CN115065380A - Pseudo code synchronization method and device, electronic equipment and storage medium - Google Patents
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Abstract
The embodiment of the application discloses a pseudo code synchronization method and device, electronic equipment and a storage medium. Obtaining a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization; acquiring pseudo code signals of a phase lag branch, a phase middle branch and a phase lead branch generated by a pseudo code generator; aiming at the pseudo code signals of each branch, overlapping the pseudo code signals of the branch with the integral square of the product of the spread spectrum signals of different branches to obtain synchronous judgment data of the pseudo code signals of the branch; and adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches, so that the pseudo code signal of the middle branch of the adjusted phase is synchronous with the spread spectrum signal of the same-phase branch. The embodiment of the application improves the pseudo code synchronization precision.
Description
Technical Field
The embodiment of the application relates to a signal processing technology, in particular to a pseudo code synchronization method, a pseudo code synchronization device, electronic equipment and a storage medium.
Background
The uplink signal system of the european loop system is Code Division Multiple Access (CDMA), which is a communication method based on Direct Sequence Spread Spectrum (DSSS) technology, and the carrier at the transmitting end is modulated by both baseband digital signals and pseudo codes.
Usually, the receiving end needs to perform carrier synchronization before performing pseudo code synchronization. Phase difference can be introduced in the carrier synchronization process, and the pseudo code synchronization precision is influenced.
Disclosure of Invention
The application provides a pseudo code synchronization method, a pseudo code synchronization device, electronic equipment and a storage medium, so as to improve pseudo code synchronization precision.
In a first aspect, an embodiment of the present application provides a pseudo code synchronization method, where the pseudo code synchronization method includes:
obtaining a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization;
acquiring pseudo code signals of a phase lag branch, a phase middle branch and a phase lead branch generated by a pseudo code generator;
aiming at the pseudo code signals of each branch, overlapping the pseudo code signals of the branch with the integral square of the product of the spread spectrum signals of different branches to obtain synchronous judgment data of the pseudo code signals of the branch;
and adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches, so that the pseudo code signal of the middle branch of the adjusted phase is synchronous with the spread spectrum signal of the same-phase branch.
In a second aspect, an embodiment of the present application further provides a pseudo code synchronization apparatus, where the pseudo code synchronization apparatus includes:
the spread spectrum signal acquisition module is used for acquiring a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization;
the pseudo code signal acquisition module is used for acquiring pseudo code signals of the phase lag branch, the phase middle branch and the phase lead branch generated by the pseudo code generator;
the synchronous decision data acquisition module is used for superposing the integral squares of the products of the spread spectrum signals of different branches by the pseudo code signals of the branches aiming at the pseudo code signals of the branches to obtain the synchronous decision data of the pseudo code signals of the branches;
and the pseudo code signal adjusting module is used for adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches so as to synchronize the pseudo code signal of the middle branch of the adjusted phase with the spread spectrum signal of the in-phase branch.
In a third aspect, an embodiment of the present application further provides an electronic device, where the electronic device includes:
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 implement any one of the pseudo-code synchronization methods provided by the embodiments of the present application.
In a fourth aspect, the present application further provides a storage medium including computer-executable instructions, which when executed by a computer processor, are configured to perform any one of the pseudo code synchronization methods provided by the embodiments of the present application.
According to the method, the spread spectrum signals of the in-phase branch and the spread spectrum signals of the orthogonal branch are obtained, the pseudo code signals of the phase lag branch, the phase intermediate branch and the phase lead branch generated by the pseudo code generator are obtained, and the pseudo code signals of the branches are superposed on the integral squares of the spread spectrum signal products of different branches aiming at the pseudo code signals of the branches to obtain the synchronous decision data of the pseudo code signals of the branches, so that the synchronous decision data of the pseudo code signals of the branches are obtained. When the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch have phase difference due to asynchronous carrier, the square of the phase difference between the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch is equivalent to multiplying a sine function or a cosine function respectively, the superposition result is 1, the result of synchronous judgment data of the pseudo code signal of each branch cannot be influenced, namely, the phase difference generated by asynchronous carrier can be eliminated, and the accuracy of the synchronous judgment data of the pseudo code signal of each branch is improved. The phase of each branch can be accurately adjusted according to the synchronous judgment data of the pseudo code signal of each branch, so that the pseudo code signal of the middle branch of the adjusted phase is accurately synchronized with the spread spectrum signal of the same-phase branch. Therefore, the technical scheme of the application solves the problem that when phase difference exists in the carrier synchronization process, the phase difference can influence the pseudo code synchronization precision, and achieves the effect of improving the pseudo code synchronization precision.
Drawings
Fig. 1 is a flowchart of a pseudo code synchronization method in a first embodiment of the present application;
fig. 2 is a flowchart of a pseudo code synchronization method in the second embodiment of the present application;
FIG. 3 is a schematic diagram of a pseudo code synchronization method according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a pseudo code synchronization apparatus in a third embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device in a fourth embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first" and "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a pseudo code synchronization method according to an embodiment of the present disclosure, where the embodiment is applicable to a case of performing phase synchronization on a pseudo code signal, and the method may be executed by a pseudo code synchronization apparatus, and the apparatus may be implemented by software and/or hardware.
Referring to the pseudo code synchronization method shown in fig. 1, the method specifically includes the following steps:
s110, obtaining the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch after the input signal is subjected to carrier synchronization.
The input signal is a signal which is sent to a signal receiving party after a signal transmitting party carrier is modulated by a baseband signal and a pseudo code signal together. The carrier synchronization is that the signal receiving party adjusts the carrier phase to synchronize the carrier phase in the input signal with the carrier phase in the in-phase branch, so as to obtain the spread spectrum signal of the in-phase branch and the spread spectrum signal of the quadrature branch after the carrier signal is removed, that is, the spread spectrum signal of the in-phase branch and the spread spectrum signal of the quadrature branch do not contain the carrier signal. The spread spectrum signal is a signal obtained by adopting a CDMA technology, selecting a specific binary pseudorandom sequence as a pseudo code and performing spread spectrum modulation on a baseband signal by adopting a direct sequence spread spectrum technology. The spread spectrum signal of the in-phase branch is the in-phase branch signal output after the input signal carrier is synchronized, and the spread spectrum signal of the orthogonal branch is the orthogonal branch signal output after the input signal carrier is synchronized.
And S120, acquiring the pseudo code signals of the phase lag branch, the phase middle branch and the phase lead branch generated by the pseudo code generator.
The pseudo code generator is used for generating a pseudo code for the signal receiving party, the signal receiving party stores a pseudo code signal, the pseudo code signal is a periodic signal, and when the pseudo code generated by the pseudo code generator is the same as the pseudo code phase of the spread spectrum signal, the spread spectrum signal can be despread to obtain a baseband signal. Three paths of signals are obtained by delaying the pseudo code signals generated by the pseudo code generator, and are respectively a phase lag branch, a phase middle branch and a phase lead branch, and are used for generating pseudo code synchronization judgment data. Specifically, the phase middle branch circuit is a pseudo code signal generated by a pseudo code generator; the phase lag branch is a branch signal obtained by adjusting TC/2 of a pseudo code signal generated by a pseudo code generator along a lag direction; the phase advance branch circuit is a branch circuit signal obtained by adjusting TC/2 of a pseudo code signal generated by a pseudo code generator along the advance direction. Where TC is one symbol period.
S130, aiming at the pseudo code signals of each branch, overlapping the pseudo code signals of the branch with the integral square of the product of the spread spectrum signals of different branches to obtain the synchronous judgment data of the pseudo code signals of the branch.
The pseudo code signals of each branch are also phase lag branch, phase middle branch and phase lead branch. And multiplying one branch pseudo code signal in each branch with the spread spectrum signals of different branches respectively, calculating the integral of the branch pseudo code signal in a pseudo code period, and adding the squares of the two integral values to obtain the synchronous judgment data of the branch pseudo code signal. Illustratively, the phase-lag branch is multiplied by the spread spectrum signal of the in-phase branch and the spread spectrum signal of the quadrature branch respectively, the two multiplied signals are integrated in a pseudo code period respectively to obtain two integral values, the two integral values are subjected to square calculation to obtain two square data, and the two square data are superposed to obtain the synchronous decision data of the phase-lag branch. It should be noted that, because the values in the pseudo code signal are only +1 and-1, the phase lag branch is multiplied by the spread spectrum signal of the in-phase branch and the spread spectrum signal of the quadrature branch, and actually, the sign of the value of the pseudo code signal is judged to add the spread spectrum signal of the in-phase branch and the spread spectrum signal of the quadrature branch to realize the multiplication process, so that the calculation efficiency can be improved, and the calculation resources can be saved. The synchronization decision data of the phase middle branch and the phase leading branch are obtained in the same way as the synchronization decision data of the phase lagging branch, and are not described in detail here.
S140, adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches, so that the pseudo code signal of the middle branch of the adjusted phase is synchronous with the spread spectrum signal of the same-phase branch.
The synchronous decision data of the pseudo code signals of different branches are used for providing a decision basis for adjusting the phase of the pseudo code signals. The phase adjustment of the pseudo code signals is realized by adjusting the pseudo code address of the pseudo code generator, and when the pseudo code address changes, the phase of each branch pseudo code signal is correspondingly adjusted. The pseudo code synchronization refers to the phase synchronization of the pseudo code signal of the phase middle branch and the spread spectrum signal of the same-phase branch. Illustratively, the adjusting process of the pseudo code synchronization can be divided into a pseudo code capturing phase and a pseudo code tracking phase. In the pseudo code capturing stage, the phase of a pseudo code signal generated by a pseudo code generator can be adjusted through the synchronization judgment data of the phase middle branch, illustratively, the address of the pseudo code signal is adjusted to slide by one code element length each time, and whether the pseudo code tracking stage is started or not is determined through the synchronization judgment data of the phase middle branch; in the pseudo code tracking stage, the phase of the pseudo code signal generated by the pseudo code generator is adjusted through the synchronization decision data of the phase lag branch and the synchronization decision data of the phase lead branch, illustratively, the address of the pseudo code signal is adjusted by half a code element length each time, and whether the pseudo code signal of the phase middle branch is adjusted is synchronous with the spread spectrum signal of the in-phase branch is determined by comparing the synchronization decision data of the phase lag branch and the synchronization decision data of the phase lead branch.
According to the technical scheme of the embodiment, the synchronous determination data of the branch pseudo code signal is obtained by acquiring the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch, acquiring the pseudo code signals of the phase lag branch, the phase intermediate branch and the phase lead branch generated by the pseudo code generator, and superposing the integral squares of the products of the spread spectrum signals of different branches by the pseudo code signal of the branch aiming at the pseudo code signal of each branch, so that the synchronous determination data of the pseudo code signal of each branch is obtained. When the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch have phase difference due to asynchronous carrier, the square of the phase difference between the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch is equivalent to multiplying a sine function or a cosine function respectively, the superposition result is 1, the result of synchronous judgment data of the pseudo code signal of each branch cannot be influenced, namely, the phase difference generated by asynchronous carrier can be eliminated, and the accuracy of the synchronous judgment data of the pseudo code signal of each branch is improved. The phase of each branch can be accurately adjusted according to the synchronous judgment data of the pseudo code signal of each branch, so that the pseudo code signal of the middle branch of the adjusted phase is accurately synchronized with the spread spectrum signal of the same-phase branch. Therefore, by the technical scheme, the problem that when phase difference exists in the carrier synchronization process, the phase difference can influence the pseudo code synchronization precision is solved, and the effect of improving the pseudo code synchronization precision is achieved.
Example two
Fig. 2 is a flowchart of a flowchart method of a pseudo code synchronization method provided in the second embodiment of the present application, and the technical solution of this embodiment is further refined on the basis of the above technical solution.
Further, the integration squares of the pseudo code signals of the branch circuit to the products of the spread spectrum signals of different branch circuits are superposed to obtain the synchronous decision data of the pseudo code signals of the branch circuit, and the method is refined as follows: in the pseudo code capturing stage, the pseudo code signal of the phase middle branch is superposed with the integral square of the product of the spread spectrum signals of different branches to obtain middle synchronous judgment data corresponding to the phase middle branch; in the pseudo code tracking stage, the pseudo code signals of the phase leading branch are superposed with the integral squares of the spread spectrum signal products of different branches to obtain leading synchronous decision data corresponding to the phase leading branch, and the pseudo code signals of the phase lagging branch are superposed with the integral squares of the spread spectrum signal products of different branches to obtain lagging synchronous decision data corresponding to the phase lagging branch, so as to perfect the synchronous decision data determination mechanisms of different stages.
Further, the method comprises the steps of regulating the phase of each branch pseudo code signal according to synchronous judgment data of different branch pseudo code signals, and refining the phase into a pseudo code capturing phase, and determining whether to enter a pseudo code tracking phase from the pseudo code capturing phase according to intermediate synchronous judgment data and a preset tracking threshold; if the pseudo code acquisition stage is in, moving the pseudo code signals of different branches to a preset direction by one code length; and if the pseudo code tracking stage is in, adjusting the phase of each branch pseudo code signal according to the difference value of the advance synchronous judgment data and the lag synchronous judgment data so as to perfect the adjustment mechanism of the pseudo code signal.
Referring to fig. 2, a pseudo code synchronization method includes:
s210, obtaining the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch after the input signal is subjected to carrier synchronization.
And S220, acquiring the pseudo code signals of the phase lag branch, the phase middle branch and the phase lead branch generated by the pseudo code generator.
And S230, in a pseudo code capturing stage, overlapping the pseudo code signal of the phase middle branch with the integral square of the product of the spread spectrum signals of different branches to obtain middle synchronization judgment data corresponding to the phase middle branch.
In the pseudo code capturing phase, the pseudo code signal generated by the pseudo code generator has a large phase difference with the spread spectrum signal of the branch and the spread spectrum signal of the orthogonal branch, and the phase difference is at least one code element. And respectively multiplying the pseudo code signal of the phase middle branch with the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch, integrating the multiplied signals in a pseudo code period to obtain two integral values, and then superposing the two integral values to obtain middle synchronization judgment data corresponding to the phase middle branch. The intermediate synchronization decision data is used to determine whether the adjustment of the pseudo code synchronization is in the pseudo code capture phase.
Intermediate synchronous decision data corresponding to the phase intermediate branch is obtained in the pseudo code capturing stage, and synchronous decision data are provided for pseudo code synchronous adjustment in the pseudo code capturing stage.
S231, in the pseudo code capturing stage, determining whether to enter the pseudo code tracking stage from the pseudo code capturing stage according to the intermediate synchronous judgment data and a preset tracking threshold; if not, executing S232; otherwise, S240 is performed.
The preset tracking threshold is a preset threshold, is used for judging whether to enter the pseudo code tracking stage from the pseudo code capturing stage, and can be set or adjusted by technicians according to needs or experience. Specifically, when the intermediate synchronization determination data is greater than the preset tracking threshold, the pseudo code capturing stage enters the pseudo code tracking stage, that is, S240 is executed; when the middle synchronization determination data is less than or equal to the preset tracking threshold, the pseudo code capturing stage is still in the middle, and the pseudo code capturing stage cannot enter the pseudo code tracking stage, that is, S232 is executed.
S232, moving the pseudo code signals of different branches to a preset direction by one code length; execution returns to S230.
And if the pseudo code is in a pseudo code capturing stage, namely when the intermediate synchronous judgment data is less than or equal to the preset tracking threshold value, adjusting the pseudo code address of the pseudo code generator to slide by a code length towards the preset direction, namely moving the pseudo code signals of different branches by a code length towards the preset direction. After S232 is executed, the process returns to S230.
The preset direction is a preset direction, and may be, for example, any one of a lag direction and a lead direction, and the present application is not limited specifically. In the pseudo code capturing stage, because the phase difference between the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch and the pseudo code signal of the phase middle branch generated by the pseudo code generator is larger, the phase adjusting direction is not judged, and the phase of the pseudo code signal is directly adjusted according to the preset direction, so that the calculation times can be reduced, and the adjusting efficiency is improved.
Whether the pseudo code tracking stage enters the pseudo code capturing stage or not is determined through the intermediate synchronous judgment data and the preset tracking threshold value in the pseudo code capturing stage, different adjusting stages can be distinguished to facilitate the subsequent adoption of different adjusting modes, pseudo code signals of different branches are moved by one code length in the preset direction in the pseudo code capturing stage, one code length is adjusted according to the preset direction, the adjusting direction does not need to be judged, the adjusting time can be shortened, computing resources are saved, and the pseudo code synchronous adjusting efficiency is improved.
In an optional embodiment, the sum of squares of amplitudes of the spread spectrum signals of different branches at least one sampling point is superimposed to obtain the preset tracking threshold.
And superposing the amplitude square sum of the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch at least one sampling point to obtain a preset tracking threshold value. The number of sampling points is a preset value, and can be set or adjusted by a technician according to needs or experience, for example, 2000.
The sum of squares of the amplitudes is superposed, namely the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch are respectively multiplied by a sine function or a cosine function, the sum of squares of the sine function and the cosine function is equal to 1, under the condition that an error exists in carrier synchronization, the influence of phase difference of the carrier synchronization can be effectively eliminated, and the accuracy of pseudo code synchronization is improved.
S240, in the pseudo code tracking stage, the pseudo code signals of the phase leading branch are superposed with the integral squares of the products of the spread spectrum signals of different branches to obtain leading synchronous decision data corresponding to the phase leading branch, and the pseudo code signals of the phase lagging branch are superposed with the integral squares of the products of the spread spectrum signals of different branches to obtain lagging synchronous decision data corresponding to the phase lagging branch. Execution continues with S241.
In the pseudo code tracking stage, the pseudo code signal generated by the pseudo code generator has a small phase difference with the spread spectrum signal of the branch circuit and the spread spectrum signal of the orthogonal branch circuit, and the phase difference is smaller than one code element exemplarily. And respectively multiplying the pseudo code signal of the phase advance branch with the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch, integrating the multiplied signals in a pseudo code period, and superposing the two integration values after squaring to obtain the advance synchronous decision data corresponding to the phase advance branch. And respectively multiplying the pseudo code signal of the phase lag branch, the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch, integrating the multiplied signals in a pseudo code period to obtain the sum of squares of two integral values, and then superposing the two integral values to obtain lag synchronization judgment data corresponding to the phase lag branch. The advance synchronization decision data and the retard synchronization decision data are used as a judgment for adjusting the phase of the pseudo code signal in the pseudo code tracking stage and, for example, may be used for judging the phase adjustment direction of the pseudo code signal.
Because the pseudo code capturing stage and the pseudo code tracking stage are not crossed in time, and the acquisition methods of the advance synchronous judgment data and the lag synchronous judgment data are the same as the calculation method of the intermediate judgment data, when the advance synchronous judgment data or the lag synchronous judgment data are obtained, the phase advance branch or the phase lag branch and the phase intermediate branch can multiplex hardware resources such as an integrator and an accumulator, and the cost of the hardware resources is reduced.
In the pseudo code tracking stage, the advance synchronization decision data corresponding to the phase advance branch and the lag synchronization decision data corresponding to the phase lag branch are obtained, and the synchronization decision data can be provided for pseudo code synchronization adjustment in the pseudo code tracking stage.
And S241, adjusting the phase of the pseudo code signal of each branch according to the difference value of the advance synchronization judgment data and the lag synchronization judgment data.
If the pseudo code tracking stage is in, namely when the intermediate synchronization judgment data is larger than the preset tracking threshold value, the difference value of the leading synchronization judgment data and the lagging synchronization judgment data is calculated, namely the data obtained by subtracting the lagging synchronization judgment data from the leading synchronization judgment data is obtained. The difference value of the advance synchronous decision data and the lag synchronous decision data represents the phase relation between the pseudo code signal of the middle phase branch and the spread spectrum signal of the in-phase branch generated by the pseudo code generator, so that the phase adjustment direction can be determined through the difference value, and the pseudo code address of the pseudo code signal is adjusted along the phase adjustment direction by half the code length, namely, the phase of the pseudo code signal of each branch is adjusted.
When the pseudo code tracking stage is in, the phase of each branch pseudo code signal is adjusted according to the difference value of the leading synchronous judgment data and the lagging synchronous judgment data, so that the accurate adjustment of the pseudo code phase can be realized, and the pseudo code synchronization can be quickly realized.
In an alternative embodiment, adjusting the phase of each branch pseudo code signal based on the difference between the early synchronization decision data and the late synchronization decision data comprises: if the difference value is larger than a preset difference value threshold value, the pseudo code signals of different branches are moved by half code length towards the lagging direction; if the difference value is smaller than a preset difference value threshold value, the pseudo code signals of different branches are moved by half code length towards the advance direction; and if the difference value is equal to the preset difference value threshold value, forbidding to adjust the phases of the pseudo code signals of different branches.
The preset difference threshold is used to indicate the phase relationship between the leading synchronization decision data and the lagging synchronization decision data, and may be set to 0, for example. If the difference value is greater than the preset difference value threshold value, the phase of a pseudo code signal of a middle phase branch generated by a pseudo code generator is represented, the phase of a spread spectrum signal of an in-phase branch is advanced, the pseudo code address of the pseudo code signal is adjusted to move by half code length towards the lagging direction, namely the pseudo code signals of different branches move by half code length towards the lagging direction; if the difference value is smaller than the preset difference value threshold value, the phase of a pseudo code signal of a middle phase branch generated by a pseudo code generator is shown to lag behind the phase of a spread spectrum signal of an in-phase branch, and the pseudo code address of the pseudo code signal is adjusted to move by half code length towards the advance direction, namely the pseudo code signals of different branches are moved by half code length towards the advance direction; if the difference value is equal to the preset difference value threshold value, the phase of the pseudo code signal of the middle phase branch generated by the pseudo code generator is synchronous with the phase of the spread spectrum signal of the in-phase branch, at the moment, the pseudo code synchronization can be determined to be achieved, and the phase of the pseudo code signal of different branches is forbidden to be adjusted.
The moving direction of the pseudo code signal is determined according to the difference value of the advanced synchronous judgment data and the delayed synchronous judgment data, so that the pseudo code signal can be accurately adjusted, the pseudo code adjusting efficiency is improved, when the difference value is equal to a preset difference value threshold value and reaches a pseudo code synchronous state, the adjustment of the phase positions of the pseudo code signals of different branches is forbidden, the false adjustment is prevented, and the accuracy of the pseudo code adjustment is ensured.
In an optional embodiment, the pseudo code synchronization method further comprises: taking a pseudo code signal of a last phase intermediate branch in a pseudo code capturing stage or a pseudo code signal of any phase intermediate branch in a pseudo code tracking stage as a target pseudo code signal; determining a symbol identifier according to an integral result of a product of a target pseudo code signal and a spread spectrum signal of an in-phase branch; despreading the spread spectrum signal of the in-phase branch according to the pseudo code signal of the synchronized phase middle branch to obtain a basic despread signal; and obtaining a target de-spread signal according to the symbol identifier and the basic de-spread signal.
The target pseudo code signal is used for determining the symbol identifier, and the target pseudo code signal can be a pseudo code signal of a phase middle branch at the last time of a pseudo code capturing stage or a pseudo code signal of any phase middle branch of a pseudo code tracking stage. The pseudo code signal of the middle branch of the last phase in the pseudo code capturing stage is the pseudo code signal of the middle branch when entering the pseudo code tracking stage in the pseudo code capturing stage according to the middle synchronous judgment data and the preset tracking threshold value. Preferably, the pseudo code signal of the last phase middle branch of the pseudo code capturing phase is selected as the target pseudo code signal. The phase of the pseudo code signal of the last phase middle branch in the pseudo code capturing stage and the phase of the pseudo code signal in the spread spectrum signal of the in-phase branch are within one code element length, and the sign of the integral result of the product of the spread spectrum signals of the phase middle branch and the in-phase branch is the same as the sign of the integral result of the product of the pseudo code signal of any phase middle branch in the pseudo code tracking stage and the spread spectrum signal of the in-phase branch, so that the integral of the product of the spread spectrum signals of the phase middle branch and the in-phase branch does not need to be calculated again, the multiplexing of data can be realized, and the calculation resources are saved.
The symbol flag is flag data of a symbol bit of the despread signal, and is used to indicate a phase relationship between the pseudo code signal of the phase intermediate branch and the spread spectrum signal of the in-phase branch. Illustratively, the phase relationship includes a phase consistency relationship and a phase reversal relationship, and correspondingly, the symbol identifier includes 0 and 1. Specifically, an integral result of a product of the target pseudo code signal and the spread spectrum signal of the in-phase branch is calculated, if the integral result is a positive value, the phase is opposite, and the sign is 0; otherwise, the phases are consistent and the symbol is 1. And multiplying the pseudo code signal of the middle branch of the synchronized phase by the spread spectrum signal of the in-phase branch to realize despreading the spread spectrum signal of the in-phase branch and obtain a basic despread signal. At this time, the pseudo code signal is not included in the base despread signal, but the base despread signal has both the phase consistency and the phase reversal relationship with the baseband signal in the input signal. Thus, a target despread signal is obtained from the symbol identity and the base despread signal. The target de-spread signal is a baseband signal in the input signal, namely a pseudo code synchronized signal.
The pseudo code signal of the last phase intermediate branch in the pseudo code capturing stage or the pseudo code signal of any phase intermediate branch in the pseudo code tracking stage is used as a target pseudo code signal; the symbol identification is determined according to the pseudo code signal, and the symbol of the basic de-spread signal can be accurately determined; and obtaining a target despread signal according to the symbol identifier and the basic despread signal, so that an accurate target despread signal can be obtained.
Fig. 3 is a schematic diagram of a pseudo code synchronization method provided in this embodiment. Wherein 31 denotes a phase lag branch; 32 denotes a phase intermediate branch; 33 denotes a phase lead branch; i represents the spread spectrum signal of the in-phase branch; q denotes a spread signal of the orthogonal branch. The square sum in the figure corresponds from top to bottom to the late synchronization decision data, the intermediate synchronization decision data, and the early synchronization decision data, respectively. And the symbol decision is to judge the symbol of the basic de-spread signal according to the symbol identifier to obtain a target de-spread signal.
In the technical scheme of the embodiment, in a pseudo code capturing stage, intermediate synchronization judgment data corresponding to a phase intermediate branch is determined, whether a pseudo code capturing stage enters a pseudo code tracking stage or not is determined according to the intermediate synchronization judgment data and a preset tracking threshold, and different pseudo code synchronization stages are distinguished; in the pseudo code capturing stage, the pseudo code signals of different branches are moved by one code length in the preset direction, so that the phase of the pseudo code signals is quickly adjusted in the pseudo code capturing stage; in the pseudo code tracking stage, determining the advance synchronous decision data corresponding to the phase advance branch and the lag synchronous decision data corresponding to the phase lag branch, and adjusting the phase of the pseudo code signal of each branch according to the difference value of the advance synchronous decision data and the lag synchronous decision data, thereby realizing the accurate adjustment of the phase of the pseudo code signal in the pseudo code tracking stage. And the phase of the pseudo code signal is adjusted in different modes at different stages, so that the pseudo code synchronization precision is improved.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a pseudo code synchronization apparatus provided in the third embodiment of the present application, which is applicable to the case of adjusting the phase of a pseudo code signal, and the specific structure of the pseudo code synchronization apparatus is as follows:
a spread spectrum signal obtaining module 410, configured to obtain a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after carrier synchronization of an input signal;
a pseudo code signal obtaining module 420, configured to obtain pseudo code signals of the phase lag branch, the phase middle branch and the phase lead branch generated by the pseudo code generator;
a synchronous decision data obtaining module 430, configured to superimpose, for the pseudo code signal of each branch, an integral square of a product of the pseudo code signal of the branch with a spread spectrum signal of a different branch, so as to obtain synchronous decision data of the pseudo code signal of the branch;
the pseudo code signal adjusting module 440 is configured to adjust the phase of each branch pseudo code signal according to the synchronization determination data of the different branch pseudo code signals, so that the adjusted pseudo code signal of the phase middle branch is synchronized with the spread spectrum signal of the in-phase branch.
According to the technical scheme of the embodiment, the synchronous determination data of the branch pseudo code signal is obtained by acquiring the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch, acquiring the pseudo code signals of the phase lag branch, the phase intermediate branch and the phase lead branch generated by the pseudo code generator, and superposing the integral squares of the products of the spread spectrum signals of different branches by the pseudo code signal of the branch aiming at the pseudo code signal of each branch, so that the synchronous determination data of the pseudo code signal of each branch is obtained. When the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch have phase difference due to asynchronous carrier, the square of the phase difference between the spread spectrum signal of the in-phase branch and the spread spectrum signal of the orthogonal branch is equivalent to multiplying a sine function or a cosine function respectively, the superposition result is 1, the result of synchronous judgment data of the pseudo code signal of each branch cannot be influenced, namely, the phase difference generated by asynchronous carrier can be eliminated, and the accuracy of the synchronous judgment data of the pseudo code signal of each branch is improved. The phase of each branch can be accurately adjusted according to the synchronous judgment data of the pseudo code signal of each branch, so that the pseudo code signal of the middle branch of the adjusted phase is accurately synchronized with the spread spectrum signal of the same-phase branch. Therefore, by the technical scheme, the problem that when phase difference exists in the carrier synchronization process, the phase difference can influence the pseudo code synchronization precision is solved, and the effect of improving the pseudo code synchronization precision is achieved.
Optionally, the synchronization determination data obtaining module 430 includes:
a captured synchronization judgment data acquisition unit, configured to superimpose, in a pseudo code capture stage, a pseudo code signal of a phase middle branch on an integral square of a product of spread spectrum signals of different branches to obtain middle synchronization judgment data corresponding to the phase middle branch;
and the tracking synchronization judgment data acquisition unit is used for superposing the pseudo code signal of the phase leading branch on the integral square of the spread spectrum signal product of different branches to obtain leading synchronization judgment data corresponding to the phase leading branch in the pseudo code tracking stage, and superposing the pseudo code signal of the phase lagging branch on the integral square of the spread spectrum signal product of different branches to obtain lagging synchronization judgment data corresponding to the phase lagging branch.
Optionally, the pseudo code signal adjusting module 440 includes:
the synchronous stage determining unit is used for determining whether to enter a pseudo code tracking stage from the pseudo code capturing stage or not according to the intermediate synchronous judgment data and a preset tracking threshold value in the pseudo code capturing stage;
and the acquisition stage adjusting unit is used for moving the pseudo code signals of different branches to a preset direction by one code length if the pseudo code acquisition stage is in the pseudo code acquisition stage.
Optionally, the pseudo code signal adjusting module 440 includes:
a tracking stage adjusting unit for adjusting the phase of each branch pseudo code signal according to the difference between the early synchronous decision data and the late synchronous decision data if the pseudo code tracking stage is in
Optionally, the tracking phase adjusting unit includes:
the delay direction moving subunit is used for moving the pseudo code signals of different branches by half code length in the delay direction if the difference value is greater than a preset difference value threshold;
the advancing direction moving subunit is used for moving the pseudo code signals of different branches by half code length towards the advancing direction if the difference value is smaller than a preset difference value threshold;
and the adjusting forbidding subunit is used for forbidding to adjust the phases of the pseudo code signals of different branches if the difference value is equal to the preset difference value threshold.
Optionally, the pseudo code synchronization apparatus includes:
and the preset tracking threshold acquisition module is used for superposing the sum of squares of the amplitudes of the spread spectrum signals of different branches at least one sampling point to obtain a preset tracking threshold.
Optionally, the pseudo code synchronization apparatus further includes:
the target pseudo code signal acquisition module is used for taking a pseudo code signal of a last phase middle branch in a pseudo code capturing stage or a pseudo code signal of any phase middle branch in a pseudo code tracking stage as a target pseudo code signal;
the symbol mark determining module is used for determining a symbol mark according to an integral result of the product of the target pseudo code signal and the spread spectrum signal of the in-phase branch;
the basic de-spread signal acquisition module is used for de-spreading the spread spectrum signal of the in-phase branch according to the pseudo code signal of the synchronized phase middle branch to obtain a basic de-spread signal;
and the target de-spread signal acquisition module is used for acquiring a target de-spread signal according to the symbol identifier and the basic de-spread signal.
The pseudo code synchronization device provided by the embodiment of the application can execute the pseudo code synchronization method provided by any embodiment of the application, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 5 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present disclosure, as shown in fig. 5, the electronic device includes a processor 510, a memory 520, an input device 530, and an output device 540; the number of the processors 510 in the electronic 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 electronic 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 the pseudo code synchronization method in the embodiments of the present application (for example, the spread spectrum signal obtaining module 410, the pseudo code signal obtaining module 420, the synchronization decision data obtaining module 430, and the pseudo code signal adjusting module 440). The processor 510 executes various functional applications and data processing of the electronic device by executing software programs, instructions and modules stored in the memory 520, that is, the pseudo code synchronization method described above is implemented.
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, 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 an electronic 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 character information and generate key signal inputs related to user settings and function control of the electronic apparatus. The output device 540 may include a display device such as a display screen.
EXAMPLE five
A fifth embodiment of the present application further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a pseudo code synchronization method, including:
obtaining a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization; acquiring pseudo code signals of a phase lag branch, a phase middle branch and a phase lead branch generated by a pseudo code generator; aiming at the pseudo code signals of each branch, overlapping the pseudo code signals of the branch with the integral square of the product of the spread spectrum signals of different branches to obtain synchronous judgment data of the pseudo code signals of the branch; and adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches, so that the pseudo code signal of the middle branch of the adjusted phase is synchronous with the spread spectrum signal of the same-phase branch.
Of course, the storage medium provided in the embodiments of the present application contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also perform related operations in the pseudo code synchronization method provided in any embodiments of the present application.
From the above description of the embodiments, it is obvious for those skilled in the art that the present application can be implemented by software and necessary general hardware, and certainly can be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present application or portions thereof contributing to the prior art may be embodied in the form of a software product, which may 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 an electronic device (which may be a personal computer, a server, or a network device) to execute the methods described in the embodiments of the present application.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely 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 used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application 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 application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. A pseudo code synchronization method, comprising:
obtaining a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization;
acquiring pseudo code signals of a phase lag branch, a phase middle branch and a phase lead branch generated by a pseudo code generator;
aiming at the pseudo code signals of each branch, overlapping the pseudo code signals of the branch with the integral square of the product of the spread spectrum signals of different branches to obtain synchronous judgment data of the pseudo code signals of the branch;
and adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches, so that the pseudo code signal of the middle branch of the adjusted phase is synchronous with the spread spectrum signal of the same-phase branch.
2. The method of claim 1, wherein the step of adding the quadrature sum of products of the spread spectrum signals of different branches to the pseudo code signal of the branch to obtain the synchronization decision data of the pseudo code signal of the branch comprises:
in the pseudo code capturing stage, the pseudo code signal of the phase middle branch is superposed with the integral square of the product of the spread spectrum signals of different branches to obtain middle synchronous judgment data corresponding to the phase middle branch;
in the pseudo code tracking stage, the pseudo code signals of the phase leading branch are superposed with the integral squares of the spread spectrum signal products of different branches to obtain leading synchronous decision data corresponding to the phase leading branch, and the pseudo code signals of the phase lagging branch are superposed with the integral squares of the spread spectrum signal products of different branches to obtain lagging synchronous decision data corresponding to the phase lagging branch.
3. The method according to claim 2, wherein the adjusting the phase of the pseudo-code signal of each branch according to the synchronization decision data of the pseudo-code signals of different branches comprises:
in the pseudo code capturing stage, whether the pseudo code capturing stage enters the pseudo code tracking stage or not is determined according to the intermediate synchronous judgment data and a preset tracking threshold value;
and if the pseudo code acquisition stage is in the pseudo code acquisition stage, moving the pseudo code signals of different branches by one code length in a preset direction.
4. The method according to claim 2 or 3, wherein the adjusting the phase of each branch pseudo code signal according to the synchronous decision data of different branch pseudo code signals comprises:
and if the phase is in a pseudo code tracking stage, adjusting the phase of each branch pseudo code signal according to the difference value of the advanced synchronous judgment data and the delayed synchronous judgment data.
5. The method of claim 4, wherein adjusting the phase of each branch pseudo code signal based on the difference between the early synchronization decision data and the late synchronization decision data comprises:
if the difference value is larger than a preset difference value threshold value, the pseudo code signals of different branches are moved by half code length towards the lagging direction;
if the difference value is smaller than a preset difference value threshold value, the pseudo code signals of different branches are moved by half code length towards the advance direction;
and if the difference value is equal to the preset difference value threshold value, forbidding to adjust the phases of the pseudo code signals of different branches.
6. The method of claim 3, further comprising:
and superposing the sum of squares of the amplitude values of the spread spectrum signals of different branches at least one sampling point to obtain the preset tracking threshold value.
7. The method of claim 2, further comprising:
taking a pseudo code signal of a last phase intermediate branch in a pseudo code capturing stage or a pseudo code signal of any phase intermediate branch in a pseudo code tracking stage as a target pseudo code signal;
determining a symbol identifier according to an integral result of a product of a target pseudo code signal and a spread spectrum signal of an in-phase branch;
despreading the spread spectrum signal of the in-phase branch according to the pseudo code signal of the synchronized phase middle branch to obtain a basic despread signal;
and obtaining a target despreading signal according to the symbol identifier and the basic despreading signal.
8. A pseudo code synchronization apparatus, comprising:
the spread spectrum signal acquisition module is used for acquiring a spread spectrum signal of an in-phase branch and a spread spectrum signal of an orthogonal branch after an input signal is subjected to carrier synchronization;
the pseudo code signal acquisition module is used for acquiring pseudo code signals of the phase lag branch, the phase middle branch and the phase lead branch generated by the pseudo code generator;
the synchronous decision data acquisition module is used for superposing the integral square sum of the products of the pseudo code signals of the branch circuits on the spread spectrum signals of different branch circuits aiming at the pseudo code signals of each branch circuit to obtain synchronous decision data of the pseudo code signals of the branch circuits;
and the pseudo code signal adjusting module is used for adjusting the phase of each branch pseudo code signal according to the synchronous judgment data of the pseudo code signals of different branches so as to synchronize the pseudo code signal of the middle branch of the adjusted phase with the spread spectrum signal of the in-phase branch.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the pseudo-code synchronization method as claimed in any one of claims 1 to 7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a pseudo-code synchronization method according to any one of claims 1 to 7.
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