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A method and device for estimating and compensating for IQ imbalance at the receiving end of an sc-fde system

A technology of SC-FDE and compensation method, which is applied in the direction of baseband system, transmission system, digital transmission system, etc., and can solve problems such as limiting data rate and performance degradation

Active Publication Date: 2020-10-02
SOUTHEAST UNIV
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  • Claims
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Problems solved by technology

The resulting distortions can cause drastic performance degradation and limit achievable data rates, so these impairments should be adequately compensated

Method used

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  • A method and device for estimating and compensating for IQ imbalance at the receiving end of an sc-fde system
  • A method and device for estimating and compensating for IQ imbalance at the receiving end of an sc-fde system
  • A method and device for estimating and compensating for IQ imbalance at the receiving end of an sc-fde system

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0052] Such as figure 1 As shown, in the SC-FDE system, after the data is modulated at the transmitting end, the data is divided into the number of streams corresponding to the number of transmitting antennas through stream analysis. The data block is added with CP, and the data is sent out through the radio frequency end, and the data sent on the i-th antenna is s i (k,t).

[0053] Regardless of the IQ imbalance parameters at the transmitting end, after being interfered by the wireless channel and additive noise, the signal of the jth receiving antenna is

[0054]

[0055] Where k represents the kth data block, and t represents the tth data symbol. h ji Indicates the fading coefficient of the j-th receiving antenna to the i-th transmitting antenna, v j is the additive noise of the jth receiving antenna, Represents signal convolution.

[0...

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Abstract

The invention discloses a receiving end IQ imbalance estimation and compensation method and device for an SC-FDE system, and the stream analysis of modulated data is performed at a transmitting end. CP is added to a data block, and the data block is received by a receiving end through a wireless channel and noise interference. The received signal introduces IQ imbalance because of the hardware damage of a radio frequency end. The method provided by the invention comprises the steps: carrying out the FFT of time domain data to a frequency domain after the CP of data is removed at the receivingend; estimating the channel information in advance through pilot frequency data, and obtaining an IQ imbalance parameter estimated value; carrying out the mirroring of the received signal afterwards,carrying out the merging, and estimating the frequency domain data of an original signal through LS; and finally restoring the original data through IFFT and demodulation. According to the method provided by the invention, the pilot frequency data is used in the frequency domain for the separated estimation of the IQ imbalance parameter and channel in advance, and then a simple LS method is used for compensating for the IQ imbalance and channel interference. Moreover, the method can be suitable for SISO and MIMO systems.

Description

technical field [0001] The invention relates to a receiving end IQ imbalance estimation and compensation method and device of an SC-FDE system, belonging to the technical field of wireless communication systems. Background technique [0002] Down-conversion is a fundamental stage in all RF front-end architectures, and direct-conversion receivers offer a good implementation compared to traditional superheterodyne front-end architectures. However, such a low-cost front-end can be very sensitive to analog component imperfections, mainly RF impairments due to manufacturing inhomogeneities, such as IQ imbalance, carrier frequency offset, phase noise, etc. Among them, IQ imbalance is divided into frequency independent (FI) and frequency dependent (FD). The FI imbalance is mainly caused by the non-ideality of the local oscillator (LO), which remains constant within the signal bandwidth. Ideally, the LO should produce I and Q branches with the same gain and 90° phase offset, howeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/0228H04L25/03159H04L25/03891
Inventor 黄永明徐家辉高强范特
Owner SOUTHEAST UNIV