CN103179068A - Space-borne high-order modulation device - Google Patents

Abstract

The invention provides a satellite-borne high-order modulation device which comprises a conversion module, two modulators, a shunt, a phase shifter and a combiner, wherein the conversion module is used for converting input serial data into parallel data; the two modulators are respectively connected with the conversion module; one of the two modulators is connected with the shunt through the phase shifter; the other of the two modulators is directly connected with the shunt and is used for modulating input information; the shunt is used for shunting a local oscillation signal into multiple paths and respectively transmitting the multiple paths of signal to the two modulators; the phase shifter is used for lagging the phase of the local oscillation signal; and the combiner is connected with the two modulators respectively and is used for adding the two input signals so as to output modulation information. According to the device in the embodiment, the data is converted through a quadrature phase shift keying (QPSK) modulator, the modulated data is lagged and added so as to obtain the modulation information, and high-order data modulation is realized; and moreover, the complexity of an implementation mode in a digital communication system is reduced, the digital/analog conversion is avoided, and the reliability of the system is improved.

Description

Space-borne high-order modulation device

technical field

The invention relates to the field of satellite communication, in particular to a satellite-borne high-order modulation device.

Background technique

With the continuous development of communication technology, people have higher and higher requirements on the speed and efficiency of data transmission. At present, satellite data transmission generally adopts QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) modulation method. In order to achieve higher communication rate and more efficient bandwidth utilization, it is necessary to adopt high-order modulation methods, such as 8PSK (8Phase Shift Keying, eight phase shift keying) and QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), etc. Under the same bandwidth, compared with QPSK modulation, 8PSK can achieve 1.5 times the communication rate, 16QAM can achieve 2 times the communication rate, and 64QAM can achieve 3 times the communication rate.

In the existing implementation of high-order modulation, the input data needs to be digital-to-analog conversion first, and then the subsequent processing, but the conversion accuracy of the digital-to-analog conversion module is not high, and the conversion result will directly affect the final modulation performance. Therefore, limited by the accuracy of digital-to-analog conversion, existing methods for realizing high-order modulation have poor scalability and low flexibility. In addition, when implementing a higher-order modulation mode, the nonlinear working mode of the digital-to-analog conversion module will easily affect the modulation performance, and will greatly increase the complexity of system implementation.

Contents of the invention

The object of the present invention is to solve at least one of the above-mentioned technical drawbacks.

In order to achieve the above purpose, an embodiment of the present invention proposes a spaceborne high-order modulation device, including: a conversion module, two modulators, a splitter, a phase shifter and a combiner. The conversion module is used for Converting the input serial data into parallel data; the two modulators are connected to the conversion module, and one of the two modulators is connected to the splitter through the phase shifter, so The other modulator of the two modulators is directly connected to the splitter for modulating the input information; the splitter is used for splitting the local oscillator signal into multiple paths and sending them to the two splitters respectively. a modulator; the phase shifter is used to delay the phase of the input local oscillator signal; and the combiner is respectively connected to the two modulators, and is used to add the two input signals to output modulation information.

In an example of the present invention, the modulator is a QPSK modulator.

According to the device of the embodiment of the present invention, by using the QPSK modulator to convert the data, and delaying and adding the modulated data to obtain the modulation information, the high-order modulation of the data is realized, and the implementation method in the digital communication system is reduced. complexity, while avoiding the use of digital-to-analog conversion, improving the reliability of the system.

In order to achieve the above object, another embodiment of the present invention proposes a spaceborne high-order modulation device, including: a conversion module, a plurality of modulators, a splitter, a plurality of amplifiers, and a combiner. The conversion module uses for converting the input serial data into parallel data; a plurality of modulators are respectively connected with the conversion module and the splitter for modulating the input information; the splitter is used for converting the local oscillator signal Divide into multiple paths and send each path to a corresponding modulator; the multiple amplifiers are connected to a part of the multiple modulators in a one-to-one correspondence for amplifying the input signal; and the combination The amplifiers are respectively connected to another part of the plurality of modulators and the plurality of amplifiers, and are used for adding multiple input signals to output modulation information.

In an embodiment of the present invention, when the number of the multiple modulators and the multiple amplifiers are two and one respectively, the two modulators are respectively connected to the splitter and the conversion module, And one of the modulators is directly connected to the combiner, and the other modulator is connected to the amplifier, wherein the amplifier amplifies the input signal twice.

In an embodiment of the present invention, when the number of the multiple modulators and the multiple amplifiers are three and two respectively, the three modulators are respectively connected to the splitter and the conversion module, And one of the modulators is connected to the combiner, and the other two modulators are respectively connected to the two amplifiers, wherein the two amplifiers respectively amplify the input signal twice and four times.

In one embodiment of the present invention, the modulator is a QPSK modulator.

According to the device of the embodiment of the present invention, by using the QPSK modulator to convert the data, and amplifying and adding the modulated data to obtain the modulation information, the high-order modulation of the data is realized, and the implementation mode in the digital communication system is reduced. complexity, while avoiding the use of digital-to-analog conversion, improving the reliability of the system.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a frame diagram of a spaceborne high-order modulation device according to an embodiment of the present invention;

Fig. 2 is the modulation schematic diagram of the QPSK modulator according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of data processing of a spaceborne high-order modulation device according to an embodiment of the present invention;

FIG. 4 is a constellation mapping relationship diagram of 8PSK according to an embodiment of the present invention;

Fig. 5 is a frame diagram of a spaceborne high-order modulation device according to another embodiment of the present invention;

6 is a schematic diagram of data processing of a spaceborne high-order modulation device according to another embodiment of the present invention;

FIG. 7 is a constellation mapping relationship diagram of 16QAM according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of data processing of a spaceborne high-order modulation device according to another embodiment of the present invention; and

FIG. 9 is a diagram showing a constellation mapping relationship of 64QAM according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

FIG. 1 is a block diagram of a spaceborne high-order modulation device according to an embodiment of the present invention. As shown in FIG. 1 , the spaceborne high-order modulation device according to the embodiment of the present invention includes a conversion module 100 , two modulators 200 , a splitter 300 , a phase shifter 400 and a combiner 500 .

The conversion module 100 is used to convert the input serial data into parallel data.

Both modulators 200 are connected to the conversion module, and one of the two modulators is connected to the splitter through a phase shifter, and the other of the two modulators is directly connected to the splitter for input The information is modulated.

Fig. 2 is a schematic diagram of modulation by a QPSK modulator according to an embodiment of the present invention. As shown in Figure 2, the splitter divides the input local oscillator signal into two channels, one of which achieves a carrier phase lag of 90° through a 90° phase shifter, and the two local oscillator signals are respectively fed to two multipliers, and the I channel Multiplied with the Q input signal. The combiner adds the signals output by the two multipliers, synthesizes the QPSK modulated signal and outputs it.

The splitter 300 is used to divide the local oscillator signal into multiple paths and send them to the two modulators respectively.

The phase shifter 400 is used to delay the phase of the input local oscillator signal.

The combiner 500 is respectively connected to the two modulators, and is used for adding the two input signals to output modulation information.

Fig. 3 is a schematic diagram of data processing of a spaceborne high-order modulation device according to an embodiment of the present invention. As shown in Figure 3, the serial input information is converted into three-bit information of b0, b1 and b2 through the conversion module, and output. The splitter divides the input local oscillator signal into two channels, one of which is implemented by a 45° phase shifter to lag the carrier phase by 45°, and sends the two local oscillator signals to two QPSK modulators respectively. b0 and b1 are respectively used as the I-channel and Q-channel information of the QPSK modulator 1 to realize signal modulation. Similarly, b0 and b2 are respectively used as I-channel and Q-channel information of the QPSK modulator 2 to realize signal modulation. Finally, the combiner adds the two QPSK modulation signals to synthesize an 8PSK modulation signal and outputs it. FIG. 4 shows a constellation mapping relationship diagram of 8PSK, where b0, b1 and b2 are input three-bit serial data.

According to the above principle, two 8PSKs can be used to form 16PSK direct modulation by adopting the above idea, and the lag of the phase shifter can be changed to 22.5°.

According to the device of the embodiment of the present invention, by using the QPSK modulator to convert the data, and delaying and adding the modulated data to obtain the modulation information, the high-order modulation of the data is realized, and the implementation method in the digital communication system is reduced. complexity, while avoiding the use of digital-to-analog conversion, improving the reliability of the system.

Fig. 4 is a block diagram of a spaceborne high-order modulation device according to another embodiment of the present invention. As shown in FIG. 4 , the spaceborne high-order modulation device according to the embodiment of the present invention includes a conversion module 600 , multiple modulators 700 , a splitter 800 , multiple amplifiers 900 and a combiner 1000 .

The conversion module 600 is used to convert the input serial data into parallel data.

A plurality of modulators 700 are respectively connected to the conversion module and the splitter for modulating the input information.

The splitter 800 is used for splitting the local oscillator signal into multiple paths and sending each path to a corresponding modulator.

The multiple amplifiers 900 are connected to a part of the multiple modulators in a one-to-one correspondence, and are used to amplify the input signal.

The combiner 1000 is respectively connected to another part of the multiple modulators and multiple amplifiers, and is used for adding multiple input signals to output modulation information.

Fig. 6 is a schematic diagram of data processing of a spaceborne high-order modulation device according to another embodiment of the present invention. As shown in Figure 6, through the conversion module, the serially input four-bit information is converted into parallel outputs b0, b1, b2 and b3. The splitter splits the input local oscillator signal into two paths and sends them to two QPSK modulators respectively. b0 and b1 are respectively used as I-channel and Q-channel information of QPSK modulator 1 to realize QPSK modulation. Similarly, b2 and b3 are respectively used as the I-channel and Q-channel information of the QPSK modulator 2 to realize QPSK modulation, and the modulated signal is further amplified by 2 times through the amplifier. Finally, the combiner adds the two QPSK modulated signals to synthesize a 16QAM modulated signal and outputs it. FIG. 7 shows a constellation mapping relationship diagram of 16QAM, where b0 and b2 are mapped to the I way, and b1 and b3 are mapped to the Q way.

Fig. 8 is a schematic diagram of data processing of a spaceborne high-order modulation device according to another embodiment of the present invention. As shown in Figure 8, the serially input six-bit information is converted into parallel outputs b0, b1, b2, b3, b4 and b5 by the conversion module. The splitter splits the input local oscillator signal into three paths and sends them to three QPSK modulators respectively. b0 and b1 are respectively used as I-channel and Q-channel information of QPSK modulator 1 to realize QPSK modulation. Similarly, b2 and b3 are respectively used as the I-channel and Q-channel information of the QPSK modulator 2 to realize QPSK modulation, and the modulated signal is further amplified by 2 times through the amplifier. b4 and b5 are respectively used as the I-channel and Q-channel information of the QPSK modulator 3 to realize QPSK modulation, and the modulated signal is further amplified by 4 times through the amplifier. Finally, the combiner adds the three QPSK modulated signals to synthesize a 64QAM modulated signal and outputs it. FIG. 8 shows a constellation mapping relationship diagram of 64QAM, where b0, b2 and b4 are mapped to the I way, and b1, b3 and b5 are mapped to the Q way.

According to the above principle, by adopting the above idea, the QPSK modulator can be used to realize higher order quadrature amplitude modulation.

According to the device of the embodiment of the present invention, by using the QPSK modulator to convert the data, and amplifying and adding the modulated data to obtain the modulation information, the high-order modulation of the data is realized, and the implementation mode in the digital communication system is reduced. complexity, while avoiding the use of digital-to-analog conversion, improving the reliability of the system.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (6)

1. A space-borne high-order modulation device is characterized in that, comprising: a conversion module, two modulators, a splitter, a phase shifter and a combiner, The conversion module is used to convert the input serial data into parallel data; Both of the two modulators are connected to the conversion module, and one of the two modulators is connected to the splitter through the phase shifter, and the other of the two modulators is directly connected to the splitter for modulating input information; The splitter is used to divide the local oscillator signal into multiple paths and send them to the two modulators respectively; The phase shifter is used to delay the phase of the input local oscillator signal; and The combiner is respectively connected to the two modulators, and is used for adding two input signals to output modulation information. 2. The spaceborne high-order modulation device according to claim 1, wherein the modulator is a QPSK modulator. 3. A spaceborne high-order modulation device, characterized in that it includes: a conversion module, a plurality of modulators, a splitter, a plurality of amplifiers and a combiner, The conversion module is used to convert the input serial data into parallel data; A plurality of modulators are respectively connected to the conversion module and the splitter for modulating input information; The splitter is used to divide the local oscillator signal into multiple paths and send each path to a corresponding modulator; The plurality of amplifiers are connected to a part of the plurality of modulators in a one-to-one correspondence, and are used to amplify the input signal; and The combiner is respectively connected to another part of the multiple modulators and the multiple amplifiers, and is used for adding multiple input signals to output modulation information. 4. The spaceborne high-order modulation device as claimed in claim 3, wherein when the number of the plurality of modulators and the number of amplifiers is 2 and 1 respectively, the two modulators are respectively connected to the The splitter is connected to the conversion module, one of the modulators is directly connected to the combiner, and the other modulator is connected to the amplifier, wherein the amplifier amplifies the input signal twice. 5. The spaceborne high-order modulation device as claimed in claim 3, wherein when the number of the plurality of modulators and the number of amplifiers is 3 and 2 respectively, the three modulators are respectively connected to the The splitter is connected to the conversion module, and one of the modulators is connected to the combiner, and the other two modulators are respectively connected to the two amplifiers, wherein the two amplifiers respectively amplify the input signal Double and quadruple. 6. The spaceborne high-order modulation device according to any one of claims 3-5, wherein the modulator is a QPSK modulator.

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