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Double-ended phase noise suppression method of millimeter wave system based on maximum posteriori criterion

A phase noise, maximum a posteriori technology, applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., can solve problems such as inter-carrier interference, phase noise, and affect system performance, achieve accurate estimation and improve bit error rate performance effect

Active Publication Date: 2018-11-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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

Method used

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  • Double-ended phase noise suppression method of millimeter wave system based on maximum posteriori criterion
  • Double-ended phase noise suppression method of millimeter wave system based on maximum posteriori criterion
  • Double-ended phase noise suppression method of millimeter wave system based on maximum posteriori criterion

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Embodiment Construction

[0048] The present invention is described in detail below in conjunction with accompanying drawing:

[0049] S1. Calculate the common phase error of the phase noise and compensate the received signal, and roughly judge the data symbol as the initial value of the iteration;

[0050] S2. The iteration of the maximum a posteriori criterion is realized through the following steps:

[0051] S21. Calculate the mean value and variance of the posterior distribution of the phase noise expansion vector at the receiving end

[0052]

[0053] S22. Calculate the mean value and variance of the posterior distribution of the phase noise expansion vector at the transmitting end

[0054]

[0055] S23. Remember remember but available method to judge the data.

[0056] S24, loop steps S21-S23, under the condition of known received signal, the data symbol vector will converge to a stable value.

[0057] image 3 It is the system BER performance curve under different phase noise l...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a double-ended phase noise suppression method of a millimeter wave system based on a maximum posteriori criterion. The maximum posteriori criterion is adopted in the double-ended phase noise suppression method provided by the invention, and the maximum posteriori criterion is a method of a corresponding signal estimated value for figuring out a derivative of posterior probability distribution and performing continuous iteration, so that the posterior probability density is the maximal. The double-ended phasenoise suppression method provided by the invention has the beneficial effects that accurate data symbol estimation can be realized under the condition that phase noise exists at both of transmittingand receiving ends in the millimeter wave communication system, and the bit error rate performance of the system is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to suppressing the phase noise at both ends of the transmitting and receiving ends of 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,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2688H04L27/2691
Inventor 许可成先涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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