Digital pre-distortion correcting device and method against IQ unbalance distortion

A technology of digital pre-distortion and balance correction, which is applied in the direction of DC level restoration device/bias distortion correction, digital transmission system, electrical components, etc., and can solve the problems of increasing hardware overhead and system complexity

Active Publication Date: 2015-04-29
CERTUS NETWORK TECHNANJING
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Problems solved by technology

However, the additional feedback circuit greatly increases the hardware overhead and system complexity

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  • Digital pre-distortion correcting device and method against IQ unbalance distortion
  • Digital pre-distortion correcting device and method against IQ unbalance distortion
  • Digital pre-distortion correcting device and method against IQ unbalance distortion

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] The IQ imbalance correction method proposed by the present invention will be further described below in conjunction with specific embodiments and accompanying drawings, so as to make the spirit, technical features and beneficial effects of the present invention easier to understand.

[0040] figure 1 Shown is a structure diagram of a digital predistortion system for IQ imbalance correction provided by the present invention. Specifically include: data receiving module, analog-to-digital converter ADC, digital pre-distortion module, digital-to-analog converter DAC and radio frequ...

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Abstract

The invention puts forward an IQ unbalance correcting technology based on a digital pre-distortion system and belongs to the field of wireless communication. After quadrature modulation, signals enter the digital pre-distortion system by two paths, channel estimation is firstly conducted to obtain corresponding estimation parameters and data initialization is carried out; then based on input in-phase signals and orthogonal signals, direct current offset factors of the in-phase signals and the orthogonal signals are calculated and direct current compensation is conducted; based on the input in-phase signals and orthogonal signals, gain unbalance factors and phase unbalance factors of the in-phase signals and the orthogonal signals are calculated; according to a mirror image correction model, corresponding factors are substituted to carry out the mirror image correction; finally, the compensated gain factors and the phase factors are updated and the IQ unbalance correcting process is completed. By means of the digital pre-distortion correcting method against the IQ unbalance distortion, system hardware complexity and the cost can be reduced, and meanwhile error estimation precision and compensation precisions are improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an in-phase (I) and quadrature-phase (Q) imbalance correction (IQ imbalance correction) device and method in a multi-carrier wireless communication system. Background technique [0002] Wireless communication systems and related standards are continuously using more complex modulation techniques such as 64QAM and OFDM (Orthogonal Frequency Division Multiplexing) to increase the throughput of communication channels. These more complex modulation techniques increase the imbalance between the in-phase (I) and quadrature-phase (Q) paths for low-cost direct conversion receivers and transmitters. The baseband in-phase and quadrature-phase IQ signals usually have a certain difference in the gain of the two output signals after quadrature modulation, which causes gain imbalance and distortion. The gain imbalance between the I and Q channels is determined by the mixer , filters and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H04L25/06H04L25/49
CPCH04L25/49H04L27/364H04L27/3863
Inventor 唐宏李玉妍李兆玉黄锐田燕夏小夏粟根花余瑶
Owner CERTUS NETWORK TECHNANJING
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