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

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 ...

AI Technical Summary

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 receivers are widely used in high-band systems, especially in systems using high-order modulation, I\Q imbalance becomes an important factor limiting receiver performance

On the other hand, the responses of the two branches of I\Q should be completely consistent under ideal conditions. However, due to the increase in the bandwidth of the high-frequency band system, it is difficult to achieve the same frequency response of the two branches of I\Q, which leads to I\Q Another source of Q imbalance

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