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In-phase component and quadrature component mismatch compensation device and method

A technology of in-phase component and quadrature component, applied in the field of communication, can solve the problem of reducing I/Q single-channel signal amplitude compensation gain, etc., to achieve the effect of reducing the data range, reducing the chance of DAC overflow, and reducing the amplitude compensation gain

Active Publication Date: 2019-03-19
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to solve the above technical problems, the present invention provides an in-phase component and quadrature component mismatch compensation device and method, which can reduce the amplitude compensation gain of the I / Q single-channel signal, thereby reducing the chance of Q-channel overflow and reducing the Q-channel amplitude compensation. Excessive situation

Method used

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  • In-phase component and quadrature component mismatch compensation device and method
  • In-phase component and quadrature component mismatch compensation device and method

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Embodiment 1

[0184] The above-mentioned improvements to the compensator B are applicable to both the position of the compensator B on the transmitting side and the position of the compensator B on the receiving side in the existing scheme. Wherein, the structure of the filter in the compensator B is a traditional FIR filter structure, which is the same as that of the prior art. For example, when the number of taps is 9, only 5 taps in the 9-tap filter are non-zero, and only 3 of the 5 taps are not repeated, that is, h1~h3, where h2 is shared by 2 taps, and h3 is shared by 2 taps. 2 taps are shared. It should be emphasized that the aforementioned 9 taps are just an example. On this basis, the present invention provides a generalized mathematical description of the filter design method. For the convenience of expression, this scheme stipulates the following representation: Let the total number of taps of the filter be X, which must be an odd number, and satisfy the condition "(X+3) / 4 is an...

Embodiment 2

[0194] This preferred embodiment shows a way of IQ mismatch estimation and compensation. Such as Figure 12 As shown, it can be divided into two parts: the estimation process and the calibration process. The estimation process can be divided into the estimation process of the IQ mismatch value and the calculation process of the IQ compensator coefficient. That is, the two major tasks of the estimation process are mismatch estimation and coefficient estimation.

[0195] To start the mismatch estimation, the IQ calibration mode must be turned on first. At this time, the receiving and transmitting circuits disconnected in normal communication will be connected through the angle shifter, such as Figure 13 shown.

[0196] It should be noted that the improvement of the internal structure of the compensator B and the addition of the attenuator involved in the present invention belong to the improvement of the coefficient estimation process, and do not depend on the mismatch estim...

Embodiment 3

[0225] This preferred example demonstrates the extension of the present invention to the number of filter taps and calculation of coefficients in compensator B.

[0226] If it is necessary to design a filter greater than 9 taps, according to the principles announced by the present invention, the number of taps X should satisfy the condition of "(X+3) / 4 is an integer", that is, the number of taps that satisfies this condition closest to 9 taps for 13. It can also be estimated that the number of non-zero taps is (X+1) / 2, that is, 7, and the number of tap coefficients is (X+3) / 4, that is, 4, which are set as h1 to h4 in sequence. h1 is the coefficient of tap C(7), h2 is the coefficient of tap C(5) and C(9), h3 is the coefficient of tap C(3) and C(11), h4 is the coefficient of tap C(1) and C( 13) Coefficient. Such as Figure 19 Shown, the calculation of each coefficient uses the formula of the present invention as follows:

[0227]

[0228]

[0229]

[0230]

[023...

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Abstract

The invention discloses an in-phase component and quadrature component mismatch compensation device and method. The device comprises a first in-phase amplitude compensation unit and a first quadratureamplitude compensation unit, wherein the first in-phase amplitude compensation unit is used for performing subtraction on a signal output by an in-phase component through a first delay unit and a signal output by the in-phase component through a first filtering unit to obtain the in-phase component subjected to amplitude compensation; the first quadrature amplitude compensation unit is used for performing addition on a signal output by a quadrature component through a second filtering unit and a signal output by the quadrature component through a second delay unit to obtain the quadrature component subjected to amplitude compensation; the first filtering unit and the second filtering unit are the same in structure; and the first delay unit, the second delay unit and the first filtering unit are the same in delay time. The filtering units are used for compensating amplitude mismatch of two I / Q signals at the same time, so that the amplitude compensation gain of the single I / Q signal isreduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a device and method for in-phase component and quadrature component mismatch compensation. Background technique [0002] In the Orthogonal Frequency Division Multiplexing (OFDM) communication system with direct up-down conversion, the analog radio frequency circuit is greatly simplified compared with the traditional intermediate frequency radio frequency circuit, but at the same time, the deviation of the chip manufacturing process has a great impact on the system. The impact of the in-phase (In-phase) component and quadrature (Quadrate) component mismatch phenomenon is one of the interference items that has a greater impact on system performance. Its essence is the IQ (In-phase Quadrate) transmitted at the same time. , IQ) two-way signals, their amplitudes are inconsistent, and their phases do not strictly satisfy the 90-degree quadrature relationship. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04L27/38
CPCH04L27/367H04L27/3863H04L27/3872
Inventor 白栎旸徐进刘览孙远航李彧
Owner SANECHIPS TECH CO LTD
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