Downlink beam forming method and device of VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system

A technology of beamforming and beamforming matrix, which is applied in the field of visible light communication, can solve the problems of real-time and accuracy of downlink signal transmission, etc.

Active Publication Date: 2016-06-29
SOUTHEAST UNIV
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Problems solved by technology

The existing downlink beamforming matrix is ​​usually obtained by optimizing and solving the beamforming matrix optimization model. On the one hand, whether the design of the beamforming matrix optimization model is reasonable or not directly determines the downlink signal transmission parameters such as achievable rate, power consumption, and Qos; On the other hand, as the design of the beamforming matrix optimization model becomes more and more complex and involves more and more parameters, higher requirements are placed on the optimization solution algorithm. The insufficient design of the optimization solution algorithm will affect the real-time performance of downlink signal transmission. and accuracy, and place higher demands on the system hardware

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  • Downlink beam forming method and device of VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system
  • Downlink beam forming method and device of VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system
  • Downlink beam forming method and device of VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system

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Embodiment Construction

[0051] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0052] Aiming at the downlink beamforming problem of the VLCMU-MISO system, the present invention proposes a new method, which utilizes a double-layer iterative optimization solution method to optimize the solution of the beamforming matrix optimization model, thereby reducing the requirements for hardware resources in the optimization calculation process; A beamforming matrix optimization model with the maximization of the attainable rate as the optimization goal is further proposed, which greatly improves the reachable rate of the downlink of the system.

[0053] figure 1 Shows the basic flow of the downlink beamforming matrix acquisition process using the technical solution of the present invention, such as figure 1 As shown, it specifically includes the following steps:

[0054] Step 1. Establish a beamforming matrix optimization model:

[0055] ...

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Abstract

The invention discloses a downlink beam forming method of a VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system, and belongs to the technical field of visible light communication. According to the method, firstly, the optimization solution is carried out on a beam shaping matrix optimization model by a bi-level iterative method, thus obtaining an optimized beam shaping matrix; and then carrying out downlink beam forming according to the beam shaping matrix. The invention also provides a beam shaping matrix optimization model taking a maximum reachable rate as an optimization target. The invention also discloses a downlink beam forming device of the VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system and the VLC (Visible Light Communication) MU-MISO (Multiple Users-Multiple Input-Single Output) system. Compared with the prior art, the method, the device and the system have the advantages of low hardware demand and the reachable rate of the system can be further improved.

Description

technical field [0001] The present invention relates to the technical field of visible light communication (VisibleLightCommunication, VLC), and in particular to a VLCMU-MISO (MultipleUsers-MultipleInput-SingleOutput, multi-input-single-output for multiple users) system downlink beamforming method and device. Background technique [0002] Visible light communication (VLC) is a new type of communication method that does not need to use wired channels as the transmission medium. It combines the advantages of optical fiber communication and microwave communication. Therefore, countries have invested a lot of manpower and material resources in the field of visible light communication, and achieved phased results. [0003] Multiple Input Multiple Output (MIMO) technology is a core transmission technology in modern wireless radio frequency communication systems. MIMO technology configures multiple antennas on the transmitter and receiver, and uses the uncorrelation between channe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06H04B10/116
CPCH04B7/0408H04B7/0617H04B10/116
Inventor 沈弘邓榆钦赵春明
Owner SOUTHEAST UNIV
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