LED visible light communication system based on OFDM
A visible light communication and LED driving technology, applied in the field of visible light communication, can solve the problems of weak anti-interference ability and low communication rate of visible light communication system, and achieve the effect of improving anti-interference ability, expanding response bandwidth and flexible networking
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[0013] Specific implementation mode 1: Combination figure 1 Detailed description of this embodiment, the OFDM-based LED visible light communication system in this embodiment includes: an amplifier circuit 1, an LED drive circuit 4, an LED array 5, an optical filter 6, and it also includes a pre-equalization circuit 2, an OFDM Modulation circuit 3, photoelectric module 7 and signal processing module 11;
[0014] The input end of the amplifying circuit 1 is connected to the output end of the signal source, the output end of the amplifying circuit 1 is connected to the communication signal input end of the OFDM modulation circuit 3, the output end of the pre-equalization circuit 2 is connected to the compensation signal input end of the OFDM modulation circuit 3, OFDM modulation The output end of the circuit 3 is connected to the input end of the LED drive circuit 4, the output end of the LED drive circuit 4 is connected to the input end of the LED array 5. The optical filter 6 rece...
Example Embodiment
[0016] Embodiment 2: This embodiment is to further explain the OFDM-based LED visible light communication system described in Embodiment 1. In this embodiment, the photoelectric module 7 includes a PIN photodetector 8, a preamplifier circuit 9, and Low pass filter 10;
[0017] The PIN photodetector 8 receives the light beam. The output end of the PIN photodetector 8 is connected to the input end of the preamplifier circuit 9, and the output end of the preamplifier circuit 9 is connected to the input end of the low-pass filter 10, The output terminal is used as the output terminal of the photoelectric module 7.
Example Embodiment
[0018] Specific embodiment 3: This embodiment is to further explain the OFDM-based LED visible light communication system described in specific embodiment 1. In this embodiment, the above-mentioned signal processing module 11 includes an OFDM demodulation circuit 12, a DSP 13 and a post-equalization circuit 14;
[0019] The input end of the OFDM demodulation circuit 12 and the communication signal input end of the DSP13 are both used as the input end of the signal processing module 11. The output end of the OFDM demodulation circuit 12 is connected to the demodulation signal input end of DSP13, and the obvious characteristic signal output end of DSP13 is connected The input end of the post-equalization circuit 14 and the output end of the post-equalization circuit 14 are connected to the compensation signal input end of the DSP 13, and the communication signal output end of the DSP 13 is used as the output end of the signal processing module 11.
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