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Hybrid precoding method based on past algorithm in millimeter-wave massive mimo system

A large-scale, millimeter-wave technology, applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problems of low complexity and high matrix complexity, achieve simplified complexity, good universality, and meet real-time processing requirements Effect

Active Publication Date: 2022-07-15
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology, to provide a hybrid precoding method based on the PAST algorithm in a millimeter-wave massive MIMO system, to estimate the optimal unconstrained hybrid precoding method through the PAST algorithm, and to maximize the system's attainable rate. It has low complexity, solves the technical problem of using SVD to calculate the optimal unconstrained hybrid precoding matrix with high complexity in the HC system architecture, and realizes the invention goal of obtaining almost the same performance as the SVD-based hybrid precoding algorithm in the HC system , and with the increase in the number of transmit antennas, the complexity and time consumption are much lower than that of the invention based on the SVD hybrid precoding algorithm

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  • Hybrid precoding method based on past algorithm in millimeter-wave massive mimo system
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  • Hybrid precoding method based on past algorithm in millimeter-wave massive mimo system

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[0050] The technical solutions of the invention will be described in detail below with reference to the accompanying drawings.

[0051] The total achievable rate is simplified, decomposed into a series of sub-rate optimization problems, and each sub-rate is maximized in turn using the SIC idea. The optimal unconstrained hybrid precoding of each sub-array is estimated by the PAST algorithm, and the constrained hybrid precoding matrix is ​​calculated according to the estimated result.

[0052] like figure 1 As shown, in the hybrid precoding system of the HC structure, the transmitter is equipped with N t root antenna and N RF The root RF chain divides the antenna and RF chain at the transmitting end into D sub-arrays, and each sub-array has K(N RF / D) The root RF chain is connected to T(N through a phase shifter t / D) root antenna and connections. N s data stream in digital precoder After precoding through the RF chain, then emulate the precoder Perform analog precodin...

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Abstract

The invention discloses a hybrid precoding method based on a PAST algorithm in a millimeter-wave massive MIMO system, and belongs to the technical field of electrical communication. In the hybrid precoding of millimeter-wave massive MIMO system, the method first simplifies the total achievable rate, decomposes it into a series of sub-rate optimization problems, and uses the SIC idea to maximize each sub-rate in turn. In the optimization process of each sub-rate, the optimal unconstrained hybrid precoding of each sub-rate is estimated by the PAST algorithm, and finally the constrained hybrid precoding matrix is ​​calculated according to the estimated result. This method can obtain almost the same performance as the SVD-based hybrid precoding algorithm in the HC system structure, and with the increase of the number of transmit antennas, the complexity and time-consuming of this method are much lower than that of the SVD-based hybrid precoding algorithm. Meet the real-time processing requirements of the algorithm. At the same time, the method can be applied in three system structures of FC, SC and HC, and has good universality.

Description

technical field [0001] The invention relates to communication technology, in particular to a hybrid precoding method based on a PAST (Projection Approximation Subspace Tracking) algorithm in a millimeter-wave massive MIMO system, and belongs to the technical field of electrical communication. Background technique [0002] In the traditional MIMO system, the ideal system performance can be achieved by using the all-digital precoding structure, but if the all-digital precoding is applied in the massive MIMO system, it will lead to high energy consumption and implementation cost. Therefore, the use of hybrid precoding consisting of low-dimensional digital precoding and high-dimensional analog precoding can greatly reduce the number of RF chains and energy consumption. [0003] Generally speaking, the system structure of hybrid precoding is divided into a fully connected structure (Fully-Connected, FC) and a sub-connected structure (Sub-Connected, SC). The FC system structure c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/0413
CPCH04B7/0456H04B7/0413
Inventor 徐友云周笑蒋锐李大鹏
Owner NANJING UNIV OF POSTS & TELECOMM
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