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An iterative hybrid precoding method based on hierarchical design in a millimeter wave MIMO system
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A precoding and millimeter wave technology, applied in the field of iterative hybrid precoding, can solve problems such as system performance loss
Active Publication Date: 2019-05-03
BEIJING UNIV OF POSTS & TELECOMM
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The algorithm assumes that the digital precoding matrix is a diagonal matrix and only provides power allocation, so it will lead to a certain system performance loss
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Embodiment 1
[0057] Embodiment 1: Firstly, the application principle of millimeter wave hybrid precoding design is described for narrowband channels.
[0058] In order to solve the problem of hybrid precoding in millimeter-wave MIMO systems, we designed an iterative hybrid precoding method based on layered design. The flow chart of this implementation case is shown in figure 2 shown. Include the following steps:
[0059] Step 1. Establish the hybrid precoding problem model of the millimeter wave system;
[0060] Step 2. Introduce the idea of layered design to design the digital-analog hybrid precoding;
[0061] Step 3. Assuming that the optimal analog precoding is known, design digital precoding to further improve the spectral efficiency of the system;
[0062] Step 4. Propose the design strategy of iterative solution, and deduce the approximate optimal solution closed-form solution of analog precoding;
[0063] Step 5. Outputting the optimal digital precoding and analog precoding m...
Embodiment 2
[0101] Embodiment 2: In the case of a broadband channel, the application principle of the above-mentioned millimeter-wave hybrid precoding design scheme is further described. The specific steps are the same as in Embodiment 1.
[0102] Step 1, establish a millimeter-wave hybrid precoding problem model based on the broadband channel model, and its objective function is:
[0103]
[0104]
[0105]
[0106] In the formula, Indicates the transmission rate on the kth carrier.
[0107] Step 2: Introduce the idea of layered design, and design based on wideband channel hybrid precoding. Specifically, the digital precoding is designed on the assumption that the analog precoding is known. Secondly, based on the obtained digital precoding, an analog precoding matrix is designed.
[0108] Step 3, assuming that the analog precoding is known, the digital precoding is designed to improve the spectral efficiency of the system, then the design of the digital precoding can be ex...
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Abstract
The invention discloses an iterative hybridprecoding method based on hierarchical design in a millimeter wave MIMOsystem. The millimeter wave hybridprecoding method comprises the following steps: step a, establishing a hybridprecoding problem model of a millimeter wave system; B, introducing the idea of hierarchical design, and designing the digital-analog hybrid precoding; C, assuming known optimal analog precoding, and designing digital precoding to further improve the spectral efficiency of the system; D, proposing a design strategy of iterative solution, and deriving an optimal solution closed-form solution of the analog precoding; And e, outputting an optimal digital precoding matrix and an optimal analog precoding matrix. In a millimeter wave MIMO system, the invention provides an iterative hybrid precoding method based on hierarchical design, so as to realize the system performance which can be close to that of unconstrained digital precoding.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to an iterative hybrid precoding method based on layered design in millimeter wave MIMO. Background technique [0002] With the continuous improvement of mobile smart terminals and the rapid development of the mobile Internet, people's demand for wireless network capacity is increasing day by day. In order to meet people's needs for the mobile Internet and its business environment, the next generation of mobile communication technology (5G) will be committed to building a ubiquitous, all-round information ecosystem that is connected to everything, and promote the development of social and economic entities in an intelligent way. Transformation to improve the country's productivity and sustainable development. Compared with the previous generation of mobile communication systems (4G), 5G needs to be applicable to more scenarios and provide users with a more extreme experience. ...
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