Differential optical space shift keying modulation system and modulation method

Abstract

The invention discloses a differential optical space shift keying modulation system and a modulation method. The system comprises a differential space shift keying modulation module, an LED driving circuit, and an LEDthat are at a transmitting end, , a photoelectric detection circuit,a signal processing circuit and a signal demodulation modulethat are at a receiving end,. A serial data stream firstly passes through the differential space shift keying modulation module to generate a corresponding mapping matrix. Differential operation is achieved by conducting Kronecker product on the mapping matrix at the current moment and the transmission matrix at the previous moment, and the transmission matrix at the current moment is obtained. And the transmission matrix signal of the current symbolperiod is amplified by the driving amplification circuit and then sent by the LED. At a receiving end, a photoelectric conversion circuit and a signal processing circuit are used for converting an optical signal in an atmospheric channel into a processable parallel electric signal, and the processable parallel electric signal is sent to a signal demodulation module in the FPGA. And the demodulation module demodulates the differential signal according to the transmission matrix of the current symbol period and the mapping matrix of the previous symbol period, and finally recovers the original data stream.

Description

technical field [0001] The invention relates to a differential optical space shift keying modulation system and modulation method, belonging to the technical field of wireless optical communication. Background technique [0002] With the advent of the Internet of Things, big data, and artificial intelligence technologies, the amount of data carried by wireless communications is growing explosively. However, the existing spectrum resources and technologies are difficult to meet the explosive growth of data demand, which urgently requires us to find technologies with larger capacity, higher speed and lower latency to solve this problem. In recent years, visible light communication (Visible Light Communication, VLC) has gradually entered the field of vision of researchers, which provides an effective method for transmitting massive data. VLC is a new communication method that uses LED semiconductor lighting as the light source, uses visible light as the carrier, and transmits ...

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Problems solved by technology

[0004] But so far, all studies on optical spatial modulation systems assume that accurate channel state information (CSI) can be obtained at both ends of the transceiver, and the channel is a time-invariant slow fading channel, that is, the channel change is compared to the symbol transmission slow rate assumption

However, due to the time-varying and complex channels of the actual communication system, channel estimation is particularly difficult.

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