CN117134909B - Decorrelation channel key generation method, device, communication equipment and storage medium - Google Patents
Decorrelation channel key generation method, device, communication equipment and storage medium Download PDFInfo
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Abstract
The invention provides a decorrelated channel key generation method, a device, communication equipment and a storage medium, and relates to the technical field of information security, wherein the method comprises the following steps: acquiring initial channel state information; performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient; according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient; carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient; a channel key is generated based on the discrete cosine transform coefficients. The invention can remove the intra-frame relativity of the initial channel state information and can improve the safety of the channel key.
Description
Technical Field
The present invention relates to the field of information security technologies, and in particular, to a method and apparatus for generating a decorrelated channel key, a communication device, and a storage medium.
Background
Because of the reciprocity of the uplink and downlink channels, both communication parties can generate a near-identical channel key by extracting the channel state information of the uplink and downlink channels. Therefore, the generation of the key is realized without the traditional password scheme, and the safety communication between the two communication parties is further realized. The channel key can be used as an effective supplement of the traditional secure communication, improves the security level of the whole communication process, and has wide application prospect.
However, due to the influence of the coherence time, there is a high intra-frame correlation of the channel state information extracted by the user. If the key is generated directly from the initial channel state information, the final channel key will have intra-frame correlation, thereby affecting the security of the channel key.
Disclosure of Invention
The invention provides a decorrelated channel key generation method, a device, communication equipment and a storage medium, which are used for solving the defect that the safety of a channel key is affected due to intra-frame correlation existing when the channel key is directly generated through channel state information.
The invention provides a decorrelated channel key generation method, which comprises the following steps:
acquiring initial channel state information;
performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient;
according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient;
carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient;
a channel key is generated based on the discrete cosine transform coefficient.
According to the method for generating a decorrelated channel key provided by the present invention, the discrete cosine transform processing is performed on the initial channel state information to obtain a first discrete cosine transform coefficient, which includes:
denoising the initial channel state information to obtain first frequency domain channel state information;
and performing discrete cosine transform processing on the first frequency domain channel state information to obtain the first discrete cosine transform coefficient.
According to the method for generating the decorrelated channel key provided by the invention, the denoising processing is performed on the initial channel state information to obtain the first frequency domain channel state information, which comprises the following steps:
performing inverse fast fourier transform on the initial channel state information to obtain initial time domain channel state information;
denoising the initial time domain channel state information to obtain first time domain channel state information;
and performing fast Fourier transform on the first time domain channel state information to obtain the first frequency domain channel state information.
According to the method for generating the decorrelated channel key provided by the invention, the denoising processing is performed on the initial time domain channel state information to obtain the first time domain channel state information, which comprises the following steps:
setting the time domain coefficient exceeding a preset threshold value in the initial time domain channel state information to zero so as to reduce noise information in the initial time domain channel state information and obtain the first time domain channel state information.
According to the method for generating a decorrelated channel key provided by the present invention, the discrete cosine transform processing is performed on the channel state information of the first frequency domain to obtain the first discrete cosine transform coefficient, which includes:
performing truncation processing on the first frequency domain channel state information to obtain second frequency domain channel state information;
and performing discrete cosine transform processing on the second frequency domain channel state information to obtain the first discrete cosine transform coefficient.
According to the method for generating the decorrelated channel key provided by the invention, the fast fourier transform is performed on the first time domain channel state information to obtain the first frequency domain channel state information, which comprises the following steps:
performing up-sampling processing on the first time domain channel state information to obtain second time domain channel state information;
filtering the second time domain channel state information to obtain third time domain channel state information;
and performing fast Fourier transform on the third time domain channel state information to obtain the first frequency domain channel state information.
According to the method for generating the decorrelated channel key provided by the invention, the filtering processing is performed on the second time domain channel state information to obtain third time domain channel state information, which comprises the following steps:
constructing a sinc function according to the up-sampling length corresponding to the second time domain channel state information;
and obtaining the third time domain channel state information according to the second time domain channel state information and the sinc function.
The invention also provides a device for generating the decorrelated channel key, which comprises the following steps:
the acquisition module is used for acquiring initial channel state information;
the discrete cosine transform module is used for performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient;
the truncation module is used for performing truncation processing on the first discrete cosine transform coefficient according to a preset truncation parameter to obtain a second discrete cosine transform coefficient;
the normalization module is used for carrying out standard deviation normalization on the second discrete cosine transform coefficient segments according to a preset normalization step length to obtain discrete cosine transform coefficients;
and the generation module is used for generating a channel key based on the discrete cosine transform coefficient.
The invention also provides a communication device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the decorrelated channel key generation method as described in any of the above when the program is executed.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the decorrelated channel key generation method as described in any of the above.
The invention provides a decorrelation channel key generation method, a device, communication equipment and a storage medium, wherein initial channel state information is acquired firstly; then, when the initial channel state information has statistical characteristics close to the Markov process, the decorrelation of the discrete cosine transform process is close to the performance of K-L (Karhunen-Loeve) transform, and the K-L transform has optimal decorrelation, and the initial channel state information is subjected to discrete cosine transform process to obtain a first discrete cosine transform coefficient, so that an approximately optimal decorrelation result can be obtained; then, the first discrete cosine transform coefficient is directly quantized to generate a channel key, so that the channel key is largely repeated and has high correlation, the first discrete cosine transform coefficient is truncated according to preset truncation parameters to obtain a second discrete cosine transform coefficient, so that most of effective information of the first discrete cosine transform coefficient can be reserved, and the high correlation of the channel key can be removed; then, standard deviation normalization is carried out on the second discrete cosine transform coefficient segments according to a preset normalization step length to obtain discrete cosine transform coefficients, and consistency of integral distribution of the truncated discrete cosine transform coefficients can be ensured, so that influence of progressive reduction characteristics of the second discrete cosine transform coefficients on integral safety of channel keys is reduced; finally, a channel key is generated based on the discrete cosine transform coefficients. Therefore, the invention can remove the relativity of frames with higher initial channel state information and can improve the safety of the channel key.
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In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a decorrelation channel key generating method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a process for truncating discrete cosine transform coefficients according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a truncation process of the first frequency domain channel state information according to an embodiment of the present invention;
FIG. 4 is a second flowchart of a method for generating a decorrelated channel key according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a decorrelated channel key generating apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, 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.
The decorrelation channel key generation method of the present invention, which can be applied to communication apparatuses of both communication parties, respectively, is described below with reference to fig. 1 to 4.
Referring to fig. 1, fig. 1 is a flowchart of a method for generating a decorrelated channel key according to an embodiment of the present invention. As shown in fig. 1, the method may include the steps of:
step 101, obtaining initial channel state information;
102, performing discrete cosine transform processing on initial channel state information to obtain a first discrete cosine transform coefficient;
step 103, according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient;
104, carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient;
step 105, generating a channel key based on the discrete cosine transform coefficient.
In step 101, after the communication devices of the two communication parties establish a wireless connection, initial channel state information is acquired.
Illustratively, when the method is applied to communication device B, communication device B performs channel sounding based on the pilot signal transmitted by communication device a, with an acquisition length ofIs>。
When the method is applied to the communication equipment A, the communication equipment A performs channel detection based on the pilot signal sent by the communication equipment B, and obtains the length of the channel detectionIs>。
In step 102, since the decorrelation of the discrete cosine transform process is close to the performance of the K-L transform (Karhunen-loeve) when the initial channel state information has the statistical characteristics close to the markov process, and the K-L transform has the optimal decorrelation, the discrete cosine transform process is performed on the initial channel state information to obtain the first discrete cosine transform coefficient, and an approximately optimal decorrelation result can be obtained.
Illustratively, when the method is applied to communication device B, communication device B transmits the initial channel state informationPerforming discrete cosine transform to obtain a first discrete cosine transform coefficient +.>。
When the method is applied to communication device a, communication device a transmits initial channel state informationPerforming discrete cosine transform to obtain a first discrete cosine transform coefficient +.>。
In step 103, since the first discrete cosine transform coefficient is directly quantized to generate the channel key, a large number of repetitions of the channel key may occur, and a high correlation exists, and the first discrete cosine transform coefficient is truncated according to a preset truncation parameter to obtain a second discrete cosine transform coefficient, so that the high correlation of the channel key may be removed.
Also, the discrete cosine transform has a strong "energy concentrating" property, i.e., most of the energy of natural signals (including sound and images) is concentrated in the low frequency part after the discrete cosine transform. The first discrete cosine transform coefficient is truncated according to a preset truncation parameter to obtain a second discrete cosine transform coefficient, and the resource requirement can be obviously reduced while most of effective information is maintained.
Illustratively, as shown in FIG. 2, when the method is applied to communication device B, communication device B is configured to determine the predetermined cutoff parameter based on the predetermined cutoff parameterAnd->For the first discrete cosine transform coefficient +>Performing truncation processing, namely taking only interval +.>Is used to generate a channel key, obtaining a length +.>Second discrete cosine transform coefficient of (2)>。
When the method is applied to the communication equipment A, the communication equipment A is used for cutting off parameters according to the presetAndfor the first discrete cosine transform coefficient +>Performing truncation, i.e. taking only intervals in the coefficient sequenceIs used to generate a channel key, obtaining a length +.>Second discrete cosine transform coefficient of (2)>。
In step 104, standard deviation normalization is performed on the second discrete cosine transform coefficient segment according to the preset normalization step length to obtain a discrete cosine transform coefficient, so that consistency of overall distribution of the truncated discrete cosine transform coefficient can be ensured, and influence of progressive reduction characteristics of the second discrete cosine transform coefficient on overall security of the channel key is reduced.
Illustratively, when the method is applied to communication device B, communication device B normalizes the step size by a preset amountSegmentation of the second discrete cosine transform coefficient +.>Standard deviation normalization is carried out to obtain discrete cosine transform coefficients. Such as->Only the interval of the coefficient sequence is taken>Is used to generate a channel key, obtaining a length +.>Second discrete cosine transform coefficient of (2)>. Segmentation of the second discrete cosine transform coefficient according to a preset normalization step 16 +.>Standard deviation normalization is carried out to obtain discrete cosine transform coefficients。
When the method is applied to the communication equipment A, the communication equipment A performs normalization according to a preset step sizeSegmentation of the second discrete cosine transform coefficient +.>Standard deviation normalization is carried out to obtain discrete cosine transform coefficient +.>. Such asOnly the interval of the coefficient sequence is taken>Is used to generate a channel key, obtaining a length +.>Second discrete cosine transform coefficient of (2)>. Segmentation of the second discrete cosine transform coefficient according to a preset normalization step 16 +.>Standard deviation normalization is carried out to obtain discrete cosine transform coefficient +.>。
In step 105, the discrete cosine transform coefficient may be quantized, tempered error corrected, and privacy amplified to generate a channel key, by way of example, but the embodiment is not limited thereto.
Wherein, the quantization process refers to: each sequence element of the discrete cosine transform coefficient is quantized to obtain a first channel key sequence.
The harmonic error correction process refers to: and carrying out harmonic error correction on the first channel key sequence by adopting a agreed harmonic error correction algorithm and preset parameters to obtain a second channel key sequence with consistent uplink and downlink keys.
The privacy amplification process refers to: in order to reject out information in the second channel key sequence that may be known to an eavesdropper, the resulting channel key is made completely secret to the person other than the party (or, in other words, the resulting channel key is an information-theoretic security key).
The method for generating the decorrelated channel key provided by the embodiment of the invention comprises the steps of firstly, acquiring initial channel state information; then, when the initial channel state information has the statistical characteristic close to the Markov process, the decorrelation of the discrete cosine transform process is close to the performance of the K-L transform, and the K-L transform has the optimal decorrelation, the discrete cosine transform process is carried out on the initial channel state information to obtain a first discrete cosine transform coefficient, and an approximately optimal decorrelation result can be obtained; then, the first discrete cosine transform coefficient is directly quantized to generate a channel key, so that the channel key is largely repeated and has high correlation, the first discrete cosine transform coefficient is truncated according to preset truncation parameters to obtain a second discrete cosine transform coefficient, so that most of effective information of the first discrete cosine transform coefficient can be reserved, and the high correlation of the channel key can be removed; then, standard deviation normalization is carried out on the second discrete cosine transform coefficient segments according to a preset normalization step length to obtain discrete cosine transform coefficients, and consistency of integral distribution of the truncated discrete cosine transform coefficients can be ensured, so that influence of progressive reduction characteristics of the second discrete cosine transform coefficients on integral safety of channel keys is reduced; finally, a channel key is generated based on the discrete cosine transform coefficients. Therefore, the embodiment of the invention can remove the intra-frame correlation with higher initial channel state information and improve the safety of the channel key.
In an example embodiment, step 102 may include the sub-steps of:
step 1021, denoising the initial channel state information to obtain first frequency domain channel state information;
step 1022, performing discrete cosine transform processing on the first frequency domain channel state information to obtain a first discrete cosine transform coefficient.
In step 1021, denoising is performed on the initial channel state information, so that noise in the initial channel state information can be removed, and the first time-frequency domain channel state information is obtained.
In step 1022, since the first frequency domain channel state information is obtained by denoising the initial channel state information, the first frequency domain channel state information is subjected to discrete cosine transform to obtain a first discrete cosine transform coefficient, which can improve the accuracy of the first discrete cosine transform coefficient.
In this embodiment, first, denoising is performed on initial channel state information to obtain first frequency domain channel state information; then, discrete cosine transform processing is carried out on the first frequency domain channel state information to obtain a first discrete cosine transform coefficient, and noise in the initial channel state information can be removed, so that accuracy of the first discrete cosine transform coefficient is improved.
In one possible implementation, step 1021 may include the sub-steps of:
step 10211, performing inverse fast fourier transform on the initial channel state information to obtain initial time domain channel state information;
step 10212, denoising the initial time domain channel state information to obtain first time domain channel state information;
step 10213, performing fast fourier transform on the first time domain channel state information to obtain first frequency domain channel state information.
In step 10211, communication device B illustratively has a pair length ofIs>Performing inverse fast fourier transform to obtain initial channel state informationConverting from frequency domain to time domain to obtain initial time domain channel state information +.>。
When the method is applied to the communication equipment A, the pair length of the communication equipment A is as followsIs>Performing inverse fast fourier transform to obtain initial channel state information +.>Converting from frequency domain to time domain to obtain initial time domain channel state information +.>。
In step 10212, communication device B illustratively, when the method is applied to communication device B, initially initiates a pair ofTime domain channel state informationDenoising to obtain first time domain channel state information +.>The initial time domain channel state information can be reduced +.>Noise in (a) is generated.
When the method is applied to the communication equipment A, the communication equipment A performs initial time domain channel state informationDenoising to obtain first time domain channel state information +.>The initial time domain channel state information can be reduced +.>Noise in (a) is generated.
In step 10213, communication device B illustratively applies the method to the first time domain channel state informationPerforming fast Fourier transform to obtain first time domain channel state information +.>Converting from time domain to frequency domain to obtain first frequency domain channel state information +.>。
When the method is applied to the communication equipment A, the communication equipment A performs channel state information on the first time domainPerforming fast Fourier transform to obtain first time domain channel state information +.>Converting from time domain to frequency domain to obtain first frequency domain channel state information +.>。
In this embodiment, the initial channel state information is converted from the frequency domain to the time domain for denoising, and then from the time domain to the frequency domain, and the denoising is easy to implement in the time domain, so that the denoising difficulty of the initial channel state information can be improved.
In one possible implementation, step 10212 may include: and setting the time domain coefficient exceeding a preset threshold value in the initial time domain channel state information to zero so as to reduce noise information in the initial time domain channel state information and obtain first time domain channel state information.
Specifically, the preset threshold is a time domain tap number threshold agreed by both communication parties.
Illustratively, when the method is applied to communication device B, communication device B thresholds the number of time-domain taps according to the communication environment and the agreed uponSuch as urban microcells, get +.>The initial time domain channel state information +.>Middle is in section->Setting the time-domain coefficient of (2) to zero, i.e. in the interval +.>Is set to zero, can reduce the initial time domain channel state information->Noise information in (1) to obtain a first timeDomain channel state information->。
When the method is applied to the communication equipment A, the communication equipment A is used for judging the threshold value of the number of time domain taps according to the communication environment and the agreed time domain tapsSuch as urban microcells>The initial time domain channel state information +.>Is in the intervalSetting the time-domain coefficient of (2) to zero, i.e. in the interval +.>Is set to zero, can reduce the initial time domain channel state information->Noise information in (1) to obtain first time domain channel state information +.>。
In this embodiment, first, inverse fast fourier transform is performed on the initial channel state information, and the initial channel state information is converted from the frequency domain to the time domain, so as to obtain initial time domain channel state information; and then, setting the time domain coefficient exceeding a preset threshold value in the initial time domain channel state information to zero to obtain the first time domain channel state information, and removing noise information in the initial time domain channel state information.
In one possible implementation, step 1022 may include: cutting off the first frequency domain channel state information to obtain second frequency domain channel state information; and performing discrete cosine transform processing on the second frequency domain channel state information to obtain a first discrete cosine transform coefficient.
Illustratively, as shown in FIG. 3, when the method is applied to communication device B, communication device B transmits first frequency domain channel state informationHigh-frequency cutting off processing is carried out, and a low-frequency part is reserved to obtain a length ofSecond frequency domain channel state information of>。
For the second frequency domain channel state informationTaking the mode according to the point, and performing discrete cosine transform processing on the information after taking the mode to obtain a first discrete cosine transform coefficient +.>。
When the method is applied to the communication equipment A, the communication equipment A carries out channel state information on a first frequency domainPerforming high frequency cutting process, and retaining low frequency part to obtain length +.>Second frequency domain channel state information of>. For second frequency domain channel state information->Taking the mode according to the point, and performing discrete cosine transform processing on the information after taking the mode to obtain a first discrete cosine transform coefficient +.>。
In this embodiment, the first frequency domain channel state information is further truncated before the discrete cosine transform processing, so that the resource requirement can be further reduced while most of the effective information is maintained, and the third time domain channel state information can be subjected to the fast fourier transform, the truncation processing and the discrete cosine transform processing to obtain the first discrete cosine transform coefficient.
In one possible implementation, step 10213 includes the sub-steps of:
step 102131, up-sampling the first time domain channel state information to obtain second time domain channel state information;
step 102132, performing filtering processing on the second time domain channel state information to obtain third time domain channel state information;
and 102133, performing fast Fourier transform on the third time domain channel state information to obtain the first frequency domain channel state information.
In step 102131, the upsampling scheme is illustratively high frequency zero padding, upsampling length isFor example, when the method is applied to communication device B, communication device B pairs the first time domain channel state information by high frequency zero padding +.>Performing upsampling to generate upsampling length +.>Second time domain channel state information of +.>。
When the method is applied to the communication equipment A, the communication equipment A performs high-frequency zero padding on the first time domain channel state informationUp-sampling to generate a length +.>Second time domain channel state information of +.>。
In the step, the up-sampling processing is performed on the channel state information of the first time domain to obtain the channel state information of the second time domain, so that the problem of low reciprocity of uplink and downlink when the discrete cosine transform is directly adopted to generate the channel key can be avoided.
In step 102132, the second time domain channel state information is filtered to obtain third time domain channel state information, so that interference information caused by up-sampling can be removed.
Illustratively, when the method is applied to communication device B, communication device B transmits second time domain channel state information because upsampling causes interference information to exist between sampling pointsFiltering to obtain third time domain channel state information +.>Interference information caused by up-sampling can be removed.
When the method is applied to the communication equipment A, the communication equipment A carries out the second time domain channel state informationFiltering to obtain third time domain channel state information +.>Interference information caused by up-sampling can be removed.
In step 102133, communication device B illustratively applies the method to third time domain channel state informationPerforming fast Fourier transform to obtain third time domain channel state information +.>Converting from time domain to frequency domain to obtain first frequency domain channel state information +.>。
When the method is applied to the communication equipment A, the communication equipment A performs the third time domain channel state informationPerforming fast Fourier transform to obtain third time domain channel state information +.>Converting the time domain into the frequency domain to obtain the first frequency domain channel state information +.>。
In this embodiment, up-sampling is performed on the channel state information of the first time domain to obtain the channel state information of the second time domain, so that the problem of low reciprocity of uplink and downlink when the discrete cosine transform is directly adopted to generate the channel key can be avoided; and filtering the second time domain channel state information to obtain third time domain channel state information, so that interference information caused by up-sampling can be removed.
In one possible implementation, step 102132 may include the sub-steps of: constructing a sinc function according to the up-sampling length corresponding to the second time domain channel state information; and obtaining third time domain channel state information according to the second time domain channel state information and the sinc function so as to remove sinc function trailing interference caused by up-sampling.
Illustratively, since upsampling may cause a phenomenon such as sinc function tailing between sampling points, when the method is applied to the communication device B, the communication device B constructs a sinc function having 1024 zero-crossings according to the upsampling length; by means of second time domain channel state informationAnd sinc function to obtain third time domain channel state information +.>And removing the sinc function tailing interference caused by up-sampling.
When the method is applied to the communication equipment A, the communication equipment A constructs a sine function with 1024 zero-crossing points according to the up-sampling length; by means of second time domain channel state informationAnd sinc function to obtain third time domain channel state informationAnd removing the sinc function tailing interference caused by up-sampling.
In this embodiment, a sinc function is constructed according to the up-sampling length corresponding to the second time domain channel state information; and obtaining third time domain channel state information according to the second time domain channel state information and the sinc function, and removing sinc function trailing interference brought by up-sampling.
It should be noted that, as shown in fig. 4, the method for generating a decorrelated channel key according to the embodiment of the present invention may include: the communication equipment of the two communication parties establishes wireless connection; extracting initial channel state information; sequentially performing denoising, upsampling, filtering, discrete cosine transform and truncation and normalization on the initial channel state information to finally obtain a channel key; the denoising process can remove noise in the initial channel state information, the up-sampling process can avoid the problem of low reciprocity of uplink and downlink when the channel key is generated by directly adopting discrete cosine transform, the filtering process can remove interference information caused by up-sampling, the discrete cosine transform process can obtain an approximately optimal decorrelation result, and the truncation and normalization processes can ensure the consistency of the integral distribution of the discrete cosine transform coefficient after truncation, so that the influence of the progressive reduction characteristic of the second discrete cosine transform coefficient on the integral safety of the channel key is reduced, the intra-frame correlation with higher initial channel state information is removed, and the safety of the channel key is improved.
The decorrelation channel key generating apparatus provided by the present invention will be described below, and the decorrelation channel key generating apparatus described below and the decorrelation channel key generating method described above may be referred to in correspondence with each other.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a decorrelated channel key generating apparatus according to an embodiment of the present invention. As shown in fig. 5, the apparatus may include:
an acquisition module 10, configured to acquire initial channel state information;
the discrete cosine transform module 20 is configured to perform discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient;
the truncation module 30 is configured to truncate the first discrete cosine transform coefficient according to a preset truncation parameter, so as to obtain a second discrete cosine transform coefficient;
the normalization module 40 is configured to normalize the standard deviation of the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient;
a generation module 50 for generating a channel key based on the discrete cosine transform coefficients.
In one example embodiment, the discrete cosine transform module 20 may include:
the denoising sub-module is used for denoising the initial channel state information to obtain first frequency domain channel state information;
and the discrete cosine transform sub-module is used for performing discrete cosine transform processing on the first frequency domain channel state information to obtain a first discrete cosine transform coefficient.
In one example embodiment, the denoising sub-module may include:
the fast Fourier inverse transformation unit is used for carrying out fast Fourier inverse transformation on the initial channel state information to obtain initial time domain channel state information;
the denoising unit is used for denoising the initial time domain channel state information to obtain first time domain channel state information;
and the fast Fourier transform unit is used for performing fast Fourier transform on the first time domain channel state information to obtain the first frequency domain channel state information.
In an example embodiment, the denoising unit is specifically configured to: and setting the time domain coefficient exceeding a preset threshold value in the initial time domain channel state information to zero so as to reduce noise information in the initial time domain channel state information and obtain first time domain channel state information.
In one example embodiment, the discrete cosine transform sub-module may include:
the cutting unit is used for cutting the first frequency domain channel state information to obtain second frequency domain channel state information;
and the discrete cosine transform unit is used for performing discrete cosine transform processing on the second frequency domain channel state information to obtain a first discrete cosine transform coefficient.
In an example embodiment, the fast fourier transform unit may include:
an up-sampling subunit, configured to perform up-sampling processing on the first time domain channel state information to obtain second time domain channel state information;
the filtering subunit is used for filtering the second time domain channel state information to obtain third time domain channel state information;
and the fast Fourier transform subunit is used for performing fast Fourier transform on the third time domain channel state information to obtain the first frequency domain channel state information.
In an example embodiment, the filtering subunit is specifically configured to:
constructing a sinc function according to the up-sampling length corresponding to the second time domain channel state information;
and obtaining third time domain channel state information according to the second time domain channel state information and the sinc function so as to remove sinc function trailing interference brought by up-sampling.
Fig. 6 illustrates a physical schematic diagram of a communication device, as shown in fig. 6, which may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. Processor 610 may invoke logic instructions in memory 630 to perform a decorrelated channel key generation method comprising: acquiring initial channel state information; performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient; according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient; carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient; a channel key is generated based on the discrete cosine transform coefficients.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method of generating a decorrelated channel key provided by the methods described above, the method comprising: acquiring initial channel state information; performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient; according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient; carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient; a channel key is generated based on the discrete cosine transform coefficients.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the above-provided decorrelated channel key generation methods, the method comprising: acquiring initial channel state information; performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient; according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient; carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient; a channel key is generated based on the discrete cosine transform coefficients.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of de-correlating a channel key, comprising:
acquiring initial channel state information;
performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient;
according to a preset cutoff parameter, performing cutoff processing on the first discrete cosine transform coefficient to obtain a second discrete cosine transform coefficient; the preset cutoff parameters comprise a first cutoff parameter and a second cutoff parameter, and the first cutoff parameter is smaller than the second cutoff parameter; the second discrete cosine transform coefficient is an element in a truncated section in the first discrete cosine transform coefficient, a first end point of the truncated section is the first truncated parameter plus 1, and a second end point of the truncated section is the second truncated parameter;
carrying out standard deviation normalization on the second discrete cosine transform coefficient segment according to a preset normalization step length to obtain a discrete cosine transform coefficient;
a channel key is generated based on the discrete cosine transform coefficient.
2. The method for generating a decorrelated channel key as claimed in claim 1, wherein said performing discrete cosine transform on said initial channel state information to obtain a first discrete cosine transform coefficient comprises:
denoising the initial channel state information to obtain first frequency domain channel state information;
and performing discrete cosine transform processing on the first frequency domain channel state information to obtain the first discrete cosine transform coefficient.
3. The method for generating the decorrelated channel key according to claim 2, wherein the denoising the initial channel state information to obtain first frequency domain channel state information comprises:
performing inverse fast fourier transform on the initial channel state information to obtain initial time domain channel state information;
denoising the initial time domain channel state information to obtain first time domain channel state information;
and performing fast Fourier transform on the first time domain channel state information to obtain the first frequency domain channel state information.
4. The method for generating a decorrelated channel key according to claim 3, wherein said denoising the initial time domain channel state information to obtain first time domain channel state information comprises:
setting the time domain coefficient exceeding a preset threshold value in the initial time domain channel state information to zero so as to reduce noise information in the initial time domain channel state information and obtain the first time domain channel state information.
5. The method for generating a decorrelated channel key as claimed in claim 2, wherein said performing discrete cosine transform on said first frequency domain channel state information to obtain said first discrete cosine transform coefficient comprises:
performing truncation processing on the first frequency domain channel state information to obtain second frequency domain channel state information;
and performing discrete cosine transform processing on the second frequency domain channel state information to obtain the first discrete cosine transform coefficient.
6. The method for generating a decorrelated channel key as claimed in claim 3, wherein said performing a fast fourier transform on said first time domain channel state information to obtain said first frequency domain channel state information comprises:
performing up-sampling processing on the first time domain channel state information to obtain second time domain channel state information;
filtering the second time domain channel state information to obtain third time domain channel state information;
and performing fast Fourier transform on the third time domain channel state information to obtain the first frequency domain channel state information.
7. The method for generating the decorrelated channel key as claimed in claim 6, wherein the filtering the second time domain channel state information to obtain third time domain channel state information comprises:
constructing a sinc function according to the up-sampling length corresponding to the second time domain channel state information;
and obtaining the third time domain channel state information according to the second time domain channel state information and the sinc function.
8. A decorrelated channel key generating apparatus, comprising:
the acquisition module is used for acquiring initial channel state information;
the discrete cosine transform module is used for performing discrete cosine transform processing on the initial channel state information to obtain a first discrete cosine transform coefficient;
the truncation module is used for performing truncation processing on the first discrete cosine transform coefficient according to a preset truncation parameter to obtain a second discrete cosine transform coefficient; the preset cutoff parameters comprise a first cutoff parameter and a second cutoff parameter, and the first cutoff parameter is smaller than the second cutoff parameter; the second discrete cosine transform coefficient is an element in a truncated section in the first discrete cosine transform coefficient, a first end point of the truncated section is the first truncated parameter plus 1, and a second end point of the truncated section is the second truncated parameter;
the normalization module is used for carrying out standard deviation normalization on the second discrete cosine transform coefficient segments according to a preset normalization step length to obtain discrete cosine transform coefficients;
and the generation module is used for generating a channel key based on the discrete cosine transform coefficient.
9. A communication device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the decorrelated channel key generation method of any one of claims 1 to 7 when the program is executed.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the decorrelated channel key generation method of any of claims 1 to 7.
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