CN111726191B - Signal processing method, apparatus and computer readable storage medium - Google Patents
Signal processing method, apparatus and computer readable storage medium Download PDFInfo
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Abstract
The embodiment of the application discloses a signal processing method, a signal processing device and a computer readable storage medium, wherein the method comprises at least one of the following steps: the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine the transmitting signal parameter and/or perform signal transmission; the transmitting end transmits at least one of the security level index and the security level parameter information to the receiving end to determine the transmitting signal parameter and/or to transmit signals; the transmitting end determines the transmitting signal parameter according to at least one of the security level index, the security level parameter information and the channel information and/or performs signal transmission. The power leakage of the transmission signal determined by the embodiment of the application is minimized; the interference signals are concentrated in an angle area with higher signal leakage power, so that adjacent cell interference is avoided; random interference of multiple dimensions is transmitted in the signal leakage area to combat the existence of multiple eavesdroppers, and the security threat of multiple eavesdroppers to the wireless system is effectively reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method, a signal processing device, and a computer readable storage medium.
Background
In a wireless communication system, physical layer security has become a weak link for security maintenance of the wireless communication system due to the openness and broadcasting of wireless channels. Meanwhile, most of traditional security technologies are based on cryptography theory, and have the problems of low key distribution rate, long system time delay and the like when the number of users is large. With the frequency of eavesdropping events in recent years, how to maintain physical layer security has become an important research direction.
In wireless systems such as LTE (Long Term Evolution ) which are currently in use, a base station is equipped with multiple antennas, and a beamforming technique is adopted in the downlink direction in which the base station communicates with devices. For multi-antenna systems, signal transmission methods against eavesdroppers using beamforming have been proposed in the academia, including artificial interference techniques.
The artificial interference technology is that in a multi-antenna system, a random interference signal which is orthogonal with a secret signal in space and does not contain useful information is designed, and the secret signal is transmitted simultaneously in the same frequency, so that potential eavesdroppers are interfered, the interference of a legal receiver is avoided, and the channel advantage of a legal receiving end is established, so that the improvement of the safety rate of the system can be realized. The artificial interference technique is one of effective methods for maintaining security of a wireless physical layer in case of eavesdropper channel information.
However, the existing multi-antenna secure transmission technology based on artificial interference has the following problems:
1. Most researches only consider the situation of a single eavesdropper, the number of the eavesdroppers in the practical problem is uncertain, and a plurality of eavesdroppers can also perform cooperative eavesdropping so as to improve eavesdropping effect;
2. the traditional secret signal main lobe adopts a maximum ratio combining transmitting scheme, so that the distribution of main lobe signals in the non-receiver direction is not limited, and the problem of main lobe signal leakage exists;
3. In the case of a massive multi-antenna system facing actual deployment, there is currently insufficient research on designs and methods in massive multi-antenna systems.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a signal processing method, apparatus and computer readable storage medium, so as to solve the problem that the security capacity is low when a plurality of eavesdroppers exist in the multi-antenna system by using the existing artificial interference technology.
The technical scheme adopted by the embodiment of the application for solving the technical problems is as follows:
According to an aspect of an embodiment of the present application, there is provided a signal processing method, the method including:
the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine the transmitting signal parameter and/or perform signal transmission;
the transmitting end transmits at least one of the security level index and the security level parameter information to the receiving end to determine the transmitting signal parameter and/or to transmit signals;
The transmitting end determines the transmitting signal parameter according to at least one of the security level index, the security level parameter information and the channel information and/or performs signal transmission.
According to another aspect of the embodiment of the present application, there is provided a signal processing apparatus, including a memory, a processor, and a signal processing program stored on the memory and executable on the processor, the signal processing program implementing the steps of the signal processing method described above when executed by the processor.
According to another aspect of the embodiments of the present application, there is provided a computer-readable storage medium having stored thereon a signal processing program which, when executed by a processor, implements the steps of the signal processing method described above.
The signal processing method, the signal processing device and the computer readable storage medium of the embodiment of the application perform signal transmission by determining the transmission signal parameters and utilizing the determined transmission signal parameters; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in an angle area with higher signal leakage power, so that adjacent area interference caused by omni-directional occurrence is avoided; random interference of multiple dimensions is transmitted in the signal leakage area to combat the existence of multiple eavesdroppers, and the security threat of multiple eavesdroppers to the wireless system is effectively reduced.
Drawings
Fig. 1 is a schematic flow chart of a signal processing method according to an embodiment of the application;
Fig. 2 is a schematic diagram of a directional structure of a first beam forming vector and a second beam forming vector according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the effect of the number of independent interferers on system capacity for different numbers of eavesdroppers in the case where the eavesdroppers are processing the received signal alone;
FIG. 4 is a schematic diagram of the impact of the number of eavesdroppers on the system's security capacity at different numbers of disturbances in the case where the eavesdroppers are jointly processing the received signal;
FIG. 5 is a schematic diagram of an algorithm convergence speed for calculating a second beamforming parameter;
fig. 6 is a schematic diagram of a signal processing apparatus according to an embodiment of the application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Example 1:
As shown in fig. 1, an embodiment of the present application provides a signal processing method, which includes:
Step S11, the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine the transmitting signal parameter and/or to transmit signals;
Step S12, the transmitting end transmits at least one of the security level index and the security level parameter information to the receiving end to determine the transmitting signal parameter and/or perform signal transmission;
step S13, the transmitting end determines the transmitting signal parameters according to at least one of the security level index, the security level parameter information and the channel information and/or performs signal transmission.
In one embodiment, the transmit signal parameters include at least one of:
The size of the transmitted interference angle range, the number of interference beam forming vectors and the number of antennas required for transmission.
In one embodiment, the transmitting end determines the transmitting signal parameter by at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end, and the transmitting signal parameter comprises at least one of the following:
The transmitting end selects t security level indexes from the information fed back by the receiving end to determine transmitting signal parameters;
The transmitting end determines transmitting signal parameters according to the security level indexes fed back by the plurality of receiving ends;
wherein t is a positive integer greater than or equal to 1.
In one embodiment, the transmitting end selects a security level index from the information fed back by the receiving end to determine a transmitting signal parameter, which includes at least one of the following:
the receiving end transmits N security level indexes to the transmitting end; the transmitting end selects t security level indexes from N security level indexes fed back by the receiving end; wherein N is a positive integer greater than or equal to 1, t < = N.
In one embodiment, after the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end, the method further includes:
Feeding back service termination information to the receiving end under the condition that the security level index fed back by the receiving end does not have the level index supported by the sending end; or transmitting or feeding back a parameter corresponding to the security level close to the security level of the receiving end to determine a transmitting signal and transmitting the transmitting signal; and/or notifying the receiving end of a current security level index; or determining and transmitting a transmitting signal according to the parameters corresponding to the default security level.
In one embodiment, the transmitting end determines the transmitting signal parameter according to the security level index fed back by the plurality of receiving ends, including at least one of the following:
the transmitting end transmits a grade index vector to the plurality of receiving ends;
the sending end receives the needed grade index information fed back by the plurality of receiving ends, selects one or more receiving ends from the grade index information, and/or the safety grade index corresponding to the receiving ends.
In one embodiment, the sending end receives the required level index information fed back by the multiple receiving ends, and then further includes:
Under the condition that the transmitting end resources are saturated, the transmitting end feeds back service termination information to the plurality of receiving ends; or alternatively
Only a portion of the plurality of receiving ends are served, and signaling is performed based on the security level information fed back by the receiving ends and/or the supportable security level capabilities of the transmitting ends.
In one embodiment, the transmitting end sends at least one of the security level index and the security level parameter information to the receiving end to determine the transmission signal parameter, which includes at least one of the following:
the receiving end feeds back channel information obtained through channel estimation to the transmitting end;
the receiving end feeds back one or more grade indexes selected based on the current service type to the transmitting end;
the receiving end feeds back the required grade index information determined based on the current service type to the transmitting end.
In one embodiment, the receiving end feeds back to the transmitting end one or more level indexes selected based on the current service type, including at least one of the following:
the transmitting end transmits N grade index vectors to the receiving end;
and the receiving end selects one or more grade indexes from the N grade index vectors according to the service type, wherein N is a positive integer greater than or equal to 1.
In one embodiment, the method further comprises:
The receiving end feeds back service termination information to the transmitting end under the condition that no grade index required by the service type exists in the N grade index vectors; or transmitting or feeding back a parameter corresponding to the security level close to the security level of the receiving end to determine a transmitting signal and transmitting the transmitting signal; and/or notifying the receiving end of a current security level index; or determining and transmitting a transmitting signal according to the parameters corresponding to the default security level.
In order to better illustrate the inventive concepts of the present application, the following description is made in connection with single user, multi-user, etc:
Example 2:
The embodiment of the application provides a signal processing method, which comprises the following steps of:
the transmitting end and the receiving end are preset with the same security level parameter table, and the security level parameter table comprises a level index and signal processing parameters.
Wherein, the grade index is used for representing and searching the value of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmitting interference angle range, the number of interference beam forming vectors, the number of antennas required for transmitting and the like.
Specifically, the value of the transmission interference angle range is recorded as delta, the value of the number of interference beam forming vectors is recorded as M, the value of the number of antennas required for transmission is recorded as N, and the values of a group of signal processing parameters are required to satisfy the following conditions:
Wherein delta theta is the angle and adopts interval.
The size of the transmission interference angle range is used for determining the angle range of the transmission interference; the number of interference beam forming vectors is used for determining the interference dimension, and the increase of the interference dimension can improve the system reachable safety rate under the condition that a plurality of eavesdroppers exist.
In particular, the value of the number of interference beam forming vectors can include zero; the magnitude of the transmitting interference angle range and the number of the interference beam forming vectors are zero or are partially zero, which represent the condition that only transmitting signals do not transmit interference.
The transmitting end transmits at least one of the following: 1) A signal containing reference information and rank index vector information determined based on own antenna configuration; 2) Only the signal containing the rank index vector information determined based on the own antenna configuration and the downlink pilot signal.
Wherein, the antenna configuration of the transmitting terminal at least comprises the number of antennas; the transmitting end judges whether each grade index in the security grade parameter list is supported or not based on the number of the antennas of the transmitting end; the grade index vector is composed of all grade indexes supported by a transmitting end.
Specifically, under the single user condition, the number of antennas of the transmitting end is greater than or equal to the value of the number of antennas required for transmitting in the signal processing parameter represented by one grade index, and the transmitting end supports the grade index.
The receiving end receives the signal transmitted by the transmitting end and comprises at least one of the following steps: 1) A signal containing reference information and rank index vector information determined by the transmitting end based on the antenna configuration; 2) Only the signal containing the rank index vector information determined by the transmitting end based on the antenna configuration and the downlink pilot signal.
The receiving end feeds back the downlink channel information obtained by channel estimation and a grade index selected based on the current service type to the transmitting end; and when the grade index vector does not contain the grade index meeting the current service type requirement of the receiving end, the receiving end feeds back service termination information to the transmitting end.
The downlink channel information comprises a downlink channel gain vector obtained after a receiving end receives a downlink pilot signal transmitted by the transmitting end and carries out channel estimation, and an azimuth angle range where the receiving end is positioned; and recording the azimuth angle range of the receiving end as a first angle range.
In this embodiment, the receiving end selects one level index from the level index vectors provided by the transmitting end according to the current service type, and feeds back the level index to the transmitting end.
The transmitting end receives the downlink channel information fed back by the receiving end and a selected grade index, and determines signal processing parameters according to the grade index selected by the receiving end.
Specifically, the transmitting end determines the signal processing parameters according to a grade index selected by the receiving end, that is, determines the values of the size of the transmitting interference angle range, the number of interference beam forming vectors and the like corresponding to the grade index by searching the security grade parameter table.
The transmitting end calculates and obtains a first beam forming parameter and a second beam forming parameter according to the signal processing parameter and the downlink channel information.
In this embodiment, the transmitting end calculates the first beamforming parameter according to the downlink channel information.
Specifically, a first beam forming parameter is calculated according to a linear constraint minimization variance criterion, wherein the signal power received by a receiving end is taken as a linear constraint with a first power threshold value or more, and the total power of signals in a second angle range is minimized; the first beamforming parameter is an optimal beamforming vector under a linear constraint minimization variance criterion.
The first power threshold is a receiving power threshold determined according to the QoS requirement of a receiving end; the second angular range is the angular range of signal leakage obtained by removing the first angular range from the set of angles [0, pi ].
Specifically, the first beam parameter is obtained by the following calculation: calculating a numerical integralCalculating the first beamforming vector
Wherein w b is a first beamforming parameter; a (θ) is a guide vector in the form of a (θ) = [1, e -jπcos(θ),...,e-jπ(N-1)cos(θ) ]; omega is the second angular range; h b is a first channel parameter; gamma B is the first power threshold.
In this embodiment, the transmitting end calculates the second beam forming parameter according to the signal processing parameter, which may include all or one of the following cases:
Case one: when the transmission interference angle range and the number of interference beam forming vectors contained in the signal processing parameters are zero or both zero, setting the second beam forming parameters to zero, namely only transmitting signals;
And a second case: when the transmission interference angle range and the number of interference beam forming vectors contained in the signal processing parameters are not zero, calculating a second beam forming parameter, and specifically:
and the transmitting end determines the angle range of the transmitting interference according to the magnitude of the angle range of the transmitting interference in the signal processing parameters, and records the angle range of the transmitting interference as a third angle range.
Specifically, it is noted that the first angular range is [ θ l,θh ], and the magnitude of the emission interference angular range is Δ, whereby it is available that the third angular range may be expressed as [ θ l-Δ/2,θh +Δ/2].
It should be noted that, the leakage power of the signal decreases with the deviation from the first angle range, so that interference is emitted only in the area with larger leakage power of the signal at both sides of the first angle range, i.e. the third angle range, instead of omni-directional emission, so as to reduce interference to the simultaneous frequency user and ensure a certain multiplexing capability.
And recording the number of interference beam forming vectors in the signal processing parameters as M, and dividing the third angle range into M angle sections.
Specifically, the M angle intervals, any two angle intervals are mutually disjoint, and the aggregate of all the angle intervals is a third angle range, which can be expressed as follows:
ΩAN,i∩ΩAN,j,i1j,i,j＝1,2,...,M
Wherein the M angular intervals are Ω AN,j, j=1, 2, & gt, M, respectively.
In particular, for convenience of description, the angle range remaining after the jth angle interval Ω AN,j is removed in the third angle range is described asCan be expressed as:
in this embodiment, calculating M interference beamforming vectors included in the second beamforming parameters includes:
taking the jth interference beamforming vector as an example, the following conditions should be satisfied:
Condition one: the maximum value of the signal leakage power to interference power ratio in the third angular range is minimized.
Specifically, for any angle θ belonging to the third angle range, the ratio of the signal leakage power to the interference power can be expressed asThe minimization of the maximum problem can be expressed as
Condition II: the j-th interference beam forming vector does not interfere with the receiving end, namely, the interference power received by the receiving end is ensured to be smaller than or equal to a second power threshold value.
In particular, the interference power received by the receiving end can be expressed asIn order to meet the requirement that the jth interference beam forming vector does not interfere with the receiving end, namely, ensure that the interference power received by the receiving end is smaller than or equal to a second power threshold, the following formula is obtained:
Where w a,j, j=1, 2,..m is the j-th interference beamforming vector, h b is the first channel parameter, h is the second power threshold, which is preferably zero. In this embodiment, the second power threshold is selected to be zero, i.e., the constraint may be expressed as
And (3) a third condition: the jth interference beam forming vector ensures that the interference power of each angle in the jth angle interval is larger than the average interference power of other angle intervals, and the jth interference beam forming vector comprises:
specifically, the interference power at each angle in the jth angle interval can be expressed as
The average interference power of other angle intervals can be expressed as
Wherein the other angle interval is the angle range remaining after the jth angle interval omega AN,j is removed from the third angle range, i.e
To satisfy that the interference power at each angle in the jth angle interval is greater than the average interference power of the other angle intervals, the following power inequality constraint is satisfied:
Specifically, the power of each angle in the corresponding angle interval Ω AN,j is equal to or greater than other transmit interference angles T (T is more than or equal to 1) times of the average power, the following formula is obtained:
In this embodiment, t=m-1 is taken.
Condition four: the total power of the first beam forming parameter and the second beam forming parameter should be less than or equal to the third power threshold, i.e. the following inequality constraint is satisfied:
Wherein the power of the first beam forming parameter is ||w b||2; the power of the second beam forming parameter is P t is the third power threshold.
In this embodiment, the M interference beamforming vectors in the second beamforming parameter have the same interference power, and the inequality constraint may be expressed as:
It should be noted that, under the condition that w a,j satisfies that the corresponding angle interval covers enough interference power, w a,j is ensured to be within the minimum third angle range There is a certain power distribution. The second beamforming parameter, i.e. the M interference beamforming vectors, has M-dimensional random interference at each angle within the third angular range.
Specifically, the jth interference beamforming vector is solved, i.e.,:
Introducing a relaxation variable L, uniformly sampling in an omega AN、ΩAN,j section at an angle sampling interval of delta theta, and converting the problems into L j、Nj sampling points:
Wherein,
The optimization problem is solved by an Internal Convex Approximation (ICA) iterative method according to first-order raised strip piecesConverting the non-convex strip into convex conditions:
Wherein R is the real part, and w a,j,l-1 is the result of the first-1 step. Substituting the above into the optimization problem to obtain the convex problem of the iteration of the first step-1:
θp∈ΩAN,j,p＝1,2,...,Nj
θi∈ΩAN,i＝1,2,...,Lj
In the first +1 iteration, w a,j,l-1 is updated to the result w a,j of the first iteration.
Substituting the initial value into the internal convex approximation method for iterative solution until the result converges or the maximum iteration number is reached, and obtaining the j interference beam forming vector w a,j.
And respectively calculating M interference beam forming vectors by adopting an internal convex approximation iteration method to obtain second beam forming parameters.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal.
In the scheme, the first beam forming parameter carries out weighting processing on the transmitting signal to obtain a first weighted signal; the transmitting end generates M groups of random sequences, and the M groups of random sequences are respectively weighted by M interference beam forming vectors contained in the second beam forming parameters to obtain second weighted signals; and superposing the first weighted signal and the second weighted signal to obtain a processed transmitting signal.
Specifically, the processed transmit signal may be expressed as:
Wherein x is the processed emission signal; w b is a first beamforming parameter, A conjugate vector of w b; w a,j, j=1, 2,..m is the M interference beamforming vectors that constitute the second beamforming parameter,A conjugate vector of w a,j; n a,j, j=1, 2, M is M groups of random interference sequences.
Example 3:
The embodiment of the application provides a signal processing method, which comprises the following steps of:
the transmitting end and the receiving end are preset with the same security level parameter table, and the security level parameter table comprises a level index and signal processing parameters.
Wherein, the grade index is used for representing and searching the value of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmitting interference angle range, the number of interference beam forming vectors, the number of antennas required for transmitting and the like.
The receiving end determines and transmits the required level index information to the transmitting end based on the current service type.
Wherein, the required grade index information at least comprises one or more grade indexes meeting the current service requirement; when a plurality of level indexes are included, the plurality of level indexes may be arranged in a corresponding priority order, or the priority corresponding to the plurality of level indexes may be included in the level index information.
The transmitting end receives the grade index information required by the receiving end, selects one grade index based on the antenna configuration of the transmitting end, and transmits signals to the receiving end, wherein the grade index information comprises at least one of the following components: 1) A signal containing one level index information and reference information selected by the transmitting end; 2) Downlink pilot signals. And feeding back service termination information to the receiving end under the condition of no support level index.
Specifically, the transmitting end selects the rank index based on the self antenna configuration, including: the transmitting end judges whether one or more grade indexes contained in grade index information required by the receiving end are supported or not; then, among the supported rank indexes, one rank index having the highest priority is selected.
Under the condition of single user, the transmitting end supports a certain level index, namely the number of the antennas of the transmitting end is larger than or equal to the value of the number of the antennas required for transmitting in the signal processing parameters represented by the level index.
In particular, service termination information is fed back to the receiving end without supporting the level index. After the receiving end receives the service termination information, the receiving end can request to other transmitting ends.
The receiving end receives the signal transmitted by the transmitting end and comprises at least one of the following steps: 1) A signal containing one level index information and reference information selected by the transmitting end; 2) Downlink pilot signals.
The receiving end feeds back to the transmitting end to obtain the downlink channel information through channel estimation.
The downlink channel information includes a downlink channel gain vector and an azimuth angle range of the receiving end.
The transmitting end receives the downlink channel information fed back by the receiving end and determines signal processing parameters according to the selected one grade index.
Specifically, the transmitting end determines the signal processing parameters according to the selected one level index, that is, determines the values of the size of the transmitting interference angle range, the number of interference beam forming vectors and the like corresponding to the level index by searching the security level parameter table.
The transmitting end calculates and obtains a first beam forming parameter and a second beam forming parameter according to the signal processing parameter and the downlink channel information. Specifically, as shown in the first embodiment.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal. Specifically, as shown in the first embodiment.
Example 4:
The embodiment of the application provides a signal processing method, which comprises the following steps of:
The receiving end determines the transmitting parameter information according to the current service type and transmits the required transmitting parameter information to the transmitting end.
Wherein the transmission parameter information at least comprises one or more groups of transmission parameters; the transmitting parameters at least comprise the size of the transmitting interference angle range, the number of interference beam forming vectors, the number of antennas required for transmitting and the like. When multiple sets of transmission parameters are included, the transmission parameters may be arranged according to the priority order of the transmission parameters, or the transmission parameter information includes priorities corresponding to the transmission parameters.
The transmitting terminal receives the transmitting parameter information required by the receiving terminal, selects a group of transmitting parameters based on the self antenna configuration, and transmits signals to the receiving terminal, wherein the transmitting terminal comprises at least one of the following components: 1) Signals containing a group of transmitting parameter information and reference information selected by the transmitting end; 2) Downlink pilot signals.
And the receiving end feeds back service termination information to the receiving end under the condition of no supporting transmitting parameters.
Specifically, the transmitting end selects a set of transmitting parameters based on the self antenna configuration, including: the transmitting terminal judges whether one or more groups of transmitting parameters contained in the transmitting parameter information are supported or not; then, among the supported one or more sets of transmission parameters, a set of transmission parameters having the highest priority is selected.
Under the condition of single user, the transmitting end supports a certain group of transmitting parameters, namely the number of the transmitting end antennas is larger than or equal to the value of the number of the antennas required by the transmission contained in the group of transmitting parameters.
In particular, service termination information is fed back to the receiving end without supporting transmission parameters. After the receiving end receives the service termination information, communication may be requested from other transmitting ends.
The receiving end receives the signal transmitted by the transmitting end and comprises at least one of the following steps: 1) Signals containing a group of transmitting parameter information and reference information selected by the transmitting end; 2) Downlink pilot signals.
The receiving end feeds back to the transmitting end to obtain the downlink channel information through channel estimation.
The downlink channel information at least comprises a downlink channel gain vector, an azimuth angle range of the receiving end and the like.
The transmitting end receives the downlink channel information fed back by the receiving end, and calculates and obtains a first beam forming parameter and a second beam forming parameter according to the downlink channel information and the transmitting parameter required by the receiving end. Specifically, as shown in the first embodiment.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal. Specifically, as shown in the first embodiment.
Example 5:
The embodiment of the application provides a signal processing method, which comprises the following steps of:
The transmitting end transmits at least one of the following: 1) Signals containing reference information and own antenna configuration information; 2) Only the signal containing the own antenna configuration information and the downlink pilot signal.
The self antenna configuration information at least comprises the number of transmitting end antennas and the like.
The receiving end receives the signal transmitted by the transmitting end and comprises at least one of the following steps: 1) Signals containing reference information and transmitting end antenna configuration information; 2) Only the signal containing the transmitting end antenna configuration information and the downlink pilot signal.
And the receiving end determines a group of required transmitting parameters according to the transmitting end antenna configuration information and the current service type, and feeds back the group of transmitting parameters and downlink channel information obtained through channel estimation to the transmitting end.
The transmitting parameters at least comprise the size of a transmitting interference angle range, the number of interference beam forming vectors and the like; the downlink channel information at least comprises a downlink channel gain vector, an azimuth angle range of the receiving end and the like.
The transmitting end receives the downlink channel information fed back by the receiving end and the transmitting parameters required by the receiving end, and calculates and obtains the first beam forming parameters and the second beam forming parameters. Specifically, as shown in the first embodiment.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal. Specifically, as shown in the first embodiment.
Example 6:
the embodiment of the application provides a signal processing method, which comprises the following steps of:
The transmitting end and the plurality of receiving ends are preset with the same security level parameter table, and the security level parameter table comprises level indexes and signal processing parameters.
Wherein, the grade index is used for representing and searching the value of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmitting interference angle range, the number of interference beam forming vectors, the number of antennas required for transmitting and the like.
The transmitting end transmits at least one of the following: 1) A signal containing reference information and rank index vector information determined based on own antenna configuration; 2) Only the signal containing the rank index vector information determined based on the own antenna configuration and the downlink pilot signal.
Wherein, the antenna configuration of the transmitting terminal at least comprises the number of antennas; the transmitting end judges whether each grade index in the security grade parameter list is supported or not based on the number of the antennas of the transmitting end; the grade index vector is composed of all grade indexes supported by a transmitting end.
The plurality of receiving terminals receive the signals transmitted by the transmitting terminal, and the signals comprise at least one of the following: 1) A signal comprising reference information and rank index vector information determined based on a transmitting-side antenna configuration; 2) Only the signal containing the rank index vector information determined based on the transmitting-end antenna configuration and the downlink pilot signal.
And the plurality of receiving ends feed back the downlink channel information obtained through channel estimation and the required level index information determined based on the current service type selection to the transmitting end.
The downlink channel information at least comprises a downlink channel gain vector, an azimuth angle range of the receiving end and the like; the grade index information at least comprises one or more grade indexes in a grade index vector provided by a selective transmitting end according to the current service type. When a plurality of level indexes are included, the plurality of level indexes may be arranged in a corresponding priority order, or the priority corresponding to the plurality of level indexes may be included in the level index information.
It should be noted that, the one or more class indexes determined by the plurality of users according to the respective current service types may be identical, partially identical or completely different.
The transmitting end receives the downlink channel information and the required grade index information fed back by the plurality of receiving ends, and selects an accessible receiving end and a corresponding grade index.
It should be noted that, in the multi-user situation, the transmitting end needs to jointly schedule multiple receiving ends, and select the accessible receiving end and a corresponding level index.
Specifically, the transmitting end selects a plurality of receiving ends using different airspace resources as accessible receiving ends according to downlink channel information fed back by the plurality of receiving ends and the required level index information. Wherein, the accessible receiving terminals using different airspace resources all need to satisfy: for an accessible receiving end, one or more grade indexes exist in the required grade index information determined by the receiving end, and the transmitting parameters represented by the grade indexes and the azimuth angle range of the receiving end meet that the azimuth angle range of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends; the angle range of the transmitting interference of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends. For an accessible receiving end, if a plurality of grade indexes meeting the conditions exist in the needed grade index information determined by the receiving end, selecting one grade index with highest priority.
For multiple accessible receivers using different spatial resources, it is possible to use completely identical, partially identical or completely different time, frequency or code domain resources.
In addition, for the user occupying the same space domain resource, the transmitting end may reallocate a part of the same or completely different time domain, frequency domain or code domain resource, which is described in the fifth embodiment. Under the condition that the resources of the transmitting end are saturated, the transmitting end feeds back service termination information to the receiving end; the receiving end may request communication from other transmitting ends after receiving the service termination information.
The transmitting end determines signal processing parameters according to the corresponding grade indexes of each access receiving end, and calculates and obtains first beam forming parameters and second beam forming parameters of each access receiving end according to the signal processing parameters and downlink channel information. Specifically, as shown in the first embodiment.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal. Specifically, as shown in the first embodiment.
Example 7:
the embodiment of the application provides a signal processing method, which comprises the following steps of:
The transmitting end transmits at least one of the following: 1) Signals containing reference information and own antenna configuration information; 2) Only the signal containing the own antenna configuration information and the downlink pilot signal.
The transmitting terminal self-antenna configuration information at least comprises the number of antennas.
The plurality of receiving terminals receive the signals transmitted by the transmitting terminal, and the signals comprise at least one of the following: 1) Signals containing reference information and transmitting end antenna configuration information; 2) Only the signal containing the transmitting end antenna configuration information and the downlink pilot signal.
And the plurality of receiving ends feed back the downlink channel information obtained by the receiving ends through channel estimation and the needed transmitting parameter information determined based on the current service type selection to the transmitting ends.
The downlink channel information at least comprises a downlink channel gain vector and an azimuth angle range of the receiving end; the transmission parameter information is as described in embodiment three.
It should be noted that, the one or more sets of transmission parameters determined by the plurality of users according to the respective current service types may be identical, partially identical or completely different.
The transmitting end receives the downlink channel information and the required transmitting parameter information fed back by the plurality of receiving ends, and selects an accessible receiving end and a corresponding group of transmitting parameters.
It should be noted that, in the multi-user situation, the transmitting end needs to jointly schedule multiple receiving ends, and select the accessible receiving ends and a corresponding set of transmitting parameters.
Specifically, the transmitting end selects a plurality of receiving ends using different airspace resources as accessible receiving ends according to downlink channel information fed back by the plurality of receiving ends and required transmitting parameter information. Wherein, the accessible receiving terminals using different airspace resources all need to satisfy: for an accessible receiving end, one or more groups of transmitting parameters exist in the required transmitting parameter information determined by the receiving end, and the azimuth angle range of the transmitting parameter and the receiving end meets the condition that the azimuth angle range of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends; the angle range of the transmitting interference of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends. For an accessible receiving end, if a plurality of groups of transmission parameters meeting the conditions exist in the needed transmission parameter information determined by the receiving end, selecting a group of transmission parameters with highest priority.
For multiple accessible receivers using different spatial resources, it is possible to use completely identical, partially identical or completely different time, frequency or code domain resources.
In addition, for the user occupying the same space domain resource, the transmitting end may reallocate a part of the same or completely different time domain, frequency domain or code domain resource, which is described in the following embodiment as embodiment six. Under the condition that the resources of the transmitting end are saturated, the transmitting end feeds back service termination information to the receiving end; the receiving end may request communication from other transmitting ends after receiving the service termination information.
The transmitting end calculates and obtains a first beam forming parameter and a second beam forming parameter of each access receiving end according to a group of transmitting parameters and downlink channel information corresponding to each access receiving end. Specifically, as shown in the first embodiment.
The transmitting end processes the signal to be transmitted by adopting the first beam forming parameter and the second beam forming parameter, and obtains the processed transmitting signal. Specifically, as shown in the first embodiment.
Example 8:
In embodiments 2 to 5, in the case of a single user, the manner of acquiring the angular range size of the transmission interference, the number of interference beam forming vectors, and the like includes one of the following: 1) Determining according to feedback information of a receiving end; 2) The transmitting end is self-configured. When the transmitting end configures the parameters by itself, the angle range of the transmitting interference should be satisfied and the angle range of the receiving end should not overlap each other.
Example 9
In embodiments 6 to 7, in the case of multiple users, the manner of acquiring the angular range size of the transmission interference, the number of interference beam forming vectors, and the like includes one of the following: 1) Determining according to feedback information of a receiving end; 2) The transmitting end is self-configured. When the transmitting end configures the parameters by itself, it should be satisfied that the angle range of the transmitting interference of each receiving end and the angle range of the receiving end are not overlapped with each other for multiple users with the same time domain, frequency domain or code domain.
Example 10
For embodiments 2 to 9, wherein the transmitting end may be one of a base station side equipped with multiple antennas or a user side equipped with multiple antennas; the receiving end may be one of a base station side or a user side.
The following is an example of the transmit signal processing procedure at the transmitting end with reference to fig. 2-5:
The preset security level parameter tables of the transmitting end and the receiving end are shown in the following table:
| hierarchical index | Size of transmit interference angle range | Number of interference beamforming vectors | Number of antennas required for transmission |
| 5 | 60° | 10 | 128 |
| 4 | 50° | 8 | 64 |
| 3 | 40° | 6 | 64 |
| 2 | 30° | 4 | 48 |
| 1 | 0° | 0 | 48 |
In the table, the level index 1 indicates that the magnitude of the transmission interference angle range and the number of interference beam forming vectors are zero, and the transmission signal does not transmit interference.
Assuming that the number of antennas N required for the transmitting end is 64, the rank index vector can be determined as [1,2,3,4] according to the parameters in the above table. And transmitting the grade index vector of [1,2,3,4] and the downlink pilot signals to a receiving end. It should be noted that, the transmitting end transmits at least one of the following: 1) A signal containing reference information and rank index vector information determined based on own antenna configuration; 2) Only the signal containing the rank index vector information determined based on the own antenna configuration and the downlink pilot signal.
After receiving the downlink pilot signal transmitted by the transmitting end, the receiving end carries out channel estimation, the obtained downlink channel gain vector is h b, and the first angle range is [ theta l,θh ] = [87.5 degrees, 92.5 degrees ]. The current business has higher requirements on security, and the level index 3 in the level index vectors [1,2,3,4] is selected as the security level.
The grade index selected by the receiving end is 3, the size delta=40° of the transmitting interference angle range can be obtained by searching the table, and the number M=6 of interference wave beam forming vectors.
The transmitting end calculates a first beam forming parameter according to the downlink channel information, and calculates a second beam forming parameter according to the transmitting signal parameter. Wherein the first power threshold may be set to γ B =30 dBm, the second angle range may be set to Ω= [0,87.5 ° ] u [92.5 °,180 ° ], the third angle range is [67.5 °,112.5 ° ], and the third power threshold is P t =35 dBm.
And finally, the transmitting end processes the transmitting signal according to the first beam forming parameter and the second beam forming parameter to obtain a processed transmitting signal.
Fig. 2 is a schematic diagram of directional structures of a first beam forming vector and a second beam forming vector, wherein a solid line in the diagram is a power distribution of a signal, and six dotted lines are power distributions of six independent interferences respectively. As can be seen, the first beamforming vector concentrates the signal power in the first angular range, minimizing the signal leakage power in the second angular range; the six interference beams included in the second beam forming vector respectively correspond to one sub-angle interval, and maintain a certain power distribution in other angle intervals.
It should be emphasized here that the division of the third angle interval makes the interference power concentrate in the angle area with larger signal leakage, but not omnidirectionally transmit the interference, so that the embodiment can be applied to a multi-cell scene, and the interference to the neighboring cells is reduced; the case where the number of interference beamforming vectors M >1, gives the system the ability to combat multiple eavesdroppers.
The following section analyzes the ability of the present embodiment to combat multiple eavesdroppers.
Fig. 3 is a schematic diagram showing the influence of the number of independent interference on the system capacity under different numbers of eavesdroppers in the case that the eavesdroppers process the received signal alone.
Specifically, the signal received by the legal receiving end isThe signal received by the eavesdropper is
Wherein y b is a legal receiving end receiving signal; y e,k is the received signal of the illegal eavesdropper, K is the total number of the illegal eavesdroppers; n b is legal receiving end additive Gaussian interference; n e,k, k=1, 2..k is the kth illegal eavesdropper receiving end additive gaussian interference; h 0 is a channel parameter vector between the base station and a legal receiving end; h k, k=1, 2.
From this, the legal receiving end, the received signal-to-noise ratio of each eavesdropper and the security capacity of the system can be calculated, which can be expressed as
Where SINR B is the received signal-to-noise ratio of the legitimate receiving end and SINR e,k is the received signal-to-noise ratio of the kth eavesdropper.
As can be seen from fig. 3, the system security rate decreases with the increase of eavesdroppers, but by comparing the change situations of the security rate under different M, the decrease of the security rate is very slow in the case of multiple interference (m=6, 8), and the security rate has a certain capability of resisting multiple eavesdroppers; on the other hand, comparing the two cases of m=6 and 8, it can be seen that the increase of the number of interferences can further increase the security rate of the system and enhance the resistance to multiple eavesdroppers.
Fig. 4 is a schematic diagram of the impact of the number of eavesdroppers on the system security capacity at different numbers of interference in the case where multiple eavesdroppers are jointly processing the received signal.
Specifically, an eavesdropper employs an MMSE receiver to jointly process the received signal, which can be expressed as:
yE＝hEs+nE
＝hEs+Hnna+n
Specifically, y E＝[yE,1,yE,2,...,yE,K]T, an artificial interference vector n a＝[na,1,na,2,...,na,M]T, and an interference vector n= [ n e,1,ne,2,...,ne,K]T.nE＝Hnna +n are equivalent interference accepted. H E and H n are equivalent channels of signal and artificial interference respectively, and the forms are as follows:
the MMSE receiver can be expressed as:
Thus, for an eavesdropper colluding the processed signal, the received signal is:
Wherein, Is the covariance matrix of the equivalent interference. The SINR (Signal to Interference plus Noise Ratio ) of an eavesdropper can be expressed as
From this, the performance of the multi-eavesdropper in jointly processing the received signal by the MMSE receiver is analyzed.
As can be seen from fig. 4, in a system where a joint eavesdropper exists, the achievable safe rates are significantly higher in the case of m=4, 8 than in the case of m=0; further, the more interference there is, the slower the system safety rate decreases as K increases; when K is larger, the interference number is obvious to the improvement of the system safety rate. It is thus obtained that the number of interference beamforming vectors has the ability to resist joint eavesdroppers.
Fig. 5 is a schematic diagram of the algorithm convergence speed for calculating the second beam forming parameter, and as can be seen from the figure, the algorithm convergence is very fast, and the algorithm can converge to the final value in three steps or so.
According to the signal processing method, the signal is sent by determining the transmitted signal parameters and utilizing the determined transmitted signal parameters; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in an angle area with higher signal leakage power, so that adjacent area interference caused by omni-directional occurrence is avoided; random interference of multiple dimensions is transmitted in the signal leakage area to combat the existence of multiple eavesdroppers, and the security threat of multiple eavesdroppers to the wireless system is effectively reduced.
Example 11
As shown in fig. 6, an embodiment of the present application provides a signal processing apparatus, including: a memory 21, a processor 22 and a signal processing program stored on the memory 21 and executable on the processor 22, which when executed by the processor 22 is for realizing the steps of the signal processing method described in embodiment 1.
It should be noted that, the signal processing apparatus of the present embodiment belongs to the same concept as the method of embodiment 1, the specific implementation process of the signal processing apparatus is detailed in the method embodiment, and the technical features of the method embodiment are correspondingly applicable in the present embodiment, which is not described herein again.
The signal processing device of the embodiment of the application carries out signal transmission by determining the transmitted signal parameters and utilizing the determined transmitted signal parameters; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in an angle area with higher signal leakage power, so that adjacent area interference caused by omni-directional occurrence is avoided; random interference of multiple dimensions is transmitted in the signal leakage area to combat the existence of multiple eavesdroppers, and the security threat of multiple eavesdroppers to the wireless system is effectively reduced.
Example 12
An embodiment of the present application provides a computer-readable storage medium having stored thereon a signal processing program for implementing the steps of the signal processing method described in embodiment 1 when the signal processing program is executed by a processor.
It should be noted that, the computer readable storage medium of the present embodiment belongs to the same concept as the method of embodiment 1, the specific implementation process of the computer readable storage medium is detailed in the method embodiment, and the technical features of the method embodiment are correspondingly applicable in the present embodiment, which is not repeated herein.
The computer readable storage medium of the embodiment of the application performs signal transmission by determining the transmission signal parameters and utilizing the determined transmission signal parameters; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in an angle area with higher signal leakage power, so that adjacent area interference caused by omni-directional occurrence is avoided; random interference of multiple dimensions is transmitted in the signal leakage area to combat the existence of multiple eavesdroppers, and the security threat of multiple eavesdroppers to the wireless system is effectively reduced.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present application shall fall within the scope of the appended claims.
Claims (9)
1. A method of signal processing, the method comprising:
the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine the transmitting signal parameter and/or perform signal transmission;
the transmitting end transmits at least one of the security level index and the security level parameter information to the receiving end to determine the transmitting signal parameter and/or to transmit signals;
The transmitting end determines transmitting signal parameters according to at least one of the security level index, the security level parameter information and the channel information and/or transmits signals;
the transmitting end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine a transmitting signal parameter, and the transmitting signal parameter comprises at least one of the following steps:
The transmitting end selects t security level indexes from the information fed back by the receiving end to determine transmitting signal parameters; wherein t is a positive integer greater than or equal to 1;
The transmitting end determines transmitting signal parameters according to the security level indexes fed back by the plurality of receiving ends;
The transmitting end determines the transmitting signal parameters according to the security level indexes fed back by the plurality of receiving ends, and the transmitting signal parameters comprise at least one of the following:
the transmitting end transmits a grade index vector to the plurality of receiving ends;
the sending end receives the needed grade index information fed back by the plurality of receiving ends, selects one or more receiving ends from the grade index information, and/or the safety grade index corresponding to the receiving ends;
Wherein the transmit signal parameters include: the size of the transmitting interference angle range, the number of interference beam forming vectors and the number of antennas required for transmitting; the channel information at least comprises an azimuth angle range in which the receiving end is positioned;
the signal comprises an interference signal, and the transmitting end determines an angle range for transmitting the interference signal based on the size of the transmitting interference angle range and the azimuth angle range of the receiving end.
2. The method of claim 1, wherein the transmitting end selects a security level index from the information fed back by the receiving end to determine the transmission signal parameter, and the method comprises at least one of the following steps:
The receiving end transmits N security level indexes to the transmitting end; the transmitting end selects t security level indexes from N security level indexes fed back by the receiving end; wherein N is a positive integer greater than or equal to 1, t < = N.
3. The method of claim 1, wherein after the transmitting end receives at least one of the security level index, the security level parameter information, and the channel information fed back by the receiving end, the method further comprises:
Feeding back service termination information to the receiving end under the condition that the security level index fed back by the receiving end does not have the level index supported by the sending end; or transmitting or feeding back a parameter corresponding to the security level close to the security level of the receiving end to determine a transmitting signal and transmitting the transmitting signal; and/or notifying the receiving end of a current security level index; or determining and transmitting a transmitting signal according to the parameters corresponding to the default security level.
4. The method of claim 1, wherein the transmitting end receives the required level index information fed back by the plurality of receiving ends, and further comprising:
Under the condition that the resources of the transmitting end are saturated, the transmitting end feeds back service termination information to the plurality of receiving ends; or alternatively
Only a portion of the plurality of receiving ends are served, and signaling is performed based on the security level information fed back by the receiving ends and/or the supportable security level capabilities of the transmitting ends.
5. The method of claim 1, wherein the transmitting the at least one of the security level index and the security level parameter information to the receiving end by the transmitting end determines the transmission signal parameter, comprises at least one of:
the receiving end feeds back channel information obtained through channel estimation to the transmitting end;
the receiving end feeds back one or more grade indexes selected based on the current service type to the transmitting end;
the receiving end feeds back the required grade index information determined based on the current service type to the transmitting end.
6. The method of claim 5, wherein the receiving end feeds back to the transmitting end one or more class indexes selected based on the current traffic type, comprising at least one of:
the transmitting end transmits N grade index vectors to the receiving end;
and the receiving end selects one or more grade indexes from the N grade index vectors according to the service type, wherein N is a positive integer greater than or equal to 1.
7. The method of claim 6, wherein the method further comprises:
The receiving end feeds back service termination information to the transmitting end under the condition that no grade index required by the service type exists in the N grade index vectors; or transmitting or feeding back a parameter corresponding to the security level close to the security level of the receiving end to determine a transmitting signal and transmitting the transmitting signal; and/or notifying the receiving end of a current security level index; or determining and transmitting a transmitting signal according to the parameters corresponding to the default security level.
8. A signal processing device comprising a memory, a processor and a signal processing program stored on the memory and executable on the processor, the signal processing program when executed by the processor implementing the steps of the signal processing method according to any one of claims 1 to 7.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a signal processing program which, when executed by a processor, implements the steps of the signal processing method according to any of claims 1 to 7.
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| KR20060005681A (en) * | 2004-07-13 | 2006-01-18 | 삼성전자주식회사 | Data transmission method for multiuser mimo communication system |
| CN103155507A (en) * | 2010-08-13 | 2013-06-12 | 美国日本电气实验室公司 | Feed-forward control signaling and decoding schemes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20060005681A (en) * | 2004-07-13 | 2006-01-18 | 삼성전자주식회사 | Data transmission method for multiuser mimo communication system |
| CN103155507A (en) * | 2010-08-13 | 2013-06-12 | 美国日本电气实验室公司 | Feed-forward control signaling and decoding schemes |
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