A Method of Precoding Constellation Points for Selecting Odd Order Quadrature Amplitude Modulation Signals

Abstract

The invention discloses a method for selecting a precoded constellation point of an odd-order quadrature amplitude modulation signal, which comprises the following steps: setting the bias current and the peak-to-peak value of the signal strength; selecting the precoded constellation point as a conventional constellation point, modulating, receiving and recording The first transmission signal; according to the recorded first transmission signal, demodulate the first transmission signal and obtain the first bit error rate; select the precoding constellation point as the full Gray constellation point, modulate, receive and record the second transmission signal; according to The recorded second transmission signal, demodulating the second transmission signal and obtaining the second bit error rate; calculating the bit error correction matrix according to the obtained first bit error rate and the second bit error rate; according to the set bias The current and signal strength peak-to-peak value and the standard error difference formula are calculated to obtain the standard error difference matrix; the model is established according to the bit error correction matrix and the standard error difference matrix, and the peak-to-peak value of the bias current and signal strength according to the model and settings Appropriate precoding constellation points are obtained.

Description

technical field [0001] The disclosure of the present invention relates to the communication field, in particular to a method for selecting precoded constellation points of an odd-order quadrature amplitude modulation signal. Background technique [0002] Visible Light Communication (VLC) technology refers to a communication method that uses light in the visible light band as a carrier to directly transmit optical signals through the air without the need for optical fiber lights and wired media. Visible light communication can be realized based on commercial LEDs, which can be used for high-speed communication as well as lighting. As an emerging wireless communication method, visible light communication has the advantages of no electromagnetic interference, rich spectrum resources without registration, low cost and high confidentiality. With the large-scale popularization of commercial LEDs, visible light communication will play an important role in the future military indus...

AI Technical Summary

Problems solved by technology

However, in the existing visible light communication methods, there is no effective selection scheme according to the bias current and signal amplitude.

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