CN113765838A - DPSK signal demodulation method, device, equipment and storage medium - Google Patents
DPSK signal demodulation method, device, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0065—Frequency error detectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0067—Phase error detectors
Abstract
The invention discloses a method, a device, equipment and a storage medium for demodulating a DPSK signal, wherein the method comprises the following steps: receiving a DPSK signal to be processed, wherein the DPSK signal comprises IQ signals corresponding to a plurality of moments; constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal; and solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal. The technical scheme of the embodiment of the invention can improve the sensitivity of the receiver, and reduce the complexity and the realization cost of the DPSK signal demodulation process.
Description
Technical Field
The embodiment of the invention relates to the field of mobile communication, in particular to a method, a device, equipment and a storage medium for demodulating a DPSK signal.
Background
Currently, modulation and demodulation are indispensable important links in a wireless communication system, and the performance of the wireless communication system is related to the performance of the whole communication system. Digital modulation and demodulation techniques are widely used in modern wireless communication systems due to their good noise immunity and excellent bit error rate performance. Among them, the Differential Phase Shift Keying (DPSK) technique in the digital modulation and demodulation technique has been widely applied to wireless communication systems because of its advantages of high transmission efficiency and strong interference resistance.
In the prior art, when bluetooth communication is adopted, methods for demodulating DPSK baseband signals are generally classified into the following two types: the first method is to carry out differential demodulation on the DPSK baseband signal based on the angle, namely, firstly, the phase of adjacent code elements is compared, and then, the demodulation result is obtained after low-pass filtering and sampling judgment; the second method is to perform coherent demodulation based on In-phase quadrature (IQ) signals, i.e., a plurality of parallel IQ signals are down-sampled from 48Msps to 4Msps through a Digital Front End (DFE), filtered through a corresponding low-pass filter, synchronized to obtain the position and initial frequency offset of an optimal sampling point, mapped to a rotation angle according to a constellation diagram, and finally converted to a serial transmission bit stream.
However, in the first demodulation method, demodulation is performed only according to the phase of the adjacent symbol, resulting in low sensitivity of the receiver; the second demodulation method has higher complexity and higher implementation cost; secondly, the existing demodulation method is lack of a frequency offset tracking strategy, so that the stability and robustness of a communication system are low.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for demodulating a DPSK signal, which can improve the sensitivity of a receiver, and reduce the complexity and implementation cost of a DPSK signal demodulation process.
In a first aspect, an embodiment of the present invention provides a method for demodulating a DPSK signal, including:
receiving a DPSK signal to be processed, wherein the DPSK signal comprises IQ signals corresponding to a plurality of moments;
constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
In a second aspect, an embodiment of the present invention further provides a device for demodulating a DPSK signal, where the device includes:
the device comprises a signal receiving module, a processing module and a processing module, wherein the signal receiving module is used for receiving a DPSK signal to be processed, and the DPSK signal comprises IQ signals corresponding to a plurality of moments;
the function construction module is used for constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and the demodulation module is used for solving the cost function according to the signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
In a third aspect, an embodiment of the present invention further provides a computer device, where the computer device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, the one or more programs cause the one or more processors to implement a method for demodulating a DPSK signal provided by any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements a method for demodulating a DPSK signal provided in any embodiment of the present invention.
According to the technical scheme of the embodiment of the invention, the DPSK signal to be processed is received, the cost function matched with the DPSK signal is constructed according to the preset constellation diagram rotation angle and the preset frequency offset corresponding to the DPSK signal, and the cost function is solved according to the signal expression corresponding to each IQ signal to obtain the demodulation result corresponding to the DPSK signal.
Drawings
Fig. 1 is a flowchart of a demodulation method of a DPSK signal in a first embodiment of the present invention;
fig. 2 is a flowchart of a method for demodulating a DPSK signal according to a second embodiment of the present invention;
fig. 3a is a flowchart of a demodulation method of a DPSK signal in the third embodiment of the present invention;
fig. 3b is a block diagram of a frequency offset tracking loop in a third embodiment of the present invention;
fig. 4 is a structural diagram of a demodulation apparatus for a DPSK signal in the fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device in the fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a demodulation method for a DPSK signal according to an embodiment of the present invention, where the present embodiment is applicable to a receiver demodulating a received DPSK signal, and the method may be executed by a demodulation apparatus for a DPSK signal, where the demodulation apparatus may be implemented by software and/or hardware, and may be generally integrated in a terminal or a server having a data processing function, and specifically includes the following steps:
In this embodiment, the terminal or the server may serve as a receiver, and receive a signal (i.e., a DPSK signal) obtained by modulating an original signal by using a DPSK technique at a transmitting end. The DPSK signal comprises a plurality of IQ signals corresponding to a plurality of moments.
And 120, constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal.
In this embodiment, after receiving a DPSK signal to be processed, a rotation angle (b) of a constellation diagram corresponding to the DPSK signal may be calculated
And
) And phase offset between adjacent IQ signals
Performing estimation, the phase deviation
May be equivalent to a frequency offset between adjacent IQ signals.
In this step, optionally, a cost function matched with the DPSK signal may be constructed according to a signal expression corresponding to each of a plurality of continuous IQ signals in the DPSK signal, a preset constellation rotation angle and a preset frequency offset corresponding to the DPSK signal. In particular, assume the first
The IQ signal at a time can be expressed as
Wherein:
wherein the content of the first and second substances,
representing the actual constellation rotation angle corresponding to the DPSK signal,
representing the actual phase deviation between the IQ signals in the DPSK signal due to frequency deviation,
is shown as
The IQ signal at time.
In this embodiment, the above steps are performed to obtain a plurality of pairs of continuous IQ signalsAfter the corresponding signal expression, a cost function matched with the DPSK signal can be constructed through the following formula
：
In this step, optionally, a signal expression corresponding to each of the IQ signals may be calculated
Corresponding when the value assumes the maximum
A value, and
and taking the two rotation angle values as a demodulation result corresponding to the DPSK signal.
In an implementation manner of the embodiment of the present invention, solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal includes:
step 131, constructing a demodulation function corresponding to the DPSK signal according to a signal expression corresponding to each IQ signal and the cost function;
in this step, a signal expression corresponding to each IQ signal may be substituted into the cost function to obtain a demodulation function corresponding to the DPSK signal:
in this embodiment, after the demodulation function is linearly transformed, the following expression can be obtained:
step 132, according to the modulation mode corresponding to the DPSK signal, solving a demodulation function corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal;
in this step, when the above-mentioned demodulation function is used
When taking the maximum value, it can be determined
，
Then, according to the modulation mode corresponding to the DPSK signal, determining
When taking the maximum value
And
and finally, determining a target information bit matched with the target rotation angle value according to a modulation mode corresponding to the DPSK signal.
In a specific embodiment, assuming that the modulation scheme corresponding to the DPSK signal is pi/4 Shift Differential Quadrature Phase Shift Keying (pi/4-DQPSK), a set of target rotation angle values may be determined such that a 16-angle combination corresponding to pi/4-DQPSK results in a target rotation angle value
The value is maximum.
And step 133, taking the target rotation angle value and the target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal.
In this embodiment, by constructing a cost function matched with the DPSK signal and calculating a demodulation result corresponding to the DPSK signal according to the cost function, compared with a method in the prior art in which demodulation is performed only according to the phase of an adjacent symbol, accuracy of the demodulation result can be ensured, and reception performance and sensitivity of a receiver are improved; secondly, in this embodiment, a demodulation result corresponding to the DPSK signal can be obtained by solving the cost function, so that the complexity of the demodulation process and the implementation cost can be reduced.
According to the technical scheme of the embodiment of the invention, the DPSK signal to be processed is received, the cost function matched with the DPSK signal is constructed according to the preset constellation diagram rotation angle and the preset frequency offset corresponding to the DPSK signal, and the cost function is solved according to the signal expression corresponding to each IQ signal to obtain the demodulation result corresponding to the DPSK signal.
Example two
This embodiment is a further refinement of the above embodiment, and the same or corresponding terms as those of the above embodiment are explained, and this embodiment is not described again. Fig. 2 is a flowchart of a demodulation method of a DPSK signal provided in the second embodiment, the technical solution of the second embodiment may be combined with one or more methods in the solutions of the foregoing embodiments, as shown in fig. 2, the method provided in the second embodiment may further include:
And step 230, constructing a demodulation function corresponding to the DPSK signal according to the signal expression corresponding to each IQ signal and the cost function.
In this embodiment, each modulation scheme corresponds to a specific transmission information mapping table, where the transmission information mapping table includes a plurality of candidate rotation angle values corresponding to the DPSK signal for the modulation scheme.
In a specific embodiment, assuming that the modulation mode corresponding to the DPSK signal is pi/4-DQPSK, a transmission information mapping table matched with the DPSK signal may be as shown in table 1, where
For the phase difference (i.e. alternative rotation angle value) corresponding to the DPSK signal, each alternative rotation angle value corresponds to 2-bit information bits.
In another specific embodiment, assuming that the corresponding modulation mode of the DPSK signal is eight-Phase Shift Keying (8 DPSK), a transmission information mapping table matched with the DPSK signal may be as shown in table 2, wherein
For the phase difference (i.e. alternative rotation angle value) corresponding to the DPSK signal, each alternative rotation angle value corresponds to 3-bit information bits.
TABLE 1
TABLE 2
And step 250, determining a target rotation angle value corresponding to the DPSK signal when the demodulation function value corresponding to the DPSK signal is maximum according to the transmission information mapping table.
In this step, the combinations of all the alternative rotation angle values may be traversed in the transmission information mapping table, and a set of target rotation angle values may be selected from the combinations of all the alternative rotation angle values, so that the demodulation function value is maximum.
Therefore, by traversing the angle value combination in the transmission information mapping table, the determination time of the target rotation angle value can be saved, and the demodulation efficiency of the DPSK signal can be improved.
And step 260, acquiring a target information bit corresponding to the DPSK signal in the transmission information mapping table according to the target rotation angle value corresponding to the DPSK signal.
In this step, the target information bit corresponding to the DPSK signal may be obtained according to a mapping relationship between the target rotation angle value and the target information bit in the transmission information mapping table.
And 270, taking the target rotation angle value and the target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal.
The technical scheme of the embodiment of the invention includes that a DPSK signal to be processed is received, a cost function matched with the DPSK signal is constructed according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal, a demodulation function corresponding to the DPSK signal is constructed according to a signal expression corresponding to each IQ signal and the cost function, a transmission information mapping table matched with the DPSK signal is obtained according to a modulation mode corresponding to the DPSK signal, when the demodulation function value corresponding to the DPSK signal is maximum, a target rotation angle value corresponding to the DPSK signal is determined according to the transmission information mapping table, a target information bit corresponding to the DPSK signal is obtained in the transmission information mapping table according to the target rotation angle value corresponding to the DPSK signal, and the target rotation angle value and the target information bit corresponding to the DPSK signal are obtained in the transmission information mapping table, as a technical means of the demodulation result corresponding to the DPSK signal, the sensitivity of the receiver can be improved, and the complexity and the implementation cost of the DPSK signal demodulation process can be reduced.
EXAMPLE III
This embodiment is a further refinement of the above embodiment, and the same or corresponding terms as those of the above embodiment are explained, and this embodiment is not described again. Fig. 3a is a flowchart of a demodulation method of a DPSK signal provided in a third embodiment, in the third embodiment, the technical solution of the present embodiment may be combined with one or more methods in the solutions of the foregoing embodiments, as shown in fig. 3a, the method provided in the present embodiment may further include:
And step 320, constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal.
And 340, acquiring a residual frequency offset corresponding to the DPSK signal according to a demodulation function corresponding to the DPSK signal.
In this embodiment, the demodulation function corresponding to the DPSK signal is expressed as follows:
the residual frequency offset corresponding to the DPSK signal can be obtained by the demodulation function as follows:
wherein the content of the first and second substances,
for the corresponding residual frequency offset of the DPSK signal,
representing the angle determination of a complex signal.
And step 350, updating the residual frequency offset through a preset frequency offset tracking loop to obtain an updated demodulation function corresponding to the DPSK signal.
In this embodiment, the residual frequency offset may be updated by a preset frequency offset tracking loop, so that the residual frequency offset is stabilized within a preset interval. The advantage of this arrangement is that the receiving performance of the receiver can be improved, and the stability and robustness of the communication system can be improved.
In an implementation manner of the embodiment of the present invention, the structure diagram of the frequency offset tracking loop may be as shown in fig. 3b, and a Z-domain transfer function corresponding to the frequency offset tracking loop is
Said
The determination is made by the following formula:
wherein the content of the first and second substances,
is a predetermined constant value greater than zero, the constant value being associated with a bandwidth of the frequency offset tracking loop. In particular, the method comprises the following steps of,
the larger the bandwidth of the frequency offset tracking loop is, the faster the frequency offset tracking rate is.
In this embodiment, it is assumed that the residual frequency offset corresponding to the DPSK signal
The value of the starting frequency FreqOffset obtained after passing through the frequency offset tracking loop in fig. 3b is increased and then passed through the feedback path to enable the frequency offset to be increased
The size is reduced; on the contrary, if
The value of the starting frequency FreqOffset obtained after passing through the frequency offset tracking loop in fig. 3b is reduced and then passed through the feedback path to enable the frequency offset to be reduced
Becomes larger. Therefore, residual frequency offset can be caused by the frequency offset tracking loop on one hand
And the frequency is stabilized to be around 0, and on the other hand, the value of the starting frequency FreqOffset can be realized, so that the real frequency offset change can be tracked.
And 360, solving the updated demodulation function corresponding to the DPSK signal according to the modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal.
And 370, taking the target rotation angle value and the target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal.
The technical scheme of the embodiment of the invention includes that a DPSK signal to be processed is received, a cost function matched with the DPSK signal is constructed according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal, a demodulation function corresponding to the DPSK signal is constructed according to a signal expression corresponding to each IQ signal and the cost function, a residual frequency offset corresponding to the DPSK signal is obtained according to a demodulation function corresponding to the DPSK signal, the residual frequency offset is updated through a preset frequency offset tracking loop to obtain an updated demodulation function corresponding to the DPSK signal, the updated demodulation function corresponding to the DPSK signal is solved according to a modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal, and the target rotation angle value and the target information bit corresponding to the DPSK signal are obtained, as a technical means of the demodulation result corresponding to the DPSK signal, the sensitivity of the receiver can be improved, the complexity and the implementation cost of the DPSK signal demodulation process can be reduced, and the stability and the robustness of a communication system can be improved.
On the basis of the above embodiments, the demodulation method of the DPSK signal can be applied to an Enhanced Data Rate (EDR) mode under the bluetooth 5.1 standard. Specifically, the demodulation method of the DPSK signal may be implemented by a bluetooth chip, and the received power calculated by the bluetooth chip may be as shown in table 3:
TABLE 3
Table 3 may determine that the received power of the bluetooth chip is low, that is, the sensitivity of the bluetooth chip is high when demodulating the DPSK signal.
Example four
Fig. 4 is a structural diagram of a demodulation apparatus for a DPSK signal according to a fourth embodiment of the present invention, where the demodulation apparatus includes: a signal receiving module 410, a function construction module 420 and a demodulation module 430.
The signal receiving module 410 is configured to receive a DPSK signal to be processed, where the DPSK signal includes IQ signals corresponding to multiple times;
a function constructing module 420, configured to construct a cost function matched with the DPSK signal according to a preset constellation rotation angle and a preset frequency offset corresponding to the DPSK signal;
the demodulation module 430 is configured to solve the cost function according to a signal expression corresponding to each IQ signal, so as to obtain a demodulation result corresponding to the DPSK signal.
According to the technical scheme of the embodiment of the invention, the DPSK signal to be processed is received, the cost function matched with the DPSK signal is constructed according to the preset constellation diagram rotation angle and the preset frequency offset corresponding to the DPSK signal, and the cost function is solved according to the signal expression corresponding to each IQ signal to obtain the demodulation result corresponding to the DPSK signal.
On the basis of the foregoing embodiments, the function building module 420 may include:
and the cost function construction unit is used for constructing a cost function matched with the DPSK signal according to a signal expression respectively corresponding to a plurality of continuous IQ signals in the DPSK signal, a preset constellation diagram rotating angle corresponding to the DPSK signal and a preset frequency offset.
The demodulation module 430 may include:
a demodulation function construction unit, configured to construct a demodulation function corresponding to the DPSK signal according to a signal expression corresponding to each IQ signal and the cost function;
the function solving unit is used for solving a demodulation function corresponding to the DPSK signal according to a modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal;
a result determining unit, configured to use a target rotation angle value and a target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal;
the frequency offset obtaining unit is used for obtaining the residual frequency offset corresponding to the DPSK signal according to the demodulation function corresponding to the DPSK signal;
the frequency offset updating unit is used for updating the residual frequency offset through a preset frequency offset tracking loop to obtain an updated demodulation function corresponding to the DPSK signal; the Z-domain transfer function corresponding to the frequency deviation tracking loop is
Said
The determination is made by the following formula:
wherein the content of the first and second substances,
a preset constant value greater than zero, the constant value being associated with a bandwidth of the frequency offset tracking loop;
the updating function solving unit is used for solving an updated demodulation function corresponding to the DPSK signal according to a modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal;
the mapping table acquiring unit is used for acquiring a transmission information mapping table matched with the DPSK signal according to a modulation mode corresponding to the DPSK signal; the transmission information mapping table comprises a plurality of alternative rotation angle values corresponding to the DPSK signals and alternative information bits matched with the alternative rotation angle values;
a target angle value determining unit, configured to determine, according to the multiple candidate rotation angle values in the transmission information mapping table, a target rotation angle value corresponding to the DPSK signal when a demodulation function value corresponding to the DPSK signal is maximum;
and the target information acquisition unit is used for acquiring a target information bit corresponding to the DPSK signal in the transmission information mapping table according to the target rotation angle value corresponding to the DPSK signal.
The demodulation device for the DPSK signal provided by the embodiment of the invention can execute the demodulation method for the DPSK signal provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a computer apparatus according to a fifth embodiment of the present invention, as shown in fig. 5, the computer apparatus includes a processor 510, a memory 520, an input device 530, and an output device 540; the number of the processors 510 in the computer device may be one or more, and one processor 510 is taken as an example in fig. 5; the processor 510, the memory 520, the input device 530 and the output device 540 in the computer apparatus may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5. The memory 520 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to a demodulation method of a DPSK signal in any embodiment of the present invention (for example, the signal receiving module 410, the function constructing module 420, and the demodulating module 430 in a demodulation apparatus of a DPSK signal). The processor 510 executes various functional applications and data processing of the computer device by executing software programs, instructions and modules stored in the memory 520, so as to implement a demodulation method of a DPSK signal as described above. That is, the program when executed by the processor implements:
receiving a DPSK signal to be processed, wherein the DPSK signal comprises IQ signals corresponding to a plurality of moments;
constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
The memory 520 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 520 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 520 may further include memory located remotely from processor 510, which may be connected to a computer device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The input device 530 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer apparatus, and may include a keyboard and a mouse, etc. The output device 540 may include a display device such as a display screen.
EXAMPLE six
The sixth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method according to any embodiment of the present invention. Of course, the embodiments of the present invention provide a computer-readable storage medium, which can perform related operations in a method for demodulating a DPSK signal provided in any embodiment of the present invention. That is, the program when executed by the processor implements:
receiving a DPSK signal to be processed, wherein the DPSK signal comprises IQ signals corresponding to a plurality of moments;
constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the above embodiment of the demodulation apparatus for a DPSK signal, the units and modules included in the demodulation apparatus are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of demodulating a DPSK signal, comprising:
receiving a DPSK signal to be processed, wherein the DPSK signal comprises IQ signals corresponding to a plurality of moments;
constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and solving the cost function according to a signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
2. The method of claim 1, wherein solving the cost function according to a signal expression corresponding to each of the IQ signals to obtain a demodulation result corresponding to the DPSK signal comprises:
constructing a demodulation function corresponding to the DPSK signal according to a signal expression corresponding to each IQ signal and the cost function;
solving a demodulation function corresponding to the DPSK signal according to a modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal;
and taking the target rotation angle value and the target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal.
3. The method according to claim 2, wherein solving the demodulation function corresponding to the DPSK signal according to the modulation scheme corresponding to the DPSK signal to obtain the target rotation angle value and the target information bit corresponding to the DPSK signal comprises:
acquiring residual frequency offset corresponding to the DPSK signal according to a demodulation function corresponding to the DPSK signal;
updating the residual frequency offset through a preset frequency offset tracking loop to obtain an updated demodulation function corresponding to the DPSK signal;
and solving the updated demodulation function corresponding to the DPSK signal according to the modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal.
4. The method according to claim 2, wherein solving the demodulation function corresponding to the DPSK signal according to the modulation scheme corresponding to the DPSK signal to obtain the target rotation angle value and the target information bit corresponding to the DPSK signal comprises:
acquiring a transmission information mapping table matched with the DPSK signal according to a modulation mode corresponding to the DPSK signal; the transmission information mapping table comprises a plurality of alternative rotation angle values corresponding to the DPSK signals and alternative information bits matched with the alternative rotation angle values;
determining a target rotation angle value corresponding to the DPSK signal when a demodulation function value corresponding to the DPSK signal is maximum according to a plurality of alternative rotation angle values in the transmission information mapping table;
and acquiring a target information bit corresponding to the DPSK signal in the transmission information mapping table according to the target rotation angle value corresponding to the DPSK signal.
5. The method of claim 3, wherein the Z-domain transfer function for the frequency offset tracking loop is
Said
The determination is made by the following formula:
wherein the content of the first and second substances,
is a predetermined constant value greater than zero, the constant value being associated with a bandwidth of the frequency offset tracking loop.
6. The method of claim 1, wherein constructing the cost function matched to the DPSK signal according to a preset constellation rotation angle and a preset frequency offset corresponding to the DPSK signal comprises:
and constructing a cost function matched with the DPSK signal according to a signal expression respectively corresponding to a plurality of continuous IQ signals in the DPSK signal, a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal.
7. An apparatus for demodulating a DPSK signal, comprising:
the device comprises a signal receiving module, a processing module and a processing module, wherein the signal receiving module is used for receiving a DPSK signal to be processed, and the DPSK signal comprises IQ signals corresponding to a plurality of moments;
the function construction module is used for constructing a cost function matched with the DPSK signal according to a preset constellation diagram rotation angle and a preset frequency offset corresponding to the DPSK signal;
and the demodulation module is used for solving the cost function according to the signal expression corresponding to each IQ signal to obtain a demodulation result corresponding to the DPSK signal.
8. The apparatus of claim 7, wherein the demodulation module comprises:
a demodulation function construction unit, configured to construct a demodulation function corresponding to the DPSK signal according to a signal expression corresponding to each IQ signal and the cost function;
the function solving unit is used for solving a demodulation function corresponding to the DPSK signal according to a modulation mode corresponding to the DPSK signal to obtain a target rotation angle value and a target information bit corresponding to the DPSK signal;
and the result determining unit is used for taking the target rotation angle value and the target information bit corresponding to the DPSK signal as a demodulation result corresponding to the DPSK signal.
9. A computer device, comprising:
one or more processors;
storage means for storing one or more programs;
the one or more programs when executed by the one or more processors cause the one or more processors to implement a method of demodulating a DPSK signal as recited in any one of claims 1-6, when the program is executed.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out a method of demodulating a DPSK signal as set forth in any one of claims 1 to 6.
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