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A Hybrid Precoding Algorithm Based on Channel Correlation Elimination

A channel-related and precoding technology, applied in electrical components, radio transmission systems, transmission systems, etc., can solve problems such as inapplicable methods, poor anti-interference performance, and limited application scenarios, reducing interference and achieving high algorithm flexibility. , the effect of low computational complexity

Active Publication Date: 2022-01-07
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

Among them, it is easy to implement the interference directly as noise processing, but when the interference signal and the useful signal are comparable in strength, the method becomes inapplicable, so the application scenarios are limited; the orthogonality scheme of the channel can combine the useful signal and the useful signal Interference signals are separated, however, when the number of users increases, the anti-interference performance of the system becomes worse

Method used

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  • A Hybrid Precoding Algorithm Based on Channel Correlation Elimination
  • A Hybrid Precoding Algorithm Based on Channel Correlation Elimination
  • A Hybrid Precoding Algorithm Based on Channel Correlation Elimination

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Experimental program
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Embodiment 1

[0152] 1. We use the S-V model to model the mmWave MIMO channel:

[0153]

[0154] in, alpha il is the complex gain of the l-th path of the i-th scattering cluster; is the angle of arrival. is the array response vector of the antenna. The base station adopts a uniform linear array, It can be expressed as:

[0155]

[0156] where λ is the wavelength of the electromagnetic wave and d is the distance between adjacent antennas in the array. Assume that the number of users K=8, and the number of paths in the space L=10.

[0157] 2. Build as figure 1 MIMO architecture shown. Let the number of transmitting antennas Nt=64; the number of receiving antennas Nr=64; the number of RF chains M=N=8.

[0158] 3. For user grouping. Because in the MIMO system, the kth user receives interference from K-1 users, and the interference strength is unknown. Therefore, the interference strength is identified through the correlation of user channel correlation vectors, and users ar...

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Abstract

The present invention relates to the technical field of massive MIMO communication, in particular to a hybrid precoding algorithm based on channel correlation cancellation, which uses a fully connected phase-shifting network for hybrid precoding, and optimizes the analog precoder to achieve anti-interference and make the frequency spectrum Maximize efficiency. The invention aims at user grouping, and obtains the simulated precoder through the ladder descent algorithm in the group, and obtains the baseband precoder through the least square method. Compared with the prior art, the present invention proposes a channel correlation elimination method, which can effectively reduce the interference between users and reduce the difficulty of the algorithm under the condition of maintaining the best spectrum efficiency. At the same time, this method is suitable for phase shifter networks with different resolutions, and the algorithm has higher flexibility.

Description

technical field [0001] The invention relates to the technical field of massive MIMO communication, in particular to a hybrid precoding algorithm based on channel correlation elimination. Background technique [0002] MIMO is a means to effectively improve spectrum efficiency in modern communication technology. However, when there are multiple users in the downlink, the influence of channel correlation between users cannot be ignored. When the channel correlation between users is strong, the hybrid precoding scheme has performance defects. The commonly used anti-interference method is to treat the interference as noise or use the orthogonality of the channel. Among them, it is easy to implement the interference directly as noise processing, but when the interference signal and the useful signal are comparable in strength, the method becomes inapplicable, so the application scenarios are limited; the orthogonality scheme of the channel can combine the useful signal and the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/0452
CPCH04B7/0456H04B7/0452
Inventor 程知群李金萌李航
Owner HANGZHOU DIANZI UNIV