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IQ imbalance estimation and compensation method of OFDM-WLAN radio frequency testing system

A technology of OFDM-WLAN and radio frequency test system, which is applied in the field of transmitter IQ imbalance estimation and compensation, and can solve the problem that the transmitter IQ imbalance is not deep enough

Active Publication Date: 2016-08-10
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: In view of the problem that the IQ imbalance of the transmitter is not deep enough in the existing research, the present invention proposes a method for estimating and compensating for the IQ imbalance in the transmitter of the OFDM-WLAN radio frequency test system

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  • IQ imbalance estimation and compensation method of OFDM-WLAN radio frequency testing system

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Embodiment Construction

[0046] The invention discloses a method for estimating and equalizing IQ imbalance in a wireless local area network. In order to carry out necessary channel estimation and tracking, the wireless local area network standard IEEE 802.11a / g / n / ac provides a long training sequence, and inserts pilot information in the symbol, and the present invention provides a channel and IQ A method for joint estimation and equalization of imbalances.

[0047] Taking the IEEE 802.11ac signal as an example, the method proposed in the invention will be further described in detail in conjunction with the accompanying drawings.

[0048] attached figure 1 That is, the transmitter system when there is amplitude and phase imbalance. In this system, the IQ imbalance is mainly caused by the system clock, and its influence is constant in each frequency band of the transmitted signal, which is called frequency-independent IQ. unbalanced. Assume that the amplitude and phase imbalance parameters caused by...

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Abstract

The invention discloses an IQ imbalance estimation and compensation method applicable to an OFDM-WLAN radio frequency testing system. The IQ imbalance estimation and compensation method comprises the steps of firstly obtaining coarse estimation of an IQ imbalance parameter by utilizing a long training sequence of a WLAN signal based on the smoothness characteristic of a channel impact response; then carrying out iterative operation by using pilot frequency information in a symbol based on a minimum mean square error criterion so as to obtain more precise amplitude and phase error estimation; and carrying out united balancing of the IQ imbalance and a channel for a signal based on the estimation result. The IQ imbalance estimation and compensation method is applicable to the condition that a channel has frequency selectivity; and compared with the traditional LMS algorithm, the IQ imbalance estimation and compensation method speeds up the convergence speed of the algorithm greatly as an initial value approximate to a steady-state solution can be obtained only by adding a small amount of computation, also can obtain a good estimation and compensation effect in the presence of a relatively small number of the symbols, and has very strong practicability.

Description

technical field [0001] The invention relates to a method for estimating and compensating transmitter IQ imbalance in an OFDM-WLAN radio frequency consistency testing system, and belongs to the fields of signal processing and wireless communication. Background technique [0002] IQ imbalance refers to the mismatch in magnitude and phase between the in-phase branch and quadrature of the transmitter and receiver. In an ideal situation, the gains of the I and Q channels are equal, and the phases are strictly orthogonal, but the actual circuit system is difficult to achieve the above ideal situation, the non-ideal up-and-down conversion operation of the transmitter and receiver, the Any unbalanced filter in between will introduce IQ imbalance in the system. [0003] Transceivers in traditional communication systems mostly adopt the classic superheterodyne architecture, which has a good performance in suppressing image interference, but in mobile terminals, the factors of compone...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/0212H04L25/022H04L25/03178H04L2025/03624H04L2025/03636
Inventor 裴文江朱磊王开夏亦犁
Owner SOUTHEAST UNIV
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