Electric power distribution and QR-OSIC precoding method based on MIMO-VLC system

Abstract

The invention discloses an electric power distribution and QR-OSIC precoding method based on an MIMO-VLC system, and belongs to the field of wireless communication. The method specifically comprises the following steps: firstly, constructing an MIMO-VLC system model, transmitting a signal by a base station at a transmitting end, enabling the signal to reach PD at a receiving end through an optical channel, constructing a direct link channel gain matrix H, obtaining a pre-coding matrix F by adopting a QR decomposition method, and eliminating partial interference of the received signal; a receiver is detected through MMSE-OSIC, and residual interference is eliminated step by step; then, an electric power distribution optimization model with the maximum resultant rate is constructed for the interference-eliminated received signals, the non-convex electric power distribution optimization model is divided into two sub-problems, relevant parameters are solved through step-by-step iteration, the parameters are iterated in a loop mode through a CVX tool box by means of a gradient descent method till convergence, and the optimal power distribution optimization model is obtained. And the optimal value of the electric power distribution under the maximum system reachable combined rate is further obtained. According to the invention, the communication and illumination functions in the MIMO-VLC communication system are effectively considered, the multiplexing gain of the system can be effectively improved, and the bit error rate performance of the system is enhanced.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to precoding of visible light MIMO, in particular to an electric power distribution and QR-OSIC ( QR decomposition-Ordered SuccessiveInterference Cancellation, QR decomposition-Ordered Serial Interference Cancellation) precoding method. Background technique [0002] The rapid development of wireless communication technology supports the rapid popularization of various emerging application scenarios such as smart life, smart production, and smart society. Facing the future 2030+, various intelligent communication services in 6G application scenarios have enhanced requirements for indicators such as bandwidth, communication rate, channel capacity, delay, and mobility. Visible Light Communication (VLC) is an indicator to meet future high peak rates. Potential enabling technologies for demand [1] . Because the VLC uses light-emitting diodes (Light Emitting Diodes, LED) as the ligh...

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Problems solved by technology

[0011] At present, there are many challenges in the amplitude adaptive dimming control in the MIMO-VLC system: due to the nonlinear characteristics of the LED, the transmitted signal must be a non-negative real number; the high correlation of the channels of the MIMO-VLC system in the multi-LED scenario has a negative impact on the system performance. Certain influence; Compatible with communication and lighting requirements at the same time; With the increase of the number of LEDs, under the condition of spatial multiplexing, the multiplexing efficiency of the system cannot be ignored

[0012] Therefore, it is necessary to study an electric power allocation and QR-OSIC precoding method suitable for MIMO-VLC systems to solve the problem of improving the system communication rate when the channel correlation is high

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