Millimeter wave system double-end phase noise suppression method based on variational Bayesian inference

Abstract

The invention belongs to the technical field of wireless communication, and relates to a millimeter wave system double-end phase noise suppression method based on variational Bayesian inference. According to the invention, a variational Bayesian inference algorithm is adopted, and the variational Bayesian inference algorithm is an algorithm for solving posteriori distribution of an unknown randomvariable, and by continuous iteration, a mean and a variance of a hidden variable of a sample under known conditions are obtained. The millimeter wave system double-end phase noise suppression methodhas the beneficial effects that accurate data symbol estimation can be implemented under the condition that in a millimeter wave communication system, both transmitting and receiving ends have phase noise; and bit error rate performance of the system is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to phase noise suppression for a millimeter wave communication system by using a variational Bayesian inference algorithm in the presence of phase noise. Background technique [0002] In recent years, the millimeter wave wireless communication system stands out among many wireless communication transmission schemes due to its advantages such as huge license-free bandwidth, ultra-high transmission rate, strong security and anti-interference ability, and has become a hot spot in the current wireless communication field. It is possible to become one of the most important technologies in wireless communication in the future. [0003] However, mmWave communication systems still face many problems to be solved, one of which is phase noise. In the process of signal transmission, in addition to experiencing channel fading, it is also affected by nonlinear factors of radio freq...

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Problems solved by technology

However, there is a certain difference between the crystal oscillator and the phase-locked loop that generate the carrier, resulting in a short-term random difference between the carrier frequency and the target frequency, which in turn causes random phase jumps in the generated sine wave signal, which is manifested as phase noise

For the modulation method of orthogonal frequency division, the phase noise will generate common phase error and inter-carrier interference, which will seriously affect the performance of the system

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