CN106686710B - A kind of downlink NOMA power distribution method considering imperfect SIC - Google Patents
A kind of downlink NOMA power distribution method considering imperfect SIC Download PDFInfo
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- CN106686710B CN106686710B CN201710050415.3A CN201710050415A CN106686710B CN 106686710 B CN106686710 B CN 106686710B CN 201710050415 A CN201710050415 A CN 201710050415A CN 106686710 B CN106686710 B CN 106686710B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
Abstract
Imperfect SIC (serial interference elimination is considered the invention discloses a kind of, Successive Interference Cancellation) downlink NOMA (non-orthogonal multiple access, Non-Orthogonal Multiple Access) power distribution method.Have the characteristics that mobile terminal hardware is limited according to nonopiate multi-access systems, a kind of base station transmitting power distribution method is devised, to reduce the interference suffered when mobile terminal carries out serial interference elimination, to improve the performance of system.Base station is ranked up the channel gain of mobile terminal, then random power distribution and supercomposed coding several times are carried out, mobile terminal carries out corresponding SIC decoding and imperfect SIC long-term statistical information is then fed back to base station to obtain imperfect SIC long-term statistical information.The statistical information that base station is sorted and fed back according to channel gain is transmitting signal distribution power, is then overlapped coding to the transmitting signal of each mobile terminal.The present invention provides a kind of simple effective power distribution method for the downlink NOMA system under imperfect SIC.
Description
Technical field
The present invention relates to wireless communication field more particularly to a kind of power distribution sides downlink NOMA for considering imperfect SIC
Method.
Background technique
With the fast development of Internet of Things, the extensive scene that accesses is following one of the scene certainly existed.Take tradition
CDMA, TDMA, OFDMA etc. accessed, and base station needs to distribute resource (code, time, frequency band) etc. for each user, due to
The following 5G communication system will support the connection of millions of different demands simultaneously, i.e., to realize that isomery accesses on a large scale, such one
The scene of a complexity can bring efficiency is too low, signaling overheads is excessive and complexity is excessive etc. using traditional multiple access mechanism
Problem.Therefore efficient nonopiate access system becomes current research hotspot.
NOMA (non-orthogonal multiple access, Non-Orthogonal Multiple Access) is folded by using in transmitting terminal
Add coding and in receiving end using SIC (serial interference elimination, Successive Interference Cancellation), makes
The same wireless resource block can be shared by obtaining the biggish mobile terminal of multiple channel gains differences, to effectively improve system frequency
Spectrum efficiency.However, strong channel user can not be complete by counteracting serial interference SIC technology due to mobile terminal hardware limitation
The interference from weak channel user is eliminated, and when the mobile terminal number of access is larger, strong channel user needs to carry out more
Secondary SIC operation, then the redundancy interference that the user is subject to will be very serious, this severely limits the performances of NOMA system.Power
Distribution is a kind of effective disturbance restraining method.In NOMA system, appropriate power distribution method should guarantee each mobile whole
There is gap in the equivalent channel gain at end, consequently facilitating distinguishing terminal and then execution SIC decoded operation, guarantee movement again each other
The fairness of terminal guarantees the minimal communications data rate of each user, finally on the basis of taking into account user fairness, most
Big degree improves the performance of NOMA system.Ding Zhiguo professor of Lancaster University, Britain et al. is in " On the
Performance of Non-Orthogonal Multiple Access in 5G Systems with Randomly
Deployed Users " in a text, a kind of fixed power distribution method is proposed, it has studied under two mobile terminals and is
System Mean Speed, applicability is not strong, and is based on perfection SIC, and practical directive significance is weaker.
Summary of the invention
The problems such as small the purpose of the present invention is to solve application range in above scheme, proposes that a kind of consideration is imperfect
The downlink NOMA power distribution method of SIC.
The technical solution adopted in the present invention is as follows:
The downlink NOMA power distribution method for considering imperfect SIC, includes the following steps:
1) base station is based on channel long-term statistical information, obtains the gain information of all down channels | hj|, j=1,2 ..., J
Wherein J is the quantity of mobile terminal；
2) according to the gain information of down channel, base station is arranged mobile terminal from big to small | h1|≥|h2|≥…
≥|hJ|；
3) base station carries out random power distribution first, according to random power distribution result, is overlapped volume to transmitting signal
Code；
4) according to base station supercomposed coding as a result, j-th of mobile terminal progress SIC decoding, obtains imperfect SIC and unite for a long time
Count information εj,i, i=j+1, j+2 ..., then imperfect SIC statistical information is fed back to base station by J；
5) the imperfect SIC statistical information that base station is fed back according to the gain information and mobile terminal of down channel is jth
A mobile terminal distributes transmission power；
6) according to power distribution result, base station is overlapped coding to transmitting signal.
The imperfect SIC long-term statistical information method of acquisition for mobile terminal in step 4) are as follows: base station carry out first several times with
Machine power distribution and supercomposed coding, mobile terminal j decode the reception symbol s of mobile terminal i every timei, i=j+1, j+2 ..., J,
Final statistics obtains the residual interference power coefficient ε from mobile terminal ij,i, residual interference power coefficient is imperfect SIC
Long-term statistical information.
Base station power distribution method in step 5) are as follows: after mobile terminal feeds back imperfect SIC long-term statistical information, base
The transmission power that j-th of mobile terminal is distributed at station isIts
Middle piThe transmission power of mobile terminal i, ε are distributed to for base stationj,iIt is obtained for the mobile terminal j transmitting signal for decoding mobile terminal i
Imperfect SIC long-term statistical information, | hj| it is the channel gain information of j-th of mobile terminal, σ2For noise power, rjTo move
Minimum data rate required for dynamic terminal j.
Supercomposed coding method in step 6) are as follows: base station carries out following superposition to the transmitting signal of each mobile terminal and compiles
Code,Wherein sjIt is the signal of j-th of mobile terminal, pjIt is the power of j-th of mobile terminal, x is base station
Transmitting signal after supercomposed coding.
The invention has the advantages that: the present invention proposes long-term using down channel gain information and imperfect SIC
Statistical information is that downlink NOMA system carries out power distribution, and gives the closed expression of power distribution, therefore have lower
Design complexities and stronger practical directive significance.In addition, this power distribution method is suitable for arbitrary number mobile terminal
The case where, there is wide applicability.
Detailed description of the invention
Fig. 1 is the block diagram for considering the downlink NOMA power distribution method of imperfect SIC；
Fig. 2 is that the performance under different capacity distribution method compares；
Fig. 3 is influence of the imperfect SIC to power distribution method；
Specific embodiment
Consider that the block diagram of the downlink NOMA power distribution method of imperfect SIC is as shown in Figure 1.Base station is according under obtained
Row channel gain information, mobile terminal is sorted.Base station carries out random power distribution first, is overlapped volume to transmitting signal
Code, mobile terminal carry out SIC decoding, obtain imperfect SIC long-term statistical information and statistical information is then fed back to base station.In conjunction with
Channel gain information and imperfect SIC long-term statistical information, base station is that each mobile terminal distributes transmission power, then to each
The signal of mobile terminal is overlapped coding.
The downlink NOMA power distribution method for considering imperfect SIC, specifically comprises the following steps:
1) base station is based on channel long-term statistical information, obtains the gain information of all down channels | hj|, j=1,2 ..., J
Wherein J is the quantity of mobile terminal；
2) according to the gain information of down channel, base station is arranged mobile terminal from big to small | h1|≥|h2|≥…
≥|hJ|；
3) base station carries out random power distribution first, according to random power distribution result, is overlapped volume to transmitting signal
Code；
4) according to base station supercomposed coding as a result, j-th of mobile terminal progress SIC decoding, obtains imperfect SIC and unite for a long time
Count information εj,i, i=j+1, j+2 ..., then imperfect SIC statistical information is fed back to base station by J；
5) the imperfect SIC statistical information that base station is fed back according to the gain information and mobile terminal of down channel is jth
A mobile terminal distributes transmission power；
6) according to power distribution result, base station is overlapped coding to transmitting signal.
In the above method, part steps are specific as follows:
The imperfect SIC long-term statistical information method of acquisition for mobile terminal in step 4) are as follows: base station carry out first several times with
Machine power distribution and supercomposed coding, mobile terminal j decode the reception symbol s of mobile terminal i every timei, i=j+1, j+2 ..., J,
Final statistics obtains the residual interference power coefficient ε from mobile terminal ij,i, residual interference power coefficient is imperfect SIC
Long-term statistical information.
Base station power distribution method in step 5) are as follows: after mobile terminal feeds back imperfect SIC long-term statistical information, base
The transmission power that j-th of mobile terminal is distributed at station isIts
Middle piThe transmission power of mobile terminal i, ε are distributed to for base stationj,iIt is obtained for the mobile terminal j transmitting signal for decoding mobile terminal i
Imperfect SIC long-term statistical information, | hj| it is the channel gain information of j-th of mobile terminal, σ2For noise power, rjTo move
Minimum data rate required for dynamic terminal j.
Supercomposed coding method in step 6) are as follows: base station carries out following superposition to the transmitting signal of each mobile terminal and compiles
Code,Wherein sjIt is the signal of j-th of mobile terminal, pjIt is the power of j-th of mobile terminal, x is base station
Transmitting signal after supercomposed coding.
Shown as shown in Figures 2 and 3 by Computer Simulation, the downlink NOMA proposed by the present invention for considering imperfect SIC
Power distribution method can obtain bright than traditional constant power distribution method and existing fixed NOMA power distribution method
Aobvious performance gain, in addition, present invention demonstrates that minimum data rate to guarantee each user, minimum power needed for system with
The increase of imperfect SIC and it is linearly increasing.Therefore, power distribution method proposed by the invention provides for downlink NOMA system
Very actual theoretical direction.
Claims (3)
1. a kind of downlink NOMA power distribution method for considering imperfect SIC, it is characterised in that include the following steps:
1) base station is based on channel long-term statistical information, obtains the gain information of all down channels | hj|, j=1,2 ..., J, wherein
J is the quantity of mobile terminal；
2) according to the gain information of down channel, base station is arranged mobile terminal from big to small | h1|≥|h2|≥…≥|hJ
|；
3) base station carries out random power distribution first, according to random power distribution result, is overlapped coding to transmitting signal；
4) according to base station supercomposed coding as a result, j-th of mobile terminal progress SIC decoding, obtains imperfect SIC long-time statistical letter
Cease εJ, i, i=j+1, j+2 ..., then imperfect SIC statistical information feeds back to base station by J；
5) the imperfect SIC statistical information that base station is fed back according to the gain information and mobile terminal of down channel, it is mobile for j-th
Terminal distribution transmission power；Wherein base station power distribution method are as follows: after mobile terminal feeds back imperfect SIC long-term statistical information,
The transmission power that j-th of mobile terminal is distributed in base station isIts
Middle piThe transmission power of mobile terminal i, ε are distributed to for base stationJ, iIt is obtained for the mobile terminal j transmitting signal for decoding mobile terminal i
Imperfect SIC long-term statistical information, | hj| it is the channel gain information of j-th of mobile terminal, σ2For noise power, rjTo move
Minimum data rate required for dynamic terminal j；
6) according to power distribution result, base station is overlapped coding to transmitting signal.
2. a kind of downlink NOMA power distribution method for considering imperfect SIC according to claim 1, it is characterized in that step
4) the imperfect SIC long-term statistical information method of acquisition for mobile terminal in are as follows: base station carry out first several times random power distribution and
Supercomposed coding, mobile terminal j decode the reception symbol s of mobile terminal i every timei, i=j+1, j+2 ..., J, final statistics acquisition
Residual interference power coefficient ε from mobile terminal iJ, i, residual interference power coefficient is imperfect SIC long-term statistical information.
3. a kind of downlink NOMA power distribution method for considering imperfect SIC according to claim 1, it is characterized in that step
6) supercomposed coding method in are as follows: base station carries out following supercomposed coding to the transmitting signal of each mobile terminal,Wherein sjIt is the signal of j-th of mobile terminal, pjIt is the power of j-th of mobile terminal, x is that base station is folded
Transmitting signal after adding coding.
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| CN108650689B (en) * | 2018-04-03 | 2020-09-22 | 华南理工大学 | Energy efficiency optimization method of wireless energy-carrying communication system based on NOMA downlink |
| CN108882352B (en) * | 2018-05-29 | 2021-03-12 | 南京邮电大学 | Non-perfect SIC (SIC) -based optimal weight rate downlink NOMA (non-orthogonal multiple access) power distribution method |
| CN108924935A (en) * | 2018-07-06 | 2018-11-30 | 西北工业大学 | A kind of power distribution method in NOMA based on nitrification enhancement power domain |
Citations (2)
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| CN105471543A (en) * | 2014-08-01 | 2016-04-06 | 株式会社Ntt都科摩 | Transmitting device and transmitting method |
| CN106341878A (en) * | 2016-08-25 | 2017-01-18 | 重庆邮电大学 | Low-complexity NOMA system power allocation method |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471543A (en) * | 2014-08-01 | 2016-04-06 | 株式会社Ntt都科摩 | Transmitting device and transmitting method |
| CN106341878A (en) * | 2016-08-25 | 2017-01-18 | 重庆邮电大学 | Low-complexity NOMA system power allocation method |
Non-Patent Citations (3)
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| On the performance of perfect and imperfect SIC in downlink non orthogonal multiple access (NOMA);Muhammad Rehan Usman,et al.;《IEEE Xplore Digital Library》;20161008;全文 * |
| 非正交多址系统功率分配及干扰消除算法研究;张德坤;《中国优秀硕士学位论文全文数据库，信息科技辑》;20160215;全文 * |
| 面向5G的非正交多址接入技术（NOMA）浅析;张长青;《无线通信》;20151130;全文 * |
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