Ssb signal generation method and apparatus, and electronic device

Abstract

The application provides an SSB signal generation method and device and electronic equipment, and relates to the field of optical communication. The method comprises the following steps: acquiring a first pseudo-random binary sequence and a second pseudo-random binary sequence, and performing a modulation operation on the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal; performing a preprocessing operation on the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain a left sideband signal and a right sideband signal with different frequencies; adding the left sideband signal and the right sideband signal and inputting the added signal into a digital-to-analog converter; inputting an analog signal converted by the digital-to-analog converter into an I / Q modulator; modulating an optical carrier signal generated by an external cavity laser to obtain a modulated signal; performing PD detection on the modulated signal; and performing a filtering operation on the PD-detected signal to obtain a target SSB signal, thereby reducing the influence of SSB signal amplitude imbalance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication technology, and particularly relates to an SSB signal generation method and device and electronic equipment. BACKGROUND

[0002] A dual-SSB (Single Sideband) system is an important way to replace multiple transmitters with two sideband signals (Left Sideband, LSB, and Right Sideband, RSB). Usually, these signals are separated at the receiving end using two optical bandpass filters (OBPFs), and then the LSB and RSB are detected respectively. This results in a high structural complexity.

[0003] In order to solve the problem of high structural complexity, two methods are usually used in the prior art. The first method is to use an independent dual-SSB system to simplify the transmission process, but this method simplifies the transmission process but does not reduce the structural complexity of the system, and instead increases the structural complexity. The second method is to use a low-complexity independent dual-SSB signal transmission method, but this method is easily limited by capacity and rate, resulting in an undesirable spectrum utilization efficiency. Many studies on independent dual-SSB signals do not analyze the amplitude imbalance problem caused by non-ideal I / Q modulators and the mismatch of the transmission path from the DAC (Digital-to-Analog Converter) to the I / Q modulator, which is a problem that needs to be avoided to reduce the complexity of the system and improve the capacity and rate of the system.

[0004] At present, no effective technical solutions have been proposed to solve the problem of SSB signal amplitude imbalance in the related art. SUMMARY

[0005] The embodiments of the present application provide a method to at least solve the problem of SSB signal amplitude imbalance in the prior art.

[0006] According to an aspect of the embodiments of the present application, a method for generating an SSB signal is provided. The method includes: obtaining a first pseudo-random binary sequence and a second pseudo-random binary sequence, and modulating the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length; pre-processing the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain a left-sideband signal corresponding to the PS-GS4QAM baseband signal and a right-sideband signal corresponding to the QPSK baseband signal, wherein the left-sideband signal corresponds to a frequency different from that of the right-sideband signal; adding the left-sideband signal and the right-sideband signal and inputting the sum into a digital-to-analog converter, inputting an analog signal converted by the digital-to-analog converter into an I / Q modulator, and modulating an optical carrier signal generated by an external cavity laser to obtain a modulated signal; performing PD detection on the modulated signal, and filtering the PD-detected signal to obtain a target SSB signal.

[0007] According to another aspect of the embodiments of the present application, an apparatus for generating an SSB signal is provided. The apparatus includes: a digital signal processing unit configured to generate a first pseudo-random binary sequence and a second pseudo-random binary sequence, and modulate the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length; the digital signal processing unit is further configured to pre-process the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain a left-sideband signal corresponding to the PS-GS4QAM baseband signal and a right-sideband signal corresponding to the QPSK baseband signal, and add the left-sideband signal and the right-sideband signal and input the sum into a digital-to-analog converter, wherein the left-sideband signal corresponds to a frequency different from that of the right-sideband signal; the digital-to-analog converter is configured to convert a signal input into the digital-to-analog converter to obtain an analog signal, and input the analog signal into an I / Q modulator, wherein the analog signal includes a real part signal and an imaginary part signal, the real part signal is an I-path modulation signal, and the imaginary part signal is a Q-path modulation signal; the I / Q modulator is configured to modulate an optical carrier signal generated by an external cavity laser according to the real part signal and the imaginary part signal to obtain a modulated signal; and a detection unit is configured to perform PD detection on the modulated signal, and filter the PD-detected signal to obtain a target SSB signal.

[0008] Optionally, the digital signal processing unit comprises: a first acquisition unit configured to acquire a carrier signal with a frequency of f S1 and a carrier signal with a frequency of f S2 ; an up-sampling unit configured to up-sample the PS-GS 4QAM baseband signal and the QPSK baseband signal; a root-raised cosine shaping unit configured to root-raised cosine shape the PS-GS 4QAM baseband signal and the QPSK baseband signal; a first modulation unit configured to modulate the carrier signal with the frequency of f S1 to obtain a left sideband signal, and modulate the carrier signal with the frequency of f S2 to obtain a right sideband signal.

[0009] Optionally, the digital signal processing unit further comprises: a sequence processing unit configured to perform sequence processing on the first pseudo-random binary sequence by using a probability shaping algorithm to obtain a first pseudo-random binary sequence after probability shaping; a second acquisition unit configured to acquire a preset modulation mode, wherein the preset modulation mode comprises geometrically shaped quadrature amplitude modulation and quadrature phase shift keying modulation; a second modulation unit configured to modulate the first pseudo-random binary sequence after probability shaping by using the geometrically shaped quadrature amplitude modulation to obtain the PS-GS 4QAM baseband signal; and a third modulation unit configured to modulate the second pseudo-random binary sequence by using the quadrature phase shift keying modulation to obtain the QPSK baseband signal.

[0010] Optionally, the digital signal processing unit further comprises a summing unit configured to perform summing operation on the left sideband signal and the right sideband signal to obtain a digital sum signal, wherein the digital sum signal comprises a real part signal and an imaginary part signal.

[0011] Optionally, the digital-to-analog converter comprises: a conversion unit configured to convert the digital sum signal into the analog signal; and an input unit configured to input the analog signal to the I / Q modulator, wherein the real part signal is used as an I path modulation signal and the imaginary part signal is used as a Q path modulation signal.

[0012] Optionally, the I / Q modulator comprises a fourth modulation unit configured to modulate an optical carrier signal generated by an external cavity laser to obtain the modulated signal.

[0013] The fourth modulation unit comprises: a splitting unit configured to split the optical carrier signal generated by the external cavity laser into a first optical signal and a second optical signal with the same frequency and power by using a power divider in the I / Q modulator; a first modulation subunit configured to modulate the first optical signal according to the real part signal by using a first Mach-Zehnder modulator in the I / Q modulator to obtain an I-channel modulation signal; a second modulation subunit configured to modulate the second optical signal according to the imaginary part signal by using a second Mach-Zehnder modulator in the I / Q modulator to obtain a reference optical signal, and to perform phase modulation on the reference optical signal by using a 90-degree phase modulator in the I / Q modulator to obtain a Q-channel modulation signal; and a coupling unit configured to couple the I-channel modulation signal and the Q-channel modulation signal by using an optical coupler in the I / Q modulator to obtain the modulated signal.

[0014] Optionally, the detection unit comprises: an input module configured to input the modulated signal into a PD detection device to obtain a plurality of detection signals; a third acquisition unit configured to acquire a preset frequency; and a filtering unit configured to perform the filtering operation on the plurality of detection signals according to the preset frequency to obtain the target SSB signal.

[0015] According to another aspect of the embodiments of the present application, a computer readable storage medium is provided, which stores computer instructions for causing a computer to execute the above SSB signal generation method.

[0016] According to another aspect of the embodiments of the present application, an electronic device is also provided, which comprises at least one processor and a memory communicatively connected to the at least one processor, wherein the memory stores computer programs executable by the at least one processor, and the computer programs are executed by the at least one processor to cause the at least one processor to execute the above SSB signal generation method.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present application can have the following beneficial effects:

[0018] The SSB signal generation method sets different frequencies for different sideband signals, thereby reducing the influence of the amplitude imbalance of the double SSB optical signal. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a flow chart of an optional SSB signal generation method according to an embodiment of the application;

[0021] Figure 2 is a schematic diagram of an optional optical asymmetric dual-path SSB modulation scheme based on an I / Q modulator and a single PD according to an embodiment of the application;

[0022] Figure 3 is a schematic diagram of an optional ideal constellation diagram and mapping relationship of a signal according to an embodiment of the application;

[0023] Figure 4 is a schematic diagram of an optional millimeter wave signal generated after non-ideal I / Q modulator output and PD detection according to an embodiment of the application;

[0024] Figure 5 is a structural schematic diagram of an optional SSB signal generation device according to an embodiment of the application;

[0025] Figure 6 is a structural schematic diagram of an optional electronic device according to an embodiment of the application. DETAILED DESCRIPTION

[0026] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] Before introducing the technical solutions of the present application, some terms related to the present application will be explained. To simplify the description, the corresponding English abbreviations will be used to represent the corresponding terms in the subsequent description. The following explanations can be used as optional solutions and can be combined with the technical solutions of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0029] Photo-Diode (PD): A semiconductor device composed of a PN junction, with single-directional conduction characteristics;

[0030] Dual-SSB: A modulation technique. In this modulation technique, the signal is divided into two channels, and each channel carries only half of the spectral content of the signal, i.e. Left Sideband (LSB, also known as lower sideband in background technology) and Right Sideband (RSB, also known as upper sideband in background technology), while the carrier signal carries the full spectrum information;

[0031] In-phase / Quadrature-phase Modulator (I / Q Modulator): A key component for wireless communication and digital signal processing. Its function is to decompose the signal into two orthogonal signals, called "In-phase" and "Quadrature" signals. These two signals have the same frequency but a phase difference of 90 degrees;

[0032] Digital Signal Processor (DSP): A special-purpose microprocessor for processing digital signals. It is usually used for real-time processing of digital signals from various sources (such as sound, video, sensor data, etc.);

[0033] Probability Shaping Geometric Shaping Quadrature Amplitude Modulation (PS-GS4QAM): A communication modulation technique that combines the concepts of probability shaping and geometric shaping. In PS-GS4QAM, the signal is modulated by four different phase and amplitude states, and is subjected to probability shaping and geometric shaping to maximize channel capacity. This modulation technique aims to improve signal transmission quality and has the advantages of anti-interference and high capacity transmission;

[0034] Quadrature Phase Shift Keying (QPSK): a common modulation method in the field of digital communication. The principle of quadrature phase shift keying is to change the initial phase of the carrier waveform during transmission, and convert digital information into different phase states for transmission.

[0035] Quadrature Amplitude Modulation (QAM): a modulation method that modulates two modulation signals on two orthogonal carriers with equal frequency and 90-degree phase difference (one signal is called I signal, and the other signal is called Q signal), and then adds the two amplitude-modulated signals vectorially to obtain an amplitude-modulated signal called quadrature amplitude-modulated signal.

[0036] Pseudo-Random Binary Sequence (PRBS): a pseudo-random sequence containing only 0 and 1;

[0037] Rise Cosine Shaping (RC): a common filtering technique in digital communication, used to suppress noise and reduce inter-symbol interference in transmitted signals. It achieves this purpose by filtering the signal with a rise cosine, which has the characteristics of limited bandwidth in the frequency domain and minimum distortion in the time domain.

[0038] External Cavity Laser (ECL): a laser that uses an external cavity for optical feedback;

[0039] Phase Modulator (PM): a device that implements phase modulation, which is a modulation method that changes the phase of the carrier to transmit information at the frequency of the modulation signal;

[0040] Mach-Zehnder Modulator (MZM): an optoelectronic device whose working principle is mainly based on Mach-Zehnder interference effect and electro-optic effect. By adjusting the voltage of the phase modulator, the interference of the two light signals at the output end can be controlled, and thus the amplitude and phase of the output light signal can be modulated.

[0041] Digital to Analog Converter (DAC): also known as D / A converter, it is a device that converts digital signals to analog signals;

[0042] Continuous Wave (CW): A transmission mode of electromagnetic wave signal, usually refers to a continuous signal used in radio communication;

[0043] Maxwell-Boltzmann distribution (MB distribution): A probability distribution describing the speed of microscopic particles at a certain temperature.

[0044] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] In recent years, many scholars have been studying independent dual-SSB systems to simplify the transmission process. Although this method simplifies the transmission process, it leads to high system structure complexity. Dual-SSB system is an important way to replace multiple transmitters with two sideband signals LSB and RSB. Usually, these signals are separated at the receiving end using two optical bandpass filters (OBPFs), and then the LSB and RSB are detected respectively. This leads to high system structure complexity. Some scholars have proposed a low-complexity independent dual-SSB signal transmission method based on an optical in-phase / quadrature (I / Q) modulator and single photodiode (PD) detection. After 50 kilometers of standard single-mode fiber (SSMF) transmission, the bit error rate (BER) of LSB and RSB is less than the hard decision forward error correction (HD-FEC) threshold of 3.8×10 -3 This method is susceptible to capacity and rate limitations, resulting in an undesirable spectrum utilization efficiency. Another scholar has proposed a dual-SSB signal single-PD direct detection system without OBPF, thereby reducing the complexity and cost of the receiver, but the system performance is low. At the same time, the above three methods also do not solve the problem of amplitude imbalance caused by non-ideal I / Q modulators.

[0046] In recent years, probability shaping (PS) has been proven to be able to narrow the Shannon capacity limit. Compared with uniformly distributed signals, the average energy and source entropy of PS processed signals are reduced, so the system performance is better. In addition, the reduction of the average energy of the PS signal is also meaningful for improving the tolerance of the system to nonlinear fiber effects and mitigating the saturation of optoelectronic devices. In recent years, many different PS schemes have been proposed. However, the independent dual-SSB optical signal generation and detection scheme based on I / Q modulator and single PD has not yet introduced PS technology.

[0047] To solve the above problems, the embodiment of the present application provides a SSB signal generation method, which combines low complexity independent asymmetric double SSB signal and probability shaping (PS), is a low complexity independent asymmetric double SSB optical signal generation method based on probability shaping (PS) technology, so as to reduce the influence of double SSB optical signal amplitude imbalance and improve the system performance under the condition of limited signal-to-noise ratio. The present application will be further described in detail in combination with the drawings and embodiments, and the following description will be combined as a whole Figure 2 ( Figure 2 As shown in Fig. 1, it is a schematic diagram of optical asymmetric double SSB modulation scheme based on an I / Q modulator and a single PD. Among them, Figure 2 The pseudo-random binary sequence 1 (hereinafter referred to as PRBS1) and the pseudo-random binary sequence 2 (hereinafter referred to as PRBS2) in Fig. 1 are the first pseudo-random binary sequence and the second pseudo-random binary sequence, respectively; Figure 2 The (a) diagram in Fig. 1 is a signal schematic diagram of LSB; Figure 2 The (b) diagram in Fig. 1 is a signal schematic diagram of RSB; Figure 2 The (c) diagram in Fig. 1 is an output schematic diagram of I / Q modulator; Figure 2 The (d) diagram in Fig. 1 is a schematic diagram of received signal after PD detection) are described in detail:

[0048] As an optional implementation, please refer to Figure 1 The embodiment of the present application provides a SSB signal generation method, which comprises the following steps:

[0049] S102, a first pseudo-random binary sequence and a second pseudo-random binary sequence are obtained, and the first pseudo-random binary sequence and the second pseudo-random binary sequence are modulated to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length;

[0050] S104, the PS-GS4QAM baseband signal and the QPSK baseband signal are preprocessed respectively to obtain a left sideband signal corresponding to the PS-GS4QAM baseband signal and a right sideband signal corresponding to the QPSK baseband signal, wherein the frequency corresponding to the left sideband signal is not equal to the frequency corresponding to the right sideband signal;

[0051] S106, the left sideband signal and the right sideband signal are added and input into a digital-to-analog converter, an analog signal converted by the digital-to-analog converter is input into an I / Q modulator, and an optical carrier signal generated by an external cavity laser is modulated to obtain a modulated signal, wherein the analog signal comprises a real part signal and an imaginary part signal, the real part signal is used as an I modulated signal, and the imaginary part signal is used as a Q modulated signal;

[0052] S108, the modulated signal is subjected to PD detection, and the signal after PD detection is subjected to filtering operation to obtain a target SSB signal.

[0053] It should be noted that the first pseudo-random sequence (PRBS1 for short) and the second pseudo-random sequence (PRBS2 for short) in S102 above can be two pseudo-random binary sequences of the same length generated in a DSP, and the modulation operation in S1 above can be but is not limited to being understood as using different modulation modes to modulate PRBS1 and PRBS2 respectively to obtain a PS-GS4QAM baseband signal corresponding to PRBS1 and a QPSK baseband signal corresponding to PRBS2, and a probability shaping algorithm is added in the process of modulating PRBS1, the probability shaping algorithm is based on probability theory and mathematical model, and the signal is appropriately processed to realize the shaping of the signal, and the algorithm can be designed according to specific requirements, and the combination of the probability shaping algorithm in the present application can improve the performance of the signal, such as reducing the bit error rate and improving the signal-to-noise ratio.

[0054] The probability shaping scheme is to add probability shaping in the modulation process of PRBS1 signal to generate PS-GS4QAM baseband signal, so that the constellation diagram of the PS-GS4QAM baseband signal and the QPSK baseband signal has lower average energy and source entropy compared with the ordinary uniform constellation diagram, and the corresponding constellation diagram is as shown in Figure 3 .

[0055] The specific steps of modulating PRBS1 can be: performing probability shaping processing on PRBS1, passing the signal after probability shaping processing to a modulator, converting the signal into an analog signal or a digital signal (converted into a digital signal in the present application) suitable for transmission according to a preset modulation mode (such as frequency modulation, amplitude modulation, etc., and the GS4QAM modulation mode is preferred in the present application, that is, a quaternary quadrature amplitude modulation, in which the amplitude and phase of the signal can represent four different digital symbols to transmit digital information), so as to obtain a PS-GS4QAM baseband signal; and the modulation of PRBS2 in the present application is to obtain a QPSK baseband signal by using a quadrature phase shift keying (QPSK) modulation mode.

[0056] The preprocessing operation in S104 above can be but is not limited to being understood as sequentially performing upsampling, raised cosine shaping (such as raised cosine filtering shaping as shown in Figure 2 ) and frequency conversion on the PS-GS4QAM baseband signal and the QPSK baseband signal, so as to obtain an LSB (such as a left sideband as shown in Figure 2 , and the specific signal schematic diagram is as shown in the signal schematic diagram (a) of Figure 2 ) and an RSB (such as a right sideband as shown in Figure 2 , and the specific signal schematic diagram is as shown in the signal schematic diagram (b) of Figure 2The up-sampling can be increasing new signal data points by interpolation method to improve data quality. The raised cosine (RC) shaping can be implemented by a raised cosine filter (RCF) for pulse shaping and filtering of digital signals. In digital communication, the raised cosine filter is usually used in digital modulation techniques such as quadrature amplitude modulation (QAM), frequency-shift keying (FSK) and other digital modulation methods. By inputting the digital signal into the raised cosine filter, it can shape and filter the signal to reduce the signal bandwidth and convert it into a baseband signal more suitable for transmission. At the receiving end, the same filter as the transmitting end can be used to demodulate and recover the received signal. Using the raised cosine filter can ensure the reliability of the communication signal transmission and reduce the bit error rate. The up-conversion is a process of converting an input signal with a certain frequency into an output signal with a higher frequency (usually without changing the information content and modulation method of the signal).

[0057] The operation in S106 can be, but is not limited to, adding the left band and the right band as shown in Figure 2 to the digital-to-analog converter as shown in Figure 2 , and then modulating the optical carrier signal generated by the external cavity laser as shown in Figure 2 by the converted signal to obtain the modulated signal.

[0058] The operations in S1 to S4 can be, but are not limited to, first adding probability shaping in the GS4QAM signal generation process, then using a low-complexity independent asymmetric dual SSB signal to generate an asymmetric dual SSB optical signal with QPSK; finally, after PD detection, receiving the required millimeter wave signal at the receiving end, synthesizing the PS-16QAM signal and its constellation diagram. The phase of the received required millimeter wave signal is the difference between the phases of the LSB and RSB signals, and the amplitude is related to J1(βA r )J -1 (βA l ), and the constellation diagrams of LSB-PS-GS4QAM, RSB-QPSK and PS-16QAM are as shown in Figure 3 . Figure 3 The color correspondence relationship shown in Figure 3 (a) of FIG. 1, (b) of FIG. 1, and Figure 3 (c) of FIG. 1 reflects the mapping relationship between the received PS-16QAM signal and the dual SSB optical signal, wherein Figure 3 The colors in (c) of FIG. 1 are divided into outer circle colors and inner circle colors. The inner circle colors are shown in the circles, and the outer circle colors are the colors pointed by the line segments.

[0059] By the above-mentioned embodiments of the present application, the first pseudo-random binary sequence and the second pseudo-random binary sequence are obtained, and the first pseudo-random binary sequence and the second pseudo-random binary sequence are modulated to obtain the PS-GS4QAM baseband signal and the QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length; the PS-GS4QAM baseband signal and the QPSK baseband signal are respectively preprocessed to obtain the left sideband signal corresponding to the PS-GS4QAM baseband signal and the right sideband signal corresponding to the QPSK baseband signal, wherein the frequency corresponding to the left sideband signal is not equal to the frequency corresponding to the right sideband signal; the left sideband signal and the right sideband signal are added and input into a digital-to-analog converter, and the analog signal converted by the digital-to-analog converter is input into an I / Q modulator to modulate the optical carrier signal generated by the external cavity laser to obtain a modulated signal, wherein the analog signal includes a real part signal and an imaginary part signal, the real part signal is used as an I modulated signal, and the imaginary part signal is used as a Q modulated signal; the modulated signal is subjected to PD detection, and the signal after PD detection is filtered to obtain a target SSB signal. The left sideband (LSB) and the right sideband (RSB) are set to different frequencies, so that the crosstalk caused by the amplitude imbalance is ingeniously separated from the target signal after the PD detection (after the PD square law transformation), and the system complexity is not increased, so as to reduce the influence of the amplitude imbalance of the optical signal generated by the I / Q modulator on the millimeter wave signal required by the present application.

[0060] As an optional embodiment, the above-mentioned pre-processing of the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain the left sideband signal corresponding to the PS-GS4QAM baseband signal and the right sideband signal corresponding to the QPSK baseband signal includes:

[0061] S1, obtaining a carrier signal with a frequency of f S1 and a carrier signal with a frequency of f S2 ;

[0062] S2, upsampling and raising cosine shaping the PS-GS4QAM baseband signal, and then modulating the carrier signal with the frequency of f S1 to obtain the left sideband signal;

[0063] S3, upsampling and raising cosine shaping the QPSK baseband signal, and then modulating the carrier signal with the frequency of f S2 to obtain the right sideband signal.

[0064] It should be noted that f S1 and f S2 in the above-mentioned S1 are not equal, f S1 and f S2The size of the value can be preset. The operation in S2 can be, but is not limited to, upsampling and cosine shaping the PS-GS4QAM baseband signal to obtain a reference PS-GS4QAM baseband signal (it can be understood that after the cosine shaping, the cosine-shaped signal is up-converted to obtain the reference PS-GS4QAM baseband signal). The modulation of the carrier signal with the frequency f S1 is performed according to the reference PS-GS4QAM baseband signal. S1 The modulation of the carrier signal with the frequency f S1 is performed according to the reference PS-GS4QAM baseband signal, so as to obtain the independent LSB. The operation in S3 can be, but is not limited to, upsampling and cosine shaping the QPSK baseband signal to obtain a reference QPSK baseband signal (it can be understood that after the cosine shaping, the cosine-shaped signal is up-converted to obtain the reference QPSK baseband signal). The modulation of the carrier signal with the frequency f S2 is performed according to the reference QPSK baseband signal. S2 The modulation of the carrier signal with the frequency f S2 is performed according to the reference QPSK baseband signal, so as to obtain the independent RSB.

[0065] According to the above embodiments of the present application, the LSB and the RSB with high signal quality can be determined, so as to facilitate subsequent processing of the signal.

[0066] As an optional embodiment, the modulation of the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain the PS-GS4QAM baseband signal and the QPSK baseband signal includes:

[0067] S1, performing sequence processing on the first pseudo-random binary sequence by using a probability shaping algorithm to obtain a probability-shaped first pseudo-random binary sequence;

[0068] S2, obtaining a preset modulation mode, wherein the preset modulation mode includes geometrically shaped quaternary quadrature amplitude modulation and quadrature phase shift keying modulation.

[0069] S3, performing modulation on the probability-shaped first pseudo-random binary sequence by using the geometrically shaped quaternary quadrature amplitude modulation to obtain the PS-GS4QAM baseband signal.

[0070] S4, performing modulation on the second pseudo-random binary sequence by using the quadrature phase shift keying modulation to obtain the QPSK baseband signal.

[0071] The above-mentioned explanations of the terms related to S1 to S4 have been described above, and the present application will not be repeated here.

[0072] Through the above-mentioned embodiments of the present application, the PS-GS4QAM baseband signal and the QPSK baseband signal are obtained, which facilitates the modulation of the two baseband signals using two pseudo-random binary sequences of the same length in the subsequent DSP, and the signal average energy and source entropy are reduced compared with the uniform distribution signal, so the system performance is better. The present application creatively introduces it into the independent double SSB optical signal generation method, so that the constellation average energy and source entropy are reduced, thereby making the system performance close to the Shannon performance. And the present application organically combines two technologies, adds the probability shaping technology in the double SSB signal generation process, finally reduces the influence of the amplitude imbalance of the double SSB optical signal without increasing the system complexity, and improves the performance of the system under low signal-to-noise ratio.

[0073] As an optional embodiment, the left band signal and the right band signal are added and input into a digital-to-analog converter, the analog signal converted by the digital-to-analog converter is input into an I / Q modulator, and the optical carrier signal generated by the external cavity laser is modulated to obtain a modulated signal, which includes:

[0074] S1, adding the left band signal and the right band signal to obtain a digital addition signal, wherein the digital addition signal includes a real part signal and an imaginary part signal;

[0075] S2, converting the digital addition signal into an analog signal by using a digital-to-analog converter;

[0076] S3, inputting the analog signal into an I / Q modulator, the real part signal as an I modulating signal and the imaginary part signal as a Q modulating signal, and modulating the optical carrier signal generated by the external cavity laser to obtain a modulated signal.

[0077] The LSB (the above-mentioned left band signal) can be represented by the following formula one:

[0078]

[0079] The RSB (the above-mentioned right band signal) can be represented by the following formula two:

[0080]

[0081] Wherein, E LSB and E LSB respectively represent the PS-GS4QAM baseband signal and the QPSK baseband signal after upsampling, raised cosine shaping and up-conversion, and respectively represent the carrier frequencies of the LSB and RSB; the sum operation on the left band signal and the right band signal in S1-S2 above is to sum the LSB and RSB and then send to the digital-to-analog converter as shown in Figure 2 the analog signal obtained by the digital-to-analog conversion of the sum of the LSB and RSB, as shown in Figure 2 the output of the digital-to-analog converter (i.e. the analog signal above) can be represented by the following formula three:

[0082]

[0083] where A l and A r respectively represent the amplitudes of the LSB and RSB, and respectively represent the phases, ω l and ω r represent the angular frequencies. Without the coefficient j is the real part signal (i.e. with the coefficient j is the imaginary part signal (i.e.

[0084] Through the above embodiment of the present application, the sum operation is performed on the left band signal and the right band signal to obtain a digital sum signal, wherein the digital sum signal includes a real part signal and an imaginary part signal; a digital-to-analog converter is used to convert the digital sum signal into an analog signal; the analog signal is input to an I / Q modulator, the real part signal is used as an I-channel modulation signal, the imaginary part signal is used as a Q-channel modulation signal, and the optical carrier signal generated by the external cavity laser is modulated to obtain a modulated signal. Thus, the sum result of the two different baseband signals is accurately split into the real part signal part and the imaginary part signal part, which facilitates subsequent modulation of the optical signal.

[0085] As an optional embodiment, the above-mentioned inputting the analog signal to the I / Q modulator, using the real part signal as the I-channel modulation signal, using the imaginary part signal as the Q-channel modulation signal, and modulating the optical carrier signal generated by the external cavity laser to obtain the modulated signal, includes:

[0086] S1, using a power divider in the I / Q modulator to divide the optical carrier signal generated by the external cavity laser into a first optical signal and a second optical signal with the same frequency and the same power;

[0087] S2, according to the real part signal, using a first Mach-Zehnder modulator in the I / Q modulator to modulate the first optical signal to obtain the I-channel modulation signal;

[0088] S3, according to the imaginary part signal, using a second Mach-Zehnder modulator in the I / Q modulator to modulate the second optical signal to obtain a reference optical signal, and using a 90° phase modulator in the I / Q modulator to phase modulate the reference optical signal to obtain the Q-channel modulation signal;

[0089] S4, coupling the I-channel modulation signal and the Q-channel modulation signal by using the optical coupler in the I / Q modulator to obtain the modulated signal.

[0090] The operations in S1-S4 can be, but are not limited to, understood as sending a continuous wave (CW) optical signal with a frequency of f c and an angular frequency of ω c from the ECL (i.e., the above-mentioned external cavity laser) into the I / Q modulator for modulation, which can be expressed by the following formula four:

[0091] E CW (t) = E CW exp(j2πf c t) = E CW exp(jω c t) Formula four

[0092] The I / Q modulator includes a power divider, an optical coupler, two MZMs, and a 90-degree phase modulator, etc. The optical coupler of the I / Q modulator divides the input optical signal of the ECL into the upper branch MZM and the lower branch MZM of the I / Q modulator with the same power, and the upper branch and the lower branch are respectively driven by the real part and the imaginary part output by the DAC. The operation in S2 can be, but is not limited to, understood as modulating the first optical signal by using the upper branch MZM by the real part driving to obtain the I-channel modulation signal; and the operation in S2 can be, but is not limited to, understood as modulating the second optical signal by using the lower branch MZM by the imaginary part driving, and phase-modulating the modulated second optical signal by using the phase modulator as shown in Figure 2 to obtain the Q-channel modulation signal, and finally coupling the I-channel modulation signal and the Q-channel modulation signal by using the optical coupler to obtain the modulated signal.

[0093] The non-ideal characteristics of the I / Q modulator and the mismatch of the transmission path from the DAC to the I / Q modulator will cause the amplitude imbalance of the double SSB optical signal (also referred to as double-channel SSB signal). Assuming that the amplitude ratio of the real part and the imaginary part of the double SSB optical signal at this time is (1-k) (k is very small), the double-channel SSB optical signal (i.e., the above-mentioned modulated signal, as shown in the signal diagram of Figure 2 (c) in the figure) generated by the I / Q modulator can be expressed by the following formula five:

[0094]

[0095] By the above-mentioned embodiments of the present application, the power divider in the I / Q modulator is used to divide the optical carrier signal generated by the external cavity laser into the first optical signal and the second optical signal which have the same frequency and the same power; the first Mach-Zehnder modulator in the I / Q modulator is used to modulate the first optical signal according to the real part signal to obtain the I-channel modulated signal; the second Mach-Zehnder modulator in the I / Q modulator is used to modulate the second optical signal according to the imaginary part signal to obtain the reference optical signal, and the 90° phase modulator in the I / Q modulator is used to modulate the phase of the reference optical signal to obtain the Q-channel modulated signal; the optical coupler in the I / Q modulator is used to couple the I-channel modulated signal and the Q-channel modulated signal to obtain the modulated signal. Thus, the unbalanced double SSB optical signal is obtained.

[0096] As an optional embodiment, the above-mentioned PD detection on the modulated signal and the filtering operation on the signal after the PD detection to obtain the target SSB signal, comprising:

[0097] S1, inputting the modulated signal into the PD detection device to obtain a plurality of detection signals;

[0098] S2, obtaining a preset frequency;

[0099] S3, performing a filtering operation on the plurality of detection signals according to the preset frequency to obtain the target SSB signal.

[0100] Herein Figure 4 (a) of FIG. Figure 4 (b) of FIG. (b) of FIG. Figure 4 (b) of FIG. Figure 4 ① and ③ in (a) of FIG.

[0101]

[0102] In the above-mentioned formula six, the first term is a direct current component, which can be ignored, and because f c The frequency of is higher than the working frequency range of the PD, so the term needs to be ignored. c The signal required by the present application is located at the term of ω r -ω l Therefore, the final photocurrent (such as the signal schematic diagram shown in (d) of FIG. Figure 2 can be approximately represented by the following formula seven according to the formula six:

[0103]

[0104] The first term is the desired millimeter wave signal of the present application, which can be extracted from the detected photocurrent. However, if is equal to (as shown in (a) of FIG. 1), the second and third terms will overlap with the desired millimeter wave signal of the present application, thus affecting the signal quality. As shown in (b) of FIG. 1, the amplitude imbalance of the dual-SSB optical signal will cause interference. As shown in (c) of FIG. 1, the present application sets different frequencies for the LSB and RSB to reduce the adverse effects of the amplitude imbalance (as shown in (d) of FIG. 1). As shown in (e) of FIG. 1, the frequencies of Figure 4 and Figure 2 are set to be different. After the above-mentioned addition of the LSB and RSB signals and transmission to the digital-to-analog converter (DAC), the unbalanced dual-SSB optical signal is directly input to the PD at the receiving end, and the above-mentioned simplification operations of equations six to seven are performed. As shown in (f) of FIG. 1, the crosstalk noise will appear at frequencies Figure 4 and Figure 2 . After detection by the PD, the interference will not overlap with the millimeter wave signal, so that filtering operations can be performed on signals of different frequencies to obtain the desired millimeter wave signal of the present application, thus reducing the adverse effects. Through the above-mentioned embodiments of the present application, the modulated signal is input to the PD detection device to obtain a plurality of detection signals; a preset frequency is obtained; and the target SSB signal is obtained by performing filtering operations on the plurality of detection signals according to the preset frequency. The adverse effects caused by the amplitude imbalance are reduced. It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0105] According to another aspect of the embodiments of the present application, an SSB signal generation device for implementing the above-mentioned SSB signal generation method is also provided, as shown in (a) of FIG. 2, the device comprises:

[0106] It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0107] According to another aspect of the embodiments of the present application, an SSB signal generation device for implementing the above-mentioned SSB signal generation method is also provided, as shown in (a) of FIG. 2, the device comprises: Figure 5

[0108] ​​​The digital signal processing unit 502 is configured to generate a first pseudo-random binary sequence and a second pseudo-random binary sequence, and perform modulation on the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length.

[0109] The digital signal processing unit 502 is further configured to perform pre-processing on the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain a left-sideband signal corresponding to the PS-GS4QAM baseband signal and a right-sideband signal corresponding to the QPSK baseband signal, and add the left-sideband signal and the right-sideband signal and input the sum into a digital-to-analog converter, wherein the left-sideband signal corresponds to a frequency different from that of the right-sideband signal.

[0110] The digital-to-analog converter 504 is configured to convert the signal input into the digital-to-analog converter to obtain an analog signal, and input the analog signal into an I / Q modulator, wherein the analog signal includes a real part signal and an imaginary part signal, the real part signal is used as an I path modulation signal, and the imaginary part signal is used as a Q path modulation signal.

[0111] The I / Q modulator 506 is configured to modulate an optical carrier signal generated by an external cavity laser according to the real part signal and the imaginary part signal to obtain a modulated signal.

[0112] The detection unit 508 is configured to perform PD detection on the modulated signal, and perform filtering on the signal after the PD detection to obtain a target SSB signal.

[0113] The specific manners in which the units in the above-described apparatus embodiments perform operations have been described in detail in the embodiments of the method, and will not be described here in detail.

[0114] According to still another aspect of the embodiments of the present application, an electronic device for implementing the above-mentioned SSB signal generation method is also provided, which can be a terminal device or a server as shown in Figure 6 The electronic device is taken as a terminal device for example in the present embodiment. As shown in Figure 6 The electronic device includes at least one processor 604 and a memory 602 connected with the at least one processor 604 in communication, wherein the memory 602 stores a computer program executable by the at least one processor 604, and the computer program is executed by the at least one processor 604 to enable the at least one processor 604 to perform the steps in any one of the above-mentioned method embodiments. The above-mentioned electronic device can be located in at least one of a plurality of network devices in a computer network. The above-mentioned processor 604 can be configured to execute the above-mentioned SSB signal generation method through the computer program.

[0115] Optionally, those skilled in the art can understand that Figure 6 The structure shown is only schematic, and the electronic device can also be a smart phone, a tablet computer, a palm computer, a Mobile Internet Device (MID), a PAD, or the like terminal device. Figure 6 It does not limit the structure of the above-mentioned electronic device. For example, the electronic device can further include more or less components (such as network interfaces, etc.) than those shown in the figure, or have a different configuration from that shown in the figure. Figure 6 Figure 6

[0116] The memory 602 can be used to store software programs and modules, such as program instructions / modules corresponding to the SSB signal generation method and device in the embodiments of the present application. The processor 604 executes various functions and data processing by running the software programs and modules stored in the memory 602, that is, implements the above-mentioned SSB signal generation method. The memory 602 can include a high-speed random access memory, and can further include a non-volatile memory such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. The memory 602 can further include a memory remotely arranged with respect to the processor 604, which can be connected to the terminal through a network. The above-mentioned network includes but is not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. As an example, as shown in the figure, the above-mentioned memory 602 can include but is not limited to the digital signal processing unit 502, the digital-to-analog converter 504, the I / Q modulator 506, and the detection unit 508 in the SSB signal generation device. In addition, other module units in the SSB signal generation device can also be included, but not limited to the above, which will not be described in detail in this example. Figure 6

[0117] Optionally, the transmission device 606 is used to receive or send data via a network. Specific examples of the above-mentioned network can include wired networks and wireless networks. In one example, the transmission device 606 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices and routers through a network cable to communicate with the Internet or a local area network. In one example, the transmission device 606 is a radio frequency (Radio Frequency, RF) module, which is used to communicate with the Internet in a wireless manner.

[0118] In addition, the above-mentioned electronic device further includes a display 608 and a connection bus 610 for connecting various module components in the above-mentioned electronic device.

[0119] ​​​According to an aspect of the present application, there is also provided a computer program product comprising computer programs / instructions containing program codes for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from a network by a communication part, and / or installed from a detachable medium. When the computer program is executed by a central processing unit, various functions provided by the embodiments of the present application are executed.

[0120] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0121] According to an aspect of the present application, there is also provided a computer readable storage medium, from which a processor of a computer device reads computer instructions, and the processor executes the computer instructions to enable the computer device to execute the above-mentioned SSB signal generation method.

[0122] Optionally, in the present embodiment, the above-mentioned computer readable storage medium can be configured to store a computer program for executing the above-mentioned SSB signal generation method.

[0123] Those skilled in the art can understand that all or part of the processes in the above-mentioned method embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), a flash memory (FM), a hard disk drive (HDD) or a solid-state drive (SSD), etc. The storage medium can also include a combination of the above-mentioned types of memories.

[0124] The units integrated in the above-mentioned embodiments, if realized in the form of software function units and sold or used as independent products, can be stored in the above-mentioned computer readable storage medium. Based on this understanding, the technical solutions of the present application, essentially or the parts that make contributions to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a number of instructions for enabling one or more computer devices (which can be personal computers, servers or network devices, etc.) to execute all or part of the steps of the above-mentioned methods.

[0125] In the above-mentioned embodiments of the present application, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0126] In several embodiments provided in the present application, it should be understood that the disclosed client can be implemented by other manners. Among them, the above-described apparatus embodiment is only schematic, for example, the division of the above-mentioned units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0127] The units described above as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or they can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment.

[0128] In addition, each functional unit in each embodiment of the present application can be integrated in a processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0129] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method of SSB signal generation, the method comprising: The method comprises the following steps: obtaining a first pseudo-random binary sequence and a second pseudo-random binary sequence, and modulating the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length; The PS-GS 4QAM baseband signal and the QPSK baseband signal are respectively subjected to a preprocessing operation to obtain a left sideband signal corresponding to the PS-GS 4QAM baseband signal and a right sideband signal corresponding to the QPSK baseband signal, including: acquiring a carrier signal with a frequency of and a carrier signal with a frequency of ; up-sampling and raising cosine shaping the PS-GS 4QAM baseband signal, and then modulating the carrier signal with the frequency of to obtain the left sideband signal; up-sampling and raising cosine shaping the QPSK baseband signal, and then modulating the carrier signal with the frequency of to obtain the right sideband signal, wherein the frequency corresponding to the left sideband signal is not equal to the frequency corresponding to the right sideband signal; adding the left sideband signal and the right sideband signal and inputting the added signal into a digital-to-analog converter, inputting an analog signal converted by the digital-to-analog converter into an I / Q modulator, and modulating an optical carrier signal generated by an external cavity laser to obtain a modulated signal, wherein the analog signal comprises a real part signal and an imaginary part signal, the real part signal is used as an I path modulation signal, and the imaginary part signal is used as a Q path modulation signal; performing PD detection on the modulated signal, and performing filtering on the PD detected signal to obtain a target SSB signal.

2. The method of claim 1, wherein, The method for obtaining a PS-GS4QAM baseband signal and a QPSK baseband signal by modulating a first pseudo-random binary sequence and a second pseudo-random binary sequence comprises the following steps: performing sequence processing on the first pseudo-random binary sequence by using a probability shaping algorithm to obtain a first pseudo-random binary sequence after probability shaping; obtaining a preset modulation mode, wherein the preset modulation mode comprises geometrically integral quaternary quadrature amplitude modulation and quadrature phase shift keying modulation; modulating the first pseudo-random binary sequence after probability shaping by using the geometrically integral quaternary quadrature amplitude modulation to obtain the PS-GS4QAM baseband signal; modulating the second pseudo-random binary sequence by using the quadrature phase shift keying modulation to obtain the QPSK baseband signal.

3. The method of claim 1, wherein, The method for adding a left sideband signal and a right sideband signal, inputting the added signal into a digital-to-analog converter, inputting an analog signal converted by the digital-to-analog converter into an I / Q modulator, and modulating an optical carrier signal generated by an external cavity laser to obtain a modulated signal comprises the following steps: performing addition operation on the left sideband signal and the right sideband signal to obtain a digital addition signal, wherein the digital addition signal comprises a real part signal and an imaginary part signal; converting the digital addition signal into the analog signal by using a digital-to-analog converter; inputting the analog signal into the I / Q modulator, using the real part signal as an I path modulation signal and using the imaginary part signal as a Q path modulation signal, and modulating an optical carrier signal generated by an external cavity laser to obtain the modulated signal.

4. The method of claim 3, wherein, The method for inputting an analog signal into an I / Q modulator, using a real part signal as an I path modulation signal and using an imaginary part signal as a Q path modulation signal, and modulating an optical carrier signal generated by an external cavity laser to obtain a modulated signal comprises the following steps: dividing the optical carrier signal generated by the external cavity laser into a first optical signal and a second optical signal with the same frequency and the same power by using a power divider in the I / Q modulator; modulating the first optical signal by using a first Mach-Zehnder modulator in the I / Q modulator according to the real part signal to obtain an I path modulation signal; According to the imaginary part signal, a second Mach-Zehnder modulator in the I / Q modulator is used to modulate the second optical signal to obtain a reference optical signal, and a 90° phase modulator in the I / Q modulator is used to perform phase modulation on the reference optical signal to obtain a Q-channel modulation signal; An optical coupler in the I / Q modulator is used to couple the I-channel modulation signal and the Q-channel modulation signal to obtain the modulated signal.

5. The method of claim 1, wherein, The modulated signal is subjected to PD detection, and the signal after PD detection is subjected to filtering operation to obtain a target SSB signal, including: The modulated signal is input into a PD detection device to obtain a plurality of detection signals; A preset frequency is obtained; According to the preset frequency, the plurality of detection signals are subjected to the filtering operation to obtain the target SSB signal.

6. An SSB signal generating apparatus characterized by comprising: Including: A digital signal processing unit is configured to generate a first pseudo-random binary sequence and a second pseudo-random binary sequence, and modulate the first pseudo-random binary sequence and the second pseudo-random binary sequence to obtain a PS-GS4QAM baseband signal and a QPSK baseband signal, wherein the first pseudo-random binary sequence and the second pseudo-random binary sequence have the same length; The digital signal processing unit is further configured to perform a preprocessing operation on the PS-GS4QAM baseband signal and the QPSK baseband signal respectively to obtain a left sideband signal corresponding to the PS-GS4QAM baseband signal and a right sideband signal corresponding to the QPSK baseband signal, and add the left sideband signal and the right sideband signal and input them into a digital-to-analog converter, wherein the frequency corresponding to the left sideband signal is not equal to the frequency corresponding to the right sideband signal; The digital signal processing unit comprises: a first acquisition unit configured to acquire a carrier signal with a frequency of and a carrier signal with a frequency of ; an up-sampling unit configured to up-sample the PS-GS 4QAM baseband signal and the QPSK baseband signal; a raised cosine shaping unit configured to perform raised cosine shaping on the PS-GS 4QAM baseband signal and the QPSK baseband signal; and a first modulation unit configured to modulate the carrier signal with a frequency of to obtain a left sideband signal, and modulate the carrier signal with a frequency of to obtain a right sideband signal. A digital-to-analog converter is configured to convert a signal input into the digital-to-analog converter to obtain an analog signal, and input the analog signal into an I / Q modulator, wherein the analog signal includes a real part signal and an imaginary part signal, the real part signal is used as an I-channel modulation signal, and the imaginary part signal is used as a Q-channel modulation signal; An I / Q modulator is configured to modulate an optical carrier signal generated by an external cavity laser according to the real part signal and the imaginary part signal to obtain a modulated signal; A detection unit is configured to perform PD detection on the modulated signal, and perform filtering operation on the signal after PD detection to obtain a target SSB signal.

7. A computer readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to make a computer execute the SSB signal generation method in any one of claims 1-5.

8. An electronic device, comprising: The electronic device includes at least one processor and a memory connected with the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to make the at least one processor execute the SSB signal generation method in any one of claims 1-5.

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