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Method for estimating data of uplink of large-scale MIMO system with phase noise

A phase noise and link data technology, applied in baseband systems, baseband system components, transmission systems, etc., can solve problems affecting system performance, phase noise, sine wave signal jumps, etc.

Active Publication Date: 2018-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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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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  • Method for estimating data of uplink of large-scale MIMO system with phase noise
  • Method for estimating data of uplink of large-scale MIMO system with phase noise
  • Method for estimating data of uplink of large-scale MIMO system with phase noise

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Embodiment Construction

[0055] The present invention is described in detail below in conjunction with accompanying drawing:

[0056] S1. In the initial stage, calculate the common phase error of the phase noise, perform ZF combination on the received signals on each antenna after compensation, and obtain the initial value of the data symbol

[0057] S2. The iteration of the variational Bayesian algorithm is realized through the following steps:

[0058] S21. Calculate the mean and variance of the posterior distribution of the phase noise expansion vector

[0059]

[0060]

[0061] S22. Calculate the mean and variance of the posterior distribution of the data sign vector:

[0062]

[0063]

[0064] S23, loop steps S21-S22, under the condition of known received signal, the data symbol vector will converge to a stable value.

[0065] image 3 is the bit error rate performance curve under different antenna grouping conditions. In the simulation, the modulation method is 64QAM, the channel ...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a method for estimating data of an uplink of a large-scale MIMO system with phase noise. The method adopts a variational Bayesian inference algorithm, the variational Bayesian inference algorithm is an algorithm for solving the posteriori distribution of unknown random variables, and a mean value and a varianceof hidden variables under the known conditions of a sample are obtained through continuous iteration. The method has the beneficial effects that data symbol estimation of the uplink of the large-scaleMIMO system can be realized under the condition that the phase noise exists, 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 performing data estimation and demodulation on the uplink of a massive MIMO system by using a variational Bayesian inference algorithm in the presence of phase noise. Background technique [0002] In modern wireless communication systems, massive MIMO systems are widely considered to be the core technology of next-generation mobile communication due to their high spectral efficiency and energy efficiency. Usually, a base station has hundreds of antennas that can simultaneously Serve dozens of users under certain conditions, thereby significantly improving spectrum efficiency. As the number of base station antennas increases, the antenna gain of massive MIMO can significantly reduce the power of each user's transmitted signal, thereby improving energy efficiency. [0003] However, massive MIMO systems still face many problems to be solved, one of which is phase noise...

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Application Information

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IPC IPC(8): H04B7/0452H04B7/08H04L25/03H04L27/36H04L5/00H04L27/38
CPCH04B7/0452H04B7/0851H04L5/0025H04L5/0048H04L25/0391H04L27/362H04L27/38
Inventor 许可成先涛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA