A signal judgment method against IQ unbalanced distortion for short-distance wireless communication

Abstract

The invention discloses a signal judgment method for short-distance wireless communication against IQ unbalanced distortion, which includes the following steps: S1: calculate cluster centroid based on grid; S2: calculate signal point and each cluster respectively The Euclidean distance of the class centroid, select the cluster number corresponding to the shortest distance for each signal point; S3: average the signal points of each cluster, and calculate the cluster centroid used in the next iteration; S4: Calculate the new centroid The sum of the squares of the difference with the original centroid, and judge whether the iteration is over, if it is necessary to continue the iteration, return to step S2. The invention simplifies the structure of the transmitter in the short-distance wireless communication system. The transmitter does not need to perform pre-distortion or correct and compensate IQ imbalance distortion, simplifies the circuit and structure of the wireless transmission module, and can reduce the wireless transmission rate while ensuring the communication rate. The size and power consumption of the sensing node; the improved grid K-means clustering algorithm is used for the clustering judgment of the receiver signal, the number of iterations is small, and the algorithm can converge quickly.

Description

technical field [0001] The invention relates to the technical field of short-distance wireless communication, in particular to a signal judgment method for resisting IQ unbalanced distortion for short-distance wireless communication. Background technique [0002] The rapid development of wireless communication has brought a huge impact on people's life. The extensive research and application of wireless sensor network (WSN) and wireless body area network (WBAN) based on short-distance wireless communication is greatly promoting Changes in social life and changes in industrial technology. In wireless sensor networks and wireless body area networks, sensor nodes have the characteristics of small size, limited computing power, and limited power supply energy. In order to effectively prolong battery life and avoid frequent battery replacement, wireless sensor nodes have a strict requirements. [0003] With the advancement of integrated circuit technology, the power consumption...

AI Technical Summary

Problems solved by technology

[0007] Taking the quadrature modulator as an example, there is usually a certain difference in the gain of the two signals input to the quadrature modulator, which causes gain imbalance and distortion; the quadrature modulator requires two completely orthogonal carrier signals, However, when the carrier signal separator separates the local oscillator signal into two carrier signals with a phase difference of 90 degrees, it is almost impossible to achieve a completely accurate 90 degrees in the actual hardware circuit. The phase error is phase imbalance distortion; There is also carrier leakage in the AC modulator, and the local oscillator signal will leak to the RF output, resulting in DC offset errors

Similar to the principle of IQ distortion generated by the quadrature modulator, the quadrature demodulator also has IQ imbalance distortion

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