CN114422087B - Collision signal identification method and system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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Abstract
The invention discloses a method and a system for identifying collision signals, comprising the following steps: in the process of generating a signal frame, mapping leading information and filling information into a first constellation, mapping useful information into a second constellation, wherein the first constellation and the second constellation are different, transmitting the generated signal frame to a receiver through a wireless channel, acquiring a baseband signal waveform corresponding to the leading information from the signal frame by the receiver, calculating overlapping signal preset index information of a target position in the signal frame, and determining whether the overlapping signal of the target position of the signal frame contains useful information according to the relation between the preset index information and a reference value. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading information and the filling information have the same characteristics, and the preset index information of the baseband signal waveform corresponding to the leading information is used as a reference value to identify the information of the target position on the signal frame, thereby improving the accuracy of identifying the useful information.
Description
Technical Field
The present invention relates to the field of signal processing, and in particular, to a method and system for identifying collision signals.
Background
Cellular mobile communication has been developed most rapidly in the field of communication, and the cellular mobile communication system has undergone five generations of evolution, and the adopted channel multiple access technology has undergone a change from FDMA, TDMA, CDMA to OFDMA, where the multiple access technology refers to an address identification technology for implementing communication between multiple users, and the intra-frame multiplexing technology is a multiple access technology for characterizing channel occupation situations of different users by using the way that useful information appears at different positions in a frame through the design of a frame structure.
For intra multiplexing techniques, for example, the transmission time shared by multiple users is divided into a shared portion and an exclusive portion, where each user of the shared portion transmits the same field, such as preamble information, sync word, etc.; in the exclusive part, each user writes "useful information" in the exclusive part, indicating that the user occupies the channel, and otherwise writes "filler information" in the exclusive part, indicating that the user does not occupy the channel. In this way, if a plurality of users synchronously transmit data frames to indicate the occupation condition of a channel, one subframe at the receiving side contains "useful information" and possibly "filler information", so as to cause signal collision, in this case, the "useful information" of the user needs to be identified from the overlapping signals that collide, but after the signals pass through the wireless channel, certain influence is generated on the signals, so that the identification difficulty of collision signals is increased. Thus, a method capable of accurately recognizing the collision signal is demanded.
Disclosure of Invention
In view of the above, the embodiment of the invention discloses a method, a system, a receiver and a transmitter for identifying collision signals, which solve the problem that the collision signals cannot be accurately identified in the prior art.
First aspect: the embodiment of the invention discloses a collision signal identification method, which comprises the following steps of:
after receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; the constellation points of the leading information and the filling information mapping in the signal frame are the same, and the constellation points of the useful signal mapping and the constellation points of the filling information mapping are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of overlapping signals of the target position in the signal frame;
if the preset index information of the overlapping signal exceeds the fluctuation range of the reference value, the overlapping signal representing the target position contains useful information; and if the preset index information of the overlapping signal is in the fluctuation range of the reference value, only filling information is contained in the overlapping signal representing the target position.
Optionally, the determining the 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 preamble information.
Optionally, the calculating the preset index information of the overlapping 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 value 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 preamble I path signal and a preamble Q path signal corresponding to the overlapped signal;
and determining a reference value based on the statistical characteristic information.
First aspect: the embodiment of the invention discloses a collision signal identification method, which comprises the following steps of:
mapping the leading information and the filling information into a first constellation point and mapping the useful information into a second constellation point in the process of generating the signal frame; the first constellation point and the second constellation point are different;
writing first coordinates corresponding to the first constellation points in positions corresponding to the leading information and the filling information of the signal frames respectively, and writing second coordinates corresponding to the second constellation points in positions corresponding to the useful information of the subframes;
transmitting the number frame written with the coordinates corresponding to the constellation points 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 the I-path signal and the Q-path signal in the constellation points.
Optionally, the method further comprises:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise 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 a method for identifying a collision signal according to the first aspect;
the transmitter is configured to perform a method of recognizing a collision signal according to any one of the second aspects described above.
The embodiment of the invention discloses a receiver, which comprises:
a memory and a processor;
the memory is configured to store a program, and the processor is configured to execute the method for recognizing a collision signal according to the first aspect.
The embodiment of the invention discloses a transmitter, which comprises:
a memory and a processor;
the memory is configured to store a program, and the processor is configured to execute a method for recognizing a collision signal according to the second aspect.
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 leading information and the filling information into a first constellation and mapping the useful information into a second constellation, wherein the first constellation and the second constellation are different, the generated signal frame is sent to a receiver through a wireless channel, the receiver acquires a baseband signal waveform corresponding to the leading information from the signal frame, determines a reference value according to preset index information of the baseband signal waveform, calculates preset index information of an overlapping signal of a target position in the signal frame, and determines whether the overlapping signal of the target position of the signal frame contains useful information according to the relation between the preset index information and the reference value. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading 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 leading information corresponding to the baseband signal waveform as a reference value, so that the accuracy of identifying the 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 that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 shows an interaction diagram of collision signal recognition according to 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 diagram of identifying overlapping signals;
fig. 4 is a flow chart illustrating a method for identifying collision signals according to embodiment 2 of the present invention;
fig. 5 is a schematic flow chart of embodiment 3 of a method for identifying collision signals according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an identification system for collision signals 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 shows a schematic structural diagram of a receiver according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
referring to fig. 1, an interaction diagram of collision signal recognition provided in embodiment 1 of the present invention is shown, and in this embodiment, the method includes:
s101: the method comprises the steps that a transmitter maps leading information and 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 constellation point and the second constellation point are different;
in the field of digital communications, digital signals are often represented on complex planes to visually represent the relationship between the signals, such illustration being 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 of mapping leading information and filling information into first constellation points, mapping useful information into second constellation points, wherein the first constellation points and the second constellation points are different, and recording first coordinates of the first constellation points while mapping the leading information and the filling information into the first constellation points; correspondingly, when the useful information is mapped into the second constellation point, the second coordinate corresponding to the second constellation point is recorded. In one embodiment, the energy distribution characteristics of the two paths are different, for example, a first constellation point and a second constellation point can be distinguished and set by adopting different energy distribution characteristics of the constellation point in the I path and the Q path, and if the first constellation point only comprises the I path, the second constellation point only comprises the Q path; if the first constellation point contains only Q paths and the second constellation point contains only I paths, then the difference in signal energy between the I paths and the Q paths of the constellation points may cause the useful information and the preamble and pad information to have different energy distribution characteristics.
The process of mapping different information to corresponding constellation points may include various manners, which are not limited in this embodiment, and alternatively may include the following two manners:
embodiment one:
mapping the preamble information and the padding information to first constellation points in a fifth set of constellation points, and mapping the useful information to second constellation points in the fifth set of constellation points; the first constellation point and the second constellation point are different;
illustrating: the fifth set of constellation points includes a plurality of constellation points, including, for example: s= { +1, +j } if the preamble maps to +j, the useful information maps to +1.
Embodiment two:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise 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 the constellation points included in the constructed third constellation point set and the constructed fourth constellation point set are different.
Illustrating: assuming that the third constellation point set is St, the fourth constellation point set is Sy, the third constellation point set is St, and the fourth constellation point set Sy meets the following conditions:
S y ∩S t ＝φ；
for example, assume that the third set of star points is S t = { +j, -j }, the fourth constellation point set is S y The preamble information and padding information may be mapped to constellation points in the third constellation set and the useful information may be mapped to constellation points in the fourth constellation set.
S102: writing first constellation points at the positions of subframes corresponding to the leading information and the filling information respectively, writing second constellation points at the positions of subframes corresponding to the useful information, and transmitting the signal frames to a receiver;
in this embodiment, the signal frame includes a shared portion and an exclusive portion, where a first constellation point of the preamble information is written in the shared portion of the signal frame, a second constellation point of the useful information is written in the exclusive portion of the user, and a first constellation point corresponding to the padding information is written in a portion allocated to the other user. Illustrating: as shown in fig. 2, a structure of a signal frame is shown, in which a preamble is written into a first constellation point, a user 1 is an exclusive part of the user 1, if the user 1 sends information, a second constellation point is written into a part of the user 1, and a part allocated to other users, a part of the user 2 and a part of the user 3 … are written into the first constellation point, and besides, the frame structure further includes a protection part and a SYNC part, and these parts and the preamble are filled with the same constellation point.
S103: after receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; in this embodiment, according to the frame structure of the signal frame, the preamble information may be parsed 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 transmitter, the receiver demodulates the signal frame to obtain constellation point information in the signal frame, so that signals in the signal frame can be distinguished based on the constellation point information. Because the first constellation point may rotate after being transmitted through the wireless channel if it only includes the I-channel signal, the Q-channel signal may occur; similarly, if the first constellation point adopts Q paths of signals, after the signals are transmitted through the wireless channel, the constellation of the signals may rotate, and I paths of signals may occur. Thus, in calculating the reference threshold, the I-way signal and the Q-way signal need to be considered, and optionally, S104 includes:
acquiring a first constellation point corresponding to the preamble information; the first constellation point comprises: an I-path signal and/or a 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 includes only I paths of signals, the preamble information includes: an I-path signal or an I-path signal and a Q-path signal; if the first constellation point is a Q-channel signal, the preamble information includes the Q-channel signal, or includes the Q-channel signal and the I-channel signal.
Illustrating: the reference value may be calculated by the following consensus 1):
1)sum(abs(diff(I_symbol))+abs(diff(Q_symbol)))；
wherein diff represents a difference operation, abs represents a modulo operation, sum represents a summation operation, and i_symbol and q_symbol represent I-path and Q-path signals obtained by baseband processing on 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 overlapping signal of a target position in the signal frame;
in this embodiment, the target location is a location allocated to a user, where useful information of a certain user and padding information of other users are included, or padding information of all users is included.
It is known from the above description that 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, and based on this, calculating the index information of the overlapping signals 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.
In this embodiment, the index information may be any index capable of reflecting the overlapping signal characteristics of the target position, for example, may be a mean value, a variance, or a standard deviation.
S106: determining whether useful information is contained in the overlapping signal at the target position according to the relation between the preset index of the overlapping signal at the target position and a reference value;
s107: if the preset index of the overlapping signal exceeds the fluctuation range of the reference value, the overlapping signal representing the target position contains useful information;
s108: and if the preset index of the overlapping signal is in the fluctuation range of the reference value, the overlapping signal representing the target position only contains filling information.
Illustrating: as shown in FIG. 3, the signal frame contains 8 users' information, wherein, one idle received baseband waveform, the baseband waveform at the corresponding position of the idle user is close to the preamble, while at least one idle user in the I or Q paths has obvious fluctuation in waveform, and has larger difference with the preamble baseband waveform.
In this embodiment, in the process of generating a signal frame, mapping the preamble information and the padding information into a first constellation, and mapping the useful information into a second constellation, where the first constellation and the second constellation are different, and transmitting 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 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 useful information according to a relationship between the preset index information and the reference value. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the leading 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 flowchart of a method for identifying collision signals provided in embodiment 2 of the present invention is shown, and in this embodiment, the method is applied to a transmitter, and includes:
s401: mapping the leading information and the filling information into a first constellation point and mapping the useful information into a second constellation point in the process of generating the signal frame; the first constellation point and the second constellation point 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. Wherein the preamble information and the padding information are mapped to a first constellation point, the useful information is mapped to a second constellation point, the first constellation point and the second constellation point are different, and energy distribution characteristics of the first constellation point and the second constellation point are different in one embodiment, for example, the first constellation point and the second constellation point can be distinguished by adopting different energy distributions of a constellation point I path and a constellation point Q path, and 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, the second constellation point only includes I paths, and then the difference of the signal energies of the I paths and the Q paths of the constellation points can enable different information to have different energy distribution characteristics.
The process of mapping different information to corresponding constellation points may include various manners, which are not limited in this embodiment, and alternatively may include the following two manners:
embodiment one:
mapping the preamble information and the padding information to first constellation points in a fifth set of constellation points, and mapping the useful information to second constellation points in the fifth set of constellation points; the first constellation point and the second constellation point are different;
illustrating: the fifth set of constellation points includes a plurality of constellation points, including, for example: s= { +1, +j } if the preamble maps to +j, the useful information maps to +1.
Embodiment two:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise 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 the constellation points included in the constructed third constellation point set and the constructed fourth constellation point set are different.
Illustrating: assuming that the third constellation point set is St, the fourth constellation point set is Sy, the third constellation point set is St, and the fourth constellation point set Sy meets the following conditions:
S y ∩S t ＝φ；
for example, assume that the third set of star points is S t = { +j, -j }, the fourth constellation point set is S y The preamble information and padding information may be mapped to constellation points in the third constellation set and the useful information may be mapped to constellation points in the fourth constellation set.
S402: and writing first coordinates corresponding to the first constellation points in positions corresponding to the leading information and the filling information of the signal frames respectively, and writing second coordinates corresponding to the second constellation points in positions corresponding to the subframes 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 the preamble information is written in the shared portion of the signal frame, a second constellation point of the useful information is written in the exclusive portion of the user, and a first constellation point corresponding to the padding information is written in a portion allocated to the other user. Illustrating: as shown in fig. 2, a structure of a signal frame is shown, in which a preamble is written into a first constellation point, a user 1 is an exclusive part of the user 1, if the user 1 sends information, a second constellation point is written into a part of the user 1, and a part of the user 2 and a part of the user 3 … are written into the first constellation point in a part allocated to other users.
S403: transmitting the signal frame written with the coordinates corresponding to the constellation points 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 overlapping signal of a target position in the signal frame, determines the overlapping signal of the target position in the signal frame according to a correspondence between the reference value and the preset index, and identifies whether the overlapping signal contains useful information. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the leading 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 flowchart 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 receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; the constellation points of the leading information and the filling information mapping in the signal frame are the same, and the constellation points of the useful signal mapping and the constellation points of the filling information mapping are different;
in this embodiment, the preamble information may be parsed from the common portion of the signal frame according to the frame structure 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 it is known from the above description that the constellation points corresponding to the preamble information and the padding information are the same, but the constellation points corresponding to the useful information are different from the constellation points corresponding to the preamble information (and the padding information), and in one embodiment, 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, so that Q paths may occur; similarly, if the first constellation point adopts Q paths of signals, after the signals are transmitted through the wireless channel, the constellation point of the signals may rotate, and an I path of constellation point may occur. Thus, in calculating the reference threshold, the I-way signal and the Q-way signal need to be considered, and optional 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 denoted as the first constellation point, if the first constellation point is an I-path signal, in an ideal case, 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 signal and the Q-path signal; if the first constellation point is a Q-channel signal, the preamble information includes the Q-channel signal, and ideally, the preamble information includes only the Q-channel 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-channel signal and the I-channel signal.
Illustrating: the reference threshold may be calculated by equation 1) as follows:
1)sum(abs(diff(I_symbol))+abs(diff(Q_symbol)))；
wherein diff represents a difference operation, abs represents a modulo operation, sum represents a summation operation, and i_symbol and q_symbol represent I-path and Q-path signals obtained by baseband processing on 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 the fluctuation range, that is, the reference threshold±5% is the reference threshold actually used for identifying the overlapping signal.
S503: calculating preset index information of overlapping signals of the 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.
It can be seen from the foregoing description that, in one embodiment, in order to distinguish useful information from padding information, the useful information may be represented by constellation points that include only I-path signals, and the padding information may be represented by constellation points that include only Q-path signals, and calculating, based on the constellation points, index information of overlapping signals of a target position in a signal frame includes:
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 reflecting the overlapping signal characteristics of the target position, for example, may be a mean value, a variance, or a standard deviation.
S504: and if the preset index information of the overlapping signal exceeds the reference value, the overlapping signal representing the target position contains useful information.
Illustrating: as shown in FIG. 3, the signal frame contains 8 users' information, wherein, one idle received baseband waveform, the baseband waveform at the corresponding position of the idle user is close to the preamble, while at least one idle user in the I or Q paths has obvious fluctuation in waveform, and has larger difference with the preamble baseband waveform.
In addition, if the preset index of the overlapping signal at the target position does not exceed the reference threshold, the overlapping signal indicating the target position does not contain useful information.
In this embodiment, in the process of generating a signal frame, mapping the preamble information and the padding information into a first constellation, and mapping the useful information into a second constellation, where the first constellation and the second constellation are different, and transmitting 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 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 useful information according to a relation between the preset index information and a reference threshold. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading information and the filling information have the same characteristics, and the baseband signal waveform corresponding to the leading 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, where in this embodiment, the system includes:
a receiver 601 and a transmitter 602;
the transmitter is configured to perform the method described below:
mapping the leading information and the filling information into a first constellation point and mapping the useful information into a second constellation point in the process of generating the signal frame; the first constellation point and the second constellation point are different;
writing first coordinates corresponding to the first constellation points in positions corresponding to the leading information and the filling information of the signal frames respectively, and writing second coordinates corresponding to the second constellation points in positions corresponding to the useful information of the subframes;
transmitting the signal frame written with the coordinates corresponding to the constellation points 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 the I-path signal and the Q-path signal in the constellation points.
Optionally, the method further comprises:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise different constellation points.
The receiver is configured to perform the method described below:
after receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; the constellation points of the leading information and the filling information mapping in the signal frame are the same, and the constellation points of the useful signal mapping and the constellation points of the filling information mapping are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of overlapping signals of the target position in the signal frame;
if the preset index information of the overlapping signal exceeds the fluctuation range of the reference value, the overlapping signal representing the target position contains useful information; and if the preset index information of the overlapping signal is in the fluctuation range of the reference value, only filling information is contained in the overlapping signal representing the target position.
Optionally, the determining the 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 middle I path signal and Q path signal in the preamble information.
Optionally, the calculating the preset index information of the overlapping 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 value 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 method may comprise,
the calculating the 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 preamble I path signal and a preamble Q path signal corresponding to the overlapped signal;
and determining a reference value based on the statistical characteristic information.
Through the system of this embodiment, a transmitter maps preamble information and padding information into a first constellation and maps useful information into a second constellation in the process of generating a signal frame, where the first constellation and the second constellation are different, and sends 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, calculates preset index information of an overlapping signal of a target position in the signal frame, and determines whether the overlapping signal of the target position of the signal frame contains useful information according to a relation between the preset index information and a reference value. Therefore, the leading information and the filling information are mapped into the same constellation points, so that the leading information and the filling information have the same characteristics, and the preset index information of the baseband signal waveform corresponding to the leading 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 provided in an embodiment of the present invention is shown, where in this embodiment, the transmitter includes:
a memory 701 and a processor 702;
the memory 701 is configured to store a program, and the processor 702 is configured to execute, when executing the program, one of the following collision signal recognition methods:
mapping the leading information and the filling information into a first constellation point and mapping the useful information into a second constellation point in the process of generating the signal frame; the first constellation point and the second constellation point are different;
writing first coordinates corresponding to the first constellation points in positions corresponding to the leading information and the filling information of the signal frames respectively, and writing second coordinates corresponding to the second constellation points in positions corresponding to the useful information of the subframes;
transmitting the signal frame written with the coordinates corresponding to the constellation points 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 the I-path signal and the Q-path signal in the constellation points.
Optionally, the method further comprises:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise 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 in this embodiment, the receiver includes:
a memory and a processor;
the memory is used for storing a program, and the processor is used for executing the following one of the collision signal identification methods when executing the program:
after receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; the constellation points of the leading information and the filling information mapping in the signal frame are the same, and the constellation points of the useful signal mapping and the constellation points of the filling information mapping are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of overlapping signals of the target position in the signal frame;
if the preset index information of the overlapping signal exceeds the fluctuation range of the reference value, the overlapping signal representing the target position contains useful information; and if the preset index information of the overlapping signal is in the fluctuation range of the reference value, only filling information is contained in the overlapping signal representing the target position.
Optionally, the determining the 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 preamble information.
Optionally, the calculating the preset index information of the overlapping 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 value 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 the 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 preamble I path signal and a preamble Q path signal corresponding to the overlapped signal;
and determining a reference value based on the statistical characteristic information.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to 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 (9)
1. A method of identifying a collision signal, applied to a receiver, comprising:
after receiving a signal frame, acquiring a baseband signal waveform corresponding to leading information in the signal frame; the constellation points of the leading information and the filling information mapping in the signal frame are the same, and the constellation points of the useful signal mapping and the constellation points of the filling information mapping are different;
determining a reference value based on a baseband signal waveform corresponding to the preamble information;
calculating preset index information of overlapping signals of the target position in the signal frame; the target position is a position allocated to a user, wherein the position comprises useful information of a certain user and filling information of other users, or comprises filling information of all users; the index information is any index capable of reflecting the overlapping signal characteristics of the target position;
if the preset index information of the overlapping signal exceeds the fluctuation range of the reference value, the overlapping signal representing the target position contains useful information; if the preset index information of the overlapping signal is in the fluctuation range of the reference value, the overlapping signal representing the target position only contains filling information;
the determining the 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;
acquiring statistical characteristic information of a preamble I path signal and a preamble Q path signal corresponding to the overlapped signal;
and determining a reference value based on the statistical characteristic information.
2. The method according to claim 1, wherein calculating preset index information of the overlapping signals 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.
3. The method according to claim 1, wherein the preset index information is mean information or variance information or standard deviation information of an I-path signal and a Q-path signal of a target position in the signal frame.
4. A method for identifying a collision signal, applied to a transmitter, comprising:
mapping the leading information and the filling information into a first constellation point and mapping the useful information into a second constellation point in the process of generating the signal frame; the first constellation point and the second constellation point are different;
writing first coordinates corresponding to the first constellation points in positions corresponding to the leading information and the filling information of the signal frames respectively, and writing second coordinates corresponding to the second constellation points in positions corresponding to the useful information of the subframes;
transmitting the signal frame written with the coordinates corresponding to the constellation points to a receiver, so that the receiver performs the identification method as claimed in any one of claims 1 to 3 to distinguish signals in the signal frame.
5. The method of claim 4, 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 in the constellation points.
6. The method as recited in claim 4, further comprising:
mapping the preamble information and the padding information to first constellation points in a third set of constellation points;
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 comprise different constellation points.
7. A collision signal recognition system, comprising:
a receiver and a transmitter;
-said receiver being adapted to perform a method of identifying a collision signal according to any one of claims 1-3;
the transmitter is adapted to perform a method of identifying a collision signal according to any of the preceding claims 4-6.
8. A receiver, comprising:
a memory and a processor;
the memory is adapted to store a program, and the processor is adapted to perform a method of identifying a collision signal according to any of the preceding claims 1-3 when the program is executed.
9. A transmitter, comprising:
a memory and a processor;
the memory is arranged to store a program, the processor being arranged to perform a method of identifying a crash signal as claimed in any one of the preceding claims 4-6 when the program is executed.
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