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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.

Active Publication Date: 2021-03-30
SOUTHEAST UNIV
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Problems solved by technology

Once the channel conditions of the users are very different, this scheme is no longer applicable, because for users with poor channel conditions, allocating a large number of data streams will make the system performance drop sharply, while for users with good channel conditions, allocating more The small number of data streams will cause a waste of system spectrum resources

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  • Precoding and equalization joint optimization method based on rate matching
  • Precoding and equalization joint optimization method based on rate matching
  • Precoding and equalization joint optimization method based on rate matching

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[0049] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0050] A joint optimization method of precoding and equalization based on rate matching. Firstly, the mean square error minimization model is established, and then the optimization model is iteratively solved by a step-by-step iterative method. In the iterative process, the optimization model is first split, first Solve the optimal number of data streams for each user, then fix the equalization matrix and encoding matrix, then use the precoding matrix as a known quant...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/50H04B10/516H04B10/69H04B7/0452H04B7/0456
CPCH04B7/0452H04B7/0456H04B10/116H04B10/502H04B10/516H04B10/6971
Inventor 蒋良成张庆贺陈明肖仁良
Owner SOUTHEAST UNIV
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