, the required calculation time will be shortened, but the test accuracy will be reduced

Method used

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  • Digital correction method for IQ channel mismatch of novel broadband receiver
  • Digital correction method for IQ channel mismatch of novel broadband receiver
  • Digital correction method for IQ channel mismatch of novel broadband receiver

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0051] When the method is implemented, the adaptive correction is realized in the digital domain chip FPGA by coupling the radio frequency modulation output and down-converting to the baseband.

[0052] Suppose the system inputs a single-frequency signal f(t)=Acos(2πf c t+θ), f c For the input signal frequency, θ is the initial phase. After mixing, the I / Q signals at the output end are:

[0053] I(n)=A I cos(2πfn+θ)d 1

[0054]

[0055] Among them, A I 、A Q are the amplitudes of I and Q signals respectively, f is the output frequency, is the phase error, d 1 、d 2 They are the DC components of I and Q respectively. When the following conditions are met:

[0056] f c f s ...

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Abstract

The invention provides a digital correction method for IQ channel mismatch of a novel broadband receiver. The digital correction method for the IQ channel mismatch is proposed by fully utilizing the magnitude-frequency characteristic of an IQ digital signal on the basis of narrowband signal correction. An orthogonal error exists in zero intermediate frequency modulation, and a generated residual mirror image and a carrier leakage signal can generate in-band interference, thus reducing the signal-to-noise ratio of a modulation signal and scattering constellation points. The IQ correction closed loop method that has non-ideal characteristics and is easy to implement provided by the invention provides a basic method and a specific operation. The method has the advantages of simple algorithm, little hardware resource occupation, strong portability, simple and convenient subsequent maintenance and so on. By adopting the method, the mirror image and the power of the carrier leakage of the signal on the frequency spectrum can be reduced, the amplitude-phase error within the entire working bandwidth is effectively corrected, the dynamic range of a wireless communication device is expanded, the requirements of a broadband wireless communication system are satisfied, and the signal-to-noise ratio of the modulation signal is increased.

Description

technical field [0001] The invention relates to a digital correction method for IQ channel mismatch of a novel broadband receiver, which is mainly used in the communication field. Background technique [0002] In modern communication systems, due to the influence of various factors, mismatches usually occur between I / Q channels, which will reduce the dynamic range of the receiver, and then affect the performance of the entire communication system. [0003] Since it is easy to obtain the three characteristic parameters of the target signal, namely instantaneous amplitude, instantaneous phase and instantaneous frequency, from the orthogonally changing I / Q two-way signals, orthogonal dual-channel processing technology is often used in modern communication systems. At the same time, quadrature dual-channel processing doubles the system bandwidth while maintaining the same sampling frequency. At the receiving end of the wireless communication system, due to the influence of anal...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04L25/06
CPCH04L27/3863H04L25/06
Inventor 金剑欧文军江鹏刘永飘
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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