CN112738001A - Quadrature keying modulation method, demodulation method, system, transmitter and receiver - Google Patents
Quadrature keying modulation method, demodulation method, system, transmitter and receiver Download PDFInfo
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- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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Abstract
The invention provides a quadrature keying modulation method, a demodulation method, a system, a transmitter and a receiver, belonging to the technical field of communication. The method comprises the following steps: performing serial-to-parallel conversion on an input bit sequence; modulating the first path of data obtained after serial-to-parallel conversion into a linear frequency modulation signal; mapping the second path of data obtained after the serial-parallel conversion into a constellation symbol, wherein the second path of data and the first path of data have orthogonal phase shift; and synthesizing the constellation symbol and the linear frequency modulation signal, and transmitting the synthesized spread spectrum signal. The invention can be used for signal modulation and demodulation of the wireless communication system of the power grid.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an orthogonal keying modulation method, an orthogonal keying demodulation method, an orthogonal keying modulation system, an orthogonal keying demodulation system, a transmitter, a receiver, an electronic device, and a computer-readable storage medium.
Background
The user information acquisition system of the power system is a system for acquiring, processing and monitoring the power utilization information of power users in real time, and realizes the functions of automatic acquisition of the power utilization information, abnormal metering monitoring, power quality monitoring, power utilization analysis and management, related information release, distributed energy monitoring, information interaction of intelligent power utilization equipment and the like.
The centralized meter reading terminal is equipment for collecting the electricity utilization information of low-voltage users, and comprises a concentrator and a collector. The concentrator is a device which collects data of each collector or electric energy meter, processes and stores the data, and can communicate the data with a master station or handheld equipment. The collector is a device which is used for collecting the electric energy information of a plurality of or a single electric energy meter and exchanging data with the concentrator.
The remote meter reading communication mode adopted by the current centralized meter reading terminal comprises the following steps: low voltage Power Line Communication (PLC), broadband and broadband low voltage Power Line Communication (HPLC), and micro Power wireless. PLC and HPLC are wired communication modes, have industrial standards in the power grid, and have mature technologies. However, because the coverage of the power grid is large, the working environment is complex, and the electromagnetic interference is serious, some limitations of the power line carrier are found in the application, for example, a part of transmission blind spots exist during networking, and cannot be covered, and moreover, the transmission performance of the PLC and the HPLC is greatly changed due to the influence of the load of the power line and the change of the surrounding environment, so that the retransmission times are unstable, and the meter reading success rate is greatly changed.
Therefore, currently, a micropower wireless communication network is widely used as a supplementary communication method for the power line carrier network. The micropower wireless communication network can provide more and more flexible routes, and greatly improves the coverage rate of the user information acquisition system. Chirp, i.e., Chirp modulation technology, has a wide application in radar systems, and in recent years, Chirp modulation technology is also beginning to be used in the field of wireless communication, but application of Chirp in power grid micropower wireless communication is not seen, so that the Chirp modulation technology needs to be applied to the power grid micropower wireless communication system to meet the communication requirement of high throughput rate according to the characteristics of the power grid communication system.
Disclosure of Invention
The invention aims to provide an orthogonal keying modulation method, a demodulation method, a system, a transmitter and a receiver, which can avoid poor communication quality caused by the influence of power lines and environment on power network wireless communication, and further improve communication transmission performance and communication data throughput rate.
In order to achieve the above object, an embodiment of the present invention provides a quadrature keying modulation method, including:
performing serial-to-parallel conversion on an input bit sequence;
modulating the first path of data obtained after serial-to-parallel conversion into a linear frequency modulation signal;
mapping the second path of data obtained after the serial-parallel conversion into a constellation symbol, wherein the second path of data and the first path of data have orthogonal phase shift;
and synthesizing the constellation symbol and the linear frequency modulation signal, and transmitting the synthesized spread spectrum signal.
Specifically, the first path of data obtained after the modulation serial-to-parallel conversion is a linear frequency modulation signal of a linear frequency increasing signal and a linear frequency decreasing signal, and includes:
according to the configured spreading factor and the chirp elementary signal, the first path of data obtained after modulation serial-parallel conversion is a chirp signal with a linear frequency-increasing signal and a linear frequency-decreasing signal, wherein,
and the data element in the first path of data is used for selecting the signal of the linear frequency modulation element signal at the corresponding position in the linear frequency modulation signal as the linear frequency increasing signal or the linear frequency decreasing signal.
Specifically, the mapping serial-to-parallel conversion to obtain the second path of data as a constellation symbol includes:
the data elements in the second path of data obtained after the serial-to-parallel conversion are modulated by phase shift keying are constellation symbols, wherein,
the data elements in the second path of data are used for selecting the phase of the selected signal,
the selected signal is the signal at the corresponding position in the chirp signal selected by the data element in the first path of data.
Specifically, the synthesizing the constellation symbol and the chirp signal includes:
multiplying the constellation symbol with the chirp signal.
Specifically, the transmitting the synthesized spread spectrum signal includes:
the spread spectrum signal obtained after synthesis passes through a transmitting filter;
and transmitting the spread spectrum signal after passing through the transmission filter.
Specifically, in the quadrature keying modulation method,
the constellation symbols include BPSK symbols, QPSK symbols, and 8PSK symbols.
The embodiment of the invention provides an orthogonal keying demodulation method, which comprises the following steps:
receiving a spread spectrum signal in the quadrature keying modulation method;
and performing despreading on the spread spectrum signal, performing phase shift keying demodulation on the despread signal, and obtaining received data corresponding to the spread spectrum signal.
Specifically, the despreading the spread spectrum signal and performing phase shift keying demodulation on the despread signal to obtain the received data corresponding to the spread spectrum signal includes:
performing correlation operation on a spread spectrum symbol in a received spread spectrum signal and a local pre-stored linear frequency increasing signal and a linear frequency reducing signal to obtain a first correlation signal corresponding to the linear frequency increasing signal and a second correlation signal corresponding to the linear frequency reducing signal;
taking absolute values of real parts of the first correlation signal and the second correlation signal, comparing the absolute values of the real parts of the first correlation signal and the second correlation signal, and obtaining a despread signal through the correlation signal with the larger absolute value of the real parts;
and obtaining a current demodulation signal through the related signal with a larger absolute value in the despread signal, and performing demapping through a phase shift keying symbol in the current demodulation signal to obtain received data with information bits.
An embodiment of the present invention provides a quadrature keying modulation system, including:
the device comprises a serial-parallel conversion module, a data acquisition module and a data processing module, wherein the serial-parallel conversion module is used for performing serial-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, and the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulation module is used for modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulation module is used for mapping the second path of data into a constellation symbol;
and the transmitting module is used for synthesizing the constellation symbol and the linear frequency modulation signal and transmitting the spread spectrum signal obtained after synthesis.
An embodiment of the present invention provides an orthogonal keying demodulation system, including:
a receiving module, configured to receive a spread spectrum signal in the foregoing quadrature keying modulation system;
and the demodulation module is used for despreading the spread spectrum signal, performing phase shift keying demodulation on the despread signal and acquiring received data corresponding to the spread spectrum signal.
An embodiment of the present invention provides a transmitter, including:
the device comprises a serial-to-parallel converter and a data processing unit, wherein the serial-to-parallel converter is configured to have a function of performing serial-to-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, and the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulator is connected with the serial-parallel converter and is configured to have a function of modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulator is connected with the serial-parallel converter and is configured to have a function of mapping the second path of data into constellation symbols;
and the transmitter is connected with the quadrature modulator and the phase shift keying modulator and is configured to have the functions of synthesizing the constellation symbols and the chirp signals and transmitting the synthesized spread spectrum signals.
An embodiment of the present invention provides a receiver, including:
a receiver configured to have a function of the spread spectrum signal in the aforementioned transmitter;
a demodulator connected to the receiver and configured to perform despreading on the spread signal, perform phase shift keying demodulation of the despread signal, and obtain received data corresponding to the spread signal.
In another aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implements the aforementioned method by executing the instructions stored by the memory.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform the foregoing method.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the main method steps of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary modem module in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of the Up Chirp and Down Chirp spectra in the embodiment of the present invention;
fig. 4 is a schematic waveform diagram of a Chirp signal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of B/QPSK (binary phase shift keying BPSK and quadrature phase shift keying QPSK) modulation constellation symbols according to an embodiment of the present invention;
fig. 6 is a schematic diagram of comparison of simulation result curves of Bok combined with BPSK Chirp modulation and BPSKChirp modulation according to the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Example 1
Chirp modulation, i.e., Chirp modulation, has been widely used in radar systems, and in recent years, Chirp modulation, as typified by LoRa, has also been used in the field of wireless communication. The information carried by the LoRa Modulation signal is determined by the initial frequency of the symbol, while the Chirp signal can be considered as a carrier, and LoRa can be actually considered as a frequency-switched Chirp Modulation technique, i.e., (frequency shift Chirp) FSCM. In the LoRa system, only linear Frequency-increasing signals (such as UpChirp signals, Frequency increases with Time, Frequency unit Hz, Time unit seconds) are used for carrying information, and linear Frequency-decreasing signals (such as DownChirp signals, Frequency decreases with Time) are used for synchronous cut-off. Meanwhile, the technology of using UpChirp and DownChirp signals to carry information can be regarded as a Bok technology based on linear frequency modulation, and the Bok technology based on Chirp is not applied to the communication field at present.
Because the LoRa carries information by frequency offset, a receiving end detects signals by demodulating the initial frequency of each chirp signal, and the interval between adjacent initial frequencies is smaller and smaller along with the improvement of the spreading factor, so that the LoRa is very sensitive to frequency offset, and when the frequency offset cannot be corrected, the system performance cannot be guaranteed. In the LoRa system, UpChirp and DownChirp signals are used as synchronization signals, and UpChirp and DownChirp signals are not used for carrying information. Currently, communication systems are known that combine a single Chirp technique with a phase modulation technique, such as BPSK, QPSK, 8PSK, since the information bits are all carried by the phase modulation technique, while Chirp corresponds to a spread-spectrum carrier whose information rate is determined by the phase modulation technique.
Since the Chirp modulation comprises the UpChirp and the DownChirp, the embodiment of the invention applies both signals in information bearing and combines with a phase modulation technology (MPSK), thereby improving the system throughput rate.
An embodiment of the present invention provides a quadrature keying modulation method, as shown in fig. 1, where the quadrature keying modulation method includes:
performing serial-to-parallel conversion on an input bit sequence;
modulating the first path of data obtained after serial-to-parallel conversion into a linear frequency modulation signal;
mapping the second path of data obtained after the serial-parallel conversion into a constellation symbol, wherein the second path of data and the first path of data have orthogonal phase shift;
and synthesizing the constellation symbol and the linear frequency modulation signal, and transmitting the synthesized spread spectrum signal.
In some implementations, the serial-to-parallel conversion can be a serial-to-parallel conversion; the first path of data can be odd path data or Q (quadrature subcarrier) path data, and the second path of data can be even path data or I (in-phase subcarrier) path data; the constellation symbols may have corresponding bits according to a specific Phase Shift Keying type used, for example, as shown in fig. 5, when orthogonal frequency division multiplexing is used, the corresponding time frequency resource may be a subcarrier, when time division multiplexing is used, the corresponding time frequency resource may be a time slot, the constellation symbols defined by BPSK (Binary Phase Shift Keying) may include 0 and 1 (two small circles in a horizontal direction), the constellation symbols defined by QPSK (Quadrature Phase Shift Keying) may include 00, 01, 10, and 11 (if the vertical axis is north-south, the constellation symbols may correspond to small circles located in north-east, north-west, south-east, and south-west, respectively), and the constellation symbols defined by 8PSK (8Phase Shift Keying ) may include 8 constellation symbols such as 000, 001, and the like; the Chirp signal may include a Chirp signal, the Chirp signal may be obtained through a Chirp primitive signal generated by a Chirp signal generator and the first path of data, the signal type of the Chirp signal at the corresponding position in the Chirp signal may be selected by a data element in the first path of data, which may be Up Chirp or Down Chirp, the data element in the first path of data (which may be a bit sequence) may be a bit or a bit group, then the data elements in the second path of data obtained after the serial-parallel conversion are modulated by phase shift keying are constellation symbols, wherein the data elements (which may be bits or bit groups) in the second path of data (which may be a bit sequence) are used for selecting the phase of the selected signal, the selected signal is the signal at the corresponding position in the chirp signal selected by the data element in the first path of data. The constellation symbols and the Chirp signal may then be multiplied to obtain a spread spectrum signal, which may be a signal with phase-encoded Up Chirp and Down Chirp. Further, the spread spectrum signal obtained after the multiplication may be transmitted after being subjected to a transmission filter.
In some implementations, for example, the modulation of the spread spectrum signal may be implemented at the transmitting end by using quadrature keying modulation in combination with any one of phase shift keying modulation, and the step of modulating the spread spectrum signal may specifically include:
step1, carrying out series-parallel conversion on an input bit sequence, inputting odd-path data into an orthogonal keying modulation module, and inputting even-path data into a phase shift keying modulation module;
step2, modulating the bit sequence input into the quadrature keying modulation module into UpChirp and DownChirp signals according to the spreading factor SF (spreading factor) and BaseChirp (which can be a linear frequency modulation element) sequence;
step3, modulating the bit sequence input into the phase shift keying modulation module into a constellation symbol by adopting phase shift keying;
step4, multiplying the modulated Chirp signal and the constellation symbol to obtain a spread spectrum signal to be transmitted;
and step5, transmitting the modulated spread spectrum signal through a transmitting filter.
The embodiment of the invention also provides an orthogonal keying demodulation method, which comprises the following steps:
receiving a spread spectrum signal in the quadrature keying modulation method;
and performing despreading on the spread spectrum signal, performing phase shift keying demodulation on the despread signal, and obtaining received data corresponding to the spread spectrum signal.
In some specific implementations, the signal modulation mode used by the transmitting end may be matched, and for the receiving end, taking demodulating the spread spectrum signal modulated and transmitted by the quadrature keying module and the phase shift keying module as an example, the following demodulation steps may be specifically performed:
step1, performing correlation operation on a spread spectrum symbol in a received spread spectrum signal and a locally pre-stored UpChirp signal and a DownChirp signal to obtain a first correlation signal corresponding to the UpChirp signal and a second correlation signal corresponding to the DownChirp signal;
step2, taking absolute values of real parts of the first correlation signal and the second correlation signal, comparing the absolute values of the real parts of the first correlation signal and the second correlation signal, and obtaining a despread signal through the correlation signal with the larger absolute value of the real parts;
and step3, obtaining a current demodulation signal through a correlation signal with a larger absolute value (which can be relative to a preset threshold value) in the despread signal, and performing demapping through a phase shift keying symbol in the current demodulation signal to obtain received data with information bits.
Example 2
The embodiment of the present invention is the same as embodiment 1, and provides a quadrature keying modulation system, including:
the device comprises a serial-parallel conversion module, a data acquisition module and a data processing module, wherein the serial-parallel conversion module is used for performing serial-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, and the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulation module is used for modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulation module is used for mapping the second path of data into a constellation symbol;
and the transmitting module is used for synthesizing the constellation symbol and the linear frequency modulation signal and transmitting the spread spectrum signal obtained after synthesis.
The embodiment of the invention also provides an orthogonal keying demodulation system, which comprises:
a receiving module, configured to receive a spread spectrum signal in the foregoing quadrature keying modulation system;
and the demodulation module is used for despreading the spread spectrum signal, performing phase shift keying demodulation on the despread signal and acquiring received data corresponding to the spread spectrum signal.
Example 3
The embodiment of the present invention belongs to the same inventive concept as embodiments 1 and 2, and the embodiment of the present invention provides a transmitter, including:
the S/P serial-parallel converter is configured to have a function of performing serial-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, wherein the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulator is connected with the serial-parallel converter and is configured to have a function of modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulator is connected with the serial-parallel converter and is configured to have a function of mapping the second path of data into constellation symbols;
and the transmitter is connected with the quadrature modulator and the phase shift keying modulator and is configured to have the functions of synthesizing the constellation symbols and the chirp signals and transmitting the synthesized spread spectrum signals.
In some implementations, as in FIG. 2, the bit sequence b is inputnCan be converted into odd-path data (first-path data) and even-path data (second-path data), the Chirp signal can be selected as a Chirp signal, the quadrature modulator can comprise a Chirp-BoK modulation (information bit is modulated into one of Up Chirp and Down Chirp, the information bit can be a data element) module, the frequency spectrums of Up Chirp and Down Chirp are shown in fig. 3, the Chirp signal modulated by the Chirp signal is shown in fig. 4, the Chirp-BoK modulation module is configured to have the function of modulating the odd-path data into the Chirp signal, the phase shift keying modulator can comprise a BPSK modulation (phase modulation technology, information bit is modulated onto different phases, the information bit can be a data element) module, the BPSK modulation module is configured to have the function of mapping the even-path data into symbols, the transmitter can comprise a multiplier and a TX transmitting filter, a multiplier may be used to synthesize the constellation symbols and the chirp signal; illustratively, BoK may be performed by a transmitterModulation and BPSK modulation, and the specific modulation steps may include:
step1, carrying out series-parallel conversion on an input bit sequence, inputting odd-path data into a ChirpBoK modulation module, and inputting even-path data into a BPSK modulation module;
step2, modulating input data into UpChirp and DownChirp signals according to a spreading coefficient SF and a BaseChirp (which can be a linear frequency modulation primitive) sequence;
step3, modulating the input bit sequence into constellation symbols by adopting BPSK;
step4, multiplying the modulated Chirp signal and the BPSK symbol to obtain a spread spectrum signal to be transmitted;
and step5, transmitting the modulated spread spectrum signal through a transmitting filter.
If the phase modulation technology adopts a BPSK modulation method, the embodiment of the invention performs spread spectrum signal modulation by matching BoK modulation and BPSK modulation, so that the transmission rate of the system is doubled; if the QPSK modulation method is adopted, the embodiment of the invention leads the system rate to be improved 1/2; if 8PSK, 1/4 is increased.
Fig. 6 shows a simulation of a Chirp modulation system using Bok in combination with BPSK and a modulation system using only BPSK, where the vertical axis is a Bit Error Rate (BER), Es/N0 is a symbol signal-to-noise ratio, and Es/N0 refers to a ratio of energy of each symbol to noise power spectral density.
An embodiment of the present invention further provides a receiver, where the receiver includes:
an RX receiver configured to have a function of receiving the spread spectrum signal in the aforementioned transmitter;
a demodulator connected with the receiver and configured to perform despreading on the spread spectrum signal, perform phase-shift keying demodulation (which may be multiple phase-shift keying (MPSK) demodulation) on the despread signal, and obtain a signal corresponding to the spread spectrum signalReceived data r corresponding to spread spectrum signalnThe function of (c).
Taking the demodulation of the spread spectrum signal modulated and transmitted by the BoK module and the BPSK module as an example, the receiver may be configured to specifically perform the following demodulation steps:
step1, performing correlation operation on a spread spectrum symbol in a received spread spectrum signal and a locally pre-stored UpChirp signal and a DownChirp signal to obtain a first correlation signal corresponding to the UpChirp signal and a second correlation signal corresponding to the DownChirp signal;
step2, taking absolute values of real parts of the first correlation signal and the second correlation signal, comparing the absolute values of the real parts of the first correlation signal and the second correlation signal, and obtaining a Chirp despread signal (corresponding to the modulation of the BoK modulation module) through the correlation signal with the larger absolute value of the real parts;
step3, obtaining a current demodulation signal (corresponding to the modulation of the BPSK modulation module) through a correlation signal (which can be relative to a pre-configured threshold value) with a larger absolute value in the Chirp despread signal, and obtaining received data r with information bits through demapping the BPSK symbol in the current demodulation signaln。
The invention provides a Chirp modulation system for wireless communication of a power network, which adopts a Bok combined MPSK modulation technology based on Chirp and improves the communication capacity and transmission rate of the system by combining an Up Chirp technology, a Down Chirp technology and an MPSK technology;
the invention provides a method for flexibly adjusting BoK and BPSK, QPSK, 8PSK and other modulation modes according to system service requirements in a power network wireless communication Chirp modulation system, and a modulation mode combining BoK and MPSK;
the invention provides a corresponding demodulation mode by combining BoK with MPSK modulation in a Chirp modulation system for wireless communication of a power grid.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (14)
1. A quadrature keying modulation method, characterized in that the quadrature keying modulation method comprises:
performing serial-to-parallel conversion on an input bit sequence;
modulating the first path of data obtained after serial-to-parallel conversion into a linear frequency modulation signal;
mapping the second path of data obtained after the serial-parallel conversion into a constellation symbol, wherein the second path of data and the first path of data have orthogonal phase shift;
and synthesizing the constellation symbol and the linear frequency modulation signal, and transmitting the synthesized spread spectrum signal.
2. The quadrature keying modulation method of claim 1, wherein the first path of data obtained after the modulation serial-to-parallel conversion is a chirp signal of a linear up-conversion signal and a linear down-conversion signal, and the method comprises:
according to the configured spreading factor and the chirp elementary signal, the first path of data obtained after modulation serial-parallel conversion is a chirp signal with a linear frequency-increasing signal and a linear frequency-decreasing signal, wherein,
and the data element in the first path of data is used for selecting the signal of the linear frequency modulation element signal at the corresponding position in the linear frequency modulation signal as the linear frequency increasing signal or the linear frequency decreasing signal.
3. The quadrature keying modulation method of claim 2, wherein the mapping serial-to-parallel conversion is performed to obtain a second path of data as a constellation symbol, and the method comprises:
the data elements in the second path of data obtained after the serial-to-parallel conversion are modulated by phase shift keying are constellation symbols, wherein,
the data elements in the second path of data are used for selecting the phase of the selected signal,
the selected signal is the signal at the corresponding position in the chirp signal selected by the data element in the first path of data.
4. The quadrature keying modulation method of claim 1, wherein said synthesizing the constellation symbol and the chirp signal comprises:
multiplying the constellation symbol with the chirp signal.
5. The quadrature keying modulation method of claim 1, wherein said transmitting the synthesized spread spectrum signal comprises:
the spread spectrum signal obtained after synthesis passes through a transmitting filter;
and transmitting the spread spectrum signal after passing through the transmission filter.
6. The quadrature keying modulation method of any one of claims 1 to 5, wherein in the quadrature keying modulation method,
the constellation symbols include BPSK symbols, QPSK symbols, and 8PSK symbols.
7. A quadrature keying demodulation method, characterized in that the quadrature keying demodulation method comprises:
receiving a spread spectrum signal in the quadrature keying modulation method of any one of claims 1 to 6;
and performing despreading on the spread spectrum signal, performing phase shift keying demodulation on the despread signal, and obtaining received data corresponding to the spread spectrum signal.
8. The quadrature keying demodulation method of claim 7, wherein the performing despreading on the spread signal, performing phase shift keying demodulation on the despread signal, and obtaining the received data corresponding to the spread signal comprises:
performing correlation operation on a spread spectrum symbol in a received spread spectrum signal and a local pre-stored linear frequency increasing signal and a linear frequency reducing signal to obtain a first correlation signal corresponding to the linear frequency increasing signal and a second correlation signal corresponding to the linear frequency reducing signal;
taking absolute values of real parts of the first correlation signal and the second correlation signal, comparing the absolute values of the real parts of the first correlation signal and the second correlation signal, and obtaining a despread signal through the correlation signal with the larger absolute value of the real parts;
and obtaining a current demodulation signal through the related signal with a larger absolute value in the despread signal, and performing demapping through a phase shift keying symbol in the current demodulation signal to obtain received data with information bits.
9. A quadrature keying modulation system, comprising:
the device comprises a serial-parallel conversion module, a data acquisition module and a data processing module, wherein the serial-parallel conversion module is used for performing serial-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, and the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulation module is used for modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulation module is used for mapping the second path of data into a constellation symbol;
and the transmitting module is used for synthesizing the constellation symbol and the linear frequency modulation signal and transmitting the spread spectrum signal obtained after synthesis.
10. A quadrature keying demodulation system, comprising:
a receiving module, configured to receive the spread spectrum signal in the quadrature keying modulation system according to claim 9;
and the demodulation module is used for despreading the spread spectrum signal, performing phase shift keying demodulation on the despread signal and acquiring received data corresponding to the spread spectrum signal.
11. A transmitter, characterized in that the transmitter comprises:
the device comprises a serial-to-parallel converter and a data processing unit, wherein the serial-to-parallel converter is configured to have a function of performing serial-to-parallel conversion on an input bit sequence to obtain a first path of data and a second path of data, and the second path of data and the first path of data have orthogonal phase shift;
the orthogonal modulator is connected with the serial-parallel converter and is configured to have a function of modulating the first path of data into a linear frequency modulation signal;
the phase shift keying modulator is connected with the serial-parallel converter and is configured to have a function of mapping the second path of data into constellation symbols;
and the transmitter is connected with the quadrature modulator and the phase shift keying modulator and is configured to have the functions of synthesizing the constellation symbols and the chirp signals and transmitting the synthesized spread spectrum signals.
12. A receiver, characterized in that the receiver comprises:
a receiver configured to have a function of receiving the spread spectrum signal in the transmitter according to claim 11;
a demodulator connected to the receiver and configured to perform despreading on the spread signal, perform phase shift keying demodulation of the despread signal, and obtain received data corresponding to the spread signal.
13. An electronic device, comprising:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method of any one of claims 1 to 8 by executing the instructions stored by the memory.
14. A computer readable storage medium storing computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 8.
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