CN110401607B - Method and device for detecting unique code - Google Patents
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Abstract
The invention discloses a method and a device for detecting a unique code. Wherein, the method comprises the following steps: acquiring an error between a first signal parameter of each unique code and a second signal parameter of each unique code, wherein the first signal parameter is a signal parameter of the unique code in a signal of a sending end, the second signal parameter is a signal parameter of the unique code in a signal of a receiving end, and the signal parameter is obtained according to an angle difference value of a unique code symbol with a distance of n; and determining the type of each unique code in the signal of the receiving end according to the error between the first signal parameter and the second signal parameter. The invention solves the technical problem of poor performance of the unique code detection in satellite communication in the scenes of low signal-to-noise ratio and large frequency offset in the related technology.
Description
Technical Field
The invention relates to the field of signal processing, in particular to a method and a device for detecting a unique code.
Background
Fig. 1 is a schematic diagram of a prior art wireless communication system. The transmitting end of the communication system transmits the signal after baseband modulation and forming filtering. Due to the influence of the additive white gaussian noise in the channel, the doppler effect and different sources of local oscillation of the transceiver, the signal at the receiving end has time delay, frequency offset and phase difference, so that the receiving end needs to perform channel estimation after matched filtering.
The channel estimation algorithm is classified into a Data Aided (DA) algorithm and a Non-Data Aided (NDA) algorithm according to the presence or absence of Data assistance. The UW signal detection method is a data-aided algorithm, which uses a unique code (UniqueWord, UW) to add a training sequence into a burst signal, and a receiver estimates the change of information transmitted after passing through a channel by using the change generated after the unique code passes through the channel. The same burst may have different types of UWs for carrying different logical channels. The ambiguity of the UW type affects the channel estimation so that the signal cannot be correctly demodulated, affecting the communication.
The existing UW signal detection method usually solves a correlation peak according to the corresponding positions of a local UW sequence and a received signal sequence, and completes the detection of the UW sequence according to the position of the correlation peak. However, in the scene of sudden occurrence of noise and large frequency offset, the method has large estimation error, and the signal cannot be demodulated normally, so that the communication requirement cannot be met.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting a unique code, which are used for at least solving the technical problem of poor performance of the unique code detection in satellite communication under the scenes of low signal-to-noise ratio and large frequency offset in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a method for detecting a unique code, including: acquiring an error between a first signal parameter of each unique code and a second signal parameter of each unique code, wherein the first signal parameter is the signal parameter of the unique code in the signal of the sending end, the second signal parameter is the signal parameter of the unique code in the signal of the receiving end, and the signal parameters are obtained according to the angle difference value of the unique code symbol with the distance of n; and determining the type of each unique code in the signal of the receiving end according to the error between the first signal parameter and the second signal parameter.
Further, the signal parameters include multiple sets of dual angle difference values, the dual angle difference values are used for representing second dual angle difference values obtained on the basis of the first dual angle difference values, the first dual angle difference values are used for representing differences between unique code symbols with a distance n, the second dual angle difference values are used for representing differences between adjacent first dual angle difference values, and the distance parameters n of each set of dual angle difference values are different; acquiring an error between the first signal parameter of each unique code and the second signal parameter of each unique code, comprising: acquiring a first duplicate angle difference value of each unique code in a signal of a sending end; acquiring a second dual angle difference value of each unique code in the signal of the receiving end; and determining an error according to the first dual angle difference and the second dual angle difference.
Further, obtaining a distance parameter n; acquiring a normalized difference value of two unique code symbols with the distance of n in a receiving end signal, wherein the normalized difference value is obtained by normalizing the difference value of the two unique code symbols with the distance of n; and carrying out conjugate multiplication on the normalized difference values of the two unique code symbols to obtain a first dual angle difference value between the two unique code symbols with the distance n.
Further, acquiring a received receiving end signal; changing additive noise in a receiving end signal into multiplicative noise to obtain a changed receiving end signal; acquiring a difference value of two unique code symbols with a distance of n in the changed receiving end signal; and normalizing the difference value of the two unique code symbols with the distance n to obtain a normalized difference value.
Further, obtaining a distance parameter n; carrying out conjugate multiplication on two unique code symbols with the distance of n in a signal at a sending end to obtain a first heavy angle difference value of the two unique code symbols with the distance of n; carrying out conjugate multiplication on adjacent first heavy angle difference values to obtain a double angle difference value corresponding to the distance parameter n; and determining a set of the dual angle difference values corresponding to the plurality of distance parameters n as a first dual angle difference value of each unique code in the signal of the transmitting end.
Further, acquiring a preset sliding window; acquiring errors corresponding to each group of dual angle difference values according to the sliding window; and determining the sum of the errors corresponding to each group of dual angle difference values as an error.
Further, the type of each unique code in the signal of the sending end is obtained; searching a second signal parameter with the minimum error with a target first signal parameter from errors between the first signal parameter and the second signal parameter, wherein the target first signal parameter is any one unique code in a signal of a transmitting end; and determining the type of the unique code corresponding to the searched second signal parameter, wherein the type of the unique code corresponding to the searched second signal parameter is the same as that of the unique code corresponding to the target first signal parameter.
According to another aspect of the embodiments of the present invention, there is also provided a unique code detection apparatus including: the acquisition module is used for acquiring an error between a first signal parameter of each unique code and a second signal parameter of each unique code, wherein the first signal parameter is a signal parameter of the unique code in the signal of the sending end, the second signal parameter is a signal parameter of the unique code in the signal of the receiving end, and the signal parameter is obtained according to an angle difference value of the unique code symbol with the distance of n; and the determining module is used for determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium including a stored program, wherein the storage medium is controlled to execute the above-mentioned unique code detection method when the program is executed.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes the method for detecting the unique code.
In the embodiment of the invention, the error between the first signal parameter of each unique code and the second signal parameter of each unique code is obtained, wherein the first signal parameter is the signal parameter of the unique code in the signal of the sending end, and the second signal parameter is the signal parameter of the unique code in the signal of the receiving end; and determining the type of each unique code in the signal of the receiving end according to the error between the first signal parameter and the second signal parameter. The above scheme determines the type of the unique code signal in the receiving end signal through the error between the signal parameter of the unique code in the transmitting end signal and the signal parameter of the unique code in the receiving end signal, and the signal parameter is obtained according to the angle difference value of the unique code symbol with the distance of n, so that the influence of noise on the unique code symbol is weakened through the angle difference value mode, the unique code signal can adapt to large frequency deviation, phase shift and noise, and the technical problem of poor performance of the unique code detection in satellite communication in the related technology under the scenes of low signal-to-noise ratio and large frequency deviation is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a wireless communication system in the related art;
FIG. 2 is a flow chart of a method of detection of unique codes according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing GMR frame structure and NT6 burst using a User Data type unique code;
fig. 4(a) is a schematic diagram of the calculation of a dual angle difference when Δ k is 1 in an implementation according to the present invention;
fig. 4(b) is a schematic diagram of the calculation of a dual angle difference when Δ k is 80 in an implementation in accordance with the invention;
fig. 4(c) is a schematic diagram of the calculation of a dual angle difference when Δ k is 88 in an implementation in accordance with the invention;
fig. 4(d) is a schematic diagram of the calculation of a dual angle difference when Δ k is 169 in accordance with the present invention; and
fig. 5 is a schematic diagram of a unique code detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above 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 invention 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 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for detecting unique code, it is noted that the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that illustrated herein.
Fig. 2 is a flowchart of a method for detecting a unique code according to an embodiment of the present invention, as shown in fig. 2, the method including the steps of:
step S201, obtaining an error between a first signal parameter of each unique code and a second signal parameter of each unique code, where the first signal parameter is a signal parameter of a unique code in a signal of a transmitting end, the second signal parameter is a signal parameter of a unique code in a signal of a receiving end, and the signal parameter is obtained according to an angle difference of a unique code symbol with a distance of n.
Specifically, the transmitting end signal is a local signal of the signal transmitting end, and the receiving end signal is a signal that is filtered, modulated, and the like to be transmitted to the signal receiving end. The angle difference of the unique code symbols can be obtained by conjugate multiplication of the unique code symbols. The signal parameter obtained according to the angle difference of the unique code symbol may be a dual angle difference obtained by calculating the angle difference based on the angle difference of the unique code symbol.
N is a positive integer, and n may take multiple values, so that multiple sets of signal parameters can be obtained, and therefore, in an optional embodiment, the first signal parameter and the second signal parameter are both a set of multiple sets of signal parameters.
In one embodiment, two unique codes are carried in the signal, and then the signal parameters of the two unique codes in the signal at the transmitting end, i.e. the first signal parameters, and the signal parameters of the two unique codes in the signal at the receiving end, i.e. the second signal parameters, are obtained respectively. An error between each first signal parameter and each second signal parameter is then obtained. For example: the two unique codes are UW1 and UW2 respectively, the first signal parameter of UW1 is r (UW1), the first signal parameter of UW2 is r (UW2), and the two signal parameters in the receiving end signal are p (1) and p (2) (at this time, which unique code is specifically corresponding to the two signal parameters in the receiving end signal is unknown); then obtaining the error includes: the error between r (UW1) and p (1), the error between r (UW1) and p (2), the error between r (UW2) and p (1), and the error between r (UW2) and p (2).
Step S203, determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter.
In particular, the type of unique code described above may be used to represent the logical channel carried by the unique code. In an alternative embodiment, still illustrated with two unique codes UW1 and UW2 carried in the signal, if the error between r (UW1) and p (1) is less than the error between r (UW1) and p (2), p (1) corresponds to the unique code UW 1; the error between r (UW2) and p (1) is larger than the error between r (UW2) and p (2), and the unique code corresponding to p (2) is UW 2.
It should be noted that, in this embodiment, the steps may be executed by the signal of the signal receiving end, and may also be executed by other devices. The signal sequence of the unique code in the local signal, i.e. the transmitting-end signal, is known, i.e. the type of the unique code in the transmitting-end signal is known, in which case the type of each unique code in the receiving-end signal can be determined in the above-described manner.
As can be seen from the above, in the above embodiments of the present application, an error between a first signal parameter of each unique code and a second signal parameter of each unique code is obtained, where the first signal parameter is a signal parameter of a unique code in a signal at a transmitting end, and the second signal parameter is a signal parameter of a unique code in a signal at a receiving end; determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter. The above scheme determines the type of the unique code signal in the receiving end signal through the error between the signal parameter of the unique code in the transmitting end signal and the signal parameter of the unique code in the receiving end signal, and the signal parameter is obtained according to the angle difference value of the unique code symbol with the distance of n, thereby weakening the influence of noise on the unique code symbol through the angle difference value mode, further enabling the unique code signal to adapt to large frequency deviation, phase shift and noise, and solving the technical problem of poor performance of the unique code detection in satellite communication in the related technology under the scenes of low signal-to-noise ratio and large frequency deviation.
As an optional implementation, the signal parameter includes multiple sets of dual angle difference values, where the dual angle difference values are used to represent second dual angle difference values obtained on the basis of first dual angle difference values, the first dual angle difference values are used to represent differences between unique code symbols with a distance n, the second dual angle difference values are used to represent differences between adjacent first dual angle difference values, and the distance parameter n of each set of dual angle difference values is different; obtaining an error between a first signal parameter of each unique code and a second signal parameter of each unique code, comprising: acquiring a first duplicate angle difference value of each unique code in a signal of a sending end; acquiring a second dual angle difference value of each unique code in the signal of the receiving end; an error is determined based on the first duplex angle difference and the second duplex angle difference.
Specifically, the first weight angle difference and the second weight angle difference may be obtained by conjugate multiplication. The manner in which the first signal parameter and the second signal parameter are obtained is described in detail below.
As an alternative embodiment, obtaining the second dual angle difference value of each unique code in the signal at the receiving end includes: obtaining a distance parameter n; acquiring a normalized difference value of two unique code symbols with the distance of n in a receiving end signal, wherein the normalized difference value is obtained by normalizing the difference value of the two unique code symbols with the distance of n; and carrying out conjugate multiplication on the normalized difference values of the two unique code symbols to obtain a second dual angle difference value between the two unique code symbols with the distance n.
It should be noted that the angle difference between the unique code symbols with the distance of n introduces noise caused by frequency offset, and the above scheme of the present application achieves the effect of eliminating frequency offset noise by the dual angle difference value of the difference of two different initial symbols by Δ k symbols.
As an alternative embodiment, obtaining a normalized difference value of two unique code symbols with a distance of n in a receiving end signal includes: acquiring a received receiving end signal; changing additive noise in the receiving end signal into multiplicative noise to obtain a changed receiving end signal; acquiring a difference value of two unique code symbols with a distance of n in the changed receiving end signal; and normalizing the difference value of the two unique code symbols with the distance n to obtain a normalized difference value.
Specifically, the receiving end signal is a signal transmitted to the receiving end, has a certain noise, and changes additive noise in the receiving end signal into multiplicative noise, so as to facilitate subsequent operations, and the difference value of two unique code symbols with a distance of n can be operated in a conjugate multiplication manner.
It should be noted that, in the above embodiments of the present application, the difference between two unique code symbols with a distance n is normalized, so as to achieve the purpose of weakening the influence of noise on the amplitude.
The acquisition of the second dual angle difference is described below as an alternative embodiment, in which the distance parameter n is represented by Δ k. In a communication system, the signals at the transmitting end are:
g(k)＝s(k) (1)
wherein the content of the first and second substances,
the received signal is (in the presence of off-symbol delay, frequency offset, phase shift and noise):
r(k)＝s(k-τ)ej[2π(k-τ)TΔf+θ]+n(k-τ)，k＝1，2，...，L (2)
wherein k represents the position number of each received symbol in the whole sequence, L is the total length of the received sequence, τ represents the symbol delay, Δ f is the frequency offset, θ is the unknown initial phase, and T is the symbol period. n is AWGN additive noise.
For the convenience of analysis, the additive noise is changed into the multiplicative noise, and then the formula (2) is changed into
r(k)＝A(k-τ)s(k-τ)ej[2π(k-π)TΔf+θ+p(k-τ)]，k＝1，2，...，L (3)
In equation (3), a (k) and p (k) are the effects of noise on the amplitude and phase of the signal, respectively.
Then the angular difference between the two receiving ends that differ by Δ k symbols can be obtained by the following formula:
rPD(Δk)＝r(k+Δk)·r(k)*＝A(k-τ+Δk)A(k-τ)s(k-τ+Δk)s(k- τ*ej[2πTΔkΔf+pk-τ+Δk-pk-τ] (4)
under low snr conditions, noise affects nearby symbols similarly, so it is believed that, at smaller ak values,
therefore, when the value of Δ k is small, equation (5) can be obtained:
rPD(Δk)＝A(k-τ+Δk)A(k-τ)s(k-τ+Δk)s(k-τ)*ej[2πTΔkΔf] (5)
it should be noted that the inter-symbol angular difference of Δ k symbols introduces 2 π T Δ k Δ f due to frequency offset, and the above scheme is applied to eliminate 2 π T Δ k Δ f by the dual angular difference of two different starting symbols, which differ by Δ k symbols.
At pair normalization of rPD(Δ k) normalization to attenuate noise pairsThe effect of the amplitude.
The symbols k at two different positions can be obtained by the formula1、k2For the starting symbols, normalized difference values r of their respective phase differences Δ k symbols are calculatedPD′(Δkk1) And rPD′(Δkk2) Wherein k is1＜k2＜L，Δk+k2Less than or equal to L. The conjugate multiplication is carried out on the two to obtain
It is to be noted that, in the formula (7), the angular difference of the phase affected by the noise is [ p (k) ]2-τ+ Δk)-p(k2-τ)]-[p(k1-τ+Δk)-p(k1-τ)]I.e., [ p (k) ]2-τ+Δk)-p(k1-τ+ Δk)]-[p(k2-τ)-p(k1-τ)]. If k is1And k2The phase difference is small and the phase difference is small,
at this time, the dual angle difference of the received signal can be approximated as
Similarly, the same position k of the transmission signal can be calculated1、k2The angle difference value of the starting symbols which are respectively different by delta k symbols is subjected to conjugate multiplication, and the angle difference value can be obtained
The dual angle difference of the symbols at the transmitting end is
If τ is equal to 0, the sending-end dual angle difference is equal to the receiving-end dual angle difference.
As an alternative embodiment, obtaining the first dual angle difference value of each unique code in the signal at the transmitting end includes: obtaining a distance parameter n; conjugate multiplication is carried out on two unique code symbols with the distance of n in a signal of a sending end to obtain a first weight angle difference value of the two unique code symbols with the distance of n; carrying out conjugate multiplication on adjacent first angle difference values to obtain a double angle difference value corresponding to the distance parameter n; and determining a set of dual angle difference values corresponding to the plurality of distance parameters n as a first dual angle difference value of each unique code in the signal of the transmitting end.
Specifically, the n may be determined according to the length of the unique code symbol in the transmitting end signal and the distance between each unique code.
In an alternative embodiment, the unique code of NT6 burst defined in the satellite mobile communication system specification GMR is exemplified. Table one shows two unique code types of NT6, and fig. 3 is a diagram showing a GMR frame structure using a User Data type unique code.
As can be seen from table one, NT6 burst has two UWs, i.e., FACCH (fast associated control channel type) and User Data (User Data type), can carry two logical channels, i.e., FACCH (fast associated control channel) and TCH6 (traffic channel 6), and defines the arrangement of unique codes in the transmitted signal sequence under each type, e.g., occupied positions and corresponding bit values.
In conjunction with the diagram of NT6 burst shown in fig. 3, NT6 indicates normal traffic of 6 slots, the burst occupies 6 slots, (i.e. 0-5 slots in fig. 3), and has 468 bits in total, each type of UW is divided into three segments, which are shown as UW1, UW2 and UW3, and the positions are 57-68 bits (i.e. HSN57-HSN68, which has 12bits in total), 239-244 bits (which has 6bits in total), 395-400 bits (which has 6bits in total), according to the QPSK modulation characteristics, each two bits represent a symbol, and the lengths of the three segments of UW symbols are 6, 3, and 3, respectively.
The first dual angle difference of each unique code in the receiving-end signal can be obtained by following the following steps, in this embodiment, 88 sets of distance parameters n are provided, and Δ k is used to represent the distance parameters n in the following embodiments.
S31, as shown in fig. 4(a), when Δ k is 1 (and the distance parameter n), conjugate multiplication is performed on the adjacent unique code symbols, that is, the angle difference between adjacent symbols is obtained, so as to obtain 9 groups of differences, and the differences are arranged in order from 1 to 9 according to the value of k (k represents the position number of each received symbol in the whole sequence), and include the angle 2 pi T Δ f caused by frequency offset; the 9 sets of difference information are sequentially subjected to conjugate multiplication (1 and 2, 1 and 3, …, 1 and 9, 2 and 3, 2 and 4, …, 2 and 9, … 8 and 9), so that 36 sets of dual angle differences can be obtained
S32, Δ k being 2, 15 sets of dual angle differences can be obtained
S33, Δ k being 3, 3 sets of dual angle differences can be obtained
S34, Δ k being 4, 1 dual angle difference can be obtained
S35, as can be seen in FIG. 3, the difference between UW1 and UW2 is 85 symbols, and the difference between UW2 and UW3 is 78 symbols. Thus, when Δ k is 80, 1 dual angle difference can be obtained
When Δ k is 81, 3 sets of dual angle differences can be obtained
(i ═ 1, 2, 3); when Δ k is 82, 1 dual angle difference can be obtained
Fig. 4(b) shows a schematic diagram of the algorithm as Δ k ═ 80.
S36, Δ k being 87, 1 dual angle difference can be obtained
When Δ k is 88, 89, 90, 91, 3 sets of dual angle differences can be obtained
When Δ k is 92, 1 dual angle difference can be obtained
Fig. 4(c) shows an algorithm diagram of Δ k 88.
S37, Δ k 168, 1 dual angle difference can be obtained
Each of the 3 sets of dual angle differences may be obtained when Δ k is 169, 170, 171, 172
Respectively carrying out dual angle difference operation on the FACCH and User Data unique codes to respectively obtain 88 groups of anglesDifference value
(N takes 1 and 2 to represent the unique code types as FACCH and User Data, respectively).
As an alternative embodiment, determining the error according to the first dual angle difference and the second dual angle difference includes: acquiring a preset sliding window; acquiring errors corresponding to each group of dual angle difference values according to the sliding window; and determining the sum of the errors corresponding to each group of dual angle difference values as an error.
Specifically, the preset sliding window may be disposed at the signal receiving end. In the above embodiment, a sliding window C may be set at the receiving end, and the corresponding 88 sets of first dual angle differences are obtained according to the above sequence
And 88 sets of second dual angle difference values
When the sliding window value is C, the dual angle error between the received signal and the unique code with the type of N is epsilon, then
As an alternative embodiment, determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter includes: acquiring the type of each unique code in a signal of a sending end; searching a second signal parameter with the minimum error with a target first signal parameter from errors between the first signal parameter and the second signal parameter, wherein the target first signal parameter is any one unique code in a signal of a transmitting end; and determining the type of the unique code corresponding to the searched second signal parameter, wherein the type of the unique code corresponding to the searched second signal parameter is the same as that of the unique code corresponding to the target first signal parameter.
In the above embodiment of the present application, since the local unique code sequence is known, a sliding window is set, and for each unique code, the corresponding receiving end dual angle difference and the local unique code sequence dual angle difference are obtained, the sum of the absolute values of the differences indicates the error between the receiving end signal and the transmitting end signal under the sliding window value, all values of the sliding window are traversed, and the unique code with the smallest error among several types of unique code sequences, i.e., the unique code of the transmitting end, is found.
In an alternative embodiment, the second signal parameter with the smallest error from the target first signal parameter can be determined by traversing the value of C, where N is the estimated unique code type when epsilon (N, i, C) is the smallest.
Example 2
The present application also provides a unique code detection apparatus for performing the unique code detection method in embodiment 1. Fig. 5 is a schematic diagram of an apparatus for detecting a unique code according to an embodiment of the present invention, which, in conjunction with fig. 5, includes:
an obtaining module 50, configured to obtain an error between a first signal parameter of each unique code and a second signal parameter of each unique code, where the first signal parameter is a signal parameter of a unique code in a signal of a transmitting end, the second signal parameter is a signal parameter of a unique code in a signal of a receiving end, and the signal parameter is obtained according to an angle difference of a unique code symbol with a distance n.
A determining module 52, configured to determine a type of each unique code in the receiving-end signal according to an error between the first signal parameter and the second signal parameter.
As an alternative embodiment, the signal parameter includes multiple sets of dual angle difference values, where the dual angle difference values are used to represent second dual angle difference values obtained on the basis of the first dual angle difference values, the first dual angle difference values are used to represent differences between unique code symbols with a distance n, the second dual angle difference values are used to represent differences between adjacent first dual angle difference values, and the distance parameter n of each set of dual angle difference values is different; the acquisition module comprises: the first obtaining submodule is used for obtaining a first duplicate angle difference value of each unique code in a signal of a sending end; the second obtaining submodule is used for obtaining a second dual-angle difference value of each unique code in the signal of the receiving end; and the first determining submodule is used for determining an error according to the first dual angle difference value and the second dual angle difference value.
As an alternative embodiment, the second obtaining sub-module includes: a first acquisition unit configured to acquire a distance parameter n; the second acquisition unit is used for acquiring a normalized difference value of two unique code symbols with the distance of n in the receiving end signal, wherein the normalized difference value is obtained by normalizing the difference value of the two unique code symbols with the distance of n; and the operation unit is used for carrying out conjugate multiplication on the normalized difference values of the two unique code symbols to obtain a second dual angle difference value between the two unique code symbols with the distance n.
As an alternative embodiment, the second obtaining unit includes: the first acquisition subunit is used for acquiring the received receiving end signal; the changing subunit is used for changing the additive noise in the receiving end signal into multiplicative noise to obtain a changed receiving end signal; the second acquiring subunit is used for acquiring the difference value of two unique code symbols with the distance of n in the changed receiving end signal; and the normalization subunit is used for normalizing the difference value of the two unique code symbols with the distance of n to obtain a normalized difference value.
As an alternative embodiment, the first obtaining sub-module includes: the method comprises the following steps: a third obtaining subunit, configured to obtain a distance parameter n; the first multiplying subunit is configured to perform conjugate multiplication on two unique code symbols with a distance of n in the signal at the sending end to obtain a first heavy angle difference value of the two unique code symbols with the distance of n; the second multiplying unit is used for carrying out conjugate multiplication on the adjacent first heavy angle difference values to obtain a double angle difference value corresponding to the distance parameter n; the determining subunit is configured to determine a set of dual angle differences corresponding to the multiple distance parameters n as a first dual angle difference for each unique code in the signal at the transmitting end.
As an alternative embodiment, the first determination submodule includes: a third obtaining unit, configured to obtain a preset sliding window; the fourth obtaining unit is used for obtaining the error corresponding to each group of dual angle difference values according to the sliding window; and the determining unit is used for determining the sum of the errors corresponding to each group of the dual angle difference values as an error.
As an alternative embodiment, determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter includes: the third obtaining submodule is used for obtaining the type of each unique code in the signal of the sending end; the searching submodule is used for searching for a second signal parameter with the minimum error with a target first signal parameter from errors between the first signal parameter and the second signal parameter, wherein the target first signal parameter is any one unique code in a signal of a sending end; and the second determining submodule is used for determining the type of the unique code corresponding to the searched second signal parameter, and the type of the unique code corresponding to the target first signal parameter is the same as that of the unique code corresponding to the target first signal parameter.
Example 3
The present application also provides a storage medium characterized in that the storage medium includes a stored program, wherein the apparatus in which the storage medium is located is controlled to execute the detection method of the unique code described in embodiment 1 when the program runs.
Example 4
The present application further provides a processor, wherein the processor is configured to execute a program, and the program executes the method for detecting the unique code described in embodiment 1.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. A method for detecting a unique code, comprising:
acquiring an error between a first signal parameter of each unique code and a second signal parameter of each unique code, wherein the first signal parameter is a signal parameter of the unique code in a signal of a sending end, the second signal parameter is a signal parameter of the unique code in a signal of a receiving end, and the signal parameter is obtained according to an angle difference value of a unique code symbol with a distance of n;
determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter;
wherein determining the type of each unique code in the receiving end signal according to the error between the first signal parameter and the second signal parameter comprises:
acquiring the type of each unique code in the signal of the transmitting end;
searching a second signal parameter with the minimum error with a target first signal parameter from errors between the first signal parameter and the second signal parameter, wherein the target first signal parameter is any one unique code in the signal of the transmitting end;
and determining the type of the unique code corresponding to the searched second signal parameter, wherein the type of the unique code corresponding to the searched second signal parameter is the same as that of the unique code corresponding to the target first signal parameter.
2. The method of claim 1, wherein the signal parameters comprise a plurality of sets of dual angle difference values, the dual angle difference values being used to represent second heavy angle difference values obtained on the basis of first heavy angle difference values, the first heavy angle difference values being used to represent differences between unique code symbols at a distance n, the second heavy angle difference values being used to represent differences between adjacent first heavy angle difference values, the distance parameter n for each set of dual angle difference values being different;
acquiring an error between a first signal parameter of each unique code and a second signal parameter of said each unique code, comprising:
acquiring a first double angle difference value of each unique code in a signal of a sending end;
acquiring a second dual angle difference value of each unique code in the receiving end signal;
determining the error based on the first dual angle difference and the second dual angle difference.
3. The method of claim 2, wherein obtaining the second dual angle difference value for each unique code in the transmitter signal comprises:
acquiring the distance parameter n;
acquiring a normalized difference value of two unique code symbols with the distance of n in a receiving end signal, wherein the normalized difference value is obtained by normalizing the difference value of the two unique code symbols with the distance of n;
and carrying out conjugate multiplication on the normalized difference values of the two unique code symbols to obtain a second dual angle difference value between the two unique code symbols with the distance of n.
4. The method of claim 3, wherein obtaining the normalized difference of two unique code symbols with a distance of n in the receiving end signal comprises:
acquiring a received receiving end signal;
changing additive noise in the receiving end signal into multiplicative noise to obtain a changed receiving end signal;
acquiring a difference value of two unique code symbols with a distance of n in the changed receiving end signal;
and normalizing the difference value of the two unique code symbols with the distance of n to obtain the normalized difference value.
5. The method of claim 2, wherein obtaining a first duplicate angle difference value for each unique code in a signal at a transmitting end comprises:
acquiring the distance parameter n;
conjugate multiplication is carried out on two unique code symbols with the distance of n in the sending end signal, and a first weight angle difference value of the two unique code symbols with the distance of n is obtained;
conjugate multiplication is carried out on the adjacent first heavy angle difference values to obtain a double angle difference value corresponding to the distance parameter n;
determining a set of dual angle differences corresponding to the plurality of distance parameters n as a first dual angle difference of each unique code in the transmitting end signal.
6. The method of claim 2, wherein determining the error based on the first dual angle difference value and the second dual angle difference value comprises:
acquiring a preset sliding window;
acquiring errors corresponding to each group of dual angle difference values according to the sliding window;
and determining the sum of the errors corresponding to each group of the dual angle difference values as the error.
7. An apparatus for detecting a unique code, comprising:
an obtaining module, configured to obtain an error between a first signal parameter of each unique code and a second signal parameter of each unique code, where the first signal parameter is a signal parameter of the unique code in a signal at a transmitting end, the second signal parameter is a signal parameter of the unique code in a signal at a receiving end, and the signal parameter is obtained according to an angle difference of a unique code symbol with a distance n;
a determining module, configured to determine a type of each unique code in the receiving-end signal according to an error between the first signal parameter and the second signal parameter;
wherein the determining module comprises:
a third obtaining submodule, configured to obtain a type of each unique code in the signal at the transmitting end;
the searching submodule is used for searching a second signal parameter with the minimum error with a target first signal parameter from errors between the first signal parameter and the second signal parameter, wherein the target first signal parameter is any one unique code in the signal of the transmitting end;
and the second determining submodule is used for determining the type of the unique code corresponding to the searched second signal parameter, and the type of the unique code corresponding to the target first signal parameter is the same as the type of the unique code corresponding to the target first signal parameter.
8. A storage medium comprising a stored program, wherein the program, when executed, controls an apparatus in which the storage medium is located to perform the method for detecting a unique code according to any one of claims 1 to 6.
9. A processor for running a program, wherein the program is run to perform the method for detecting unique code of any one of claims 1 to 6.
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