Mobility visible light communication channel equalization method
A technology for visible light communication and channel equalization, applied in the field of visible light communication, can solve the problems of long OFDM signal symbol length, reducing the effect of channel equalization, and inability to reflect, and achieve the effect of simplifying the estimation process, accurate estimation effect and equalization effect.
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[0032] The present invention will be further explained below in conjunction with the accompanying drawings.
[0033] Such as figure 1 As shown, the OFDM multipath signal caused by multiple light sources and reflections is received by the mobile receiver terminal at a moving speed of v, resulting in multipath effects and intersymbol interference, which degrades the system transmission performance.
[0034] Such as figure 2 and image 3 As shown, assuming that the length of the observation interval is L, through decision feedback, the received value of each subcarrier of the previous L OFDM symbols and its decision value can be effectively used to estimate the channel of each subcarrier of the currently received OFDM symbol, and then with The decision results of the M-length training sequence are combined in a weighted form and further equalized. Assuming that the i-th OFDM symbol is currently received, and i is any value, it is demodulated, assuming that the length of the o...
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