CN114422087A - Collision signal identification method and system - Google Patents
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Abstract
The invention discloses a method and a system for identifying collision signals, which comprise the following steps: in the process of generating a signal frame, mapping the preamble information and the filling information into a first constellation, mapping the useful information into a second constellation, wherein the points of the first constellation and the second constellation are different, sending the generated signal frame to a receiver through a wireless channel, obtaining a baseband signal waveform corresponding to the preamble information from the signal frame by the receiver, calculating the preset index information of the overlapped signal of the target position in the signal frame, and determining whether the overlapped signal of the target position of the signal frame contains the useful information according to the relation between the preset index information and the reference value. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the preset index information of the baseband signal waveform corresponding to the preamble information is used as a reference value to identify the information of the target position on the signal frame, thereby improving the accuracy of useful information identification.
Description
Technical Field
The present invention relates to the field of signal processing, and in particular, to a method and a system for identifying a collision signal.
Background
Cellular mobile communications have developed most rapidly in the field of communications, and cellular mobile communication systems have undergone five generations of evolution, and the adopted channel multiple access technology has undergone a change from FDMA, TDMA, CDMA to OFDMA, and the multiple access technology refers to an address identification technology that enables communications among multiple users, where the intra-frame multiplexing technology is a multiple access technology that characterizes the channel occupancy of different users by designing the frame structure in such a way that useful information appears at different positions within the frame.
For the intra-frame multiplexing technology, for example, the transmission time shared by a plurality of users is divided into a shared part and an exclusive part, wherein each user in the shared part transmits the same field, such as preamble information, a synchronous word and the like; in the exclusive part, each user writes 'useful information' in the exclusive part to indicate that the user occupies the channel, otherwise, writes 'filling information' in the exclusive part to indicate that the user does not occupy the channel. In this case, it is necessary to identify the "useful information" of the user from the colliding overlapping signals, but after the signal passes through the wireless channel, a certain influence may be exerted on the signal, thereby increasing the difficulty in identifying the colliding signal. Thus, a method for accurately recognizing the collision signal is needed.
Disclosure of Invention
In view of this, the embodiment of the present invention discloses a method, a system, a receiver and a transmitter for identifying a collision signal, which solve the problem in the prior art that the collision signal cannot be accurately identified.
In a first aspect: the embodiment of the invention discloses a collision signal identification method, which applies a receiver and comprises the following steps:
after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; the constellation points mapped by the preamble information and the filling information in the signal frame are the same, and the constellation points mapped by the useful signal and the constellation points mapped by the filling information are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of an overlapped signal of a target position in the signal frame;
if the preset index information of the overlapped signal exceeds the fluctuation range of the reference value, the overlapped signal representing the target position contains useful information; and if the preset index information of the overlapped signal is in the fluctuation range of the reference value, the overlapped signal of the target position only contains filling information.
Optionally, the determining a reference value based on the baseband signal waveform corresponding to the preamble information includes:
acquiring an I path signal and/or a Q path signal corresponding to the preamble information;
and calculating a reference value according to the corresponding I path signal and Q path signal in the leading information.
Optionally, the calculating preset index information of the overlapped signal of the target position in the signal frame includes:
acquiring an I path signal and a Q path signal of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal of the target position in the signal frame.
Optionally, the preset index information is mean information or variance information or standard deviation information of the I-path signal and the Q-path signal of the target position in the signal frame.
Optionally, the reference value is calculated according to the I-path signal and the Q-path signal corresponding to the preamble information:
acquiring statistical characteristic information of a lead code I path signal and a lead code Q path signal corresponding to the overlapped signals;
based on the statistical property information, a reference value is determined.
In a first aspect: the embodiment of the invention discloses a collision signal identification method, which applies a transmitter and comprises the following steps:
in the process of generating the signal frame, mapping the preamble information and the filling information into a first constellation point, and mapping the useful information into a second constellation point; the first and second constellation points are different;
writing a first coordinate corresponding to the first constellation point in the positions corresponding to the preamble information and the filling information of the signal frame respectively, and writing a second coordinate corresponding to the second constellation point in the position of the subframe corresponding to the useful information;
and transmitting the signal frame written with the coordinates corresponding to the constellation point to a transmitter so that the receiver demodulates the signal frame to obtain constellation point information in the signal frame, and distinguishing signals in the signal frame based on the constellation point information.
Optionally, the first constellation point and the second constellation point are determined from different energy distribution characteristics of an I-path signal and a Q-path signal in the constellation point.
Optionally, the method further includes:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
The embodiment of the invention discloses a collision signal identification system, which comprises:
a receiver and a transmitter;
the receiver is configured to perform the method for identifying a collision signal according to the first aspect;
the transmitter is configured to perform a collision signal identification method according to any one of the second aspect.
The embodiment of the invention discloses a receiver, which comprises:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing the collision signal identification method of the first aspect when the program is executed.
The embodiment of the invention discloses a transmitter, which comprises:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing the collision signal identification method of the second aspect when the program is executed.
The embodiment of the invention discloses a method and a system for identifying collision signals, wherein the method comprises the following steps: in the process of generating a signal frame, mapping the preamble information and the filling information into a first constellation, and mapping the useful information into a second constellation, wherein points of the first constellation and the second constellation are different, and sending the generated signal frame to a receiver through a wireless channel, the receiver acquires a baseband signal waveform corresponding to the preamble information from the signal frame, determines a reference value according to preset index information of the baseband signal waveform, calculates the preset index information of an overlapped signal at a target position in the signal frame, and determines whether the overlapped signal at the target position of the signal frame contains the useful information according to the relationship between the preset index information and the reference value. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the information of the target position on the signal frame is identified by taking the preset index information of the baseband signal waveform corresponding to the preamble information as a reference value, so that the accuracy of identifying useful information is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an interaction diagram illustrating collision signal identification provided in embodiment 1 of the present invention;
fig. 2 shows a schematic diagram of the structure of a signal frame;
FIG. 3 shows a comparative schematic for identifying overlapping signals;
fig. 4 is a schematic flow chart illustrating a collision signal identification method according to embodiment 2 of the present invention;
fig. 5 is a schematic flow chart of embodiment 3 of a method for identifying a collision signal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram illustrating a collision signal recognition system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a transmitter according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a receiver according to an embodiment of the present invention.
Detailed Description
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.
Example 1:
referring to fig. 1, an interaction diagram of collision signal identification provided in embodiment 1 of the present invention is shown, in this embodiment, the method includes:
s101: the transmitter maps the preamble information and the filling information to a first constellation point and maps useful information to a second constellation point in the process of generating a signal frame; the first and second constellation points are different;
in the field of digital communications, digital signals are often represented on a complex plane to visually represent the relationship between the signals, and such a diagram is a constellation diagram. In this embodiment, the preamble information and the padding information are mapped to the same constellation point, and the useful information is mapped to a constellation point different from the preamble information and the padding information. The method comprises the steps that leading information and filling information are mapped into first constellation points, useful information is mapped into second constellation points, the first constellation points and the second constellation points are different, and when the leading information and the filling information are mapped into the first constellation points, first coordinates of the first constellation points are recorded; correspondingly, when the useful information is mapped to the second constellation point, the second coordinate corresponding to the second constellation point is recorded. In one embodiment, the energy distribution characteristics of the first constellation point and the second constellation point are different, for example, different energy distribution characteristics of the constellation points in the I-path and the Q-path may be adopted to distinguish and set the first constellation point and the second constellation point, and if the first constellation point only includes the I-path, the second constellation point only includes the Q-path; if the first constellation point only includes Q paths, and the second constellation point only includes I paths, the difference of the signal energy of the I path and the Q path of the constellation point can make the useful information and the preamble information and the padding information have different energy distribution characteristics.
The process of mapping different information to corresponding constellation points may include multiple ways, which are not limited in this embodiment, and optionally, the following two ways may be included:
the first implementation mode comprises the following steps:
mapping the leading information and the filling information into a first constellation point in a fifth constellation point set, and mapping the useful information into a second constellation point in the fifth constellation point set; the first and second constellation points are different;
for example, the following steps are carried out: the fifth constellation point set includes a plurality of constellation points, including: s { +1, + j } if the preamble information is mapped to + j, the useful information is mapped to + 1.
The second embodiment:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
Based on the second embodiment, it is necessary to construct a third constellation point and a fourth constellation point in advance, where constellation points included in the constructed third constellation point set and the constructed fourth constellation point set are different.
For example, the following steps are carried out: assuming that the third set of constellation points is St, the fourth set of constellation points is Sy, the third set of constellation points is St, and the fourth set of constellation points is Sy, the following conditions are met:
Sy∩St＝φ；
for example, assume a third set of constellation points is St{ + j, -j }, and the fourth constellation point set is SyThe preamble information and the padding information may be mapped to constellation points in a third constellation set, and the useful information may be mapped to constellation points in a fourth constellation set.
S102: writing a first constellation point in the position of the subframe corresponding to the preamble information and the filling information respectively, writing a second constellation point in the position of the subframe corresponding to the useful information, and sending the signal frame to a receiver;
in this embodiment, the signal frame includes a shared portion and an exclusive portion, where a first constellation point of preamble information is written in the shared portion of the signal frame, a second constellation point of useful information is written in the exclusive portion of a user, and a first constellation point corresponding to padding information is written in a portion allocated to another user. For example, the following steps are carried out: as shown in fig. 2, the structure of a signal frame is shown, where a preamble portion is written into a first constellation point, a user 1 portion is an exclusive portion of a user 1, if the user 1 sends information, a second constellation point is written into the user 1 portion, and user 2, user 3 …, user n portions are written into the first constellation point in portions allocated to other users, besides, the frame structure further includes a guard portion and a SYNC portion, and these portions and the preamble fill in the same constellation point.
S103: after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; in this embodiment, according to the frame structure of the signal frame, preamble information may be analyzed from the signal frame, where the preamble information is represented by a baseband signal waveform.
S104: determining a reference value based on a baseband signal waveform corresponding to the preamble information;
in this embodiment, after receiving the signal frame sent by the sender, the receiver demodulates the signal frame to obtain the constellation point information in the signal frame, so that the signals in the signal frame can be distinguished based on the constellation point information. If the first constellation point only contains the I-path signal, the constellation of the signal may rotate after the transmission of the wireless channel, and therefore, Q-path signals may appear; similarly, if the first constellation point uses Q-path signals, the constellation of the signals may rotate after the wireless channel transmission, and I-path signals may appear. Therefore, when calculating the reference threshold, the I-path signal and the Q-path signal need to be considered, optionally, S104 includes:
acquiring a first constellation point corresponding to the preamble information; the first constellation point includes: i path signal and/or Q path signal;
and calculating a reference value according to the I path signal and the Q path signal in the baseband signal waveform in the preamble information.
In this embodiment, if the first constellation point only includes the I-path signal, the preamble information includes: the I path signal or the I path signal and the Q path signal; if the first constellation point is the Q-path signal, the leading information comprises the Q-path signal, or comprises the Q-path signal and the I-path signal.
For example, the following steps are carried out: the reference value can be calculated by the following consensus 1):
1)sum(abs(diff(I_symbol))+abs(diff(Q_symbol)))；
wherein diff represents difference operation, abs represents modulus operation, sum represents summation operation, and I _ symbol and Q _ symbol represent I path and Q path signals obtained by baseband processing at the receiving side, respectively.
In this embodiment, since the signal frame is affected after passing through the wireless signal, the reference value is set to a fluctuation range, for example, ± 5% may be set as a floating range.
S105: calculating a preset index of an overlapped signal of a target position in the signal frame;
in this embodiment, the target location is a location allocated to a user, and the location includes useful information of a certain user and padding information of other users, or includes padding information of all users.
As can be seen from the above description, the useful information may be represented by constellation points including only I-path signals, and the padding information may be represented by constellation points including only Q-path signals, based on which, the index information of the overlapped signal at the target position in the signal frame is calculated, including:
acquiring an I path signal and a Q path signal of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal of the target position in the signal frame.
In this embodiment, the index information may be any index capable of representing the characteristics of the target position overlapping signal, and may be, for example, a mean value, a variance, or a standard deviation.
S106: determining whether the overlapped signal at the target position contains useful information according to the relation between a preset index of the overlapped signal at the target position and a reference value;
s107: if the preset index of the overlapped signal exceeds the fluctuation range of the reference value, the overlapped signal of the target position is represented to contain useful information;
s108: and if the preset index of the overlapped signal is in the fluctuation range of the reference value, the overlapped signal of the target position only contains filling information.
For example, the following steps are carried out: as shown in fig. 3, the signal frame includes information of 8 users, where a path of idle receiving baseband waveform is close to the preamble at a position corresponding to the idle user, and at least one path of non-idle users in the I path or the Q path has significant fluctuation in waveform, and has a larger difference from the preamble baseband waveform.
In this embodiment, in a process of generating a signal frame, the preamble information and the padding information are mapped to a first constellation, and the useful information is mapped to a second constellation, where points of the first constellation and the second constellation are different, and the generated signal frame is sent to a receiver through a wireless channel, the receiver obtains a baseband signal waveform corresponding to the preamble information from the signal frame, determines a reference value according to the baseband signal waveform, calculates overlapping signal preset index information of a target position in the signal frame, and determines whether the target position of the signal frame contains the useful information according to a relationship between the preset index information and the reference value. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the preamble information is used as a reference value to identify the information of the target position on the signal frame, so that the accuracy of identifying the useful information is improved.
Example 2
Referring to fig. 4, a flow chart of a collision signal identification method provided in embodiment 2 of the present invention is shown, and in this embodiment, the method is applied to a transmitter, and the method includes:
s401: in the process of generating the signal frame, mapping the preamble information and the filling information into a first constellation point, and mapping the useful information into a second constellation point; the first and second constellation points are different;
in this embodiment, the preamble information and the padding information are mapped to the same constellation point, and the useful information is mapped to a constellation point different from the preamble information and the padding information. The leading information and the filling information are mapped into a first constellation point, the useful information is mapped into a second constellation point, the first constellation point and the second constellation point are different, and the energy distribution characteristics of the first constellation point and the second constellation point are different in one implementation mode, for example, the first constellation point and the second constellation point can be distinguished by adopting different energy distributions of an I path and a Q path of the constellation point, if the first constellation point only comprises the I path, the second constellation point only comprises the Q path; if the first constellation point only includes Q paths, and the second constellation point only includes I paths, the difference of the signal energy of the I path and the Q path of the constellation point can make different information have different energy distribution characteristics.
The process of mapping different information to corresponding constellation points may include multiple ways, which are not limited in this embodiment, and optionally, the following two ways may be included:
the first implementation mode comprises the following steps:
mapping the leading information and the filling information into a first constellation point in a fifth constellation point set, and mapping the useful information into a second constellation point in the fifth constellation point set; the first and second constellation points are different;
for example, the following steps are carried out: the fifth constellation point set includes a plurality of constellation points, including: s { +1, + j } if the preamble information is mapped to + j, the useful information is mapped to + 1.
The second embodiment:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
Based on the second embodiment, it is necessary to construct a third constellation point and a fourth constellation point in advance, where constellation points included in the constructed third constellation point set and the constructed fourth constellation point set are different.
For example, the following steps are carried out: assuming that the third set of constellation points is St, the fourth set of constellation points is Sy, the third set of constellation points is St, and the fourth set of constellation points is Sy, the following conditions are met:
Sy∩St＝φ；
for example, assume a third set of constellation points is St{ + j, -j }, and the fourth constellation point set is SyThe preamble information and the padding information may be mapped to constellation points in a third constellation set, and the useful information may be mapped to constellation points in a fourth constellation set.
S402: and writing a first coordinate corresponding to the first constellation point in the positions corresponding to the preamble information and the filling information of the signal frame respectively, and writing a second coordinate corresponding to the second constellation point in the position of the subframe corresponding to the useful information.
In this embodiment, the signal frame includes a shared portion and an exclusive portion, where a first constellation point of preamble information is written in the shared portion of the signal frame, a second constellation point of useful information is written in the exclusive portion of a user, and a first constellation point corresponding to padding information is written in a portion allocated to another user. For example, the following steps are carried out: as shown in fig. 2, the structure of a signal frame is shown, where a preamble portion is written into a first constellation point, a user 1 portion is an exclusive portion of a user 1, if the user 1 transmits information, a second constellation point is written into the user 1 portion, and user 2, user 3 …, user n portions are written into the first constellation point in the portions allocated to other users.
S403: and transmitting the signal frame written with the coordinates corresponding to the constellation point to a receiver so that the receiver demodulates the signal frame to obtain constellation point information in the signal frame, and distinguishing signals in the signal frame based on the constellation point information.
In this embodiment, after receiving a signal frame, a receiver analyzes a baseband signal waveform corresponding to preamble information in the signal frame, determines a reference value according to the baseband signal waveform, calculates a preset index of an overlapped signal at a target position in the signal frame, determines the overlapped signal at the target position in the signal frame according to a corresponding relationship between the reference value and the preset index, and identifies whether the overlapped signal contains useful information. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the preamble information is used as a reference value to identify the information of the target position on the signal frame, so that the accuracy of identifying the useful information is improved.
Example 3
Referring to fig. 5, a flow chart of embodiment 3 of a method for identifying a collision signal according to an embodiment of the present invention is shown, where the method includes:
s501: after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; the constellation points mapped by the preamble information and the filling information in the signal frame are the same, and the constellation points mapped by the useful signal and the constellation points mapped by the filling information are different;
in this embodiment, according to the frame structure of the signal frame, the preamble information may be parsed from the common portion of the signal frame, where the preamble information is represented by a baseband signal waveform.
S502: determining a reference value based on a baseband signal waveform corresponding to the preamble information;
in this embodiment, the constellation points corresponding to the preamble information may be represented in various forms, and as can be seen from the above description, the constellation points corresponding to the preamble information and the padding information are the same, but the constellation points corresponding to the useful information and the constellation points corresponding to the preamble information (and the padding information) are different, and in an implementation, for example, two different constellation points may be distinguished by using the constellation points I and Q. Assuming that the first constellation point adopts an I-path signal, after wireless signal transmission, the constellation point of the signal may rotate, and therefore, Q-paths may occur; similarly, if the first constellation point uses Q-path signals, the constellation points of the signals may rotate after being transmitted through the wireless channel, and I-path constellation points may appear. Therefore, when calculating the reference threshold, the I-path signal and the Q-path signal need to be considered, optionally, 104 includes:
acquiring an I path signal and/or a Q path signal in a constellation point corresponding to the preamble information;
and calculating a reference value according to the I path signal and the Q path signal in the baseband signal waveform in the preamble information.
In this embodiment, assuming that the constellation point corresponding to the preamble information is represented as a first constellation point, if the first constellation point is an I-path signal, ideally, the preamble information only includes the I-path signal, and if the signal frame is affected by the wireless channel, the constellation point corresponding to the preamble information may include both the I-path and the Q-path; if the first constellation point is a Q-path signal, the preamble information includes a Q-path signal, and ideally, the preamble information includes only a Q-path signal, and if the signal frame is affected by the wireless channel, the constellation point corresponding to the preamble information may include both the Q-path signal and the I-path signal.
For example, the following steps are carried out: the reference threshold may be calculated by the following equation 1):
1)sum(abs(diff(I_symbol))+abs(diff(Q_symbol)))；
wherein diff represents difference operation, abs represents modulus operation, sum represents summation operation, and I _ symbol and Q _ symbol represent I path and Q path signals obtained by baseband processing at the receiving side, respectively.
In this embodiment, since the signal frame may be affected after passing through the wireless signal, the reference value is set to have a fluctuation range, for example, ± 5% may be set as the fluctuation range, that is, ± 5% of the reference threshold is the reference threshold actually used for identifying the overlapping signal.
S503: calculating preset index information of an overlapped signal of a target position in the signal frame;
in this embodiment, the target location is a location allocated to the user, and in one case, the location includes useful information of the allocated user and padding information of other users, and in another case, the location includes padding information of the allocated user and padding information of other users.
As can be seen from the above description, in one embodiment, in order to distinguish useful information from padding information, the useful information may be represented by constellation points including only I-path signals, and the padding information may be represented by constellation points including only Q-path signals, based on which index information of an overlapped signal at a target position in a signal frame is calculated, including:
acquiring an I path signal and a Q path signal contained in a constellation point of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal in the constellation point of the target position in the signal frame.
In this embodiment, the index information may be any index capable of representing the characteristics of the target position overlapping signal, and may be, for example, a mean value, a variance, or a standard deviation.
S504: and if the preset index information of the overlapped signal exceeds the reference value, the overlapped signal representing the target position contains useful information.
For example, the following steps are carried out: as shown in fig. 3, the signal frame includes information of 8 users, where a path of idle receiving baseband waveform is close to the preamble at a position corresponding to the idle user, and at least one path of non-idle users in the I path or the Q path has significant fluctuation in waveform, and has a larger difference from the preamble baseband waveform.
In addition, if the preset index of the overlapped signal at the target position does not exceed the reference threshold, it indicates that the overlapped signal at the target position does not contain useful information.
In this embodiment, in a process of generating a signal frame, the preamble information and the padding information are mapped to a first constellation, and the useful information is mapped to a second constellation, where points of the first constellation and the second constellation are different, and the generated signal frame is sent to a receiver through a wireless channel, the receiver obtains a baseband signal waveform corresponding to the preamble information from the signal frame, determines a reference value according to the baseband signal waveform, calculates overlapping signal preset index information of a target position in the signal frame, and determines whether the target position of the signal frame contains the useful information according to a relationship between the preset index information and a reference threshold. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the preamble information is used as a reference value to identify the information of the target position on the signal frame, so that the accuracy of identifying the useful information is improved.
Referring to fig. 6, a schematic structural diagram of a collision signal recognition system according to an embodiment of the present invention is shown, and in this embodiment, the system includes:
a receiver 601 and a transmitter 602;
the transmitter is configured to perform the method described below:
in the process of generating a signal frame, mapping the preamble information and the filling information into a first constellation point, and mapping the useful information into a second constellation point; the first and second constellation points are different;
writing a first coordinate corresponding to the first constellation point in the positions corresponding to the preamble information and the filling information of the signal frame respectively, and writing a second coordinate corresponding to the second constellation point in the position of the subframe corresponding to the useful information;
and transmitting the signal frame written with the coordinates corresponding to the constellation point to a receiver so that the receiver demodulates the signal frame to obtain constellation point information in the signal frame, and distinguishing signals in the signal frame based on the constellation point information.
Optionally, the first constellation point and the second constellation point are determined from different energy distribution characteristics of an I-path signal and a Q-path signal in the constellation point.
Optionally, the method further includes:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
The receiver is configured to perform the method described below:
after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; the constellation points mapped by the preamble information and the filling information in the signal frame are the same, and the constellation points mapped by the useful signal and the constellation points mapped by the filling information are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of an overlapped signal of a target position in the signal frame;
if the preset index information of the overlapped signal exceeds the fluctuation range of the reference value, the overlapped signal representing the target position contains useful information; and if the preset index information of the overlapped signal is in the fluctuation range of the reference value, the overlapped signal of the target position only contains filling information.
Optionally, the determining a reference value based on the baseband signal waveform corresponding to the preamble information includes:
acquiring an I path signal and/or a Q path signal corresponding to the preamble information;
and calculating a reference value according to the corresponding intermediate I path signal and Q path signal in the leading information.
Optionally, the calculating preset index information of the overlapped signal of the target position in the signal frame includes:
acquiring an I path signal and a Q path signal of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal of the target position in the signal frame.
Optionally, the preset index information is mean information or variance information or standard deviation information of the I-path signal and the Q-path signal in the constellation point of the target position in the signal frame.
Alternatively to this, the first and second parts may,
the calculating a reference value according to the I-path signal and the Q-path signal corresponding to the preamble information includes:
acquiring statistical characteristic information of a lead code I path signal and a lead code Q path signal corresponding to the overlapped signals;
based on the statistical property information, a reference value is determined.
Through the system of the embodiment, the transmitter maps the preamble information and the filling information into a first constellation and maps the useful information into a second constellation in the process of generating the signal frame, wherein the first constellation and the second constellation are different in point, and transmits the generated signal frame to the receiver through a wireless channel, the receiver acquires a baseband signal waveform corresponding to the preamble information from the signal frame, calculates the preset index information of the overlapped signal of the target position in the signal frame, and determines whether the overlapped signal of the target position of the signal frame contains the useful information according to the relation between the preset index information and the reference value. Therefore, the preamble information and the filling information are mapped to the same constellation points, so that the preamble information and the filling information have the same characteristics, and the preset index information of the baseband signal waveform corresponding to the preamble information is used as a reference value to identify the information of the target position on the signal frame, so that the accuracy of identifying the useful information is improved.
Referring to fig. 7, a schematic structural diagram of a transmitter according to an embodiment of the present invention is shown, where the transmitter includes:
a memory 701 and a processor 702;
the memory 701 is used for storing a program, and the processor 702 is used for executing the following collision signal identification method when the program is executed:
in the process of generating a signal frame, mapping the preamble information and the filling information into a first constellation point, and mapping the useful information into a second constellation point; the first and second constellation points are different;
writing a first coordinate corresponding to the first constellation point in the positions corresponding to the preamble information and the filling information of the signal frame respectively, and writing a second coordinate corresponding to the second constellation point in the position of the subframe corresponding to the useful information;
and transmitting the signal frame written with the coordinates corresponding to the constellation point to a receiver so that the receiver demodulates the signal frame to obtain constellation point information in the signal frame, and distinguishing signals in the signal frame based on the constellation point information.
Optionally, the first constellation point and the second constellation point are determined from different energy distribution characteristics of an I-path signal and a Q-path signal in the constellation point.
Optionally, the method further includes:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
Referring to fig. 8, a schematic structural diagram of a receiver according to an embodiment of the present invention is shown, where the receiver includes:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing the collision signal identification method in the following way when the program is executed:
after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; the constellation points mapped by the preamble information and the filling information in the signal frame are the same, and the constellation points mapped by the useful signal and the constellation points mapped by the filling information are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of an overlapped signal of a target position in the signal frame;
if the preset index information of the overlapped signal exceeds the fluctuation range of the reference value, the overlapped signal representing the target position contains useful information; and if the preset index information of the overlapped signal is in the fluctuation range of the reference value, the overlapped signal of the target position only contains filling information.
Optionally, the determining a reference value based on the baseband signal waveform corresponding to the preamble information includes:
acquiring an I path signal and/or a Q path signal corresponding to the preamble information;
and calculating a reference value according to the corresponding I path signal and Q path signal in the leading information.
Optionally, the calculating preset index information of the overlapped signal of the target position in the signal frame includes:
acquiring an I path signal and a Q path signal of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal of the target position in the signal frame.
Optionally, the preset index information is mean information or variance information or standard deviation information of the I-path signal and the Q-path signal in the constellation point of the target position in the signal frame.
Optionally, the calculating a reference value according to the I-path signal and the Q-path signal corresponding to the preamble information includes:
acquiring statistical characteristic information of a lead code I path signal and a lead code Q path signal corresponding to the overlapped signals;
based on the statistical property information, a reference value is determined.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A method for identifying a collision signal, the method using a receiver, comprising:
after a signal frame is received, acquiring a baseband signal waveform corresponding to preamble information in the signal frame; the constellation points mapped by the preamble information and the filling information in the signal frame are the same, and the constellation points mapped by the useful signal and the constellation points mapped by the filling information are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of an overlapped signal of a target position in the signal frame;
if the preset index information of the overlapped signal exceeds the fluctuation range of the reference value, the overlapped signal representing the target position contains useful information; and if the preset index information of the overlapped signal is in the fluctuation range of the reference value, the overlapped signal of the target position only contains filling information.
2. The method of claim 1, wherein the determining the reference value based on the baseband signal waveform corresponding to the preamble information comprises:
acquiring an I path signal and/or a Q path signal corresponding to the preamble information;
and calculating a reference value according to the I path signal and the Q path signal corresponding to the leading information.
3. The method according to claim 1, wherein the calculating the preset index information of the overlapped signal of the target position in the signal frame comprises:
acquiring an I path signal and a Q path signal of a target position in the signal frame;
and calculating to obtain preset index information according to the I path signal and the Q path signal of the target position in the signal frame.
4. The method according to claim 2, wherein the predetermined index information is mean information or variance information or standard deviation information of the I-path signal and the Q-path signal of the target position in the signal frame.
5. The method according to claim 2, wherein the calculating the reference value according to the I-path signal and the Q-path signal corresponding to the preamble information comprises:
acquiring statistical characteristic information of a lead code I path signal and a lead code Q path signal corresponding to the overlapped signals;
based on the statistical property information, a reference value is determined.
6. A method for identifying a collision signal, said method using a transmitter, comprising:
in the process of generating the signal frame, mapping the preamble information and the filling information into a first constellation point, and mapping the useful information into a second constellation point; the first and second constellation points are different;
writing a first coordinate corresponding to the first constellation point in the positions corresponding to the preamble information and the filling information of the signal frame respectively, and writing a second coordinate corresponding to the second constellation point in the position of the subframe corresponding to the useful information;
and transmitting the signal frame written with the coordinates corresponding to the constellation point to a receiver so that the receiver demodulates the signal frame to obtain constellation point information in the signal frame, and distinguishing signals in the signal frame based on the constellation point information.
7. The method of claim 6, wherein the first constellation point and the second constellation point are determined from different energy distribution characteristics of an I-path signal and a Q-path signal of the constellation points.
8. The method of claim 6, further comprising:
mapping the preamble information and the filling information into a first constellation point in a third constellation point set;
mapping the useful information to a second constellation point in a fourth constellation point set;
the third constellation point and the fourth constellation point set contain different constellation points.
9. A collision signal recognition system, comprising:
a receiver and a transmitter;
the receiver is used for executing the collision signal identification method of any one of claims 1 to 5;
the transmitter is used for executing a collision signal recognition method as claimed in any one of the preceding claims 6 to 8.
10. A receiver, comprising:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing the collision signal identification method of any one of the claims 1-5 when the program is executed.
11. A transmitter, comprising:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing a collision signal identification method of any one of the preceding claims 6 to 8 when the program is executed.
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