CN114363134B - Signal demodulation method and device, electronic equipment and storage medium - Google Patents
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Abstract
The invention discloses a signal demodulation method, a signal demodulation device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter; determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal; determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy; and demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal. Namely, the embodiment of the invention determines the sampling method and the equalization method through the demodulation parameter and the modulation parameter, determines the inter-symbol interference coefficient, selects a proper equalization mode, ensures the equalization effect and reduces the complexity of the equalization method adopted when the signal is in low power consumption.
Description
Technical Field
The embodiment of the invention relates to a communication technology, in particular to a signal demodulation method, a signal demodulation device, electronic equipment and a storage medium.
Background
The continuous phase modulation (Continuous Phase Modulation, CPM) in the technical field of communication has the characteristics of constant envelope, fast power spectrum sidelobe attenuation, flexible and various modulation formats and the like, and is widely applied to low-power wireless transmission networks such as Bluetooth, low-power wide area network LPWAN and the like. The CPM may control indexes such as a transmission rate, a power spectrum shape, and a bandwidth size of the CPM signal by using modulation parameters such as a modulation index, a modulation order, and a frequency pulse type. Because of flexible variability of the CPM modulation method, challenges are brought to the design of a demodulation scheme of the CPM signal, and meanwhile, the low power consumption limits the available demodulation method of the CPM receiving device to a certain extent.
Disclosure of Invention
The invention provides a signal demodulation method, a device, electronic equipment and a storage medium, which are used for demodulating CPM signals with different modulation formats by different strategies, so that the demodulation performance is ensured and the implementation complexity of the demodulation method is minimized.
In a first aspect, an embodiment of the present invention provides a signal demodulation method, applied to a signal receiver, where the method includes:
Acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter;
determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal.
Further, determining the delay time of the first signal according to the modulation parameter includes:
and determining the delay time of the first signal according to the modulation parameter and the delay sampling table.
Further, determining the phase difference of the first signal according to the delay time and the phase of the signal includes:
determining the phase of the first signal and the continuous time of the first signal, and calculating the actual time according to the continuous time and the delay time;
And determining a delay phase of the first signal according to the actual time, and determining a phase difference of the first signal according to the phase of the first signal and the delay phase of the first signal.
Further, determining the phase difference of the first signal according to the phase of the first signal and the delayed phase of the first signal includes:
determining a difference between a phase of the first signal and a delay phase of the first signal, determining whether the difference is greater than pi or less than-pi;
when the difference value is larger than pi, subtracting a phase value of 2 pi from the difference value to serve as a phase difference of the first signal;
and when the difference value is smaller than-pi, adding a phase value of 2 pi to the difference value as a phase difference of the first signal.
Further, determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter includes:
and searching a demodulation strategy table according to the demodulation parameters and the modulation parameters to determine a demodulation strategy corresponding to the first signal.
Further, searching a demodulation policy table according to the demodulation parameter and the modulation parameter to determine a demodulation policy corresponding to the first signal, including:
Inquiring a symbol sampling table in the demodulation strategy table according to the demodulation parameters to determine a target sampling strategy corresponding to the first signal;
and searching an equalization type table in the demodulation strategy table according to the modulation parameters to determine a target equalization strategy corresponding to the first signal.
Further, demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain the second signal, including:
determining symbol statistics corresponding to the first signal according to the target sampling strategy and the phase difference, and determining an intersymbol interference coefficient according to the symbol sequence number of the symbol statistics;
and demodulating the first signal according to the inter-symbol interference coefficient, the symbol statistic and the target equalization strategy to obtain the second signal.
In a second aspect, an embodiment of the present invention further provides a signal demodulation apparatus, including:
the delay determining module is used for acquiring a first signal and a modulation parameter of the first signal and determining delay time of the first signal according to the modulation parameter;
the signal synchronization module is used for determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain demodulation parameters of the first signal;
The strategy determining module is configured to determine a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, where the demodulation strategy corresponding to the first signal includes: a target sampling strategy and a target equalization strategy;
and the signal demodulation module is used for demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
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 the signal demodulation method.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the signal demodulation method.
According to the embodiment of the invention, the first signal and the modulation parameter of the first signal are obtained, and the delay time of the first signal is determined according to the modulation parameter; determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal; determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy; and demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal. In other words, the embodiment of the invention determines the target sampling method and the target equalization method through the demodulation parameter and the modulation parameter, can accurately determine the inter-symbol interference coefficient corresponding to the signal according to the target sampling method, can effectively reduce the inter-symbol interference in the equalization process, determines the inter-symbol interference coefficient, and selects a proper equalization mode, thereby ensuring the equalization effect and reducing the complexity of the equalization method adopted when the signal is in low power consumption.
Drawings
Fig. 1 is a schematic flow chart of a signal demodulation method according to an embodiment of the present invention;
fig. 2 is another flow chart of a signal demodulation method according to an embodiment of the present invention;
fig. 2A is a schematic diagram of a signal demodulation method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal demodulation device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic flow chart of a signal demodulation method according to an embodiment of the present invention, where the method may be performed by a signal demodulation apparatus according to an embodiment of the present invention, and the apparatus may be implemented in software and/or hardware. In a specific embodiment, the apparatus may be integrated in an electronic device, which may be a server, for example. The following embodiments will be described taking the example of the integration of the apparatus in an electronic device, and referring to fig. 1, the method may specifically include the following steps:
S110, acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter;
for example, the first signal may be from a signal receiving apparatus, which may be a receiver, a terminal, or the like having a signal receiving function, and the first signal may be a CPM signal transmitted from a base station to the receiver. The CPM signal is a continuous signal modulated by a generalized modulation scheme (i.e., a continuous phase modulation scheme) of phase modulation information. The modulation parameter of the first signal is a CPM modulation format that the base station transmits to the receiver before the signal receiving device receives the first signal. The CPM modulation format comprises a frequency pulse function g (n), a modulation order M and a modulation index h. The delay time of the first signal may be understood as the length of the delay time of the received signal at each phase.
In a specific implementation, the receiving device receives the modulation parameter of the first signal and the first signal respectively, and may calculate the delay time of the first signal according to the modulation parameter of the first signal. Wherein the delay time is greater than zero and less than the duration of the frequency pulse function g (n). The delay time of the first signal is determined according to the modulation parameter of the first signal, so that the phase difference is calculated according to the delay time of the first signal.
S120, determining a phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
by way of example, the phase of the first signal may be understood as reflecting the signal strength and direction change in the time dimension, also as a logarithmic measure of the waveform change of the signal, i.e. the phase of the first signal describes the position in the wave where the waveform cycle is located at any instant, which position may be a peak, a trough or any scale between peaks and troughs. The phase difference of the first signal may be understood as the phase difference of the first signal after a delay time, i.e. the difference between the phase of the first signal and the delay phase of the first signal. The delay phase of the first signal is the phase of the first signal delayed by a delay time. The demodulation parameters of the first signal can be understood as the offset estimate TO, the frequency offset estimate FO and the modulation index estimate H output during the synchronization of the first signal.
In a specific implementation, the first signal is estimated, and the phase of the first signal is calculated. And determining the delay phase of the first signal according to the delay time of the first signal, performing difference on the phase of the first signal and the delay signal of the first signal, and calculating the phase difference of the first signal. And according to the difference between the phase of the first signal and the delay signal of the first signal, obtaining the difference between the phase of the first signal and the delay signal of the first signal, and according to the difference between the phase of the first signal and the delay signal of the first signal, performing range adjustment to obtain the phase difference of the first signal. The phase difference of the first signal is utilized to adjust the first signal, so that symbol timing synchronization and frequency synchronization of the first signal are realized, incoherent demodulation is realized, demodulation parameters of the first signal are determined, and a strategy of symbol sampling can be determined by utilizing the demodulation parameters of the first signal.
S130, determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
by way of example, the corresponding demodulation strategy of the first signal may be understood as a target scheme for demodulating the first signal, which scheme comprises a symbol sampling strategy for the signal and a strategy for equalizing the signal. The target sampling strategy may be understood as a sampling scheme corresponding to the first signal, which is determined according to the demodulation parameters, and has a type of symbol sampling. The target equalization strategy may be understood as an equalization method corresponding to the first signal determined according to the demodulation parameter, and has an equalization type.
In a specific implementation, the phase difference of the first signal is utilized to adjust the first signal to determine a demodulation parameter of the first signal, and the modulation parameter of the first signal is determined according to a CPM modulation format sent to the receiver by the base station. And selecting a demodulation strategy corresponding to the first signal by using the demodulation parameters and the modulation parameters for demodulating the first signal.
And S140, demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal.
In a specific implementation, the second signal may be understood as a signal after demodulation of the first signal, and is used for the receiving terminal and the receiver to obtain useful information in the first signal. And determining the sampling type and the equalization type for demodulating the first signal according to the target sampling strategy and the target equalization strategy in the demodulation strategy corresponding to the first signal. And calculating an intersymbol interference coefficient and a symbol statistic of the first signal according to the sampling type, and performing symbol equalization by using the intersymbol interference coefficient and the symbol statistic by utilizing the equalization type to finish demodulation of a modulation value of the first signal so as to obtain a second signal.
According to the embodiment of the invention, the first signal and the modulation parameter of the first signal are obtained, and the delay time of the first signal is determined according to the modulation parameter; determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal; determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy; and demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal. In other words, the embodiment of the invention determines the target sampling method and the target equalization method through the demodulation parameter and the modulation parameter, can accurately determine the inter-symbol interference coefficient corresponding to the signal according to the target sampling method, can effectively reduce the inter-symbol interference in the equalization process, determines the inter-symbol interference coefficient, and selects a proper equalization mode, thereby ensuring the equalization effect and reducing the complexity of the equalization method adopted when the signal is in low power consumption.
The signal demodulation method provided by the embodiment of the invention is further described below, as shown in fig. 2, and the method specifically includes the following steps:
s210, acquiring a first signal and a modulation parameter of the first signal, and determining the delay time of the first signal according to the modulation parameter and a delay sampling table;
in a specific implementation, the delay sampling table may be understood as a comparison table which is calculated according to different modulation parameters and the corresponding delay time and is made according to different modulation parameters and the delay time, and is used for directly reading the corresponding delay time according to the modulation parameters. And acquiring the modulation parameters of the first signal, and acquiring the first signal according to the modulation parameters of the first signal. And matching the delay time of the first signal in a delay sampling table according to the modulation parameter. For example, when the first signal is a modulation parameter corresponding to the CPFSK signal, the delay time takes a time corresponding to the number of sampling points of each symbol; when the first signal is a gaussian frequency pulse function or second order modulation with BT of 0.25, the delay time takes a time corresponding to 2 times of the number of sampling points of each symbol.
S220, determining the phase of the first signal and the continuous time of the first signal, and calculating the actual time according to the continuous time and the delay time;
In a specific implementation, the actual time may be understood as a time corresponding to the delay phase of each moment after the duration of the first signal is delayed. The continuous time of the first signal is the duration of the semaphore of the first signal in the time dimension. And determining the continuous time of the first signal from the information of the received first signal, determining the phase of the first signal according to an iterative estimation algorithm, and determining the actual time after corresponding delay of each moment point by using the duration time and the delay time of the first signal so as to determine the delay phase of the first signal according to the actual time and determine the phase difference of the first signal.
S230, determining a delay phase of the first signal according to the actual time, and determining a phase difference of the first signal according to the phase of the first signal and the delay phase of the first signal;
in the concrete implementation, the actual time is replacedAnd determining the delay phase of the first signal in a phase formula, wherein the delay phase of the first signal is the phase of the first signal delayed by a delay time. And obtaining a difference value between the phase of the first signal and the delay phase of the first signal according to the difference value between the phase of the first signal and the delay phase of the first signal, and carrying out phase adjustment according to the difference value between the phase of the first signal and the delay phase of the first signal to obtain a phase difference of the first signal. Such as: the delay time is delta n, the phase theta (n) of the first signal is calculated according to the first signal y (n), the continuous time of the first signal is determined to be n, and the actual time is n-delta n. Determining a delay phase Θ (n- Δn) of the first signal, determining a phase difference ΔΘ of the first signal from a difference Θ (n) - Θ (n- Δn) of the phase of the first signal and from Θ (n) - Θ (n- Δn) Δn (n)。
Further, determining the phase difference of the first signal based on the phase of the first signal and the delayed phase of the first signal includes:
determining a difference between the phase of the first signal and the delay phase of the first signal, and determining whether the difference is greater than pi or less than-pi;
when the difference value is larger than pi, subtracting the phase value of 2 pi from the difference value to serve as the phase difference of the first signal;
when the difference is smaller than-pi, the phase value of 2 pi is added to the difference as the phase difference of the first signal.
In a specific implementation, the phase difference is the difference between two alternating current phases with the same frequency, the value range of the phase difference is the same as the initial phase, the absolute value is less than or equal to pi, and the difference between the phase of the first signal and the delay phase of the first signal is determined by adding or subtracting 2 pi to the requirement of exceeding the range, so that the difference between the first signal is determined according to the value range of the phase. Determining whether the difference value between the phase of the first signal and the delay phase of the first signal is greater than pi or less than pi, and subtracting the phase value of 2 pi from the difference value to serve as the phase difference of the first signal when the difference value is greater than pi; when the difference value is smaller than-pi, the phase value of the difference value plus 2 pi is used as the phase difference of the first signal beyond the value range of the phase difference. Such as: when the first is When the difference value theta (n) -theta (n-delta n) > pi between the phase of the signal and the delay phase of the first signal, the phase difference delta theta of the first signal Δn (n) =Θ (n) - Θ (n- Δn) -2pi; when the phase of the first signal is different from the delay phase of the first signal, the difference value Θ (n) - Θ (n-Deltan)<At-pi, ΔΘ Δn (n)＝Θ(n)-Θ(n-Δn)+2π。
S240, synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
s250, searching a demodulation strategy table according to the demodulation parameters and the modulation parameters to determine a demodulation strategy corresponding to the first signal, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
in a specific implementation, the demodulation policy table may be understood as a sampling policy and an equalization policy that correspond to different intervals or values where different demodulation parameters and modulation parameters are located, respectively, and are used for determining a target sampling policy of the first signal and a target equalization policy of the first signal in sequence according to the demodulation parameters and the modulation parameters. And adjusting the first signal by utilizing the phase difference of the first signal to determine the demodulation parameter of the first signal, and determining the first signal modulation parameter according to the CPM modulation format sent to the receiver by the base station. And searching a demodulation strategy table by using the demodulation parameters and the modulation parameters to obtain a demodulation strategy corresponding to the first signal, and determining a sampling strategy and an equalization strategy corresponding to the first signal.
Further, searching a demodulation strategy table according to the demodulation parameter and the modulation parameter to determine a demodulation strategy corresponding to the first signal, including:
inquiring a symbol sampling table in a demodulation strategy table according to the demodulation parameters to determine a target sampling strategy corresponding to the first signal;
and searching an equalization type table in the demodulation strategy table according to the modulation parameters to determine a target equalization strategy corresponding to the first signal.
For example, the symbol sampling table may be understood as a comparison table made according to intervals or values where different demodulation parameters are located and corresponding to different sampling types, and the comparison table is used for determining a target sampling strategy (i.e. sampling type) corresponding to the first signal according to the demodulation parameters. The equalization type table can be understood as a comparison table made according to different equalization types corresponding to the intervals or values of different modulation parameters, and is used for determining the target equalization strategy (i.e. equalization type) corresponding to the first signal according to the modulation parameters
In a specific implementation, the demodulation policy table includes a symbol sampling table and an equalization type table, and the symbol sampling table is used for inquiring the symbol sampling table according to the demodulation parameter, and when the symbol sampling table in the demodulation policy table is searched according to the demodulation parameter, the symbol sampling policy in the symbol sampling table corresponding to the demodulation parameter of the first signal is determined as the target sampling policy corresponding to the first signal. When the equalization type table in the demodulation policy table is searched according to the modulation parameters, the equalization policy in the equalization samples corresponding to the modulation parameters of the first signal is determined as the target sampling policy corresponding to the first signal, so that proper policies are selected in sequence according to the demodulation parameters and the modulation parameters, and the complexity of the demodulation policy can be reduced while the demodulation performance is ensured.
For example, a symbol sampling table in a demodulation policy table is queried according to a demodulation parameter to determine a target sampling policy corresponding to the first signal, and the symbol sampling policy in the demodulation policy table is shown in the following table 1:
table 1 symbol sample table in demodulation strategy table
The first column is a comparison interval corresponding TO the modulation index estimation value H, the second column is a comparison interval corresponding TO the time offset estimation value TO, and the third column is a comparison interval corresponding TO the frequency offset estimation value FO, and the types of symbol samples corresponding TO the intervals of the modulation index estimation value H, the time offset estimation value TO and the frequency offset estimation value FO in the demodulation parameters are determined according TO the modulation index estimation value H, the time offset estimation value TO and the frequency offset estimation value FO. When the symbol sampling type is 1, the peak position sampling is adopted; when the symbol sample type is 2, a matched filter sample is indicated.
For example, a target equalization strategy corresponding to the first signal is determined by looking up an equalization type table in a demodulation strategy table according to the modulation parameter, and the equalization strategy in the specific demodulation strategy table is shown in the following table 2:
table 2 equalization type table in demodulation policy table
The first column is a modulation order M value, the second column is a frequency pulse waveform g (n), the third column is a section corresponding to a modulation index estimator H value, and the fourth column is a value corresponding to an equalization type. And determining the equalization type of the first signal according to the value and the interval range corresponding to the modulation order M, the frequency pulse waveform g (n) and the modulation index estimator H in the modulation parameters. When the equalization type is 1, the threshold hard judgment equalization is adopted; when the equalization type is 2, linear equalization is adopted; when the equalization type is 3, decision feedback equalization is adopted; when the equalization type is 4, the viterbi equalization is used.
Step 260, demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain the second signal.
Further, demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal, including:
determining symbol statistics corresponding to the first signal according to a target sampling strategy and the phase difference, and determining an intersymbol interference coefficient according to a symbol sequence number of the symbol statistics;
and demodulating the first signal according to the intersymbol interference coefficient, the symbol statistic and the target equalization strategy to obtain a second signal.
Illustratively, the symbol statistics corresponding to the first signal may understand statistics obtained by sampling the phase difference at the first peak position sampling point according to the sampling type according to the symbol period, for determining the difference between the symbols. Inter-symbol interference coefficients can be understood as the coefficients of the pulse amplitude modulated signal superposition of the base pulse with inter-symbol interference for canceling the inter-symbol interference.
In specific implementation, a symbol sampling table in a demodulation strategy table is searched according to the demodulation parameters, and a symbol sampling strategy in the symbol sampling table corresponding to the demodulation parameters of the first signal is determined as a target sampling strategy corresponding to the first signal. And determining the distance between peaks of the differential phase waveform of the first signal according to the target sampling strategy and the phase difference of the first signal, and determining the symbol statistic corresponding to the first signal according to the distance value. And determining an inter-symbol interference coefficient corresponding to the first signal according to the distance value, the differential phase waveform of the first signal and the delay time of the first signal. And demodulating the first signal modulation value by using the inter-symbol interference coefficient and the symbol statistic according to the target equalization strategy to obtain a second signal.
By way of example, when the symbol sample type is 1, it is indicated that peak position sampling is employed; calculating a symbol start position from the first signal and a phase differential waveform p of the first signal Δn Distance of peak position of (n)Wherein (1)>Is rounded down. The phase difference delta theta for the first signal at the d-th sample point after each symbol start position Δn (n) sampling according to symbol period to obtain x (l) =ΔΘ Δn (d+s x l), where l is the symbol number. According to the phase differential waveform p of the first signal Δn (n) and distance d to calculate inter-symbol interference coefficient isicouff=p Δn (d: S: L. Times.S+Deltan), i.e. the phase differential waveform p of the first signal Δn (n) taking a value every S sampling points from d sampling points until the phase differential waveform p of the first signal Δn End of (n). When the symbol sample type is 2, it represents a matched filtered sample, according to the phase difference ΔΘ of the first signal Δn (n) and the phase differential waveform p of the first signal Δn Convolution of (n)> The convolution c (n) is sampled at the d=l×s+Δn sampling points after each symbol start position by a symbol period to obtain x (L) =c (d+s×l), where L is the symbol number. According to the phase differential waveform p of the first signal Δn (n) calculating p Δn (n) autocorrelation functionAccording to the phase differential waveform p of the first signal Δn (n) and distance d, the inter-symbol interference coefficient isiioeff=ρ (d: S:2l×s+2Δn), i.e. a value is taken for the phase differential waveform ρ (n) of the first signal every S sampling points from the distance d sampling point until the end of the phase differential waveform ρ (n) of the first signal.
Fig. 2A is a schematic diagram of a signal demodulation method according to an embodiment of the present invention, where, as shown in fig. 2A, a first signal and a modulation parameter of the first signal are obtained, and delay calculation is performed according to the modulation parameter of the first signal, so as to obtain a delay time of the first signal. And performing phase difference calculation according to the first signal and the delay time to obtain the phase difference of the first signal. And synchronizing the first signal according to the phase difference of the first signal to obtain the demodulation parameter of the first signal. And obtaining a demodulation strategy of the first signal according to the demodulation parameter of the first signal and the adjustment parameter of the first signal, and performing symbol sampling according to a target sampling strategy in the demodulation strategy of the first signal to obtain an intersymbol interference coefficient and a symbol statistic. And demodulating the first signal by using the inter-symbol interference coefficient and the symbol statistic according to a target equalization strategy in the demodulation strategy of the first signal to obtain a second signal.
According to the embodiment of the invention, the first signal and the modulation parameter of the first signal are obtained, and the delay time of the first signal is determined according to the modulation parameter; determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal; determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy; and demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal. In other words, the embodiment of the invention determines the target sampling method and the target equalization method through the demodulation parameter and the modulation parameter, can accurately determine the inter-symbol interference coefficient corresponding to the signal according to the target sampling method, can effectively reduce the inter-symbol interference in the equalization process, determines the inter-symbol interference coefficient, and selects a proper equalization mode, thereby ensuring the equalization effect and reducing the complexity of the equalization method adopted when the signal is in low power consumption.
Fig. 3 is a schematic structural diagram of a signal demodulation device according to an embodiment of the present invention, and as shown in fig. 3, the signal demodulation device includes:
A delay determining module 310, configured to obtain a first signal and a modulation parameter of the first signal, and determine a delay time of the first signal according to the modulation parameter;
a signal synchronization module 320, configured to determine a phase difference of the first signal according to the delay time and the phase of the first signal, and synchronize the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
a policy determining module 330, configured to determine a demodulation policy corresponding to the first signal according to the demodulation parameter and the modulation parameter, where the demodulation policy corresponding to the first signal includes: a target sampling strategy and a target equalization strategy;
the signal demodulation module 340 is configured to demodulate the first signal according to the target sampling strategy and the target equalization strategy, so as to obtain a second signal.
In one embodiment, the delay determining module 310 determines the delay time of the first signal according to the modulation parameter, including:
and determining the delay time of the first signal according to the modulation parameter and the delay sampling table.
In one embodiment, the signal synchronization module 320 determines the phase difference of the first signal according to the delay time and the phase of the signal, including:
Determining the phase of the first signal and the continuous time of the first signal, and calculating the actual time according to the continuous time and the delay time;
and determining a delay phase of the first signal according to the actual time, and determining a phase difference of the first signal according to the phase of the first signal and the delay phase of the first signal.
In one embodiment, the signal synchronization module 320 determines the phase difference of the first signal according to the phase of the first signal and the delay phase of the first signal, including:
determining a difference between a phase of the first signal and a delay phase of the first signal, determining whether the difference is greater than pi or less than-pi;
when the difference value is larger than pi, subtracting a phase value of 2 pi from the difference value to serve as a phase difference of the first signal;
and when the difference value is smaller than-pi, adding a phase value of 2 pi to the difference value as a phase difference of the first signal.
In one embodiment, the determining module 330 determines, according to the demodulation parameter and the modulation parameter, a demodulation policy corresponding to the first signal, including:
and searching a demodulation strategy table according to the demodulation parameters and the modulation parameters to determine a demodulation strategy corresponding to the first signal.
In an embodiment, the determining module 330 searches a demodulation policy table according to the demodulation parameter and the modulation parameter to determine a demodulation policy corresponding to the first signal, including:
inquiring a symbol sampling table in the demodulation strategy table according to the demodulation parameters to determine a target sampling strategy corresponding to the first signal;
and searching an equalization type table in the demodulation strategy table according to the modulation parameters to determine a target equalization strategy corresponding to the first signal.
In one embodiment, the signal demodulation module 340 demodulates the first signal according to the target sampling strategy and the target equalization strategy to obtain the second signal, including:
determining symbol statistics corresponding to the first signal according to the target sampling strategy and the phase difference, and determining an intersymbol interference coefficient according to the symbol sequence number of the symbol statistics;
and demodulating the first signal according to the inter-symbol interference coefficient, the symbol statistic and the target equalization strategy to obtain the second signal.
According to the embodiment of the device, the first signal and the modulation parameter of the first signal are obtained, and the delay time of the first signal is determined according to the modulation parameter; determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal; determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy; and demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal. In other words, the embodiment of the invention determines the target sampling method and the target equalization method through the demodulation parameter and the modulation parameter, can accurately determine the inter-symbol interference coefficient corresponding to the signal according to the target sampling method, can effectively reduce the inter-symbol interference in the equalization process, determines the inter-symbol interference coefficient, and selects a proper equalization mode, thereby ensuring the equalization effect and reducing the complexity of the equalization method adopted when the signal is in low power consumption.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Fig. 4 illustrates a block diagram of an exemplary electronic device 12 suitable for use in implementing embodiments of the present invention. The electronic device 12 shown in fig. 4 is merely an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 4, the electronic device 12 is in the form of a general purpose computing device. Components of the electronic device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Electronic device 12 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by electronic device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The electronic device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard disk drive"). Although not shown in fig. 4, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the embodiments described herein.
The electronic device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the electronic device 12, and/or any devices (e.g., network card, modem, etc.) that enable the electronic device 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. Also, the electronic device 12 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through a network adapter 20. As shown, the network adapter 20 communicates with other modules of the electronic device 12 over the bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running a program stored in the system memory 28, for example, implementing a signal demodulation method provided in an embodiment of the present invention, and is applied to a signal receiver, and includes:
Acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter;
determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, the program when executed by a processor implementing the signal demodulation method, the method comprising:
acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter;
determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal;
Determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A signal demodulation method, applied to a signal receiver, comprising:
acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter, wherein the modulation parameter of the first signal comprises a CPM modulation format received and acquired from a base station; determining a phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain a demodulation parameter of the first signal, wherein the demodulation parameter of the first signal comprises a deviation estimated value, a frequency deviation estimated value and a modulation index estimated value which are output in the process of synchronizing the first signal;
Determining a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, wherein the demodulation strategy corresponding to the first signal comprises: a target sampling strategy and a target equalization strategy;
demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal;
the determining, according to the demodulation parameter and the modulation parameter, a demodulation policy corresponding to the first signal includes: inquiring a symbol sampling table in a demodulation strategy table according to the demodulation parameters to determine a target sampling strategy corresponding to the first signal, and searching an equalization type table in the demodulation strategy table according to the modulation parameters to determine a target equalization strategy corresponding to the first signal;
demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal, including: determining symbol statistics corresponding to the first signal according to the target sampling strategy and the phase difference, and determining an intersymbol interference coefficient according to the symbol sequence number of the symbol statistics; and demodulating the first signal according to the inter-symbol interference coefficient, the symbol statistics and the target equalization strategy to obtain the second signal.
2. The method of claim 1, wherein determining the delay time of the first signal based on the modulation parameter comprises:
and determining the delay time of the first signal according to the modulation parameter and the delay sampling table.
3. The method of claim 1, wherein determining the phase difference of the first signal based on the delay time and the phase of the signal comprises:
determining the phase of the first signal and the continuous time of the first signal, and calculating the actual time according to the continuous time and the delay time;
and determining a delay phase of the first signal according to the actual time, and determining a phase difference of the first signal according to the phase of the first signal and the delay phase of the first signal.
4. A method according to claim 3, wherein determining the phase difference of the first signal from the phase of the first signal and the delayed phase of the first signal comprises:
determining a difference between a phase of the first signal and a delay phase of the first signal, determining whether the difference is greater than pi or less than-pi;
when the difference value is larger than pi, subtracting a phase value of 2 pi from the difference value to serve as a phase difference of the first signal;
And when the difference value is smaller than-pi, adding a phase value of 2 pi to the difference value as a phase difference of the first signal.
5. A signal demodulation apparatus, comprising:
the delay determining module is used for acquiring a first signal and a modulation parameter of the first signal, and determining delay time of the first signal according to the modulation parameter, wherein the modulation parameter of the first signal comprises a CPM modulation format acquired by receiving from a base station;
the signal synchronization module is used for determining the phase difference of the first signal according to the delay time and the phase of the first signal, and synchronizing the first signal according to the phase difference of the first signal to obtain the demodulation parameter of the first signal, wherein the demodulation parameter of the first signal comprises a deviation estimated value, a frequency deviation estimated value and a modulation index estimated value which are output in the process of synchronizing the first signal;
the strategy determining module is configured to determine a demodulation strategy corresponding to the first signal according to the demodulation parameter and the modulation parameter, where the demodulation strategy corresponding to the first signal includes: a target sampling strategy and a target equalization strategy;
the signal demodulation module is used for demodulating the first signal according to the target sampling strategy and the target equalization strategy to obtain a second signal;
The policy determining module is specifically configured to: inquiring a symbol sampling table in a demodulation strategy table according to the demodulation parameters to determine a target sampling strategy corresponding to the first signal, and searching an equalization type table in the demodulation strategy table according to the modulation parameters to determine a target equalization strategy corresponding to the first signal;
the signal demodulation module is specifically used for: determining symbol statistics corresponding to the first signal according to the target sampling strategy and the phase difference, and determining an intersymbol interference coefficient according to the symbol sequence number of the symbol statistics; and demodulating the first signal according to the inter-symbol interference coefficient, the symbol statistics and the target equalization strategy to obtain the second signal.
6. An electronic device, the electronic device comprising:
one or more processors;
storage means for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the signal demodulation method of any one of claims 1 to 4.
7. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the signal demodulation method according to any one of claims 1 to 4.
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