CN105323025B - A kind of frequency spectrum access method based on cognition OFDM - Google Patents
A kind of frequency spectrum access method based on cognition OFDM Download PDFInfo
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- CN105323025B CN105323025B CN201510785863.9A CN201510785863A CN105323025B CN 105323025 B CN105323025 B CN 105323025B CN 201510785863 A CN201510785863 A CN 201510785863A CN 105323025 B CN105323025 B CN 105323025B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
Abstract
The invention discloses a kind of frequency spectrum access method based on cognition OFDM, including 1) the frequency spectrum access surplus r of configuration transmitting terminal, the basic wireless communication parameters of receiving terminal, OFDM symbol parameter and transmitting terminal；2) before sending first, the useful signal of a segment signal length is intercepted from main channel；3) total data of the array F caused by second step is divided into N groups in order；4) criterion, 01 sequence S of the generation with N number of element are verified according to frequency range；5) frequency range verification sequence, the transmitting terminal decide whether to access at this moment according to obtained by the 4th step；6) L effectively subcarriers are assigned in a unappropriated frequency range by the information representated by each in the frequency range verification sequence according to obtained by the 4th step, transmitting terminal, its remaining sub-carriers pad 0；7) receiving terminal is configured as, according to preamble information, obtaining and sending end data, and after receiving first, the receiving terminal is switched into main channel.
Description
Technical field
It is quick to realize the present invention relates to radio communication access field, more particularly to a kind of cut-in method of wireless network
Access, while improve band efficiency.
Background technology
The problem of high speed development of radio communication and extensive use cause frequency spectrum rare in recent years increasingly sharpens, radio communication
Need to take frequency spectrum resource, the fixed frequency spectrum resource division of tradition causes frequency spectrum to have become a kind of scarce resource.At present
The frequency spectrum of distribution is but very low in the availability of frequency spectrum of most places and most of time, and at the same time, without authorizing frequency
The availability of frequency spectrum of section is but very high.The the allocated frequency spectrum of the overwhelming majority is not either in time still spatially all using
Foot.
Relatively low with the rare contradiction of frequency spectrum resource in order to solve the existing availability of frequency spectrum, cognitive radio technology is suggested,
Its core concept is that cognitive user (secondary user's) can be moved when frequency spectrum resource owner (primary user) does not have busy channel
State access primary user possesses channel and carried out data transmission, but transmission that can not be to primary user carries out larger interference.Recognize nothing
Line electricity is proposed on the basis of software and radio technique, mainly emphasizes the cognitive ability of communication system, and cognitive function is mainly reflected in
It learns that with inferential capability and artificial intelligence technology etc., prominent cognitive radio communication systems the rings such as study can be passed through
Section, the change of continuous cognitive radio communication environment, and adapted to wirelessly by being adaptively adjusted the messaging parameter of therein
The change of environment.
The thought using cognitive radio is wirelessly transferred, system passes through frequency spectrum perception and dynamic access without fixed channel
To realize the real-time transmitting of video data, that is, ensure the interference limitation to existing network, while also increase its own system
Antijamming capability.The rapid deployment of mobile monitor can be met by reaching, and can meet that video information is wirelessly transferred it is real-time can
By high efficiency of transmission, hide electromagnetic interference, improve the purpose of the availability of frequency spectrum.
OFDM has good noise robustness and ability of anti-multipath, possessed at a high speed as a kind of multi-carrier modulation technology
The ability of the rate dissemination of information, it is considered to be the key technology in 4G GSMs.OFDM is recognized as fusion cognition wireless
The technology of electric thought and OFDM modulation systems, OFDM technology is made full use of to allow interference, subcarrier distribution spirit be present between subcarrier
The advantages of living, realize efficient spectrum utilization.
Found through being retrieved to existing literature, most close implementation is that Chinese Patent Application No. is：
It is 201410123924.0 entitled：A kind of distribution method of cognition OFDM network sub-carriers, but the contrast is literary
The distribution method of OFDM networks sub-carriers in part, implementation complexity is high, is not suitable for needing rapid access to establish radio communication
The scene of link.Common OFDM networks can only utilize fixed channel to transmit information, and the availability of frequency spectrum is relatively low.Do not carry out dynamic
Frequency spectrum perception and switching, it is impossible to the fine communication environment that must adapt to dynamic change.
Therefore, those skilled in the art is directed to developing a kind of frequency spectrum access method based on cognition OFDM, to improve
The band efficiency and reliability of wireless channel.
The content of the invention
In view of the drawbacks described above of prior art, the technical problems to be solved by the invention are how not influence primary user
On the basis of wireless channel, new wireless network user cut-in method is proposed, to improve the band utilization of wireless channel
Rate；How to perceive which resource of frequency range is used or by noise severe jamming by primary user, therefrom selects not yet occupied
Optimal spectrum fragment accessed；How to ensure that different user is wirelessly transferred reliable on the basis of solving the problems, such as the first two
Property.
To achieve the above object, the invention provides a kind of frequency spectrum access method based on cognition OFDM, including following step
Suddenly：
The first step：Configure the frequency of transmitting terminal, the basic wireless communication parameters of receiving terminal, OFDM symbol parameter and transmitting terminal
Spectrum access surplus r；
Second step：The transmitting terminal is configured as before sending first, and one section of useful signal, institute are intercepted from main channel
The signal length for stating useful signal is N integral multiple, and carries out Fast Fourier Transform (FFT) to it, then modulus, so as to generate frequency
Compose array F；
3rd step：The transmitting terminal is configured as the total data of the array F caused by second step decile in order
Into N groups, N number of frequency range is represented, each group is averaged respectively, and averaging of income value is normalized, it is the equal of N to obtain length
It is worth array A；Then difference is calculated to the array F, then seeks absolute value, the array D isometric with array F is obtained, by the array D
Total data be also divided into N groups in order；
4th step：The transmitting terminal is configured as verifying criterion according to frequency range, and generation has 01 sequence S of N number of element, its
In 0 represent the frequency range and not yet taken by primary user, transmitting terminal can access, otherwise 1 represents transmitting terminal and cannot access；
5th step：The frequency range verification sequence according to obtained by the 4th step, the transmitting terminal decide whether to access at this moment；
6th step：Information representated by each in the frequency range verification sequence according to obtained by the 4th step, transmitting terminal are effective by L
Subcarrier is assigned in a unappropriated frequency range, its remaining sub-carriers pad 0, so as to generate OFDM symbol, and then is packaged into number
It is transmitted according to bag, receiving terminal switches to main channel from common signal channel after sending first；
7th step：The receiving terminal is configured as, according to preamble information, obtaining and sending end data, after receiving first,
The receiving terminal is switched into main channel, receiving terminal carrier wave interception way is adjusted according to detection sequence, received again afterwards
When can directly intercept data in effective subcarrier, the receiving terminal and the transmitting terminal will communicate in main channel.
Further, the effective sub-carrier number L of OFDM are configured described in the first step and are arranged to secured transmission of payload data with before
The total number of sub-carriers of leading code；The frequency spectrum access surplus r of configuration is configured as reserving no subcarrier number, to ensure different use
Certain intervals are reserved between frequency spectrum used in family.
Further, in the 4th step, the frequency range verifies criterion, comprises the following steps：
4.1. transmitting terminal selectes a threshold value, successively with each element ratio in average array A compared with there is two kinds of situations：
4.1.1.A k-th of elements A [k] in is more than threshold value described in step 4.1, then judges frequency range corresponding to the group
Through being taken by primary user, k-th of element S [k] in S is set to 1；
4.1.2.A k-th of elements A [k] in is not more than threshold value described in step 4.1, then goes to step 4.2, continue
Judge in next step；
4.2. for array D kth group data, take out each element and make following computing：By the element and A
It is poor then squared that [k] makees；If acquired results are not more than A [k] after the above-mentioned computing of each element of kth group data, by S
[k] is set to 0；Acquired results are more than A [k] after otherwise some element existed in kth group data causes above-mentioned computing, then by S
[k] is set to 1.
Further, the 5th step comprises the steps of：
5.1. it if 0 number is less than L and r sums in sequence, then wouldn't access, after delay waits certain time, go to
Step 1, re-start and carry out signal interception；
5.2. if 0 number is more than or equal to L and r sums in sequence, then carrier frequency is switched to public letter by transmitting terminal
Road goes to step 6, prepares subcarrier parameter required during configuration access.
The present invention is achieved by the following technical solutions, comprises the following steps：
The first step：Configure transmitting terminal, the basic wireless communication parameters of receiving terminal, OFDM symbol parameter, and transmitting terminal
Frequency spectrum access surplus r.
The carrier frequency, IQ speed, modulation that the basic wireless communication parameters mainly include common signal channel and main channel are joined
Number, the wireless communication parameters such as filter parameter, packet structure parameter.
The OFDM symbol parameter comprises at least the effective sub-carrier number L of OFDM total number of sub-carriers N, OFDM, cyclic prefix length
Degree.
The effective sub-carrier numbers of OFDM refer to the total number of sub-carriers for secured transmission of payload data and lead code.
The frequency spectrum access surplus r refers to, in order to ensure to reserve certain intervals between frequency spectrum used in different user, reserve not
Subcarrier number.
In order to ensure that receiving terminal and transmitting terminal can realize correct radio communication, it is necessary to assure transmitting terminal carrier wave when initial
Frequency is in main channel, and receiving terminal carrier frequency is in common signal channel, it is necessary to assure receiving terminal and transmitting terminal remaining substantially without
Line messaging parameter and OFDM symbol parameter configuration are identical.What OFDM total number of sub-carriers N was represented is exactly to be sent in ofdm communication system
End carries out an inverse fast fourier (IFFT), and receiving terminal carries out the points of Fast Fourier Transform (FFT) (FFT).
Second step：Transmitting terminal intercepts the useful signal (signal length of certain length before sending first from main channel
Should be N integral multiple), and Fast Fourier Transform (FFT) is carried out to it, then modulus, so as to generate frequency spectrum array F.
3rd step：The total data of array F caused by second step is divided into N groups by transmitting terminal in order, represents N number of frequency
Section, is averaged to each group respectively, and averaging of income value is normalized, and obtains the average array A that length is N.Then it is right
Array F calculates difference, then seeks absolute value, obtains the array D isometric with array F, by array D total data also decile in order
Into N groups.
4th step：Transmitting terminal frequency range according to obtained by the 4th step verifies criterion, and generation has 01 sequence S of N number of element, wherein
0 represents the frequency range is not yet taken by primary user, and transmitting terminal can access, and on the contrary 1, which represents transmitting terminal, to access
The frequency range verifies criterion, comprises the following steps：
4.1. transmitting terminal selectes a threshold value, successively with each element ratio in average array A compared with there is two kinds of situations：
4.1.1.A k-th of elements A [k] in is more than threshold value described in step 4.1, then judges frequency range corresponding to the group
Through being taken by primary user, k-th of element S [k] in S is set to 1.
4.1.2.A k-th of elements A [k] in is not more than threshold value described in step 4.1, then goes to step 4.2, continue
Judge in next step.
4.2. for array D kth group data, take out each element and make following computing：By the element and A
It is poor then squared that [k] makees.If acquired results are not more than A [k] after the above-mentioned computing of each element of kth group data, by S
[k] is set to 0；Acquired results are more than A [k] after otherwise some element existed in kth group data causes above-mentioned computing, then by S
[k] is set to 1.
5th step：The frequency range verification sequence according to obtained by the 4th step, transmitting terminal decide whether to access at this moment, there is two kinds of feelings
Condition：
5.1. 0 number is less than L and r sums in sequence, then wouldn't access, and after delay waits certain time, goes to first
Step, re-start and carry out signal interception.
5.2. 0 number is not less than L and r sums in sequence, then carrier frequency is switched to common signal channel and gone to by transmitting terminal
Step 6, prepare subcarrier parameter required during configuration access.
6th step：Information representated by each in the frequency range verification sequence according to obtained by the 4th step, transmitting terminal are effective by L
Subcarrier is assigned in a unappropriated frequency range, its remaining sub-carriers pad 0, so as to generate OFDM symbol.Transmitting terminal is sent out first
Subcarrier distribution condition is packaged into packet in the form of 01 sequence when sending to be transmitted by common signal channel, sent into first
Receiving terminal switches to main channel from common signal channel after work(, starts to communicate with receiving terminal according to distribution condition before.
7th step：Receiving terminal, using correlation capturing mode, obtains according to preamble information and sends end data, receive first
Afterwards, receiving terminal is switched into main channel, receiving terminal carrier wave interception way is adjusted according to the subcarrier assigned sequence received,
The data in effective subcarrier can be directly intercepted when being received again afterwards, receiving terminal and transmitting terminal can lead in main channel
Letter, is successfully accessed.
It is an advantage of the invention that：Many fritters are divided the spectrum into during frequency spectrum perception to be analyzed respectively, are entered
Which resource of frequency range is one step perceive is used or by noise severe jamming by primary user, then therefrom selects not yet occupied
Optimal spectrum fragment accessed.Not only complexity is low, and access speed is fast, and can effectively utilize valuable frequency spectrum money
Source, improve spectrum utilization efficiency.
Design, concrete structure and the caused technique effect of the present invention are described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description of the drawings
Fig. 1 is the hardware connection figure of the preferred embodiment of the present invention；
Fig. 2 is the OFDM frequency spectrum access communications processes of the preferred embodiment of the present invention；
Fig. 3 be the present invention a preferred embodiment primary user in the presence of receiving terminal spectrogram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.The present embodiment enters under premised on technical solution of the present invention
Row is implemented, and gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following realities
Apply example.
Transmitting terminal, receiving terminal in the present embodiment, primary user's analog end use wireless universal electricity ancillary equipment, such as Fig. 1, and three
Person is controlled by PC.Whole process flow is as shown in Figure 2.
The first step：Configure transmitting terminal, the basic wireless communication parameters of receiving terminal, OFDM symbol parameter, and transmitting terminal
Frequency spectrum access surplus r.
The basic wireless communication parameters of transmitting terminal and receiving terminal, including receiving terminal configuration common signal channel are configured in the present embodiment
Carrier frequency 2.41GHz, transmitting terminal configuration main channel carrier frequency 2.42GHz, IQ speed 2M, transmitting terminal and receiving terminal configuration hair
Power 1.5dbm is penetrated, using QPSK modulation demodulation systems, up-sampling multiple is 8, and formed filter and matched filter are root
Raised cosine filter, rolloff-factor 0.5, filter length 6.Configuration data pack arrangement parameter is lead code 26bits, synchronous
Position 30bits, bag sequence number 32bits, information bit 2296bits, CRC check position 16bits, the symbol 200 for Packet capturing.Match somebody with somebody
The OFDM symbol parameter for putting transmitting terminal and receiving terminal is OFDM total number of sub-carriers 320, the effective sub-carrier numbers 152 of OFDM, before circulation
Sew length 64.Configure the frequency spectrum access surplus r=5 of transmitting terminal.
Second step：Transmitting terminal intercepts the useful signal (signal length of certain length before sending first from main channel
Should be N integral multiple), and Fast Fourier Transform (FFT) is carried out to it, then modulus, so as to generate frequency spectrum array F.
Transmitting terminal captures 6500 valid data caused by primary user's analog end by energy measuring in the present embodiment, to it
Fast Fourier Transform (FFT) and then modulus are carried out, generates the frequency spectrum array F being made up of 6500 real numbers.
3rd step：The total data of array F caused by second step is divided into N groups by transmitting terminal in order, represents N number of frequency
Section, is averaged to each group respectively, and averaging of income value is normalized, and obtains the average array A that length is N.Then it is right
Array F calculates difference, then seeks absolute value, obtains the array D isometric with array F, by array D total data also decile in order
Into N groups, subsequent treatment is given over to.
In the present embodiment, array F total data is divided into 256 groups by transmitting terminal in order, and each group is asked respectively
Average value, and averaging of income value is normalized, obtain average array A.Then difference is calculated to array F, then seeks absolute value, obtained
Array D, array D total data is also divided into 256 groups in order, then each group of array D there are 25 elements.
4th step：Transmitting terminal verifies criterion, 01 sequence S of the generation with N number of element, wherein 0 represents the frequency according to frequency range
Duan Shangwei is taken by primary user, and transmitting terminal can access, and on the contrary 1, which represents transmitting terminal, to access.
In the present embodiment, threshold value, which elects 0.2, S as, 256 elements.Through comparing A [119] to A [129], A [131] to A
[143] it is the element more than threshold value, therefore S [117] to S [129], S [131] to S [143] are set to 1.For remaining element A in A
[k], i-th of the element of kth group for remembering D are D [k] [i], for i from 1 to 25, can be existed in the hope of working as k=118, during k=130
Some i causes (A [k]-D [k] [i])2>A[k].Therefore S [128], S [130] are put 1, remaining element is set to 0.
5th step：The frequency range verification sequence according to obtained by the 4th step, transmitting terminal decide whether to access at this moment.
In the present embodiment, it is 1 that frequency range verification sequence, which only has S [118] to S [143] to have 25 elements altogether, remaining 231 member
Element is 0, L+r=152+5=157<231, therefore transmitting terminal switches to carrier frequency the 2.41GHz of common signal channel, prepares configuration
Required subcarrier parameter during access.
6th step：Information representated by each in the frequency range verification sequence according to obtained by the 4th step, transmitting terminal are effective by L
Subcarrier is assigned in a unappropriated frequency range, its remaining sub-carriers pad 0, so as to generate OFDM symbol.Transmitting terminal is sent out first
Subcarrier distribution condition is packaged into packet in the form of 01 sequence when sending to be transmitted by common signal channel, sent into first
Receiving terminal switches to main channel from common signal channel after work(, starts to communicate with receiving terminal according to distribution condition before.
In the present embodiment, transmitting terminal at random distributes subcarrier to idle channel on the premise of primary user is not disturbed, certain
It is secondary to distribute 152 subcarriers to the 5th to 77 subcarrier and the 170th to 248 subcarrier in 256 subcarriers.Its
Remaining sub-carriers whole pad 0 is handled.Therefore transmitting terminal by 256 01 data for representing channel distribution situation (0 represent pad 0,1 represent hair
Send valid data) packing, receiving terminal is sent to by common signal channel.32 bag sequence number positions of wherein packet are set to 1 entirely, are easy to
Receiving terminal identifies.
7th step：Receiving terminal, using correlation capturing mode, obtains according to preamble information and sends end data, receive first
Afterwards, receiving terminal is switched into main channel, receiving terminal carrier wave interception way is adjusted according to the subcarrier assigned sequence received,
The data in effective subcarrier can be directly intercepted when being received again afterwards, receiving terminal and transmitting terminal can lead in main channel
Letter, is successfully accessed.
In the present embodiment, the frequency spectrum that receiving terminal is switched to after main channel is as shown in figure 3, the data distribution that transmitting terminal is sent exists
The 5th to 77 subcarrier and the 170th to 248 subcarrier in 256 subcarriers.The 118th to 143 middle son carries
Ripple is shared by primary user, therefore receiving terminal does not process.So transmitting terminal can not disturb primary user with receiving terminal, and fully
Ofdm communication is realized on the premise of using frequency spectrum.
Scheme of the present invention is to carry out frequency spectrum perception based on cognitive radio thought, and selection is not disturbed at present or accounts for
With the preferable OFDM subcarrier groups of channel quality carry out dynamic access.Another alternative solution is：Transmitting terminal is without frequency spectrum sense
Know, data message is sent in the subcarrier group specified in advance.
Preferred embodiment of the invention described in detail above.It should be appreciated that the ordinary skill of this area is without wound
The property made work can makes many modifications and variations according to the design of the present invention.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (4)
1. a kind of frequency spectrum access method based on cognition OFDM, it is characterised in that comprise the following steps：
The first step：The frequency spectrum for configuring transmitting terminal, the basic wireless communication parameters of receiving terminal, OFDM symbol parameter and transmitting terminal connects
Enter surplus r；The OFDM symbol parameter includes the effective sub-carrier number L of OFDM total number of sub-carriers N, OFDM, circulating prefix-length；
Second step：The transmitting terminal is configured as before sending first, and one section of useful signal is intercepted from main channel, described to have
The signal length for imitating signal is N integral multiple, and carries out Fast Fourier Transform (FFT) to it, then modulus, so as to generate spectrum number
Group F；
3rd step：The transmitting terminal is configured as the total data of the array F caused by second step being divided into N in order
Group, N number of frequency range is represented, each group is averaged respectively, and averaging of income value is normalized, obtain the average that length is N
Array A；Then difference is calculated to the array F, then seeks absolute value, the array D isometric with array F is obtained, by the array D's
Total data is also divided into N groups in order；
4th step：The transmitting terminal is configured as verifying criterion, 01 sequence S of the generation with N number of element, wherein 0 according to frequency range
Represent the frequency range not yet to be taken by primary user, transmitting terminal can access, and on the contrary 1, which represents transmitting terminal, to access；5th step：Root
According to frequency range verification sequence obtained by the 4th step, the transmitting terminal decides whether to access at this moment；
6th step：Information representated by each in the frequency range verification sequence according to obtained by the 4th step, transmitting terminal carry L effectively sons
Wavelength-division is fitted in a unappropriated frequency range, its remaining sub-carriers pad 0, so as to generate OFDM symbol, and then is packaged into packet
It is transmitted, receiving terminal switches to main channel from common signal channel after sending first；
7th step：The receiving terminal is configured as, according to preamble information, obtaining and sending end data, after receiving first, by institute
State receiving terminal and switch to main channel, receiving terminal carrier wave interception way, energy when being received again afterwards are adjusted according to detection sequence
Enough data directly intercepted in effective subcarrier, the receiving terminal and the transmitting terminal will communicate in main channel.
2. the frequency spectrum access method according to claim 1 based on cognition OFDM, it is characterised in that configuration described in the first step
The effective sub-carrier number L of OFDM are arranged to the total number of sub-carriers of secured transmission of payload data and lead code；The frequency spectrum access of configuration
Surplus r is configured as reserving no subcarrier number, to ensure to reserve certain intervals between frequency spectrum used in different user.
3. the frequency spectrum access method according to claim 1 based on cognition OFDM, it is characterised in that described in the 4th step
Frequency range verifies criterion, comprises the following steps：
4.1. transmitting terminal selectes a threshold value, successively with each element ratio in average array A compared with there is two kinds of situations：
4.1.1.A k-th of elements A [k] in is more than threshold value described in step 4.1, then judge frequency range corresponding to the group by
Primary user is taken, and k-th of element S [k] in S is set into 1；
4.1.2.A k-th of elements A [k] in is not more than threshold value described in step 4.1, then goes to step 4.2, continue next
Step judges；
4.2. for array D kth group data, take out each element and make following computing：The element and A [k] are made
Difference, then it is squared；If acquired results are not more than A [k] after the above-mentioned computing of each element of kth group data, S [k] is put
For 0；Acquired results are more than A [k] after otherwise some element existed in kth group data causes above-mentioned computing, then put S [k]
For 1.
4. a kind of frequency spectrum access method based on cognition OFDM according to claim 1, it is characterised in that the 5th step includes
The following steps：
5.1. it if 0 number is less than L and r sums in sequence, then wouldn't access, after delay waits certain time, go to step
One, re-start and carry out signal interception；
5.2. if 0 number is more than or equal to L and r sums in sequence, then carrier frequency is switched to common signal channel and turned by transmitting terminal
To step 6, prepare subcarrier parameter required during configuration access.
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| CN1930801A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| WO2013112983A2 (en) * | 2012-01-26 | 2013-08-01 | Interdigital Patent Holdings, Inc. | Dynamic parameter adjustment for lte coexistence |
| CN103841071A (en) * | 2012-11-22 | 2014-06-04 | 普天信息技术研究院有限公司 | Method for channel extermination in wireless communication system |
| CN103997739A (en) * | 2014-06-11 | 2014-08-20 | 哈尔滨工业大学 | Method for achieving dynamic spectrum allocation in cognitive radio |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1930801A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method and apparatus for transmitting/receiver channel quality information in a communication system using an orthogonal frequency division multiplexing |
| WO2013112983A2 (en) * | 2012-01-26 | 2013-08-01 | Interdigital Patent Holdings, Inc. | Dynamic parameter adjustment for lte coexistence |
| CN103841071A (en) * | 2012-11-22 | 2014-06-04 | 普天信息技术研究院有限公司 | Method for channel extermination in wireless communication system |
| CN103997739A (en) * | 2014-06-11 | 2014-08-20 | 哈尔滨工业大学 | Method for achieving dynamic spectrum allocation in cognitive radio |
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