A dco-ofdm system DC bias setting method suitable for visible light communication
A visible light communication and DC bias technology, applied in the field of visible light communication, can solve the problems of not considering the influence of the DC bias of the encoder, reducing the power utilization rate, and high bit error rate, so as to expand the brightness adjustment range and improve the power utilization rate. , to achieve the effect of low complexity
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[0033] The present invention will be further described below in conjunction with the accompanying drawings.
[0034] Due to the addition of DC bias B in the DCO-OFDM system DC The reason is to make the time domain signal satisfy the positive reality, after adding B DC after the negative portion of the signal is clipped, resulting in the same B DC related clipping noisen C (B DC ), leading to a decrease in the reliability of the visible light communication system. In the general DCO-OFDM system, B DC The design principle is that the DC bias should be as small as possible under a certain bit error rate performance requirement, and the power utilization rate should be as high as possible. The ratio of the size of the clipped part signal to the negative signal of the original signal is defined as the clipping ratio η. In general systems, η= 1%. The DCO-OFDM system DC bias setting method suitable for visible light communication proposed by the present invention is to increase ...
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