Signal processing system and method

Abstract

The invention provides a signal processing system and method, and relates to the technical field of wireless communication, I / Q two-path sampling and modulation are carried out through a control module, I-path SPWM and Q-path SPWM are obtained, and the sampling efficiency of data signals is improved. Independent amplification processing and frequency mixing processing are carried out on the I-path SPWM and the Q-path SPWM through the power amplifier module, and the frequency spectrum utilization rate of data signals is improved. The target radio frequency signal generated by the method and the device is high in anti-frequency selective fading capability, the bandwidth of each sub-channel is relatively narrow, so that the target radio frequency signal can be regarded as flat fading, inter-symbol interference is reduced, the anti-fading capability of the target radio frequency signal is enhanced, and the method and the device can adapt to various applications.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular to a signal processing system and method. Background Art

[0002] Existing maritime communication transmitters mainly provide navigation safety, piracy, search and rescue, weather information, navigation, port information, ship traffic system file transmission, electronic chart update package and other message broadcast transmission for ships at sea. The signal processing system is the core part of the maritime communication transmitter, which mainly completes functions such as signal processing, modulation, message storage, and networking application. The traditional signal processing system consists of RF module, signal processing module, control module, power module, etc. The RF module is responsible for RF input and RF output. The signal processing module is responsible for signal processing, modulation and demodulation. The control module is responsible for the control of the whole machine, external interface resource management, message processing and networking and other functions. The power module mainly completes the AC / DC (Alternating Current / Direct Current) conversion to provide a stable DC power supply for the business unit.

[0003] The signal processing system of the existing maritime communication transmitter only supports Phase Shift Keying (PSK) modulation. PSK modulation requires complex circuits to implement, which increases its cost in practical applications. PSK modulation is easily affected by phase distortion during high-speed transmission, which may lead to a decrease in signal quality. PSK modulation may be affected by time delay and phase shift, which reduces the transmission quality of the signal. PSK requires more time to transmit signals, and its transmission rate is relatively slow.

[0004] From the above, it can be seen that the signal processing effect of the existing signal processing system is poor. Summary of the invention

[0005] The present invention provides a signal processing system, which is used to solve the defect of poor signal processing effect of the signal processing system in the prior art and improve the signal processing effect of the signal processing system.

[0006] The invention provides a signal processing system, comprising: a control module, a power amplifier module and a synthesis filter module; the control module is used for generating an in-phase sinusoidal pulse width modulation signal I-channel SPWM and an orthogonal sinusoidal pulse width modulation signal Q-channel SPWM according to a received data signal, and generating a Cosωt carrier SPWM and a Sinωt carrier SPWM according to a system reference clock signal; the power amplifier module is used for amplifying the I-channel SPWM to obtain an amplified I-channel SPWM; amplifying the Q-channel SPWM to obtain an amplified Q-channel SPWM; mixing the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mixing the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; the synthesis filter module is used for performing power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal.

[0007] According to the signal processing system provided by the present invention, the power amplifier module includes a first switching amplifier tube, a second switching amplifier tube, a third switching amplifier tube and a fourth switching amplifier tube: the first switching amplifier tube is used to amplify the I-channel SPWM to obtain the amplified I-channel SPWM; the second switching amplifier tube is used to amplify the Q-channel SPWM to obtain the amplified Q-channel SPWM; the third switching amplifier tube is used to mix the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; the fourth switching amplifier tube is used to mix the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal.

[0008] According to the signal processing system provided by the present invention, the control module also includes an optical module: the optical module is used to convert the I-channel SPWM into an electrical signal for the first switching amplifier to amplify the I-channel SPWM; the optical module is also used to convert the Q-channel SPWM into an electrical signal for the second switching amplifier to amplify the Q-channel SPWM; the optical module is also used to convert the SPWM of the Cosωt carrier into an electrical signal for the third switching amplifier to perform mixing; the optical module is also used to convert the SPWM of the Sinωt carrier into an electrical signal for the fourth switching amplifier to perform mixing.

[0009] According to the signal processing system provided by the present invention, the signal processing system also includes a power supply module; the control module is also used to control the power supply module to provide a DC voltage signal to the first switching amplifier tube, so that the first switching amplifier tube amplifies the I-way SPWM according to the DC voltage signal to obtain the amplified I-way SPWM; the control module is also used to control the power supply module to provide a DC voltage signal to the second switching amplifier tube, so that the second switching amplifier tube amplifies the Q-way SPWM according to the DC voltage signal to obtain the amplified Q-way SPWM.

[0010] According to the signal processing system provided by the present invention, the power amplifier module also includes a first low-pass filter and a second low-pass filter; the first low-pass filter is used to filter the amplified I-way SPWM, and send the filtered amplified I-way SPWM to the third switching amplifier; the second low-pass filter is used to filter the amplified Q-way SPWM, and send the filtered amplified Q-way SPWM to the fourth switching amplifier.

[0011] According to the signal processing system provided by the present invention, at least one of the first switching amplifier tube, the second switching amplifier tube, the third switching amplifier tube and the fourth switching amplifier tube is a gallium nitride switching amplifier tube.

[0012] According to the signal processing system provided by the present invention, the synthesis and filtering module includes a power synthesizer and a bandpass filter: the power synthesizer is used to perform power synthesis on the in-phase RF signal and the orthogonal RF signal to obtain an initial RF signal; the bandpass filter is used to filter the initial RF signal to obtain a target RF signal.

[0013] According to the signal processing system provided by the present invention, the signal processing system also includes an antenna tuning module and an antenna, and the antenna tuning module is connected to the synthesis filter module: the antenna tuning module is used to adjust the energy of the target RF signal so that the adjusted target RF signal matches the antenna; the antenna is used to transmit the adjusted target RF signal.

[0014] According to the signal processing system provided by the present invention, the control module further includes a clock generator, and the clock generator is used to provide a system reference clock signal.

[0015] The present invention also provides a signal processing method, which is applied to the above-mentioned signal processing system, including: a control module generates an I-channel SPWM and a Q-channel SPWM according to a received data signal, and generates an SPWM of a Cosωt carrier and an SPWM of a Sinωt carrier according to a system reference clock signal; a power amplifier module amplifies the I-channel SPWM to obtain an amplified I-channel SPWM; amplifies the Q-channel SPWM to obtain an amplified Q-channel SPWM; mixes the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mixes the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; and a synthesis filter module performs power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal.

[0016] According to the signal processing method provided by the present invention, a control module generates an I-channel SPWM and a Q-channel SPWM according to a received data signal, including: decoding the data signal to obtain an I-channel signal and a Q-channel signal; resampling and quantizing the I-channel signal to obtain an I-channel characteristic signal, and converting the I-channel characteristic signal into an I-channel SPWM according to a triangular wave of a fixed frequency; resampling and quantizing the Q-channel signal to obtain a Q-channel characteristic signal, and converting the Q-channel characteristic signal into a Q-channel SPWM according to a triangular wave of a fixed frequency.

[0017] According to the signal processing system provided by the present invention, the data signal is an orthogonal frequency division multiplexing OFDM baseband signal, the data signal includes a data block, each data block includes a plurality of data frames, each data frame includes a first subframe and a second subframe, the first subframe and the second subframe both include a channel and a preamble, the preamble includes a preamble X, a preamble Y and a preamble Z, the preamble X is used to identify the first subframe of other data frames in the data block except the first data frame, the preamble Y is used to identify the second subframe, and the preamble Z is used to identify the first subframe of the first data frame of the data block.

[0018] The signal processing system and method provided by the present invention include: a control module, a power amplifier module and a synthesis filter module; the control module is used to generate an in-phase sinusoidal pulse width modulation signal I-way SPWM and an orthogonal sinusoidal pulse width modulation signal Q-way SPWM according to a received data signal, and generate a Cosωt carrier SPWM and a Sinωt carrier SPWM according to a system reference clock signal; the power amplifier module is used to amplify the I-way SPWM to obtain an amplified I-way SPWM; amplify the Q-way SPWM to obtain an amplified Q-way SPWM; mix the amplified I-way SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mix the amplified Q-way SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; the synthesis filter module is used to perform power synthesis of the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal. The control module performs I / Q two-way sampling and modulation to obtain the I-way SPWM and the Q-way SPWM, thereby improving the sampling efficiency of the data signal. The I-channel SPWM and Q-channel SPWM are independently amplified and mixed by the power amplifier module, thereby improving the spectrum utilization of the data signal. The target radio frequency signal generated by the present invention has a strong ability to resist frequency selective fading. Since the bandwidth of each subchannel is relatively narrow, it can be regarded as flat fading, which reduces inter-symbol interference, enhances the anti-fading ability of the target radio frequency signal, and can adapt to a variety of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is one of the flow charts of the signal processing method provided by the present invention.

[0021] Figure 2 It is a schematic diagram of the generation process of the OFDM baseband signal provided by the present invention.

[0022] Figure 3 It is a structural schematic diagram of the signal processing system provided by the present invention.

[0023] Figure 4 It is a structural schematic diagram of the ZYNQ chip of the main control board provided by the present invention.

[0024] Figure 5 This is the second flowchart of the signal processing method provided by the present invention.

[0025] Figure 6 It is a schematic diagram of a data block of an OFDM baseband signal provided by the present invention.

[0026] Figure 7 It is a schematic diagram of the generation process of the target radio frequency signal provided by the present invention.

[0027] Figure 8 It is a schematic diagram of the communication between the Ethernet transceiver chip and the cable provided by the present invention.

[0028] Fig. 9 It is a schematic diagram of the communication between the Ethernet transceiver chip and the optical module provided by the present invention.

[0029] Fig.10 It is a schematic diagram of the software architecture of the signal processing system provided by the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Combine the following Figure 1-Figure 10 The signal processing system and method of the present invention are described.

[0032] Figure 1 Schematic diagram of the structure of the signal processing system provided by the present invention. Figure 1 As shown, a signal processing system includes: a control module, a power amplifier module and a synthesis filter module.

[0033] The control module is used to generate an in-phase sinusoidal pulse width modulation signal I SPWM and an orthogonal sinusoidal pulse width modulation signal Q SPWM according to the received data signal, and to generate a Cosωt carrier SPWM and a Sinωt carrier SPWM according to the system reference clock signal.

[0034] The power amplifier module is used to amplify the I-channel SPWM to obtain an amplified I-channel SPWM; amplify the Q-channel SPWM to obtain an amplified Q-channel SPWM; mix the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mix the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal.

[0035] The synthesis filter module is used to perform power synthesis on the in-phase RF signal and the orthogonal RF signal to obtain the target RF signal.

[0036] The control module also includes an internal modulator for receiving a data signal sent by the internal modulator. The internal modulator also includes a pilot generation unit, an orthogonal frequency division multiplexing (OFDM) mapping unit and an OFDM baseband generation unit. The data signal includes an OFDM baseband signal.

[0037] like Figure 2 As shown, the internal modulator performs energy diffusion and channel coding on the multiple input signal (MIS), the time input signal (TIS), the digital signal (DS) or the signal generated by the pilot generator and inputs it to the OFDM mapper of the internal modulator. The OFDM mapping unit can perform OFDM framing mapping on the signal generated by the MIS, TIS, DS or pilot generation unit to obtain an initial OFDM baseband signal. The initial OFDM baseband signal generates an OFDM baseband signal through the OFDM baseband generator of the internal modulator.

[0038] The control module modulates the OFDM baseband signal. From the frequency domain, the OFDM baseband signal is composed of multiple subcarriers. From the time domain, the OFDM baseband signal is divided into multiple OFDM symbols by time. One OFDM unit is equivalent to the modulated signal within one OFDM symbol time on one subcarrier. The maximum bandwidth of the OFDM baseband signal is 10kHz.

[0039] Optionally, the OFDM baseband signal can also be obtained through an external modulator.

[0040] The OFDM baseband signal uses I / Q modulation to divide the OFDM baseband signal into I-channel signal and Q-channel signal and transmit it to the signal processing system, such as the transmitter. I / Q modulation is a technology that converts the signal from the baseband to a high-frequency carrier. I stands for in-phase and Q stands for quadrature. During the I / Q modulation process, the original signal is mapped to a two-dimensional rectangular coordinate system to form in-phase and quadrature components. These components are modulated with the carrier signal to achieve spectrum shifting.

[0041] The control module obtains the I-channel signal and the Q-channel signal in the OFDM baseband signal (data signal). The control module performs Fourier transform on the I-channel signal to obtain the I-channel sinusoidal pulse width modulation signal (SPWM). The control module performs Fourier transform on the Q-channel signal to obtain the Q-channel SPWM. Similarly, the control module generates two subcarrier SPWMs with a phase difference of 90° according to the system reference clock signal of the signal processing system, for example, the SPWM of the Cosωt carrier and the SPWM of the Sinωt carrier; wherein the frequency of the subcarrier SPWM includes 500kHz.

[0042] The I-channel SPWM, Q-channel SPWM, SPWM of the Cosωt carrier, and SPWM of the Sinωt carrier are converted into electrical signals through the optical fiber module and sent to the power amplifier module. The power amplifier module amplifies the I-channel SPWM and the Q-channel SPWM respectively to obtain the amplified I-channel SPWM and the amplified Q-channel SPWM. The amplified I-channel SPWM and the amplified Q-channel SPWM are both 10K bandwidth high-voltage signals. The power amplifier module mixes the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase RF signal. The power amplifier module mixes the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal RF signal. Both the in-phase RF signal and the orthogonal RF signal are high-power RF signals.

[0043] The in-phase RF signal and the orthogonal RF signal are power synthesized through a synthesis filter module to obtain the final target RF signal.

[0044] The signal processing system provided by the present invention comprises: a control module, a power amplifier module and a synthesis filter module; the control module is used to generate an in-phase sinusoidal pulse width modulation signal I-way SPWM and an orthogonal sinusoidal pulse width modulation signal Q-way SPWM according to a received data signal, and generate a Cosωt carrier SPWM and a Sinωt carrier SPWM according to a system reference clock signal; the power amplifier module is used to amplify the I-way SPWM to obtain an amplified I-way SPWM; amplify the Q-way SPWM to obtain an amplified Q-way SPWM; mix the amplified I-way SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mix the amplified Q-way SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; the synthesis filter module is used to perform power synthesis of the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal. The control module performs I / Q two-way sampling and modulation to obtain the I-way SPWM and the Q-way SPWM, thereby improving the sampling efficiency of the data signal. The I-channel SPWM and Q-channel SPWM are independently amplified and mixed by the power amplifier module, thereby improving the spectrum utilization of the data signal. The target radio frequency signal generated by the present invention has a strong ability to resist frequency selective fading. Since the bandwidth of each subchannel is relatively narrow, it can be regarded as flat fading, which reduces inter-symbol interference, enhances the anti-fading ability of the target radio frequency signal, and can adapt to a variety of applications.

[0045] In one embodiment, the power amplifier module includes a first switch amplifier, a second switch amplifier, a third switch amplifier, and a fourth switch amplifier. The first switch amplifier is used to amplify the I-channel SPWM to obtain the amplified I-channel SPWM; the second switch amplifier is used to amplify the Q-channel SPWM to obtain the amplified Q-channel SPWM; the third switch amplifier is used to mix the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; the fourth switch amplifier is used to mix the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal.

[0046] In one embodiment, the control module also includes an optical module: the optical module is used to convert the I-channel SPWM into an electrical signal for the first switching amplifier to amplify the I-channel SPWM; the optical module is also used to convert the Q-channel SPWM into an electrical signal for the second switching amplifier to amplify the Q-channel SPWM; the optical module is also used to convert the SPWM of the Cosωt carrier into an electrical signal for the third switching amplifier to perform mixing; the optical module is also used to convert the SPWM of the Sinωt carrier into an electrical signal for the fourth switching amplifier to perform mixing.

[0047] In one embodiment, at least one of the first switching amplifier tube, the second switching amplifier tube, the third switching amplifier tube and the fourth switching amplifier tube is a gallium nitride switching amplifier tube.

[0048] The first switch amplifier tube, the second switch amplifier tube, the third switch amplifier tube and the fourth switch amplifier tube form a full bridge circuit. Figure 1 As shown, the full-bridge circuit of the power amplifier module includes a first gallium nitride switching amplifier tube, a second gallium nitride switching amplifier tube, a third gallium nitride switching amplifier tube and a fourth gallium nitride switching amplifier tube.

[0049] The main control board of the control module communicates with the power amplifier module and the combined filter module through the optical module. Optical fiber communication has the advantages of large transmission capacity, small transmission loss, long relay time, good confidentiality, and strong anti-interference ability. The optical fiber in the optical module is the physical transmission medium of the optical signal. Its characteristics directly affect the bandwidth and transmission distance of the optical fiber transmission system. At present, optical fibers with different characteristics have been developed to suit different applications. There is a light source at the transmitting end of the optical module. A light emitting diode or a semiconductor laser can be used to generate a light pulse signal under the action of an electrical pulse. A photodiode is used as a light detector at the receiving end of the optical module, and an electrical pulse can be restored when a light pulse is detected.

[0050] The model of the optical module connected to the main control board in the present invention can be FTAF-B1312-40I, which has an LC optical interface, is powered by +5VDC (direct current voltage), has a light source pulser with a wavelength of 1310nm, uses 1X9 packaging, a metal shielding shell, a TTL (transistor-transistor logic) burst data interface, and has a maximum operating rate of 1.25Gb / s.

[0051] The I-way SPWM is converted into an electrical signal through an optical module, and the electrical signal controls the opening and closing of the first gallium nitride switch amplifier tube, thereby converting the DC voltage signal flowing through the first gallium nitride switch amplifier tube into a high-frequency switch signal, and obtaining the amplified I-way SPWM. For example, the amplified I-way SPWM is a high-voltage signal with a bandwidth of 10kHz. Similarly, the Q-way SPWM is converted into an electrical signal through an optical module, and the electrical signal controls the opening and closing of the second gallium nitride switch amplifier tube, thereby converting the DC voltage signal flowing through the second gallium nitride switch amplifier tube into a high-frequency switch signal, and obtaining the amplified Q-way SPWM. For example, the amplified Q-way SPWM is a high-voltage signal with a bandwidth of 10kHz. The amplified I-way SPWM and the SPWM of the Cosωt carrier are mixed through the third gallium nitride switch amplifier tube to obtain an in-phase RF signal. The amplified Q-way SPWM and the SPWM of the Sinωt carrier are mixed through the fourth gallium nitride switch amplifier tube to obtain an orthogonal RF signal. The frequency of the SPWM of the Cosωt carrier and the SPWM of the Sinωt carrier can be 500kHz.

[0052] The present invention realizes independent amplification of I-way SPWM and Q-way SPWM by forming a first half-bridge circuit with a first switch amplifier and a second switch amplifier. The third switch amplifier and a fourth switch amplifier form a second half-bridge circuit, which realizes mixing of the amplified I-way SPWM and the SPWM of the Cosωt carrier, and mixing of the amplified Q-way SPWM and the SPWM of the Sinωt carrier. The gallium nitride switch amplifier of the present invention improves the amplification efficiency of the SPWM signal.

[0053] In one embodiment, the signal processing system also includes a power supply module; the control module is also used to control the power supply module to provide a DC voltage signal to the first switching amplifier tube, so that the first switching amplifier tube amplifies the I-way SPWM according to the DC voltage signal to obtain the amplified I-way SPWM; the control module is also used to control the power supply module to provide a DC voltage signal to the second switching amplifier tube, so that the second switching amplifier tube amplifies the Q-way SPWM according to the DC voltage signal to obtain the amplified Q-way SPWM.

[0054] The control module controls the power supply module to output a DC voltage signal of fixed strength, for example, the strength range of the DC voltage signal is 50V-250V. The DC voltage signal of fixed strength is supplied to the first GaN switch amplifier and the second GaN switch amplifier respectively. The amplitude of the amplified I-way SPWM and the amplified Q-way SPWM is determined by the strength of the DC voltage signal. When the DC voltage signal is 250V, it is a high power output, and when the DC voltage signal is 50V, it is a minimum power output. The signal wave of the high-power amplified I-way SPWM is as follows: Figure 1 shown.

[0055] The present invention controls the power supply module through the control module to provide a DC voltage signal to the first switching amplifier tube and the second switching amplifier tube, thereby realizing the control of the amplification strength of the I-way SPWM and the Q-way SPWM.

[0056] In one embodiment, the power amplifier module also includes a first low-pass filter and a second low-pass filter; the first low-pass filter is used to filter the amplified I-channel SPWM, and send the filtered amplified I-channel SPWM to the third switching amplifier; the second low-pass filter is used to filter the amplified Q-channel SPWM, and send the filtered amplified Q-channel SPWM to the fourth switching amplifier.

[0057] The amplified I-channel SPWM and the amplified Q-channel SPWM are both high-frequency switching signals, and the high-frequency switching signals are filtered by the first low-pass filter or the second low-pass filter.

[0058] The present invention performs filtering through the first low-pass filter and the second low-pass filter, thereby improving the signal quality of the amplified I-channel SPWM and the amplified Q-channel SPWM, and is beneficial to improving the efficiency of subsequent frequency mixing.

[0059] In one embodiment, the synthesis and filtering module includes a power synthesizer and a bandpass filter: the power synthesizer is used to perform power synthesis on the in-phase RF signal and the orthogonal RF signal to obtain an initial RF signal; the bandpass filter is used to filter the initial RF signal to obtain a target RF signal.

[0060] The received in-phase RF signal and the orthogonal RF signal are power synthesized by a power synthesizer, and the synthesized initial RF signal is filtered by a bandpass filter to obtain a target RF signal.

[0061] The present invention performs power synthesis and filtering on an in-phase radio frequency signal and an orthogonal radio frequency signal through a power synthesizer and a bandpass filter, thereby improving the quality of a target radio frequency signal.

[0062] In one embodiment, the signal processing system further includes an antenna tuning module and an antenna, wherein the antenna tuning module is connected to the synthesis filter module: the antenna tuning module is used to adjust the energy of the target RF signal so that the adjusted target RF signal matches the antenna; the antenna is used to transmit the adjusted target RF signal.

[0063] An antenna tuning module is provided between the antenna and the synthesis filter module to achieve energy adjustment of the target RF signal, which is beneficial to improving the protection of the signal processing system.

[0064] In one embodiment, the control module further includes a clock generator, and the clock generator is used to provide a system reference clock signal.

[0065] The control module obtains the system reference clock signal through the clock generator, compares the system reference clock signal with the fixed-frequency triangle wave, and generates two 500kHz carrier SPWM signals with a phase difference of 90°, namely the SPWM of the Cosωt carrier and the SPWM of the Sinωt carrier.

[0066] For example, the clock generator is a 100MHz temperature compensated crystal oscillator.

[0067] The present invention realizes accurate and efficient acquisition of system reference clock signals through a clock generator.

[0068] Further, such as Figure 3As shown, the control module of the present invention includes an internal modulator (the control module itself generates a modulation signal), a main control board, a power board, a panel and a back panel. The main control board includes a business network port, a chip of the main control board, a management network port, a radio frequency sampling unit, a first level conversion unit, a power supply RS232 serial port (serial interface), an RS422 serial port (serial interface), a second level conversion unit, an audio codec (for example, ES8388), a storage unit (including 4GB of DDR3 and EMMC), a first DC power converter (including DC-DCLT4644), a temperature compensated crystal oscillator, a debugging serial port (serial interface), an RS433 serial port and multiple optical modules. The business network port is connected to an external modulator (receiving an external modulation signal) through a Fast Ethernet General Interface (Reduced Gigabit Media Independent Interface, RGMII) to achieve interaction with the network control center. The management network port is used for debugging. The radio frequency sampling unit receives radio frequency signals through a GPIO (general input and output) interface. The first level conversion unit is used to receive digital audio signals. The audio codec is used to receive analog audio signals. The power serial port is used to connect the power module (for example, a 250V power supply to provide a 50-250V DC voltage signal to the power amplifier unit). The RS422 serial port is used to connect the power amplifier module and the synthesis filter module. The second level conversion unit is used to connect the antenna tuning module.

[0069] The power board includes a second DC power converter (for converting 24V voltage to 5V voltage) and a power filter. The panel includes a power switch indicator light, multiple independent buttons, and an RGB screen.

[0070] The functions of the control module include: realizing the external network port interface function and supporting the remote power on / off function. Controlling the signal processing system to set the working parameters, receiving and reporting the working status of the whole machine. Generate RF signals, such as generating up-converted 500kHz RF signals. Sample the input analog audio. Sample the input RF signal. Sample the input digital audio data. Control the power amplifier module to adjust the power output of the power amplifier unit. Control the combined filter module to detect the forward and reverse power. Control the power module to collect the power consumption status of the whole machine of the signal processing system.

[0071] For example, the control module uses a 24V DC input for power supply. After the 24V enters the power board, it is first filtered, and then a second DC power converter is used to convert the 24V DC into 5V DC and input it into the main control board. The power switch of the control module is installed on the panel. When the switch is pressed, the switch signal is transmitted to the main control board via the data line, and the main control board controls the power board to complete the start of the control module.

[0072] When using remote start, the terminal software is connected to the control module via a network cable, and the control module is started through the network port command. After the control module is turned on, it will self-check whether other modules (including synthesis filter module, power amplifier module, power module, antenna tuning module) are online and display them on the interface. The default working state of the control module is standby state.

[0073] The main function of the panel is to display the working status of the current control module, such as real-time power, real-time voltage and current, real-time temperature, whether it is connected to the control center, etc. And change the setting parameters of the current control module, such as network port IP address, transmission power level and other parameters.

[0074] The main control board is the control center of the entire control module. The main functions of the main control board include: (1) Supporting 100M Ethernet interface with 2 independent IPs; (2) Supporting 2 RS232 serial ports and 3 RS422 serial ports; (3) Supporting display RGB888 interface; (4) Supporting 8 independent key interfaces; (5) Supporting multi-channel optical fiber interface (6) Supporting digital audio input interface; (7) Supporting analog audio input interface. (8) Supporting RF input interface. (9) Supporting real-time clock system. (10) Supporting key destruction when there is no external power supply, which is used to destroy the key confidentially, without power supply, and one-click triggering. The main input and output signal indicators of the main control board are shown in Table 1.

[0075] Table 1 Main input and output signal indicators of the main control board

[0076] High-speed LVDS signals are high-speed low-voltage differential signal transmission signals. GPIO signals are general-purpose input and output signals. TTL levels are based on transistor-transistor logic (TTL) levels. IO stands for input / output. Recommended Standard (RS) 232 and RS422 are serial communication standards. Open Collector (OC) gate interface is a logic gate interface using open-drain output.

[0077] In order to achieve stability, reliability, low cost and low power consumption of the main control board in the control module, the main control board is mainly composed of core circuits, power circuits, network port circuits, double data rate (DDR) circuits, interface circuits and other circuits.

[0078] The chip of the main control board can adopt the ZYNQ series programmable fusion chip. The ZYNQ chip integrates the processing system (PS) based on the quad-core high-performance processor with rich features and programmable logic (PL) in a single chip. The process technology is based on the 28nm High-k MetalGate Plus Process (28nmHOC+). Through multiple data interfaces and the helm interconnection control system signal, the PS and PL can be tightly coupled together. The ZYNQ chip can easily realize the mapping of user software and hardware logic to the on-chip PS system and PL programmable logic. Compared with the traditional central processing unit (CPU) plus field programmable gate array (FPGA) two-chip solution, the ZYNQ chip integrates the CPU and FPGA on a single chip, which can greatly improve the system performance, and the overall chip area is smaller and the power consumption is lower. The ZYNQ chip has a quad-core processor, 32K bytes of instruction cache and 32K bytes of data cache (32KB I / D), 256KB of L2 cache, and the chip system includes on-chip memory, high-speed external memory interface DDR3, high-speed pass interface USB and Gigabit Ethernet, universal memory interface and rich standard peripheral interfaces. DDR3 memory can meet a large number of high-speed data storage needs.

[0079] FPGA programmable logic provides up to 350K logic resources, which can meet the needs of user-defined interface and system design. The chip uses a high-performance Adaptive Multi-Channel Video Architecture (AMVA) bus to connect the processor, memory, rudder peripherals and editable logic.

[0080] FPGA supports high-performance IO technology, digitally controlled impedance, and can be used for the lowest power consumption high-speed I / O operation in tri-state. It provides 25X18 width binary multipliers and accumulators, which can achieve up to 48-bit high-resolution signal processing functions. The high-performance transceiver rate can reach up to 12.5Gbps, 12-bit analog to digital converter, and sampling rate up to 1Msps.

[0081] The structure of the ZYNQ chip is as follows Figure 4As shown. The input and output (I / O) units of the ZYNQ chip include: Controller Area Network (CAN) interface, Serial Peripheral Interface (SPI), Inter-Integrated Circuit (I2C) interface, Gigabit Ethernet (GigE) interface, Universal Asynchronous Receiver-Transmitter (UART) interface, Secure Digital Card (SD) interface, Secure Digital Input Output (SDIO) interface, Universal Serial Bus (USB) interface. The I / O module realizes various forms of data interaction through the above interfaces.

[0082] The ZYNQ chip also includes a Multi-Function Input / Output (MIO) unit. The ZYNQ chip also includes on-chip memory (OCM), static random-access memory NOR (SRAM NOR), 8-channel direct memory access (DMA 8 Channel), 32KB instruction / data cache (32KB I / D), triple timer counter (TTC), software watchdog timer (SWDT), hardware watchdog timer (AWDT), sniffing (Snoop) controller, Generic Interrupt Controller (GIC), Interrupt Request Output (IRO) interface, Critical System Unit (CSU), Configuration (CONFIG), Extended Multi-function Input / Output (EMIO), Analog to Digital Converter (ADC), ONFI 1.0 NAND flash memory, Quad SPI Controller (Q-SPI) CTRL). ZYNQ chips also include high-speed interfaces and general interfaces.

[0083] The main functions and interfaces provided by the ZYNQ chip include: (1) a hard-core 32-bit quad-core high-performance processor with an operating speed of 1.9DMIPS / MHz; (2) 100 / 1000 Mbps Ethernet driver, USB 2.0 high-speed interface; (3) SRAM / NOR FLASH controller, Nand Flash controller; (4) DDR3 random dynamic memory interface, online arbitration mechanism to prevent data blocking and loss; (5) Quadn-SPI controller, SD / SDIO controller, supporting slave or master device functions; (6) 2 CAN bus controllers, 2 UART serial port control controllers, and 2 I2C controllers; (7) 54 independent PS MIOs, supporting 2 sets of Bank voltages.

[0084] The main control board uses two different network ports (business network port and management network port). The business network port uses SK21101 as the Ethernet transceiver chip, which supports 10 / 100 / 1000Mbps. The Ethernet transceiver chip provides physical layer functions for 10 Mbps baseband Ethernet twisted pair (10BASE-Te), 100BASE-T and 1000BASE-T Ethernet that complies with the IEEE802.3 standard. It transmits and receives Ethernet data through standard enhanced Category 5 unshielded twisted pair (CAT5.EUTP) cables.

[0085] Based on advanced DSP technology and analog front-end AFE technology, SK21101 integrates crossover detection and automatic correction, polarity correction, adaptive equalization, crosstalk elimination, echo cancellation, timing recovery and error correction functions to provide powerful 10 Mbps, 100Mbps, 1000Mbps data transmission and reception functions.

[0086] SK21101 supports connecting the media access control layer (MAC) with the physical layer (PHY) through the Reduced Gigabit Media Independent Interface (RGMII) or the Serial Gigabit Media Independent Architecture (SGMII), providing 100BASE-Te, 100BASE-T and 1000BASE-T data transmission. The Ethernet transceiver chip supports 3.3V2.5V and 1.8V RGMII I / O voltages. The Ethernet transceiver chip provides a serializer (e.g., SerDes) interface that can be configured as SGMII, 1000BASE-T or 100BASE-FX mode.

[0087] like Figure 8 As shown in the figure, the Ethernet transceiver chip supports the MDI pin extended range protocol and provides X-Range 100M mode ultra-long distance transmission. This function requires the connection partner to also support X-Range 100M mode, which supports 400 meters of enhanced Category 5 cable (CAT.5e) cable transmission at a rate of 100Mbps. Fig. 9 As shown, the Ethernet transceiver chip also supports connecting to an optical module through a SerDes interface.

[0088] The panel of the present invention uses a 4-inch organic light-emitting diode (OLED) display screen to display the status information of the whole machine. The display screen driver uses the Little Graphics Library (LVGL) library, which is an open source Graphical User Interface (GUI) library with low resource consumption, high portability, and advanced graphics effects, including animation, anti-aliasing, transparency, and smooth movement. It supports multiple input devices and supports 8-bit variable length character encoding (UTF-8) encoding in multiple languages. Graphic elements can be fully customized. It supports accelerated GUI design, and there are a large number of tutorials, cases, themes, and materials for reference.

[0089] The signal processing system of the present invention can be a transmitter of a medium wave signal transmitting device, adopts a high-performance operating system, and the software mainly realizes functions such as human-computer interaction, remote control, parameter loading, status reporting, software upgrade, self-checking and protection, filtering processing, up-conversion, power amplifier control and standing wave detection.

[0090] The software architecture design of the signal processing system includes modular and object-oriented design ideas. The functions of each software module are highly cohesive and low-coupled, which reduces the dependency between software modules and makes the software modules easy to reuse, easy to expand functions, and easy to maintain codes. Based on this, its software configuration items can be divided into three parts: display and control software, main control software, and field-programmable gate array (FPGA) software.

[0091] like Fig.10 As shown, the functional allocation of each software configuration item is described as follows. (1) The display and control software runs on the main control board of the control module, mainly realizing the human-computer interaction of the transmitter equipment, completing the interface presentation, parameter configuration, system management, status monitoring and other functions through the display panel; and exchanging information with the main control software. (2) The main control software runs on the main control board of the control module, mainly realizing the information collection of the signal processing system (for example, status information collection and reporting), protocol adaptation, message management (including self-test, parameter storage, status management), general interface management and other functions; and exchanging information with the display and control software and FPGA software. (3) The FPGA software runs on the excitation board of the excitation unit, mainly realizing up-conversion, AD (analog-to-digital conversion) / DA (digital-to-analog conversion), signal modulation and other functions; and exchanging information with the main control software. It realizes the control of the power amplifier module and the power supply module, collects and reports the status information of each power amplifier module, and adapts the interface protocol; and exchanging information with the main control software. Among them, the excitation board includes an internal modulator for generating the internal modulation signal of the signal processing system, and the internal modulation signal is used to subsequently generate the OFDM baseband signal.

[0092] like Figure 5As shown, the present invention further provides a signal processing method, which is applied to the above-mentioned signal processing system, and includes steps S100 to S300, and each step is specifically described as follows.

[0093] S100: The control module generates an I-channel SPWM and a Q-channel SPWM according to the received data signal, and generates an SPWM of a Cosωt carrier and an SPWM of a Sinωt carrier according to a system reference clock signal.

[0094] The control module obtains the I-channel signal and the Q-channel signal in the OFDM baseband signal (data signal). The control module performs Fourier transform on the I-channel signal to obtain the I-channel sinusoidal pulse width modulation signal (SPWM). The control module performs Fourier transform on the Q-channel signal to obtain the Q-channel SPWM. Similarly, the control module generates two subcarrier SPWMs with a phase difference of 90° according to the system reference clock signal of the signal processing system, for example, the SPWM of the Cosωt carrier and the SPWM of the Sinωt carrier; wherein the frequency of the subcarrier SPWM includes 500kHz.

[0095] S200: The power amplifier module amplifies the I-channel SPWM to obtain an amplified I-channel SPWM; amplifies the Q-channel SPWM to obtain an amplified Q-channel SPWM; mixes the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase RF signal; mixes the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal RF signal.

[0096] The I-channel SPWM, Q-channel SPWM, SPWM of the Cosωt carrier, and SPWM of the Sinωt carrier are converted into electrical signals through the optical fiber module and sent to the power amplifier module. The power amplifier module amplifies the I-channel SPWM and the Q-channel SPWM respectively to obtain the amplified I-channel SPWM and the amplified Q-channel SPWM. The power amplifier module mixes the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain the in-phase RF signal. The power amplifier module mixes the amplified Q-channel SPWM and the SPWM of the Sinωt carrier to obtain the orthogonal RF signal. Both the in-phase RF signal and the orthogonal RF signal are high-power RF signals.

[0097] S300: The synthesis filter module performs power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal.

[0098] like Figure 7 As shown, the in-phase RF signal and the orthogonal RF signal are power synthesized through the synthesis filter module to obtain the final target RF signal. The formula for signal mixing and power synthesis is as follows.

[0099] ; in, is the target RF signal, For I-channel SPWM, For Q-way SPWM, is the SPWM of Cosωt carrier, It is SPWM of Sinωt carrier.

[0100] The signal processing method provided by the present invention performs I / Q two-way sampling and modulation through a control module to obtain I-way SPWM and Q-way SPWM, thereby improving the sampling efficiency of data signals. The I-way SPWM and Q-way SPWM are independently amplified and mixed by a power amplifier module, thereby improving the spectrum utilization of data signals. The target radio frequency signal generated by the present invention has a strong ability to resist frequency selective fading. Since the bandwidth of each subchannel is relatively narrow, it can be regarded as flat fading, which reduces inter-symbol interference, enhances the anti-fading ability of the target radio frequency signal, and can adapt to a variety of applications.

[0101] Based on the above embodiment, the control module generates an I-channel SPWM and a Q-channel SPWM according to the received data signal, including the following steps: decoding the data signal to obtain an I-channel signal and a Q-channel signal; resampling and quantizing the I-channel signal to obtain an I-channel characteristic signal, and converting the I-channel characteristic signal into an I-channel SPWM according to a triangular wave of a fixed frequency; resampling and quantizing the Q-channel signal to obtain a Q-channel characteristic signal, and converting the Q-channel characteristic signal into a Q-channel SPWM according to a triangular wave of a fixed frequency.

[0102] The data signal includes an OFDM baseband signal. The OFDM baseband signal is decoded to obtain an independent I-channel signal and a Q-channel signal. After the I-channel signal is independently resampled and quantized, it is compared with a fixed-frequency triangle wave to obtain an I-channel SPWM. After the Q-channel signal is independently resampled and quantized, it is compared with a fixed-frequency triangle wave to obtain a Q-channel SPWM.

[0103] The present invention decodes the data signal to obtain independent I-channel signals and Q-channel signals, and performs independent amplification and mixing processing on the I-channel SPWM and the Q-channel SPWM, thereby improving the spectrum utilization of the data signal.

[0104] Based on the above embodiment, the data signal is an orthogonal frequency division multiplexing OFDM baseband signal, the data signal includes a data block, each data block includes multiple data frames, each data frame includes a first subframe and a second subframe, the first subframe and the second subframe both include a channel and a preamble, the preamble includes a preamble X, a preamble Y and a preamble Z, the preamble X is used to identify the first subframe of other data frames in the data block except the first data frame, the preamble Y is used to identify the second subframe, and the preamble Z is used to identify the first subframe of the first data frame of the data block.

[0105] The OFDM baseband signal is sent from the modulator to the control module, and the OFDM baseband signal is transmitted between the modulator and the control module in the form of AES digital audio. The three standard sampling frequencies of AES digital audio are 32kHz, 44.1kHz, and 48kHz. The modulator of the present invention uses 44.1kHz synchronous audio between the transmitter. It provides audio data of 2 channels at the same time, and the quantization accuracy is mostly 20 bits or 24 bits. It can not only transmit mono or stereo audio information separately, but also can be accompanied by a clock reference signal and related auxiliary information.

[0106] like Figure 6 As shown, a data signal, such as audio data, exists in the form of a channel pair. The data signal includes multiple data blocks, each data block includes multiple data frames (for example, 192 data frames constitute a data block). Each data frame includes a first subframe and a second subframe, and the subframe (first subframe and second subframe) is the smallest unit in the audio encoding and packaging process. There are 32 time slots in a subframe, and the first four time slots 0-3 contain 3 preambles. The first subframe and the second subframe both include channels and preambles including preamble X, preamble Y and preamble Z. Preamble X is used to identify the first subframe of other data frames in the data block except the first data frame, preamble Y is used to identify the second subframe, and preamble Z is used to identify the first subframe of the first data frame of the data block (for example, an audio block). Preamble Z represents the start mark of the transmission of the first data frame in a data block consisting of 192 data frames, and each data block appears once and only once.

[0107] The function of the preamble of the present invention is to identify and synchronize data blocks, data frames and subframes. AES audio uses bi-phase mark coding, while the preamble uses a special coding method different from bi-phase mark coding to eliminate the state of similar preamble data. In this way, the confusion caused by similar data replacing the preamble and causing data error packaging is eliminated. The stability and security of data transmission are improved.

[0108] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0109] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal processing system, characterized in that: include: Control module, power amplifier module and synthesis filter module; The control module is used to generate an in-phase sinusoidal pulse width modulation signal I-way SPWM and an orthogonal sinusoidal pulse width modulation signal Q-way SPWM according to the received data signal, and to generate a Cosωt carrier SPWM and a Sinωt carrier SPWM according to the system reference clock signal; The power amplifier module is used to amplify the I-channel SPWM to obtain an amplified I-channel SPWM; Amplifying the Q-path SPWM to obtain an amplified Q-path SPWM; Mixing the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; Mixing the amplified Q-path SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; The synthesis filter module is used to perform power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal.

2. The signal processing system according to claim 1, characterized in that The power amplifier module includes a first switch amplifier tube, a second switch amplifier tube, a third switch amplifier tube and a fourth switch amplifier tube: The first switch amplifier is used to amplify the I-channel SPWM to obtain the amplified I-channel SPWM; The second switch amplifier is used to amplify the Q-path SPWM to obtain the amplified Q-path SPWM; The third switch amplifier is used to mix the amplified I-channel SPWM and the SPWM of the Cosωt carrier to obtain the in-phase radio frequency signal; The fourth switch amplifier is used to mix the amplified Q-path SPWM and the SPWM of the Sinωt carrier to obtain the orthogonal radio frequency signal.

3. The signal processing system according to claim 2, characterized in that The control module also includes an optical module: The optical module is used to convert the I-channel SPWM into an electrical signal so that the first switch amplifier tube can amplify the I-channel SPWM; The optical module is also used to convert the Q-channel SPWM into an electrical signal so that the second switch amplifier tube can amplify the Q-channel SPWM; The optical module is also used to convert the SPWM of the Cosωt carrier into an electrical signal for the third switch amplifier to perform frequency mixing; The optical module is also used to convert the SPWM of the Sinωt carrier into an electrical signal for the fourth switch amplifier to perform frequency mixing.

4. The signal processing system according to claim 2, characterized in that The signal processing system also includes a power supply module; The control module is further used to control the power supply module to provide a DC voltage signal to the first switch amplifier, so that the first switch amplifier amplifies the I-channel SPWM according to the DC voltage signal to obtain the amplified I-channel SPWM; The control module is further used to control the power supply module to provide the DC voltage signal to the second switch amplifier tube, so that the second switch amplifier tube amplifies the Q-path SPWM according to the DC voltage signal to obtain the amplified Q-path SPWM.

5. The signal processing system according to claim 2, characterized in that: The power amplifier module also includes a first low-pass filter and a second low-pass filter; The first low-pass filter is used to filter the amplified I-channel SPWM, and send the filtered amplified I-channel SPWM to the third switch amplifier; The second low-pass filter is used to filter the amplified Q-path SPWM, and send the filtered amplified Q-path SPWM to the fourth switch amplifier.

6. The signal processing system according to any one of claims 2 to 5, characterized in that: At least one of the first switching amplifier tube, the second switching amplifier tube, the third switching amplifier tube and the fourth switching amplifier tube is a gallium nitride switching amplifier tube.

7. The signal processing system according to any one of claims 1 to 5, characterized in that: The synthesis and filtering module includes a power synthesizer and a bandpass filter: The power synthesizer is used to perform power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain an initial radio frequency signal; The bandpass filter is used to filter the initial radio frequency signal to obtain the target radio frequency signal.

8. The signal processing system according to any one of claims 1 to 5, characterized in that: The signal processing system further includes an antenna tuning module and an antenna, wherein the antenna tuning module is connected to the synthesis filter module: The antenna tuning module is used to adjust the energy of the target radio frequency signal so that the adjusted target radio frequency signal matches the antenna; The antenna is used to transmit the adjusted target radio frequency signal.

9. The signal processing system according to any one of claims 1 to 5, characterized in that: The control module further includes a clock generator, which is used to provide the system reference clock signal.

10. A signal processing method, characterized in that: A signal processing system as claimed in any one of claims 1 to 9, comprising: The control module generates the I-channel SPWM and the Q-channel SPWM according to the received data signal, and generates the SPWM of the Cosωt carrier and the SPWM of the Sinωt carrier according to the system reference clock signal; The power amplifier module amplifies the I-way SPWM to obtain an amplified I-way SPWM; amplifies the Q-way SPWM to obtain an amplified Q-way SPWM; mixes the amplified I-way SPWM and the SPWM of the Cosωt carrier to obtain an in-phase radio frequency signal; mixes the amplified Q-way SPWM and the SPWM of the Sinωt carrier to obtain an orthogonal radio frequency signal; The synthesis filter module performs power synthesis on the in-phase radio frequency signal and the orthogonal radio frequency signal to obtain a target radio frequency signal.

11. The signal processing method according to claim 10, characterized in that: The control module generates the I-way SPWM and the Q-way SPWM according to the received data signal, including: Decoding the data signal to obtain an I-channel signal and a Q-channel signal; Resampling and quantizing the I-channel signal to obtain an I-channel characteristic signal, and converting the I-channel characteristic signal into the I-channel SPWM according to a triangular wave of a fixed frequency; The Q-path signal is resampled and quantized to obtain a Q-path characteristic signal, and the Q-path characteristic signal is converted into the Q-path SPWM according to the fixed-frequency triangle wave.

12. The signal processing method according to claim 10, characterized in that: The data signal is an orthogonal frequency division multiplexing OFDM baseband signal, the data signal includes a data block, each of the data blocks includes a plurality of data frames, each of the data frames includes a first subframe and a second subframe, the first subframe and the second subframe both include a channel and a preamble, the preamble includes a preamble X, a preamble Y and a preamble Z, the preamble X is used to identify the first subframe of other data frames in the data block except the first data frame, the preamble Y is used to identify the second subframe, and the preamble Z is used to identify the first subframe of the first data frame of the data block.

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