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Novel transmitter IQ imbalance estimation and compensation method and device

A compensation method and transmitter technology, applied in the field of communication, can solve the problems of low precision of lookup table and the like

Pending Publication Date: 2021-03-05
SHANGHAI NUFRONT ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For low-power application scenarios, the look-up table method is generally used for correction, but the accuracy of the look-up table method is low

Method used

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  • Novel transmitter IQ imbalance estimation and compensation method and device
  • Novel transmitter IQ imbalance estimation and compensation method and device
  • Novel transmitter IQ imbalance estimation and compensation method and device

Examples

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Embodiment 1

[0080] This embodiment provides a novel transmitter IQ imbalance estimation and compensation method, such as figure 1 shown, including:

[0081] S101. Amplitude imbalance compensation, calculating the amplitude gain ratio of the IQ two-way; further, the calculation of the amplitude gain ratio of the IQ two-way, such as Figure 1a shown, including the following steps:

[0082] S101a.IQ two-way signal passes through filter and frequency mixing (Mixer); The signal after mixing is through the square ring operation; Concretely, let the I-way sending signal be x BBI =kcos(ω 1 t), the sending signal of the Q road is 0, and the output of the I road after the square loop is:

[0083]

[0084] where w 1 is the frequency of the transmitted test signal, w c Is the carrier frequency, and k is the amplitude of the test signal;

[0085] Expand the above formula further:

[0086]

[0087] It can be seen that after the square loop operation, the I output signal includes direct cu...

Embodiment 2

[0161] This embodiment provides a novel transmitter IQ imbalance estimation and compensation device, such as figure 2 shown, including:

[0162] The amplitude imbalance compensation module 210 is used to calculate the amplitude imbalance of the transmitter IQ and perform amplitude compensation;

[0163] Phase imbalance compensation module 220, used to calculate the phase imbalance of transmitter IQ and perform phase compensation;

[0164] DC imbalance compensation module 230; used to calculate the DC imbalance of the transmitter IQ and perform DC compensation;

[0165] The amplitude imbalance compensation module 210 includes an analog estimation unit 211 and a first digital estimation unit 212, and an amplitude compensation unit 213;

[0166] Specifically, the shown analog estimation unit 211 includes: a square loop 211a and an analog low-pass filter 211b;

[0167] The IQ two-way signal passes through the filter and the mixer (Mixer), and the mixed signal passes through th...

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Abstract

The invention discloses a novel transmitter IQ imbalance estimation and compensation method and device, and the method comprises the steps: calculating the amplitude gain ratio of two channels I and Q, solving the amplitude imbalance according to the amplitude gain ratio of the two channels I and Q, and carrying out the amplitude imbalance compensation; calculating the phase imbalance of the two channels I and Q and performing compensation; and calculating the DC imbalance of the two channels I and Q and performing compensation. According to the IQ imbalance estimation and compensation methodand device, the amplitude, phase and DC imbalance values can be accurately obtained, the power consumption is low, and the efficiency is high.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a novel transmitter IQ imbalance estimation and compensation method and device. Background technique [0002] In electronic communication systems, the correction of IQ imbalance is a key factor related to the signal peak-to-average ratio and demodulated Ber. In the transmitter, due to the possible imbalance of the carrier phase, the DC imbalance that may exist in the digital-to-analog converter DAC and other devices , The gain imbalance that may exist in the power amplifier PA and other devices may cause the transmitted signal to be non-orthogonal, which in turn reduces the peak-to-average ratio of the signal and the demodulated Ber. In this regard, the industry has proposed many kinds of IQ imbalance estimation and compensation techniques, so as to improve the quality of signal transmission and reception. [0003] At present, most of the IQ imbalance estimation and compens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03343
Inventor 周海然杨利鲍东山
Owner SHANGHAI NUFRONT ELECTRONICS TECH
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