Carrier synchronization method and device based on 5G high-order modulation signal clustering discrimination

Abstract

The invention provides a carrier synchronization method and device based on 5G high-order modulation signal clustering discrimination. The method comprises the following steps: setting a 5G communication signal basic parameter; generating two paths of baseband IQ orthogonal signals xI(t) and xQ(t) with frequency phase offset under set parameters based on MATLAB; based on a clustering discrimination method, discriminating two paths of input IQ orthogonal signals in sequence; performing frequency phase offset correction on the discriminated signals through a frequency-locked / phase-locked loop to obtain signals xIC(t) and xQC(t); and sampling and judging the xIC(t) and the xQC(t), and calculating the bit error rate BER. Based on a frequency-locked loop (FLL) and a phase-locked loop (PLL) of a clustering discrimination method, the frequency offset and the phase offset of a 5G high-order modulation baseband signal data set are corrected, the constellation diagrams of baseband signals before and after correction are compared, carrier synchronization is achieved, on the premise that certain precision is guaranteed, the calculation efficiency of carrier synchronization in 5G high-order modulation signals is improved, and engineering application is accelerated.

Description

technical field [0001] The invention belongs to the field of signal technology, and in particular relates to a carrier synchronization method and device based on clustering discrimination of 5G high-order modulation signals. Background technique [0002] Carrier synchronization has become a hot topic in the field of signal processing. In digital communication systems, accurate carrier frequency and phase estimation of received signals is a very classic topic in carrier synchronization technology. Due to the inconsistency between the carrier at the receiving end and the carrier at the sending end due to the fast fading in the channel, the center frequency of the signal is shifted, resulting in a frequency offset. In addition, the signal transmitted in the channel will also be affected by the Doppler effect, which will cause the signal to have phase jitter, and then produce phase deviation. The frequency deviation and phase deviation generated in the process of signal transmi...

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Problems solved by technology

[0006] The above domestic and foreign researchers have used different algorithms to achieve carrier synchronization. However, in the 5G communication scenario, the information transmission rate has reached the Gbit / s level. At such a high transmission rate, although the above algorithm will improve the accuracy, the algorithm High complexity, heavy calculation, cannot be implemented in hardware

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