CN104980389B - It is applicable in new user's otherness selection cut-in method of non-orthogonal multiple system - Google Patents
It is applicable in new user's otherness selection cut-in method of non-orthogonal multiple system Download PDFInfo
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Abstract
It is applicable in new user's otherness selection cut-in method of non-orthogonal multiple system, is related to a kind of new user's otherness selection access technology for being applicable in non-orthogonal multiple system.It is in order to which the new addition user met under non-orthogonal multiple system is preferably linked into network.Its method: the first step, the information resources pond for establishing Whole frequency band candidate user collection；Second step, selection sub-band, meet bandwidth demand；Third step, sequence calculate Signal to Interference plus Noise Ratio difference；4th step calculates the ratio A that the number of users that each sub-band meets preset standard accounts for the total candidate user of each sub-bandl, by ratio AlSequence sequence from small to large.Step 5: selectionNew access user information and other candidate user information are realized nonopiate coding using supercomposed coding by the 6th step, complete the transmission of signal.The present invention is applicable in new user's otherness selection access of non-orthogonal multiple system, and the present invention can satisfy the demand of the new user's access scheme of the following 5G.
Description
Technical field
The present invention relates to a kind of applicable non-orthogonal multiple systems (NOMA, Non-Orthogonal Multiple Access)
New user's otherness select access technology.
Background technique
Mobile communication technology develops to today, and frequency spectrum resource also becomes more and more nervous.Meanwhile in order to meet increasing at full speed
Long mobile service demand, people have begun find not only be able to satisfy user experience demand and can improve spectrum efficiency newly
Mobile communication technology.There has been proposed non-orthogonal multiple technology (NOMA, Non-Orthogonal in this background
Multiple Access)。
The basic thought of non-orthogonal multiple technology (NOMA, Non-Orthogonal Multiple Access) is to emit
End sends user information using non-orthogonal manner, actively introduces interference information, mainly uses superimposed code (SC, Superposition
Coding) Lai Shixian deletes (SIC, Successive Interference by serial interference in receiving end
Cancellation) receiver or other effectively receivers realize correct demodulation.Although the receiver using SIC technology is complicated
Degree improves, but can improve spectrum efficiency well.Spectrum efficiency is exchanged for the complexity for improving receiver,
Here it is the essence of NOMA technology.
The subchannel transmission of NOMA technology still uses orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency
Division Multiplexing) technology, be between subchannel it is orthogonal, do not interfere with each other, but on every sub-channels no longer only
Distribute to a user, but multiple user sharings.Between different user it is non orthogonal transmissions in same subchannel, thus can
Inter-user interference problem is generated, therefore, Multiuser Detection is carried out using SIC technology in receiving end, is properly received to realize
The purpose of corresponding information.In transmitting terminal, the different user in same subchannel is sent using power sharing technology, no
The signal power of same user is allocated according to relevant algorithm, reaches the signal power of each user in receiving end not in this way
Equally.SIC receiver carries out interference elimination with signal power size further according to different families in a certain order, realizes correct solution
It adjusts, while also having achieved the purpose that distinguish user.
For new user's access scheme in LTE system is both for orthogonal multiple access system.It is new under non-orthogonal system
User's access scheme can not scheme under directly transplanting orthogonal system, need to propose the new use of a suitable non-orthogonal multiple system
Family otherness selects access scheme, meets the needs of following 5G new user's access scheme.
Summary of the invention
The present invention is in order to which the new addition user met under non-orthogonal multiple system is preferably linked into network, to provide
A kind of new user's otherness selection cut-in method being applicable in non-orthogonal multiple system.
It is applicable in new user's otherness selection cut-in method of non-orthogonal multiple system, it is realized by following steps:
Step 1: entire frequency band B is divided into S sub-band, S is positive integer；Each N number of candidate use of sub-band multiplexing
Family, N are positive integer；In each sub-band, the channel condition of itself and affiliated sub-band number are placed on one by N number of candidate user
In a memory, and it is ranked up by the size of sub-band；To establish the information resources pond of the candidate user collection of Whole frequency band；
Step 2: business demand of the new access user according to itself, in the information resources pond of the candidate user collection of Whole frequency band
Middle to select to meet the sub-band initial value of own service demand, record meets the sub-band serial number of amount of bandwidth later, and will after
Continue all sub-bands for meeting bandwidth demand and concentrates number of users to be ranked up from small to large according to candidate user；
Step 3: sequentially calculating all candidate use in all sub-bands for meeting bandwidth demand according to the sequence of step 2
The dry of family is made an uproar than difference, and judges whether to meet:
|SINRi+1-SINRj+1|>10dB
Record all candidate user numbers for meeting the condition；J is positive integer, and the initial value of j is 0；
The ratio of the total candidate user of the sub-band is accounted for Step 4: calculating each sub-band and meeting the number of users of step 3 conditional
Al, and press ratio AlIt is ranked up from small to large；
Step 5: calculating:
The sub-band of access is selected as new user；
Step 6: new access user information is non-using supercomposed coding realization with other candidate user information in the sub-band
Orthogonal coding, and carry out signal transmission.
According to the sequence of step 2 described in step 3, all times in all sub-bands for meeting bandwidth demand are sequentially calculated
It selects the dry of family to make an uproar than difference, and judges whether to meet:
|SINRi+1-SINRj+1|>10dB
The specific method for recording all candidate user numbers for meeting the condition is:
Step 3 one, by the user in sub-band i according toSequence from small to large is arranged；
hiIndicate user i respective channels gain；σiIndicate the noise power under user i respective channels；
Step 3 two, according to formula:
Calculate the Signal to Interference plus Noise Ratio of each candidate userI is sub-band sequence；The sequence of j user；
In formula: βiIndicate the power allocation factor of j-th of user；The transmission power distributed on each sub-band of P；
Step 3 three, according to formula:
Calculate the difference of Signal to Interference plus Noise Ratio
Whether the difference that step 3 four, judgment step three or three obtain meets:
|SINRi+1-SINRj+1|>10dB
Step 3 five, record meet the number of users of step 3 four.
Ratio A is pressed described in step 4lDuring being ranked up from small to large,
If there is the equal situation of ratio, then the preferential few sub-band of selection candidate user number；If there is ratio and
The case where candidate user number is equal then determines the sequencing between corresponding ratio at random.
A kind of applicable non-orthogonal multiple system (NOMA, Non-Orthogonal Multiple proposed by the present invention
Access new user access method) main advantage: one, meets the new user access request of non-orthogonal system.Two, new
Access scheme sufficiently used for reference the advantage in orthogonal scheme, both considered the overall channel maximum capacity of system, it is contemplated that
Fairness between user.The present invention can satisfy the demand of the new user's access scheme of the following 5G.
Detailed description of the invention
Fig. 1 is that the CDF curve based on user's SINR difference emulates schematic diagram；
Fig. 2 is that different sub-band users distribute emulation schematic diagram under NOMA system；
Fig. 3 is new user access method flow chart under NOMA system；
Fig. 4 is new user's access strategy performance simulation schematic diagram under NOMA system；
Specific embodiment
Specific embodiment one illustrates present embodiment, the non-orthogonal multiple that this patent proposes in conjunction with Fig. 1 to Fig. 4
New user access method under system, is broadly divided into following steps:
Step 1: establishing the information resources pond of Whole frequency band candidate user collection
Entire frequency band B is divided into S sub-band, and each sub-band is multiplexed N number of user, in order to which new access user easily connects
Enter the information resources for first having to establish the candidate user collection of each sub-band on entire frequency band to the sub-band for meeting Applied criteria
Pond.
Carried out by candidate user collection information resources pond be candidate user in each sub-band by the channel condition of itself and
Affiliated sub-band number is placed on a memory, sorts by the size of sub-band.The time of access has been saved in the foundation of resource pool.
Step 2: selection sub-band, meets bandwidth demand
New access user according to itself business demand, in resource pool selection meet self-demand sub-band it is initial
Value, record meets the sub-band serial number of amount of bandwidth later, and by subsequent all sub-bands for meeting bandwidth demand according to candidate
User concentrates the sequence sequence of number of users from small to large.
Step 3: sequence calculates Signal to Interference plus Noise Ratio difference (SINR Difference)
In order to ensure user uses serial interference elimination (SIC) Shi Jinliang in receiving end in selected sub-band in NOMA system
Small error propagation (EP, Error Propagation), needs to select the difference of the Signal to Interference plus Noise Ratio between new user and candidate user
Meet curve shown in FIG. 1.
It was found from curve shown in FIG. 1:
|SINRi+1-SINRj+1|>10dB (3)
Meet (3) formula it is ensured that lesser error propagation exists.
(1), user is sorted by channel condition
By the user in sub-band i according toSequence arrangement from small to large.
(2), the Signal to Interference plus Noise Ratio of user is calculated
Wherein in i-th of sub-band j-th of user Signal to Interference plus Noise Ratio calculating formula are as follows:
WhereinIndicate the Signal to Interference plus Noise Ratio (SINR) of j-th of user in i-th of sub-band.
(3), SINR difference is calculated:
(4) it recordsMeet the number of users of (3) formula.
4th step, the number of users for calculating each sub-band satisfaction (3) formula account for the ratio A of the total candidate user of each sub-bandl, by than
Value AlSequence sequence from small to large.
Step 5: selection
Under conditions of ratio is equal, the few sub-band of selection candidate user number；If ratio and candidate user number are homogeneous
Deng just random to select wherein.
Step 6: new access user information and other candidate user information are realized nonopiate coding using supercomposed coding.
The transmission of signal is completed later.
The Applied criteria of present invention proposition algorithm:
1, power system capacity maximal criterion
Wherein: CNOMA(Γ) indicates the channel capacity of NOMA multi-address system, and Γ indicates that Signal to Interference plus Noise Ratio, S indicate bandwidth B distribution
Sub-band total number, βjIndicate that the power allocation factor of j-th of user, N indicate the user's number being multiplexed on each sub-band.
2, fairness criterion
Consider the fairness of each user's transmission rate,
Wherein:
Wherein: P indicates the transmission power distributed on each sub-band, | hi|2User's i respective channels gain,It indicates to use
Noise power under the i respective channels of family.
Effect of the invention is illustrated using specific l-G simulation test below:
1, application scenarios explanation
Since under non-orthogonal multiple system, the limitation of its channel condition of new access user, resource allocation is an emphasis
The problem of research, will select interference few, and SINR differs by more than EP and generates on the sub-band of range.Fig. 2 gives different
The user of sub-band accesses situation.
2, new user access method flow chart under non-orthogonal multiple system
The description above method for clarity, provides the flow chart of method, as shown in Figure 3.
3, method performance simulation
The scheme proposed according to the present invention, compared with traditional new user's random access scheme, simulated effect figure such as Fig. 4
It is shown, wherein IWF (Iteration Water Filling), FTPA (Fractional Transmit Power
) and FPA (Fixed Power Allocation) power allocation scheme Allocation.
Under identical power allocation scheme, the performance of otherness selection access of the invention is substantially better than random selection side
Case, performance make an appointment greatly 1.5dB.
Claims (2)
1. it is applicable in new user's otherness selection cut-in method of non-orthogonal multiple system, it is characterized in that: it is realized by following steps:
Step 1: entire frequency band B is divided into S sub-band, S is positive integer；Each sub-band is multiplexed N number of candidate user, and N is
Positive integer；In each sub-band, the channel condition of itself and affiliated sub-band serial number are placed on one and deposited by N number of candidate user
In reservoir, and it is ranked up by the size of sub-band；To establish the information resources pond of the candidate user collection of Whole frequency band；
Step 2: business demand of the new access user according to itself, in the information resources Chi Zhongxuan of the candidate user collection of Whole frequency band
The sub-band initial value for meeting own service demand is selected, record meets the sub-band serial number of amount of bandwidth later, and by subsequent institute
There is the sub-band for meeting bandwidth demand to concentrate number of users to be ranked up from small to large according to candidate user；
Step 3: sequentially calculating all candidate users in all sub-bands for meeting bandwidth demand according to the sequence of step 2
Signal to Interference plus Noise Ratio difference, and judge whether to meet:
|SINRi+1-SINRj+1|>10dB
Record all candidate user numbers for meeting the condition；J is positive integer, and the initial value of j is 0；I, j is candidate user
Serial number, i ≠ j；
The ratio of the total candidate user of the sub-band is accounted for Step 4: calculating each sub-band and meeting the candidate user number of step 3 conditional
Al, and press ratio AlIt is ranked up from small to large；
Step 5: calculating:
Under conditions of ratio is equal, the few sub-band of selection candidate user number；If ratio and candidate user number are equal, just
It is selected in multiple sub-bands that ratio and candidate user number are equal at random, the sub-band of access is selected as new user；L is
Sub-band serial number；
Step 6: new access user information is nonopiate using supercomposed coding realization with other candidate user information in the sub-band
Coding, and carry out signal transmission.
2. the new user's otherness selection cut-in method according to claim 1 for being applicable in non-orthogonal multiple system, feature
It is the sequence described in step 3 according to step 2, sequentially calculates all candidate use in all sub-bands for meeting bandwidth demand
The Signal to Interference plus Noise Ratio difference at family, and judge whether to meet:
|SINRi+1-SINRj+1|>10dB
The specific method for recording all candidate user numbers for meeting the condition is:
Step 3 one, by the candidate user in sub-band l according toSequence from small to large is arranged；
hiIndicate candidate user i respective channels gain；σiIndicate the noise power under candidate user i respective channels；
Step 3 two, according to formula:
Calculate the Signal to Interference plus Noise Ratio of each candidate userL is sub-band serial number；J is the serial number of candidate user；
In formula: βjIndicate the power allocation factor of j-th candidates user；P is the transmission power distributed on each sub-band；
Step 3 three, according to formula:
Calculate the difference of Signal to Interference plus Noise Ratio
Whether the difference that step 3 four, judgment step three or three obtain meets:
|SINRi+1-SINRj+1|>10dB
Step 3 five, record meet the candidate user number of step 3 four.
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| CN105554901B (en) * | 2015-12-11 | 2019-01-11 | 清华大学 | Accidental access method |
| CN106973430A (en) * | 2016-01-13 | 2017-07-21 | 索尼公司 | Electronic equipment, user equipment and wireless communications method in wireless communication system |
| CN105472752B (en) * | 2016-01-21 | 2019-05-28 | 清华大学 | A kind of uplink random cut-in method |
| CN107370563B (en) | 2016-05-13 | 2021-11-02 | 中兴通讯股份有限公司 | Information transmission method and device |
| CN106162846B (en) * | 2016-06-21 | 2017-05-10 | 华中科技大学 | Two-user NOMA (Non-Orthogonal Multiple Access) downlink energy efficiency optimization method in consideration of SIC (Successive Interference Cancellation) energy consumption |
| CN106211302A (en) * | 2016-07-12 | 2016-12-07 | 重庆邮电大学 | Non-orthogonal multiple accesses isomery UNE resource allocation methods |
| CN106162660A (en) * | 2016-07-22 | 2016-11-23 | 重庆邮电大学 | Isomery UNE federated user coupling and power distribution method |
| CN107645784A (en) * | 2016-07-22 | 2018-01-30 | 电信科学技术研究院 | Select the method and device of user's signature vector |
| CN107466097B (en) * | 2017-03-15 | 2020-08-28 | 中山大学 | Power distribution method of non-orthogonal multiple access system |
| CN107426808B (en) * | 2017-08-21 | 2020-11-06 | 北京工业大学 | Power distribution method for each user in down link in non-orthogonal multiple access technology |
| CN108512585B (en) * | 2018-04-04 | 2020-07-24 | 哈尔滨工业大学 | Dynamic cooperative relay transmission method based on power domain non-orthogonal multiple access technology |
| CN113891475A (en) * | 2021-10-22 | 2022-01-04 | 北京航天科工世纪卫星科技有限公司 | High-throughput satellite bandwidth self-adaptive distribution method |
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