A Novel Superimposed 64QAM Constellation Design Scheme
In order to improve the transmission rate of visible light communication systems and overcome channel correlation,a superimposed 64 order orthogonal amplitude modulation constellation scheme is proposed in a 2×2 multi input multi output visible light communication sys-tem.Firstly,generate two geometrically integer 8QAM signals at the transmitting end and send them through two light-emitting diodes;Then,a square 64QAM constellation signal is obtained by linearly superimposing the free space transmission to the receiving end.Experiments have shown that the proposed scheme has a lower bit error rate,a wider range of peak to peak voltage operation,and a larger minimum Euclidean distance and lower peak to average power ratio compared to existing schemes.Therefore,it has stronger noise resistance and can effectively re-duce the risk of nonlinear distortion in the transmitting LED.Both theoretical simulations and experiments have proven its superiority.
visible light communicationmultiple-input multiple-output64QAMsuperimposed constellationwireless communication
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