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Massive MIMO hybrid precoding codebook design method

A design method and large-scale technology, applied in the field of communication, can solve the problems of high cost of radio frequency components, high power consumption, poor flexibility of radio frequency analog precoding signal processing, etc.

Active Publication Date: 2018-12-04
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] Each antenna element of traditional digital precoding requires a radio frequency link. The high cost and high power consumption of radio frequency components make it unsuitable for large-scale antenna arrays
In addition, limited by the implementation complexity, the flexibility of radio frequency analog precoding signal processing is worse than that of the digital domain, so part of the precoding function of the massive MIMO system is transferred to the digital domain, and the other part is kept in the analog domain, thus forming a digital Analog hybrid processing structure will become the development trend of array precoding technology

Method used

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  • Massive MIMO hybrid precoding codebook design method
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Embodiment Construction

[0088] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0089] (1) Partial connection codebook design

[0090] figure 2 For the flow chart of the present invention, the specific implementation of part of the connection codebook design is carried out sequentially according to the following steps:

[0091] 1. Codebook initialization: V RF Referring to formula (1) initialization, here Here I a×b Represents a matrix with dimensions a×b all 1s.

[0092] 2. Channel estimator: Obtain channel estimation H, and perform SVD decomposition to obtain right unitary matrix element V.

[0093] 3. Analog codebook generator:

[0094] a) The input is the right unitary matrix V and the initial digital codebook V D , to obtain the simulated precoding codebook element b(i * ,k * ): Refer to formula (5)m(i * , j) to get the constant term e(i * , j), refer to formula (7) to get the constant term g.

[009...

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Abstract

The invention relates to a massive MIMO hybrid precoding codebook design method, and belongs to the technical field of communication. In the method, the idea of designing a partially connected codebook generator is to optimize a hybrid precoding matrix to approximate a right unitary matrix of a channel matrix. The specific design criterion is to minimize an error function, wherein the error function is defined as the inner product of the difference between the product of an analog codebook matrix and a digital codebook matrix and the right unitary matrix of the channel matrix. A channel estimator is used for estimating the channel matrix and performing SVD (Singular Value Decomposition) on the channel matrix to obtain the right unitary matrix. The idea provided by the invention of designing a fully connected codebook generator is to utilize the orthogonality and a constant modulus property of a Fourier transform base, wherein the Fourier transform base is enabled to serve as a fully connected analog codebook, and a matrix formed by performing inverse Fourier transform on a column vector of the right unitary matrix is enabled to serve as a fully-connected digital codebook.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a large-scale MIMO hybrid precoding codebook design method. Background technique [0002] Massive MIMO-based wireless transmission technology can deeply utilize wireless resources in the spatial dimension, thereby significantly improving system spectrum efficiency and energy efficiency, and has become one of the current research hotspots in academia and industry. [0003] Each antenna array element of traditional digital precoding requires a radio frequency link. The high cost and high power consumption of radio frequency components make it unsuitable for large-scale antenna arrays. In addition, limited by the implementation complexity, the flexibility of radio frequency analog precoding signal processing is worse than that of the digital domain, so part of the precoding function of the massive MIMO system is transferred to the digital domain, and the other part is kept in th...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/0413
CPCH04B7/0413H04B7/0456H04B7/0482
Inventor 何云申敏翁明江郑焕平吴广富陈吕洋
Owner CHONGQING UNIV OF POSTS & TELECOMM