A multi-source data switching device for a microwave laser composite system

Abstract

This invention discloses a multi-source data switching device for a microwave-laser composite system, belonging to the field of communication and data transmission. The device includes a transmission frame generation unit, a channel coding unit, a rate matching unit, an interleaving mapping unit, a symbol mapping unit, a shaping filter unit, an interpolation data synthesis unit, an interpolation data cyclic storage unit, an interpolation coefficient storage unit, an address cyclic accumulation unit, a weighted summation unit, and a low-pass filter unit. Based on the operating states of the laser and microwave links, this invention controls the generation and filling of the microwave link transmission signals and the laser link transmission signals through the rate matching unit, realizing flexible switching of multi-source data in the microwave-laser composite system and improving the overall transmission performance of the system.

Description

Technical Field

[0001] This invention relates to the field of communication and data transmission, and is particularly suitable for use as a multi-source data generation and switching system in satellite microwave laser composite systems. Background Technology

[0002] Satellite-to-ground data transmission includes telemetry, data transmission, distance, velocity, and angle data. In traditional microwave-laser hybrid systems, microwave and laser link data are transmitted independently. The laser link has a high transmission rate and can transmit high-bandwidth signals such as data transmission, while the microwave link has a low transmission rate and can transmit traditional telemetry, distance, velocity, and angle data. Because the microwave and laser links transmit data independently, if either the microwave or laser link malfunctions, the corresponding data transmission will stop, resulting in low system transmission efficiency. Furthermore, during independent transmission between the microwave and laser links, to ensure data transmission effectiveness, the link transmission rates of the microwave and laser links will be higher than their corresponding data transmission rates. The traditional approach is to insert idle frames to match the data transmission rate with the link transmission rate, which further reduces system transmission efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a multi-source data switching device for a microwave laser composite system. This invention also features high reliability, high stability, and low implementation complexity.

[0004] The objective of this invention is achieved as follows:

[0005] A multi-source data switching device for a microwave-laser composite system includes a transmission frame generation unit 1, a channel coding unit 2, a rate matching unit 3, a laser link data processing branch, and a microwave link data processing branch.

[0006] The transmission frame generation unit 1 is used to generate laser link data reception enable signal and microwave link data reception enable signal, and to receive laser link data and microwave link data, and then transmit the laser link data and microwave link data to the channel coding unit 2.

[0007] Channel coding unit 2 performs channel coding on each group of microwave link data and each group of laser link data, and transmits the processed microwave link data and laser link data to rate matching unit 3.

[0008] The rate matching unit 3 controls the transmission of microwave link data and laser link data through multiple working modes, and transmits the microwave link data and laser link data to the laser link data processing branch and the microwave link data processing branch respectively.

[0009] The laser link data processing branch and the microwave link data processing branch process the laser link data and microwave link data respectively, and output the corresponding modulation signals.

[0010] Furthermore, the operation mode of the transmission frame generation unit 1 is as follows:

[0011] The transmission frame generation unit 1 generates a laser link data reception enable signal and a microwave link data reception enable signal respectively. When both enable signals are valid, it starts to receive the data to be transmitted from the laser link and the data to be transmitted from the microwave link respectively. When the laser link data reception enable signal is invalid, the laser link data source stops sending the data to be transmitted. When the microwave link data reception enable signal is invalid, the microwave link data source stops sending the data to be transmitted.

[0012] The transmission frame generation unit 1 groups the two types of data to be transmitted received according to a unified frame format, adds a corresponding frame count to the front of each group of data, and transmits the framed data to the channel coding unit 2.

[0013] Furthermore, the channel coding unit 2 operates as follows:

[0014] Channel coding unit 2 performs channel coding on each group of microwave link data and each group of laser link data, fills the corresponding data group with the generated check bits, and fills the data group with a frame header. The laser link data and microwave link data use different frame headers for filling.

[0015] Channel coding unit 2 transmits the processed microwave link data and laser link data to rate matching unit 3 respectively.

[0016] Furthermore, the rate matching unit 3 has four operating modes:

[0017] In the first operating mode, when both the laser link and the microwave link are in normal working condition, the rate matching unit 3 generates the idle frame position of the laser link based on the relationship between the data rate to be transmitted in the laser link and the signal rate to be transmitted in the laser link, and fills the idle frame position of the laser link with the microwave link to be transmitted at the current moment; at the same time, the rate matching unit 3 generates the idle frame position of the microwave link based on the relationship between the data rate to be transmitted in the microwave link and the signal rate to be transmitted in the microwave link, and fills the idle frame position of the microwave link with the laser link to be transmitted at the current moment.

[0018] In the second working mode, when the microwave link transmission is normal but the laser link transmission is abnormal, the rate matching unit 3 generates a microwave link idle frame indication signal in advance based on the relationship between the microwave link data rate to be transmitted and the microwave link transmission signal rate, and transmits the microwave link idle frame indication signal to the transmission frame generation unit 1. After receiving the microwave link idle frame indication signal, the transmission frame generation unit 1 generates a set of laser link transmission data. After the set of laser link transmission data is processed by the channel coding unit 2, it is transmitted to the rate matching unit 3. The rate matching unit 3 fills the corresponding idle frame position of the microwave link with this set of laser link transmission data.

[0019] In the third working mode, when the microwave link transmission is abnormal while the laser link transmission is normal, the rate matching unit 3 generates a microwave link valid frame indication signal in advance based on the relationship between the data rate to be transmitted in the microwave link and the signal rate transmitted in the laser link. The microwave link valid frame indication signal is then transmitted to the transmission frame generation unit 1. After receiving the microwave link valid frame indication signal, the transmission frame generation unit 1 continuously generates multiple sets of microwave link transmission data. When the transmission frame generation unit 1 does not receive the microwave link valid frame indication signal, it continuously generates multiple sets of laser link transmission data. After the microwave link transmission data and the laser link transmission data are framed and channel coded, they are transmitted to the rate matching unit 3 respectively. The rate matching unit 3 fills the laser link with the continuous transmission data frame composed of the microwave link transmission data frame and the laser link transmission data frame for data transmission.

[0020] In the fourth working mode, when both the microwave link and the laser link are in an abnormal state, the rate matching unit 3 controls the transmission frame generation unit 1 to generate idle frames for microwave link transmission and idle frames for laser link transmission, ensuring the continuity of the transmission signals of the microwave link and the laser link.

[0021] Furthermore, both the laser link data processing branch and the microwave link data processing branch include interleaving mapping units 4-1 and 4-2, symbol mapping units 5-1 and 5-2, shaping filtering units 6-1 and 6-2, interpolation data synthesis units 7-1 and 7-2, interpolation data cyclic storage units 8-1 and 8-2, interpolation coefficient storage units 9-1 and 9-2, address cyclic accumulation units 10-1 and 10-2, weighted summation units 11-1 and 11-2, and low-pass filtering units 12-1 and 12-2.

[0022] Interleaving mapping units 4-1 and 4-2 receive the data stream to be modulated frame by frame, and according to the current modulation scheme, in the order of the bit data stream input, the bit data stream is interleaved frame by frame according to the correspondence between the current modulation scheme and the number of bit data, and the data is interleaved by serial-to-parallel conversion in a sequential queueing manner, and the data interleaved mapping signal is transmitted to symbol mapping units 5-1 and 5-2.

[0023] Symbol mapping units 5-1 and 5-2 perform modulation symbol mapping on the received data interleaving mapping signal according to the current modulation scheme, and generate I / Q two-channel digital baseband signals after symbol mapping, which are then transmitted to shaping filter units 6-1 and 6-2.

[0024] Shaping filter units 6-1 and 6-2 perform shaping filter processing on the input I / Q digital baseband signals to generate I / Q digital baseband signals with 4 times sampling, which are then transmitted to interpolation data synthesis units 7-1 and 7-2.

[0025] Interpolation data synthesis units 7-1 and 7-2 receive I / Q dual-channel digital baseband signals sampled at 4 times. Starting with the current input signal, they combine the current input signal with the three adjacent previously input signals to generate a combined signal. The combined signal is then output to interpolation data cyclic storage units 8-1 and 8-2.

[0026] Interpolation data cyclic storage units 8-1 and 8-2 receive the data reading address generated by address cyclic accumulation units 10-1 and 10-2, read the corresponding combined signal according to the data reading address, and output it to weighted summation units 11-1 and 11-2.

[0027] Interpolation coefficient storage units 9-1 and 9-2 receive the interpolation filter coefficient reading addresses generated by address loop accumulation units 10-1 and 10-2. Based on the interpolation filter coefficient reading addresses, they output a corresponding set of filter combination coefficients and output them to weighted summation units 11-1 and 11-2. Each set of filter combination coefficients contains 4 filter coefficients.

[0028] The weighted summation units 11-1 and 11-2 treat the four filter coefficients as weighted values ​​of the four data in the combined signal, complete the weighted summation operation of the filter combination coefficients and the combined signal, and output the signal after the operation to the low-pass filter units 12-1 and 12-2.

[0029] Low-pass filtering units 12-1 and 12-2 perform low-pass filtering on the signals from weighted summing units 11-1 and 11-2 to complete signal modulation and output.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. This invention uses a fully digital method to generate laser link transmission baseband signals and microwave link transmission baseband signals in an integrated manner, which improves the flexibility and adaptability of the system.

[0032] 2. Based on the working status of the laser link and the microwave link, this invention controls the generation and filling of the microwave link transmission signal and the laser link transmission signal through a rate matching unit, thereby realizing flexible switching of multi-source data in the microwave-laser composite system and improving the overall transmission performance of the system.

[0033] 3. This invention achieves integrated generation of signals with different data rates from laser and microwave links through shaping filtering, interpolation filtering, and low-pass filtering design, thereby reducing the complexity of system design. Attached Figure Description

[0034] Figure 1 This is a schematic diagram illustrating the principle of the present invention. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] A multi-source data switching device for a microwave laser composite system, referenced Figure 1 It includes a transmission frame generation unit 1, a channel coding unit 2, a rate matching unit 3, interleaving mapping units 4-1 to 4-2, symbol mapping units 5-1 to 5-2, shaping filtering units 6-1 to 6-2, interpolation data synthesis units 7-1 to 7-2, interpolation data cyclic storage units 8-1 to 8-2, interpolation coefficient storage units 9-1 to 9-2, address cyclic accumulation units 10-1 to 10-2, weighted summation units 11-1 to 11-2, and low-pass filtering units 12-1 to 12-2.

[0037] The device first generates laser link data reception enable signals and microwave link data reception enable signals respectively by transmission frame generation unit 1. When both enable signals are valid, it starts receiving data to be transmitted via laser link and microwave link respectively. When the laser link data reception enable signal is invalid, the laser link data source stops sending data to be transmitted. When the microwave link data reception enable signal is invalid, the microwave link data source stops sending data to be transmitted. Transmission frame generation unit 1 groups the two types of data to be transmitted according to a unified frame format and adds a corresponding frame count to the front of each group of data. Transmission frame generation unit 1 transmits the framed data to be transmitted to channel coding unit 2.

[0038] Channel coding unit 2 performs channel coding on each group of microwave link transmission data and each group of laser link transmission data, and fills the corresponding data group with the generated check bits. At the same time, it fills the data group with a frame header. Here, different frame headers are selected for filling the data frames to be transmitted in the laser link and microwave link. Channel coding unit 2 transmits the processed microwave link data frames and laser link data frames to rate matching unit 3 respectively.

[0039] Rate matching unit 3 has four operating modes:

[0040] In the first working mode, when both the laser link and the microwave link are in normal working condition, the rate matching unit 3 generates the laser link idle frame transmission position based on the rate relationship between the data rate to be transmitted in the laser link and the signal rate to be transmitted in the laser link, and fills the laser link idle frame position with the microwave link idle frame to be transmitted at the current moment. At the same time, the rate matching unit 3 generates the microwave link idle frame position based on the rate relationship between the data rate to be transmitted in the microwave link and the signal rate to be transmitted in the microwave link, and fills the microwave link idle frame position with the laser link idle frame to be transmitted at the current moment.

[0041] In the second operating mode, when the microwave link transmission is normal but the laser link transmission is abnormal, the rate matching unit 3 generates a microwave link idle frame indication signal in advance based on the rate relationship between the data rate to be transmitted in the microwave link and the signal rate transmitted in the microwave link. This signal is then transmitted to the transmission frame generation unit 1. Upon receiving a valid microwave link idle frame indication signal, the transmission frame generation unit 1 generates a set of laser link transmission data. This set of data is processed by the channel coding unit 2 and then transmitted to the rate matching unit 3. The rate matching unit 3 fills this set of laser link transmission data into the corresponding idle frame position of the microwave link. This is equivalent to using the idle frame time slot of the microwave link transmission to perform continuous low-speed transmission or frame-picking transmission of the laser link data, thereby ensuring the continuity and flexibility of laser link data transmission.

[0042] In the third operating mode, when the microwave link transmission is abnormal while the laser link transmission is normal, the rate matching unit 3 generates a valid microwave link frame indication signal in advance based on the rate relationship between the data rate to be transmitted in the microwave link and the signal rate transmitted in the laser link. This signal is then transmitted to the transmission frame generation unit 1. When the transmission frame generation unit 1 receives a valid microwave link frame indication signal, it continuously generates multiple sets of microwave link transmission data. When the transmission frame generation unit 1 receives an invalid microwave link frame indication signal, it continuously generates multiple sets of laser link transmission data. After framing and channel coding processing, the microwave link transmission data and the laser link transmission data are transmitted to the rate matching unit 3. The rate matching unit 3 fills the laser link with a continuous transmission data frame composed of the microwave link transmission data frame and the laser link transmission data frame for data transmission. This is equivalent to using the laser link to transmit all the microwave link data and using the remaining transmission time slots to transmit the original laser link data at a reduced speed. Since the laser link transmission data rate is much higher than the microwave link transmission data rate, the reduction in the laser link transmission data rate is relatively small, while ensuring the integrity of the microwave link data transmission.

[0043] In the fourth operating mode, when both the microwave link and laser link transmissions are in an abnormal state, the rate matching unit 3 controls the transmission frame generation unit 1 to generate idle frames for both the microwave and laser links. This ensures the continuity of signal transmission between the microwave and laser links and reduces the difficulty of establishing the data transmission status for both links. The rate matching unit 3 then transmits the processed microwave and laser link data to the interleaving mapping units 4-1 and 4-2, respectively.

[0044] Interleaving mapping unit 4-1 receives the microwave link data stream to be modulated frame by frame, and according to the current modulation scheme, in the order of bit data stream input, performs data interleaving mapping frame by frame according to the correspondence between the current modulation scheme and the number of bit data, and completes the data interleaving mapping by sequentially queuing the serial-to-parallel conversion method, and transmits the data interleaving mapping signal to symbol mapping unit 5-1.

[0045] Symbol mapping unit 5-1 modulates the received data interleaving mapping signal according to the current modulation scheme, generates the symbol-mapped microwave link I / Q digital baseband signal, and transmits the signal to shaping filter unit 6-1.

[0046] The shaping filter unit 6-1 performs shaping filtering on the input I / Q baseband signals respectively, generates I / Q baseband signals with 4 times sampling, and transmits the signals to the interpolation data synthesis unit 7-1 respectively.

[0047] The interpolation data synthesis unit 7-1 receives the digital signal output by the shaping filter, and starting with the current input signal, sequentially combines the three adjacent input signals to generate a combined signal of four input signals as a group, and outputs the combined signal to the interpolation data cyclic storage unit 8-1.

[0048] The interpolation data cyclic storage unit 8-1 receives the data read address generated and output by the address cyclic accumulation unit 10-1, and outputs the stored combination signal corresponding to the currently received data read address.

[0049] The interpolation coefficient storage unit 9-1 receives the address cyclic accumulation unit, which generates and outputs the interpolation filter coefficient read address and outputs the filter combination coefficients corresponding to the current receiving address. Each group of output filter combination coefficients contains 4 filter coefficients.

[0050] The weighted summation unit 11-1 receives the combined signal output from the interpolation data loop storage unit 8-1 and the filter combination coefficients output from the interpolation coefficient storage unit 9-1. It then uses the four filter coefficients in the filter combination coefficients as the weights of the four data points in the combined signal, completes the weighted summation operation of the filter combination coefficients and the combined signal, and outputs the calculated signal to the low-pass filter unit 12-1.

[0051] The low-pass filter unit 12-1 performs low-pass filtering on the input signal and outputs it. The signal output by the low-pass filter unit 12-1 is transmitted to the subsequent microwave link modulation unit, and finally the modulation and output of the microwave link signal are completed.

[0052] Interleaving mapping unit 4-2 receives the laser link data stream to be modulated frame by frame, and according to the current modulation scheme, in the order of bit data stream input, performs data interleaving mapping frame by frame according to the correspondence between the current modulation scheme and the number of bit data, and completes the data interleaving mapping by sequentially queuing the serial-to-parallel conversion method, and transmits the data interleaving mapping signal to symbol mapping unit 5-2.

[0053] Symbol mapping unit 5-2 modulates the received data interleaving mapping signal according to the current modulation scheme, generates the symbol-mapped microwave link I / Q digital baseband signal, and transmits the signal to shaping filter unit 6-2.

[0054] The shaping filter unit 6-2 performs shaping filter processing on the input I / Q baseband signals respectively, generates I / Q baseband signals with 4 times sampling, and transmits the signals to the interpolation data synthesis unit 7-2 respectively.

[0055] The interpolation data synthesis unit 7-2 receives the digital signal output by the shaping filter, and starting with the current input signal, combines the three adjacent input signals in sequence to generate a combined signal of four input signals as a group, and outputs the combined signal to the interpolation data cyclic storage unit 8-2.

[0056] The interpolation data cyclic storage unit 8-2 receives the data read address generated and output by the address cyclic accumulation unit 10-2, and outputs the stored combination signal corresponding to the currently received data read address.

[0057] The interpolation coefficient storage unit 9-2 receives the address of the interpolation filter coefficient reading unit, and outputs the filter combination coefficients corresponding to the current receiving address. Each group of output filter combination coefficients contains 4 filter coefficients.

[0058] The weighted summation unit 11-2 receives the combined signal output from the interpolation data loop storage unit 8-2 and the filter combination coefficients output from the interpolation coefficient storage unit 9-2. It then uses the four filter coefficients in the filter combination coefficients as the weights of the four data points in the combined signal, completes the weighted summation operation of the filter combination coefficients and the combined signal, and outputs the calculated signal to the low-pass filter unit 12-2.

[0059] The low-pass filter unit 12-2 performs low-pass filtering on the input signal and outputs it. The signal output by the low-pass filter unit 12-2 is transmitted to the subsequent laser link modulation unit, and finally the modulation and output of the laser link signal are completed.

[0060] Through the above process, the device realizes the generation and switching of multi-source data in the microwave laser composite system.

[0061] In a specific embodiment, the transmission frame generation unit 1, channel coding unit 2, rate matching unit 3, interleaving mapping units 4-1 to 4-2, symbol mapping units 5-1 to 5-2, shaping filtering units 6-1 to 6-2, interpolation data synthesis units 7-1 to 7-2, interpolation data cyclic storage units 8-1 to 8-2, interpolation coefficient storage units 9-1 to 9-2, address cyclic accumulation units 10-1 to 10-2, weighted summation units 11-1 to 11-2, and low-pass filtering units 12-1 to 12-2 can all be implemented using Virtex7 FPGA.

[0062] This invention employs a fully digital, integrated method to generate both laser and microwave link baseband signals, improving the system's flexibility and adaptability. Based on the operating states of the laser and microwave links, this invention controls the generation and filling of the microwave and laser link transmission signals through a rate matching unit, enabling flexible switching of multi-source data in the microwave-laser composite system and improving the overall transmission performance. Furthermore, through shaping filtering, interpolation filtering, and low-pass filtering, this invention achieves integrated generation of signals with different data rates for the laser and microwave links, reducing the complexity of system design.

Claims

1. A multi-source data switching device for a microwave laser composite system, characterized in that, It includes a transmission frame generation unit (1), a channel coding unit (2), a rate matching unit (3), a laser link data processing branch, and a microwave link data processing branch; The transmission frame generation unit (1) is used to generate laser link data reception enable signal and microwave link data reception enable signal, and receive laser link data and microwave link data, and then transmit the laser link data and microwave link data to the channel coding unit (2). The channel coding unit (2) performs channel coding on each group of microwave link data and each group of laser link data, and transmits the processed microwave link data and laser link data to the rate matching unit (3). The rate matching unit (3) controls the transmission of microwave link data and laser link data through multiple operating modes, and transmits the microwave link data and laser link data to the laser link data processing branch and the microwave link data processing branch, respectively; the rate matching unit (3) has four operating modes: In the first working mode, when both the laser link and the microwave link are in normal working condition, the rate matching unit (3) generates the idle frame position of the laser link according to the relationship between the data rate to be transmitted in the laser link and the signal rate to be transmitted in the laser link, and fills the idle frame position of the laser link with the microwave link to be transmitted at the current moment; at the same time, the rate matching unit (3) generates the idle frame position of the microwave link according to the relationship between the data rate to be transmitted in the microwave link and the signal rate to be transmitted in the microwave link, and fills the idle frame position of the microwave link with the laser link to be transmitted at the current moment. In the second working mode, when the microwave link transmission is normal but the laser link transmission is abnormal, the rate matching unit (3) generates a microwave link idle frame indication signal in advance according to the relationship between the microwave link data rate to be transmitted and the microwave link transmission signal rate, and transmits the microwave link idle frame indication signal to the transmission frame generation unit (1). After receiving the microwave link idle frame indication signal, the transmission frame generation unit (1) generates a set of laser link transmission data. After the set of laser link transmission data is processed by the channel coding unit (2), it is transmitted to the rate matching unit (3). The rate matching unit (3) fills this set of laser link transmission data into the corresponding idle frame position of the microwave link. In the third working mode, when the microwave link transmission is abnormal while the laser link transmission is normal, the rate matching unit (3) generates a microwave link valid frame indication signal in advance based on the relationship between the microwave link data rate to be transmitted and the laser link transmission signal rate, and transmits the microwave link valid frame indication signal to the transmission frame generation unit (1). After receiving the microwave link valid frame indication signal, the transmission frame generation unit (1) continuously generates multiple sets of microwave link transmission data. When the transmission frame generation unit (1) does not receive the microwave link valid frame indication signal, it continuously generates multiple sets of laser link transmission data. After the microwave link transmission data and the laser link transmission data are framed and channel coded respectively, they are transmitted to the rate matching unit (3). The rate matching unit (3) fills the laser link with the continuous transmission data frame composed of the microwave link transmission data frame and the laser link transmission data frame for data transmission. In the fourth working mode, when both the microwave link and the laser link are in an abnormal state, the rate matching unit (3) controls the transmission frame generation unit (1) to generate microwave link transmission idle frames and laser link transmission idle frames to ensure the continuity of the transmission signals of the microwave link and the laser link. The laser link data processing branch and the microwave link data processing branch process the laser link data and microwave link data respectively, and output the corresponding modulation signals.

2. The multi-source data switching device for a microwave laser composite system according to claim 1, characterized in that, The operation mode of the transmission frame generation unit (1) is as follows: The transmission frame generation unit (1) generates a laser link data receiving enable signal and a microwave link data receiving enable signal respectively. When both enable signals are valid, it starts to receive the laser link data to be transmitted and the microwave link data to be transmitted respectively. When the laser link data receiving enable signal is invalid, the laser link data source stops sending the data to be transmitted. When the microwave link data receiving enable signal is invalid, the microwave link data source stops sending the data to be transmitted. The transmission frame generation unit (1) groups the two types of data to be transmitted received according to a unified frame format, adds a corresponding frame count to the front end of each group of data, and transmits the framed data to the channel coding unit (2).

3. The multi-source data switching device for a microwave laser composite system according to claim 1, characterized in that, The channel coding unit (2) operates as follows: The channel coding unit (2) performs channel coding on each group of microwave link data and each group of laser link data, fills the corresponding data group with the generated check bits, and fills the data group with a frame header. The laser link data and microwave link data use different frame headers for filling. The channel coding unit (2) transmits the processed microwave link data and laser link data to the rate matching unit (3) respectively.

4. The multi-source data switching device for a microwave laser composite system according to claim 1, characterized in that, Both the laser link data processing branch and the microwave link data processing branch include an interleaving mapping unit (4-1, 4-2), a symbol mapping unit (5-1, 5-2), a shaping filter unit (6-1, 6-2), an interpolation data synthesis unit (7-1, 7-2), an interpolation data cyclic storage unit (8-1, 8-2), an interpolation coefficient storage unit (9-1, 9-2), an address cyclic accumulation unit (10-1, 10-2), a weighted summation unit (11-1, 11-2), and a low-pass filter unit (12-1, 12-2). Interleaving mapping units (4-1, 4-2) receive the data stream to be modulated frame by frame, and according to the current modulation scheme, in the order of the bit data stream input, perform data interleaving mapping frame by frame by performing serial-to-parallel conversion in a sequentially queued manner according to the correspondence between the current modulation scheme and the number of bit data. The data interleaving mapping signal is then transmitted to symbol mapping units (5-1, 5-2). The symbol mapping unit (5-1, 5-2) modulates the received data interleaving mapping signal according to the current modulation scheme, generates the symbol-mapped I / Q digital baseband signals, and transmits them to the shaping filter unit (6-1, 6-2). The shaping filter unit (6-1, 6-2) performs shaping filter processing on the input I / Q digital baseband signals to generate I / Q digital baseband signals with 4 times sampling, which are then transmitted to the interpolation data synthesis unit (7-1, 7-2). The interpolation data synthesis unit (7-1, 7-2) receives I / Q dual digital baseband signals sampled at 4 times. Starting with the current input signal, it combines the current input signal with the three adjacent previously input signals to generate a combined signal. The combined signal is then output to the interpolation data cyclic storage unit (8-1, 8-2). The interpolation data cyclic storage unit (8-1, 8-2) receives the data read address generated by the address cyclic accumulation unit (10-1, 10-2), reads the corresponding combined signal according to the data read address, and outputs it to the weighted summation unit (11-1, 11-2). The interpolation coefficient storage unit (9-1, 9-2) receives the interpolation filter coefficient read address generated by the address loop accumulation unit (10-1, 10-2), and outputs a set of filter combination coefficients corresponding to the interpolation filter coefficient read address, and outputs them to the weighted summation unit (11-1, 11-2). Each set of filter combination coefficients contains 4 filter coefficients. The weighted summation unit (11-1, 11-2) treats the four filter coefficients as the weights of the four data in the combined signal, completes the weighted summation operation of the filter combination coefficients and the combined signal, and outputs the processed signal to the low-pass filter unit (12-1, 12-2). The low-pass filtering unit (12-1, 12-2) performs low-pass filtering on the signal from the weighted summation unit (11-1, 11-2) to complete the modulation and output of the signal.

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