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IQ imbalance estimation and correction equipment, system and method

A technology of balance correction and equipment, which is applied in the field of IQ imbalance estimation and correction, and can solve problems such as poor correction results, frequency domain estimation and correction of IQ imbalance, and reduced system performance.

Active Publication Date: 2015-10-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above scheme is to estimate and correct the IQ imbalance in the frequency domain, ignoring the impact of the carrier frequency offset on the frequency domain subcarriers of the system, resulting in a large error in the estimated channel coefficient when the IQ imbalance between the transmitting end and the receiving end is unbalanced, causing the system Poor IQ imbalance correction results at the sending end and receiving end, reducing system performance

Method used

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  • IQ imbalance estimation and correction equipment, system and method
  • IQ imbalance estimation and correction equipment, system and method
  • IQ imbalance estimation and correction equipment, system and method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0203] figure 1 It is a schematic structural diagram of Embodiment 1 of a receiver device of the present invention, the device includes:

[0204] The demodulation module 101 is configured to perform orthogonal demodulation on the received training sequence sent by the transmitting end device.

[0205] The sequence generation module of the sending end device generates a training sequence, the training sequence is as figure 2 As shown, the training sequence includes M sections of training subsequences S (n); the length of each section of training subsequences S (n) is K, and the phase difference between two adjacent training subsequences is Each training subsequence S (n) includes two data frames; each data frame includes a cyclic prefix and a carrier signal, and the cyclic prefix CP of the two data frames 1 and CP 2 Same, the carrier signal of each data frame includes D subcarriers; the carrier signal s of the preceding data frame 1 The subcarrier of the positive frequenc...

Embodiment 2

[0295] Figure 5 It is a schematic structural diagram of Embodiment 2 of a transmitting end device according to the present invention, and the device includes:

[0296] The sequence generation module 501 is used to generate a training sequence.

[0297] The training sequence generated by the sequence generation module 501 in the transmitting end device is as follows: figure 2 shown is the training sequence demodulated by the receiving end device in the first embodiment, and two adjacent training subsequences have an angle of The length of each training subsequence is K, and there are a total of M training subsequences S(n) in the training sequence. Each training subsequence consists of two data frames, the cyclic prefix CP of the two data frames 1 and CP 2 The same, the carrier signal s of the two data frames 1 (n) and s 2 (n) is set to figure 2 In the format shown, the carrier signal s in the preceding data frame 1 The positive frequency sub-carrier of (n) is a non...

Embodiment 3

[0306] Image 6 It is a schematic structural diagram of a system for IQ imbalance estimation and correction according to the present invention, and the system includes:

[0307] The receiving end device 601 described in the first embodiment and the sending end device 602 described in the second embodiment.

[0308] In specific implementation, the system can be:

[0309] Both the transmitting end device 602 and the receiving end device 601 are base stations;

[0310] or,

[0311] The transmitting end device 602 is a base station, and the receiving end device 601 is a mobile terminal;

[0312] or,

[0313] The transmitting end device 602 is a mobile terminal, and the receiving end device 601 is a base station.

[0314] Optionally, the system can also be applied inside the transceiver to estimate and correct the transmit IQ imbalance and the receive IQ imbalance in the transceiver itself.

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Abstract

The invention provides IQ imbalance estimation and correction equipment, system and method. Quadrature demodulation of a received training sequence sent by a sending terminal is performed; a frequency offset estimate value of the training sequence is determined according to a reception signal in the demodulated training sequence; an IQ imbalance correction parameter of a receiving terminal is obtained through calculation according to the frequency offset estimate value; influences of carrier frequency offset are taken into consideration during estimation of the IQ imbalance correction parameter of the receiving terminal; an IQ imbalance correction parameter of the sending terminal is obtained according to the training sequence subjected to frequency offset compensation and the IQ imbalance correction by the receiving end; and influences of carrier frequency offset are also taken into consideration during estimation of the IQ imbalance correction parameter of the sending terminal. Therefore, IQ imbalance estimation and correction of the sending terminal is achieved. The IQ imbalance estimation and correction of the receiving terminal is achieved through a remote loopback mode, and the accuracy of IQ imbalance correction of a sending terminal and a receiving terminal of a system is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a device, system and method for estimating and correcting IQ imbalance. Background technique [0002] In the wireless communication system, the transmitting end device is provided with an orthogonal modulator (IQ modulator), and the receiving end device is provided with an orthogonal demodulator (IQ demodulator). For low-frequency and narrow-band systems, the quadrature modulator and quadrature demodulator can be realized through digital systems, and the quadrature modulation and demodulation of signals are close to ideal characteristics. However, in ultra-high frequency (60GHz or E-Band) and ultra-wideband (greater than 1GHz) communication systems, due to the limitation of DAC performance, only analog quadrature modulators and quadrature demodulators can be used. [0003] In the sending end device, the signal generated by the digital-to-analog converter (DAC) is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 严茜黄煌王光健李亚波吴芬芳
Owner HUAWEI TECH CO LTD
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