CN103997761A - Optimal frame length selection method of downlink communication of multi-user MIMO system - Google Patents
Optimal frame length selection method of downlink communication of multi-user MIMO system Download PDFInfo
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- CN103997761A CN103997761A CN201410214968.4A CN201410214968A CN103997761A CN 103997761 A CN103997761 A CN 103997761A CN 201410214968 A CN201410214968 A CN 201410214968A CN 103997761 A CN103997761 A CN 103997761A
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Abstract
The invention provides an optimal frame length selection method of downlink communication of a multi-user MIMO system. The largest time delay default probability constraints of all users in the system are fed back to a central control node; according to the statistic channel state information of all the users and the demand information fed back by all the users, the optimal frame lengths required by all the users are calculated by the central control node on the premise that the largest time delay default probability constraints are guaranteed; the largest frame length is selected from the optical frame length set by the central control node to be used as the optimal frame length of the system. Through the method, the relations between the largest time delay default probability constraints of the users and the frame length of the system as well as between the largest time delay default probability constraints of the users and the average rate of the users can be quantitatively reflected, and the selected optimal frame length of the system can effectively guarantee the time delay demands of all the users.
Description
Technical field
The invention belongs to wireless communication technology field, be specifically related to a kind of optimum frame length system of selection of multi-user MIMO system downlink communication.
Background technology
In the key technology research of multi-antenna broadcast system, it is one of its emphasis that the frame length of How to choose optimum carries out transfer of data, and optimum frame length is selected effectively to tackle bursty data business, ensure each user's time delay demand, thereby further improve the throughput of system.
System frame length in multi-antenna broadcast system has very important impact to the effective throughput of system.On the one hand, shorter frame length makes scheduler can excavate better multi-user diversity, but in short frame, relatively large control information proportion can consume more system resource, thereby brings the decline of throughput of system.On the other hand, longer system frame length can bring the lifting of throughput of system, but for changing channel faster in multi-antenna broadcast system, longer system frame length can make scheduler can not follow well the variation of channel, thereby causes the loss of multi-user diversity.Therefore, need to design a kind of optimum frame length system of selection for multi-antenna broadcast system, thus elevator system resource utilization better.
Summary of the invention
The invention provides a kind of optimum frame length system of selection of multi-user MIMO system downlink communication.This method can reflect the relation between the constraint of user's maximum delay Default Probability and system frame length and user's Mean Speed quantitatively, and selected system optimal frame length can ensure each user's maximum delay Default Probability constraint demand effectively.
For solving the problems of the technologies described above, the invention provides a kind of optimum frame length system of selection of multi-user MIMO system downlink communication, the method comprising the steps of: its maximum delay Default Probability constraint is fed back to center control nodes by each user; Center control nodes, according to each user's statistical channel state information, is that each user calculates required optimum frame length in conjunction with the demand information of each user feedback; Center control nodes is selected the optimum frame length of maximum frame length as system in aforementioned optimum frame length set.
Described optimum frame length system of selection utilizes the concept such as effective bandwidth and available capacity, be the constraint that comprises frame length and user's Mean Speed by user's maximum delay Default Probability constraints conversion, and solve user's Mean Speed by user's statistical channel state information, thereby obtain optimum frame length.
Described system optimal frame length refers to meet the frame length of all user's maximum delay Default Probability constraints, is the maximum of the required optimum frame length of each user in the method.
With respect to prior art, beneficial effect of the present invention:
The present invention considers each user's channel statistical channel condition information and the maximum delay Default Probability of each user feedback constraint demand, reflect quantitatively the relation between the constraint of user's maximum delay Default Probability and system frame length and user's Mean Speed, can ensure each user's time delay demand by the selection of optimum frame length.
Brief description of the drawings
Fig. 1 is the optimum frame length selection course flow chart of multi-user MIMO system downlink communication.
Embodiment
The optimum frame length system of selection of multi-user MIMO system downlink communication, the method comprising the steps of: its maximum delay Default Probability constraint is fed back to center control nodes by each user; Center control nodes, according to each user's statistical channel state information, is that each user calculates required optimum frame length in conjunction with the demand information of each user feedback; Center control nodes is selected the optimum frame length of maximum frame length as system in aforementioned optimum frame length set.
Described optimum frame length system of selection utilizes the concept such as effective bandwidth and available capacity, be the constraint that comprises frame length and user's Mean Speed by user's maximum delay Default Probability constraints conversion, and solve user's Mean Speed by user's statistical channel state information, thereby obtain optimum frame length.
Described system optimal frame length refers to meet the frame length of all user's maximum delay Default Probability constraints, calculates in the method the maximum of required optimum frame length for each user.
In conjunction with formula and accompanying drawing, the present invention program is designed and does further concrete analysis and describe.
Consider K user multi-antenna broadcast system, suppose that center control nodes is furnished with M
ttransmit antennas, each user side is furnished with N
k0 antenna.If H
kfor the channel matrix of user k, order
for the cumulative channel matrix of user k.Right
divide and solve as QR:
And make user k equivalent channel matrix
's
individual singular value is
It is Q=[q that tentation data source business arrival process can be modeled as transfer matrix
1, 1-q
1; 1-q
2, q
2] two-state ON-OFF markoff process, wherein q
1and q
2represent respectively the transition probability from ON to OFF and from OFF to ON.If each data source is α by obeying parameter under ON state
kindependent Poisson process to produce size be N
bpacket, and countless according to packet generation under OFF state.
Make D
kcentered by control the average delay of Nodes corresponding to each packet in the data buffer storage of user k,
for the maximum average delay that user k allows, the constraint of the maximum delay Default Probability of user k can be expressed as
Wherein ε
kfor given threshold value.
Based on above-mentioned model, the optimum frame length system of selection of described multi-user MIMO system downlink communication is described as shown in Figure 1:
1), for user k, it meets the optimum frame length T of maximum delay Default Probability constraint
kfor equation
Solution.Wherein B is system bandwidth, δ
kfor the shared duration of control information in user k Frame, R
kfor the obtainable message transmission rate of user k,
for equation
Solution.
with
for the expression formula of described effective bandwidth and available capacity, that is:
Wherein β (z
k)=p
k, 1+ p
k, 2g
k(z
k), η (z
k)=(1-p
k, 1-p
k, 2) G
k(z
k), G
k(z
k)=exp (α
kexp (z
kn
b-1)).Described in equation (3) and (5), expect to be calculated as follows:
Wherein f
λ(λ) be singular value
joint probability density function.
2) system optimal frame length refers to meet the frame length of all user's maximum delay Default Probability constraints, is above-mentioned all optimum frame length T in the method
k, k=1 ..., K, has
T＝max{T
1，...，T
K} (7)
The foregoing is only preferred embodiments of the present invention; protection scope of the present invention is not limited with above-mentioned execution mode; in every case the equivalence that those of ordinary skill in the art do according to disclosed content is modified or is changed, and all should include in the protection range of recording in claims.
Claims (2)
1. an optimum frame length system of selection for multi-user MIMO system downlink communication, comprises step: its maximum delay Default Probability (delay-bound violation probability) constraint is fed back to center control nodes by each user; Center control nodes, according to each user's statistical channel state information, is that each user calculates required optimum frame length in conjunction with the demand information of each user feedback; Center control nodes is selected the optimum frame length of maximum frame length as system in aforementioned optimum frame length set.
2. the optimum frame length system of selection of multi-user MIMO system downlink communication according to claim 1, described optimum frame length system of selection utilizes the concept such as effective bandwidth (effective bandwidth) and available capacity (effective capacity), be the constraint that comprises frame length and user's Mean Speed by user's maximum delay Default Probability constraints conversion, and solve user's Mean Speed by user's statistical channel state information, thereby obtain optimum frame length.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530696A (en) * | 2015-12-11 | 2016-04-27 | 航天恒星科技有限公司 | Multi-user interference elimination method and system |
| CN106533521A (en) * | 2016-12-12 | 2017-03-22 | 江南大学 | Method for pre-coding LR-RZF large-scale MIMO system based on truncated series expansion |
| CN114928757A (en) * | 2022-07-21 | 2022-08-19 | 中国科学技术大学 | 360-degree VR video data transmission method and device based on millimeter waves |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060270343A1 (en) * | 2005-04-07 | 2006-11-30 | Interdigital Technology Corporation | Method and apparatus for antenna mapping selection in MIMO-OFDM wireless networks |
| CN103037520A (en) * | 2011-03-25 | 2013-04-10 | 北京新岸线无线技术有限公司 | Resource scheduling method and resource scheduling device |
-
2014
- 2014-05-20 CN CN201410214968.4A patent/CN103997761A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060270343A1 (en) * | 2005-04-07 | 2006-11-30 | Interdigital Technology Corporation | Method and apparatus for antenna mapping selection in MIMO-OFDM wireless networks |
| CN103037520A (en) * | 2011-03-25 | 2013-04-10 | 北京新岸线无线技术有限公司 | Resource scheduling method and resource scheduling device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530696A (en) * | 2015-12-11 | 2016-04-27 | 航天恒星科技有限公司 | Multi-user interference elimination method and system |
| CN105530696B (en) * | 2015-12-11 | 2020-07-31 | 航天恒星科技有限公司 | Multi-user interference elimination method and system |
| CN106533521A (en) * | 2016-12-12 | 2017-03-22 | 江南大学 | Method for pre-coding LR-RZF large-scale MIMO system based on truncated series expansion |
| CN106533521B (en) * | 2016-12-12 | 2019-08-06 | 江南大学 | A kind of extensive mimo system method for precoding of LR-RZF based on truncation series expansion |
| CN114928757A (en) * | 2022-07-21 | 2022-08-19 | 中国科学技术大学 | 360-degree VR video data transmission method and device based on millimeter waves |
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