Signal transmitting method, signal receiving method, and related device and system

A signal receiving method, comprising:

• receiving a signal transmitted by a signal transmit device, wherein the received signal from the transmit device was generated by the signal transmit device splitting a generated single-wavelength optical carrier into N subcarriers with a same wavelength by using a splitting device, and performing data modulation and amplitude spread spectrum modulation on the N subcarriers based on N low-speed data signals and N spreading codes, the performing data modulation and amplitude spread spectrum modulation on each of the N subcarriers including splitting each of the N subcarriers into a first tributary subcarrier and a second tributary subcarrier and separately performing data modulation and amplitude spread spectrum modulation on each of the first and second tributary subcarriers of each of the N subcarriers to obtain first and second tributary spread spectrum modulation signals, and combining the first and second tributary spread spectrum modulation signals to obtain N spread spectrum modulation signals, and the signal transmit device combines the N spread spectrum modulation signals, to obtain the signal;
• performing optical-to-electrical conversion processing and analog-to-digital conversion processing on the received signal, to obtain a digital signal;
• and
• despreading the digital signal based on the N spreading codes, to obtain N despread signals, and performing low-pass filtering on each of the N despread signals, to obtain N data signals, wherein N is a positive integer not less than 2.

A signal transmit device, wherein the device comprises a light source, a deserializer, a first splitting device, a first combining device, and N spread spectrum modulation devices;

• and a value of N is a positive integer not less than 2, wherein
• the light source is configured to:
• generate a single-wavelength optical carrier, and output the single-wavelength optical carrier to the first splitting device;
• the deserializer is configured to:
• deserialize a received high-speed data signal into N low-speed data signals, and output the N low-speed data signals to the N spread spectrum modulation devices, wherein the N low-speed data signals are in a one-to-one correspondence with the N spread spectrum modulation devices;
• the first splitting device is configured to:
• split the single-wavelength optical carrier generated by the light source into N subcarriers with a same wavelength, and output the N subcarriers to the N spread spectrum modulation devices, wherein the N subcarriers are in a one-to-one correspondence with the N spread spectrum modulation devices;
• each of the N spread spectrum modulation devices is configured to:
• respectively perform, according to a low-speed data signal corresponding to the spread spectrum modulation device and a spreading code in N spreading codes that is corresponding to the spread spectrum modulation device, data modulation and amplitude spread spectrum modulation on a subcarrier corresponding to the spread spectrum modulation device, to obtain a spread spectrum modulation signal corresponding to the spread spectrum modulation device, and output the spread spectrum modulation signal to the first combining device, wherein the N spreading codes are in a one-to-one correspondence with the N spread spectrum modulation devices;
• any of the N spread spectrum modulation devices is configured to:
• split a subcarrier corresponding to the spread spectrum modulation device into a first tributary subcarrier and a second tributary subcarrier, and separately perform phase shifting on the first tributary subcarrier and the second tributary subcarrier;
• perform data modulation and amplitude spread spectrum modulation on each of the first and second tributary subcarriers to obtain first and second tributary spread spectrum modulation signals of each of the N subcarriers;
• combine the first and second tributary spread spectrum modulation signals to obtain a spread spectrum modulation signal corresponding to the spread spectrum modulation device, and output the spread spectrum modulation signal to the first combining device;
• and
• the first combining device is configured to combine N spread spectrum modulation signals received from the N spread spectrum modulation devices into a combined signal for outputting.

A signal receiving device, comprising an optical-to-electrical converter OEC, an analog to digital converter ADC, and a digital signal processor DSP, wherein

• the OEC is configured to:
• receive a signal transmitted by a signal transmit device, convert the received signal into an electrical signal, and output the electrical signal to the ADC, wherein the signal transmit device splits, by using a splitting device, a single-wavelength optical carrier generated by a light source into N subcarriers with a same wavelength, performs data modulation and amplitude spread spectrum modulation on the N subcarriers based on N low-speed data signals and N spreading codes, the performing data modulation and amplitude spread spectrum modulation on each of the N subcarriers includes splitting each of the N subcarriers into a first tributary subcarrier and a second tributary subcarrier and separately performing data modulation and amplitude spread spectrum modulation on each of the first and second tributary subcarriers of each of the N subcarriers to obtain first and second tributary spread spectrum modulation signals, and combining the first and second tributary spread spectrum modulation signals to obtain N spread spectrum modulation signals, and the signal transmit device combines the N spread spectrum modulation signals, to obtain the signal;
• the ADC is configured to:
• receive the electrical signal output by the OEC, convert the electrical signal into a digital signal, and output the digital signal to the DSP;
• and
• the DSP is configured to:
• receive the digital signal output by the ADC, despread the digital signal based on the N spreading codes, to obtain N despread signals, and perform low-pass filtering on each of the N despread signals, to obtain N data signals, wherein N is a positive integer not less than 2.