Hybrid precoding design method for wideband large-scale MIMO system

A design method and precoding technology, applied in the field of communication, to achieve the effect of improving the signal-to-interference-noise ratio, reducing the hardware loss, and improving the transmission rate performance

Inactive Publication Date: 2019-03-08
SOUTHEAST UNIV
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  • Hybrid precoding design method for wideband large-scale MIMO system
  • Hybrid precoding design method for wideband large-scale MIMO system
  • Hybrid precoding design method for wideband large-scale MIMO system

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[0040] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0041] In a massive MIMO system, consider that the base station has M antennas and U RF chains, uses K subcarriers to transmit messages to U users, and each user uses a single antenna to receive messages. The inventive method mainly includes the following steps: firstly initialize the analog precoding matrix and obtain its vector form through matrix straightening operation; then update the analog precoding using the conjugate gradient method based on the Riemannian manifold; then update the digital precoding according to the minimum mean square error criterion ; Finally iterate the above steps to update the analog and digital precoding respectively until the itera...

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Abstract

The invention provides a hybrid precoding design method for a wideband large-scale MIMO system. The method comprises the following steps: a simulation precoding matrix is initialized, and a vector form of the simulation precoding matrix is obtained by means of a matrix straightening operation; simulation precoding is updated by means of a Riemann manifold-based conjugate gradient method; digital precoding is updated according to a least-mean-square-error criterion; and the above steps are iterated to update simulation precoding and digital precoding until the iterative computing process is convergent. According to the method, frequency-flat simulation precoding is designed for a frequency selective channel, signal to interference plus noise ratios of various users in an actual system can be effectively increased, the transmission rate performance of the actual system can be improved, and compared with traditional pure digital precoding, the performance approximate to pure digital precoding is obtained with less hardware loss.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a precoding design method in a multi-antenna system, in particular to a hybrid precoding design method in a broadband large-scale multiple-input multiple-output (MIMO) system. Background technique [0002] In wireless communication, a broadband system can provide high-speed wireless network access in a wide area. Orthogonal frequency division multiplexing (OFDM) technology can divide the broadband into multiple subcarriers, and divide the pure digital precoding design of the broadband system into the narrowband pure digital precoding design of multiple subcarriers. On the other hand, by performing proper precoding processing on signals, MIMO spatially multiplexes existing time and frequency resources, thereby greatly improving the use efficiency of spectrum resources and the transmission rate performance of the system. Although massive MIMO can greatly improve system perfor...

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456
Inventor 许威杜劲波赵春明
Owner SOUTHEAST UNIV
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