Precoding and equalization joint optimization method based on rate matching

A technology of rate matching and joint optimization, applied in the field of visible light communication, which can solve the problems of system performance degradation and waste of system spectrum resources.
CN112583485AActive Publication Date: 2021-03-30SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2021-03-30

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Abstract

The invention discloses a precoding and equalization joint optimization method based on rate matching, which comprises the following steps: establishing a mean square error minimization model, iteratively solving the optimization model through a step-by-step iterative method, splitting the optimization model in the iterative process, firstly solving the optimal data stream number of each user, andthen solving the optimal data stream number of each user; fixing an equalization matrix solving and coding matrix, then taking the precoding matrix as a known quantity to solve the equalization matrix, then iteratively solving the precoding matrix and the equalization matrix, and terminating iteration when a convergence condition is met. According to the method, the number of the user data streams and the precoding and equalization matrix are adaptively selected according to the channel state information (CSI) of different users in the multi-user multi-input multi-output MIMO VLC system, so that the system bit error rate in the same type of scheme is effectively reduced. The system performance is improved.
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Description

technical field

[0001] The invention relates to a rate-matching-based joint optimization method for precoding and equalization, and belongs to the technical field of visible light communication. Background technique

[0002] Visible light communication (VLC) is a communication technology that transmits data by modulating visible light. Generally, light-emitting diodes (LEDs) are used to send data, and photodiodes (PDs) are used to receive data. But the bandwidth of LED is very narrow, which limits the data transmission rate, so MIMO technology is introduced in VLC. The introduction of MIMO technology improves the spectral efficiency of the system, but also brings interference between channels. At the same time, if there are multiple users in the system, serious inter-user interference will also be brought about. When the interval between LEDs or PDs is close enough, or the distance between users is close enough, interference between users will be significant. In order to...

Claims

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