In-phase/quadrature (IQ) imbalance compensation method for differential encoding orthogonal frequency division multiplexing (OFDM) system

A differential coding and balanced compensation technology, applied in multi-frequency code systems, diversity/multi-antenna systems, transmission systems, etc., can solve problems such as slow convergence speed, poor compensation performance, and poor channel conditions, and achieve improved convergence speed and compensation. The effect of performance loss

Inactive Publication Date: 2017-07-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, the I\Q imbalance compensation algorithm is mainly a generalized linear compensation algorithm. However, due to the poor channel conditions, although this algorithm can compensate for the I\Q imbalance to a certain extent, its convergence speed is very slow and the compensation performance is poor.

Method used

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  • In-phase/quadrature (IQ) imbalance compensation method for differential encoding orthogonal frequency division multiplexing (OFDM) system
  • In-phase/quadrature (IQ) imbalance compensation method for differential encoding orthogonal frequency division multiplexing (OFDM) system
  • In-phase/quadrature (IQ) imbalance compensation method for differential encoding orthogonal frequency division multiplexing (OFDM) system

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[0047] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0048] Such as image 3 Shown, is the schematic flow chart of the method of the present invention, the data that the method of the present invention needs input is baseband signal signal Z ' (k) and And be provided with the initialization cycle number t=0, according to the preset threshold value Nini, use Γ when t is less than or equal to the threshold value c (k) and Update estimates¶ t and gamma r , since the I\Q imbalance at the receiving end is almost constant, the estimated result is valid for a long time. The method of the present invention is mainly aimed at when the number of cycles is greater than the threshold, and the specific method has been described in detail in the summary of the invention.

[0049] Such as figure 2 As shown, the present invention compares the bit error performance of different compensation methods for I\Q imbalance und...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to an in-phase/quadrature (IQ) imbalance compensation method for a differential encoding orthogonal frequency division multiplexing (OFDM) system. The method mainly utilizes compensating parameters of a subcarrier and a mirror image subcarrier to perform combined estimation, thus compensating the IQ imbalance in the system. The IQ imbalance compensation method for the differential space-time encoding OFDM system comprises the steps of estimating the compensating parameters in the subcarrier and a subcarrier mirror image, updating a compensation matrix, and using the compensation matrix to compensate an original carrier. According to the method, the data of the two subcarriers is used for estimating a compensation vector together while the accuracy is not lost, and the convergence rate of the algorithm doubles that of a generalized linear algorithm.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an IQ imbalance compensation method used in a differential coding OFDM system. Background technique [0002] With the popularization of high-speed wireless communication systems, a large number of emerging multimedia content and application scenarios have increased people's demand for multi-Gbps or even higher-speed communication. In order to provide sufficient transmission bandwidth for new application scenarios, the conventional communication frequency band below 6 GHz can no longer meet the demand. Therefore, more and more scholars have shifted their research focus to the millimeter wave frequency band and the terahertz frequency band with a large amount of spectrum resources. At the same time, due to the increasingly rich types of transmission services carried by mobile communication networks and the obvious heterogeneity of wireless networks, the same terminal d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04L27/38H04L27/26H04L25/02H04B7/04
CPCH04L27/364H04B7/0413H04L25/0202H04L25/0242H04L27/2601H04L27/2602H04L27/3872
Inventor 徐小珂陈雷岳光荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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