Wireless optical communication data transmission device and method

Abstract

The invention discloses a wireless optical communication data transmission device and method. The wireless optical communication data transmission device comprises a transmitting module and a receiving module, wherein the transmitting module comprises a transmission gate and is used for converting serial data into multiple control signals to control the transmission gate to output an electric signal, converting the electric signal into an optical signal and transmitting the optical signal to the receiving module; the receiving module comprises a peak detector and a comparator group; the receiving module is used for converting a received optical signal into an electric signal and outputting serial data after the threshold judgment by the comparator group; the peak detector provides a reference voltage for the comparator group according to the received electric signal, and the comparator group performs voltage division according to the reference voltage to determine a threshold value. The device is not limited by a distance transmission environment, the stability and the mobility of wireless optical communication are enhanced, and the bandwidth utilization rate can be improved through high-order PAM.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a wireless optical communication data transmission device and method. Background technique [0002] With the development of 5G and big data technology, people have a higher demand for network speed. For the non-return-to-zero (NRZ) modulation method currently used in the mainstream, only 1 bit of information can be transmitted in one symbol period, so in order to achieve a higher communication rate, a higher bandwidth is required, and it is very difficult to increase the bandwidth of existing optical devices . Therefore, the multi-level pulse amplitude modulation (M-PAM) high-order modulation method will support the optical interconnection to move towards a higher rate. In optical fiber communication, pulse amplitude modulation PAM4 has been widely used, and there are relatively mature PAM4 optical modules. In wireless optical communication, due to the limitation of the ba...

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Problems solved by technology

However, in wireless optical communication, there is no mature wireless optical module supporting M-PAM, which limits the rate of digital baseband transmission in wireless optical communication.

[0003] Existing visible light communication light source lamps for PAM modulation convert serial input control signals into parallel output signals through serial-to-parallel converters, and emit PAM signals by lighting different numbers of lamp beads. However, in the drive circuit , the lighting and extinguishing of different lamp beads have different delay times, which limits the modulation bandwidth of the light source, making the transmitter unsuitable for high-speed M-PAM communication, and the light source lamp depends on the position angle of the receiver. If the receiver If the angular position changes, the received light intensity is not linearly proportional to the number of lighted lamp beads, which increases the complexity of the receiver

There is also a clock data recovery circuit for a PAM4 receiver with a waveform screening function, and the PAM4 receiver forms a clock data recovery circuit body through a comparator and a phase detector. The reference threshold voltage of the comparator is fixed, so that its receiving position can only be fixed , and is easily affected by external adjustment interference, and cannot be adaptively adjusted

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