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A Hybrid Precoding Method for Millimeter-Wave Massive MIMO Systems

A large-scale, millimeter-wave technology, applied in transmission systems, radio transmission systems, advanced technologies, etc., can solve problems such as difficult to obtain hybrid precoding design solutions, and achieve overcoming spectral efficiency loss, low computational complexity, and high energy consumption problem effect

Active Publication Date: 2021-12-14
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Since the analog precoding is implemented by a phase shifter, the elements of the analog precoding matrix are constrained by a constant modulus, which leads to a non-convex problem in finding the precoding matrix to maximize spectral efficiency, and it is difficult to obtain an optimal hybrid precoding design scheme

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  • A Hybrid Precoding Method for Millimeter-Wave Massive MIMO Systems
  • A Hybrid Precoding Method for Millimeter-Wave Massive MIMO Systems
  • A Hybrid Precoding Method for Millimeter-Wave Massive MIMO Systems

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Embodiment Construction

[0050] The method of the present invention is aimed at the millimeter-wave large-scale MIMO full-connection hybrid architecture, adopts a narrow-band clustering channel model, and the sending end and the receiving end are equipped with uniform planar array (Uniform PlanarArray, UPA) antennas, and the antenna spacing is set to half a wavelength, assuming that the angle of arrival and the azimuth and elevation angles of the departure angle obey 0,2p and The uniform distribution of , the angular extension of both the transmitter and the receiver is 7.5 degrees, assuming that all streams are equal power distribution, the simulation results are the average of the simulation results generated by 200 random channels. The number of iterations is 5, and the system block diagram is as follows figure 1 As shown, the focus of the present invention is the design of the analog and digital precoding matrix at the transmitting end, and the method of the present invention is also applicable t...

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Abstract

The invention discloses a hybrid precoding method for a millimeter-wave massive MIMO system. The steps include: 1. Channel modeling, determining the channel matrix H, and performing singular value decomposition on the channel matrix to obtain optimal unconstrained full digital precoding Matrix, 2. Construct the simulated precoding vector by alternate iteration method, 3. Update the residual matrix F in a way similar to matching pursuit res , 4. Calculating the digital precoding matrix by the least square method and performing normalization processing. 5. Obtaining the analog combination matrix and the digital combination matrix at the receiving end through the same steps. The present invention can obtain better spectrum efficiency close to the full digital precoding method with relatively low computational complexity, thus can obtain channel capacity close to the full digital precoding method, and greatly save energy consumption of the radio frequency chain.

Description

technical field [0001] The invention belongs to the technical field of information and communication engineering, and in particular relates to a millimeter-wave large-scale multiple input multiple output (Multiple Input Multiple Output, MIMO) system hybrid precoding. Background technique [0002] Today's wireless communication system's explosive demand for capacity has made traditional spectrum resources increasingly tight. Millimeter waves can provide abundant frequency band resources and gigabit data rates, and are considered to be the key technology of 5G (5th-Generation). However, the signal propagation of mmWave signals suffers from higher free-space path loss due to the 10-fold increase in frequency compared to current wireless communication systems. Fortunately, the reduction in wavelength enables smaller antenna sizes, allowing a large number of antennas to be packed in the same space. Large arrays enable beamforming gain to compensate for path loss. Furthermore, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0456H04B7/0465Y02D30/70
Inventor 周武旸王发致柴名扬朱超逸
Owner UNIV OF SCI & TECH OF CHINA
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