Single carrier system IQ (In-phase\Quadrature) imbalance compensation method based on Golay sequence

A compensation method and single-carrier technology, applied in baseband systems, baseband system components, transmission systems, etc., can solve problems such as data crosstalk, I\Q imbalance, and difficulty in oscillating signal amplitudes, achieving good compensation performance, The effect of reducing system cost

Inactive Publication Date: 2017-09-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the actual system, since the I\Q two-way oscillation signals are synthesized by the crystal oscillator and the phase-locked loop, and then obtained through the Hilbert transform, the amplitudes of the two-way oscillation signals are difficult to be exactly the same, and the phase difference is not 90°. Causes crosstalk between I\Q two-way data
In low-band systems, due to the low operating frequency of the system, I\Q imbalance is not serious; however, direct conversion receiver...

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[0048] The method of the present invention has been introduced in detail in the content of the present invention, and the actual effect of the present invention will be supplemented below with reference to the accompanying drawings.

[0049] Such as figure 1 and figure 2 As shown, the method of the present invention is to set a compensator module between the channel estimation and equalization modules, and use the polyphase Gray sequence autocorrelation and conjugate autocorrelation characteristics to separate the original signal component and the conjugate component in the received signal in the time domain , and estimate the corresponding equivalent channel, then calculate the compensation filter through the equivalent channel, and finally use the compensation filter to compensate I\Q imbalance.

[0050] Such as image 3 and Figure 4 As shown, the binary symbols are mapped to quadrature amplitude modulation (QAM) symbols by the sending end, the order is 16, the transmis...

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Abstract

The invention belongs to the technical field of wireless communication and specifically relates to a single carrier system IQ (In-phase\Quadrature) imbalance compensation method based on a Golay sequence. The method provided by the invention is the method for finishing estimation in a time domain through autocorrelation of the Golay sequence and compensating the I\Q imbalance. The single carrier system IQ imbalance compensation method based on the Golay sequence comprises the steps of separating and estimating an original signal component and a conjugate component of a received signal; estimating equivalent channel information; estimating a compensation filter coefficient; and compensating the I\Q imbalance. According to the method, on the premise of not losing accuracy, when a sequence length reaches 256 symbols, the performance difference between the compensation performance and an ideal system is reduced to 0.2dB.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a compensation method for IQ imbalance of a single carrier system based on Golay sequences. Background technique [0002] With the development of communication, people have higher and higher requirements for communication, which makes spectrum resources more and more scarce. 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 device needs to support multiple network types, such as mobile cellular systems, fixed wireless local area networks, and short-distance wireless local area networks. and positioning and navigation systems. This means that the transceiver equipment of the user terminal needs to be flexible to adapt to systems of different networks and different frequency bands. However, while realizing high-band ...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0202H04L25/03159H04L25/03878
Inventor 徐小珂岳光荣陈雷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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