CN102143588A - Resource-allocating method for multi-user multi-relay communication system - Google Patents

Resource-allocating method for multi-user multi-relay communication system Download PDF

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CN102143588A
CN102143588A CN2011100618570A CN201110061857A CN102143588A CN 102143588 A CN102143588 A CN 102143588A CN 2011100618570 A CN2011100618570 A CN 2011100618570A CN 201110061857 A CN201110061857 A CN 201110061857A CN 102143588 A CN102143588 A CN 102143588A
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subcarrier
user
base station
power
relay station
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杨绿溪
吴杨生
余辉
李春国
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Southeast University
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Abstract

The invention relates to the field of wireless communication and discloses a resource-allocating method for a multi-user multi-relay communication system. The resource-allocating method provided by the invention comprises the following steps of: providing a time division duplex downlink multi-user multi-relay system and allowing a base station sending end (base station) to serve multiple mobile user receiving ends (user) through relays. The system comprises K mobile user receiving ends and R relays. The band width of the system is B and a frequency-selective wideband channel is divided into N flat-fading channels by an orthogonal frequency division multiplexing (OFDM) technology. The base station sending end can serve K mobile user receiving ends through N orthogonal subchannels. Compared with the prior art, the invention has the advantages of higher frequency spectrum efficiency and no extra feedback expenditure. Both K and R are natural numbers and B is a positive rational number.

Description

The resource allocation methods of the many relay communications system of a kind of multi-user
Technical field
The present invention relates to wireless communication field, the resource allocation methods of the many relay communications system of particularly a kind of multi-user.
Background technology
Studies show that, the waste of the power resource that can reduce path loss effectively and caused based on the wireless communication network architecture of relay station, improve the availability of frequency spectrum, and can utilize the multi-hop of self-organizing ad hoc net to be communicated with the survivability energy that thought improves network, so network configuration and cooperation frequency multiplexing technique based on relay station have obtained broad research and concern, and have all considered how to introduce the problem of relaying collaborative process when the formulation of standards such as next-generation mobile communications, WLAN (wireless local area network) and broadband wireless network.
The relaying enhanced honeycomb system has improved the user communication quality of cell edge area and hot zones by the relaying subsidiary communications, has enlarged the sub-district area coverage, has increased the system spectral resources utilance simultaneously, has promoted the cellular communication system overall performance.Yet because the increase of relay station, traditional sub-district multi-subscriber dispatching and resource allocation algorithm are no longer suitable, the key issue that is designed to the research of relaying enhanced honeycomb system of novel algorithm.
How effectively the key issue of multi-user communication is the interference between process user, promptly how effectively to transmit each user's data.It is the standard technique that solves multiuser multiplexing in the next generation mobile communication system that OFDM inserts (OFDMA), by modulating in conjunction with OFDM, OFDMA makes a distinction user data on frequency range, broad-band channel is divided into the subchannel of a plurality of flat fadings, between the user on the different subchannels, just there is not any interference in theory, so just can effective transceive data.
Use the multi-user communication technology of OFDMA technology comparatively ripe, all considered the OFDMA technology when relating to the multi-user in the existing Long Term Evolution LTE-Advanced motion and existing, this scheme that multi-user communicationization is grouped into single telex network needs more bandwidth, and design problem mainly concentrates on the power division of the subcarrier allocation on upper strata and physical layer, and the adaptive power resource allocation plays an important role in collaborative network.
The present invention considers the many relay communications system of multi-user, unites problems such as considering subcarrier allocation, subcarrier pairing and power division, and comparing existing resource allocation algorithm has had obvious gain.
Summary of the invention
Technical problem:The resource allocation methods that the purpose of this invention is to provide the many relay communications system of a kind of multi-user makes the many relay communications system of multi-user obtain gratifying performance for wireless communications.
Technical scheme:Resource allocation methods in the many relay systems of multi-user may further comprise the steps:
A. the many relay communications system of multi-user by a base station transmitting terminal,
Figure 369996DEST_PATH_IMAGE001
Individual relay station and
Figure 745614DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal is formed, and the mobile subscriber is the double bounce user, wherein
Figure 431810DEST_PATH_IMAGE001
With Be natural number;
B. the base station transmitting terminal passes through Individual relay station service
Figure 549917DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal obtains the descending channel information CSI of two-hop link, and utilizes existing subcarrier allocation algorithm that second subcarrier allocation of jumping link is given
Figure 711908DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal;
C. the base station transmitting terminal is jumped downlink channel state information according to the second subcarrier allocation situation and first of jumping link, utilizes the subcarrier matching technology that first subcarrier allocation of jumping link is given
Figure 38984DEST_PATH_IMAGE001
Individual relay station;
D. under total power constraint, the base station transmitting terminal is the subcarrier allocation transmitting power of two-hop link according to the subcarrier allocation situation and the channel condition information of two-hop link;
E. first time slot, base station transmitting terminal are according to pre-assigned subcarrier and transmitting power, and the information that sends the mobile subscriber is to the corresponding relay station;
F. second time slot, each relay station receives the signal that base station transmitting terminal sends, and according to the second subcarrier allocation situation of jumping link, mobile subscriber's signal is transmitted in decoding;
G. the mobile subscriber receives the signal that relay station is transmitted, and decodes and handles accordingly.
Described relay station is decoding forward relay station; Described double bounce user's two-hop link all adopts the OFDM technology.
Described subcarrier allocation algorithm is the algorithm that turns to target with the power system capacity maximum.
Described subcarrier matching technology is respectively descending to be carried out in the sub-carrier channels gain of two-hop link, pairing one by one then.
Described distribution transmitting power is: adopting water-filling algorithm is to distribute to each user's the subcarrier of pairing to carrying out power division, the power division that subcarrier is right, as shown in the formula
Figure 261018DEST_PATH_IMAGE003
Wherein
Figure 407966DEST_PATH_IMAGE004
Be the right equivalent channel gain of n subcarrier and the ratio of receiving terminal noise, following formula separate for:
Figure 373648DEST_PATH_IMAGE005
, wherein
Figure 492914DEST_PATH_IMAGE006
Value need satisfy the total power constraint condition; P T Be total transmitted power.
Be respectively subcarrier allocation transmitted power on the two-hop link according to the double bounce channel condition again, expression formula is as follows:
Figure 948166DEST_PATH_IMAGE007
Figure 785672DEST_PATH_IMAGE008
Wherein
Figure 351782DEST_PATH_IMAGE009
Be the transmitted power of base station transmitting terminal on subcarrier m,
Figure 325555DEST_PATH_IMAGE010
The transmitted power of relay station r on subcarrier n,
Figure 951708DEST_PATH_IMAGE011
Right for distributing to k user's subcarrier
Figure 25579DEST_PATH_IMAGE012
Gross power,
Figure 395381DEST_PATH_IMAGE013
For relay station r to the signal to noise ratio of k user on subchannel n,
Figure 489239DEST_PATH_IMAGE014
For the base station transmitting terminal to the signal to noise ratio of relay station r on subchannel m.
Beneficial effect:Channel condition information (CSI) on each subcarrier of two-hop link can estimate that (TDD system) obtains by direct channels.The present invention compared with prior art has higher spectrum efficiency, and does not increase extra feedback overhead.
Description of drawings
Fig. 1 is many relay communications system of multi-user model,
Fig. 2 is the relation curve of many relay communications system of multi-user spectrum efficiency and signal to noise ratio,
The cumulative distribution function (CDF) of system spectral efficiency when Fig. 3 is a signal to noise ratio snr=20dB.
Embodiment
Embodiments of the present invention disclose the resource allocation methods of the many relay communications system of a kind of multi-user, comprise following steps: consider many relayings of multi-user downlink communication system of a time division duplex, base station transmitting terminal by relay station with
Figure 286293DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal communicates.Supposing the system has
Figure 832812DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal,
Figure 678409DEST_PATH_IMAGE001
Individual relay station, wherein
Figure 689090DEST_PATH_IMAGE002
With
Figure 594729DEST_PATH_IMAGE001
Be natural number.System bandwidth is
Figure 690861DEST_PATH_IMAGE015
, will be divided into
Figure 340148DEST_PATH_IMAGE016
Individual OFDM subcarrier, wherein
Figure 470915DEST_PATH_IMAGE015
Be rational,
Figure 547456DEST_PATH_IMAGE016
Be natural number.Base station transmitting terminal (base station) need pass through
Figure 865305DEST_PATH_IMAGE016
The subchannel of individual quadrature sends
Figure 318283DEST_PATH_IMAGE016
Individual data flow is given
Figure 303556DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal.Subcarrier of each scheduling can only be distributed to a mobile subscriber's receiving terminal (second time slot) and a relay station (first time slot), and relay station also can only forward by a subcarrier decoding of this relay station from the data that a subcarrier receives.Suppose that the total transmitted power of system is certain.
Figure 548068DEST_PATH_IMAGE017
The set of expression mobile subscriber receiving terminal,
Figure 353213DEST_PATH_IMAGE018
The set of expression relay station,
Figure 344303DEST_PATH_IMAGE019
The set of expression orthogonal sub-channels.For the subchannel of each slow fading, channel estimating is feasible, can suppose the known whole channel informations of base station transmitting terminal here, and initialization system is semiduplex, and therefore, communicating by letter between base station transmitting terminal and the mobile subscriber's receiving terminal needs two time slots.
Suppose that the base station transmitting terminal transmits data by subcarrier m and gives relay station r, relay station r transmits data by subcarrier n decoding again and gives mobile subscriber's receiving terminal k, ,
Figure 602426DEST_PATH_IMAGE021
,
Figure 98129DEST_PATH_IMAGE012
Be that to give the subcarrier of mobile subscriber's receiving terminal k right.
Figure 689648DEST_PATH_IMAGE009
Be the transmitted power of base station transmitting terminal on subcarrier m,
Figure 587197DEST_PATH_IMAGE010
The transmitted power of relay station r on subcarrier n.It is right to distribute to subcarrier
Figure 238758DEST_PATH_IMAGE012
Gross power be
Figure 956178DEST_PATH_IMAGE011
The one-sided power spectrum density of the additive white Gaussian noise of suppose relay station and mobile subscriber's receiving terminal all is ,
Figure 103443DEST_PATH_IMAGE023
With
Figure 925905DEST_PATH_IMAGE024
Represent respectively first hop channel at the channel gain on the subcarrier m and second hop channel channel gain on subcarrier n.So providing signal to noise ratio is defined as:
Figure 130621DEST_PATH_IMAGE025
,
Figure 270134DEST_PATH_IMAGE026
Can derive the momentary output of these two time slots:
Figure 939013DEST_PATH_IMAGE027
With
Then the base station transmitting terminal is right by subchannel
Figure 624389DEST_PATH_IMAGE012
Capacity to mobile subscriber's receiving terminal k can be expressed as:
Figure 564664DEST_PATH_IMAGE029
To turn to target with the power system capacity maximum below and carry out resource allocation, and at this moment, can be problem definition:
Figure 88049DEST_PATH_IMAGE030
Wherein
Figure 189997DEST_PATH_IMAGE031
Be meant the right set of subcarrier of distributing to mobile subscriber's receiving terminal k,
Figure 369306DEST_PATH_IMAGE032
It is total system's transmitted power.
Under total power constraint, make
Figure 910008DEST_PATH_IMAGE033
Maximum must have
Figure 225583DEST_PATH_IMAGE034
Therefore have
Figure 826329DEST_PATH_IMAGE007
Figure 227354DEST_PATH_IMAGE008
Then
Figure 571748DEST_PATH_IMAGE033
Maximum can be expressed as:
Figure 741829DEST_PATH_IMAGE035
So problem can redefine into:
Figure 513476DEST_PATH_IMAGE036
At the problems referred to above, the present invention provides following concrete implementation step:
The many relay communications system of multi-user by a base station transmitting terminal,
Figure 398868DEST_PATH_IMAGE001
Individual relay station and
Figure 219057DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal is formed, and the mobile subscriber is the double bounce user, wherein
Figure 571541DEST_PATH_IMAGE001
With
Figure 451772DEST_PATH_IMAGE002
Be natural number;
2. the channel condition information (CSI) on each subcarrier of two-hop link can estimate that all (TDD system) obtains by direct channels;
3. jump the channel gain of each subchannel of link according to second of gained, each subcarrier allocation of second time slot given at the best mobile subscriber's receiving terminal of this subcarrier upper signal channel gain,
4. under the situation that the subcarrier of second time slot has been distributed, carry out the subcarrier pairing.Application comparison ranking method sorts to the subcarrier of two-hop link, pairing one by one then,
5. through after the pairing of subcarrier allocation and subcarrier, to subcarrier to carrying out power division, as shown in the formula:
Figure 889706DEST_PATH_IMAGE003
Wherein,
Figure 513586DEST_PATH_IMAGE004
Be the right equivalent channel gain of n subcarrier and the ratio of receiving terminal noise, Be total system's transmitted power, following formula separate for
Figure 771709DEST_PATH_IMAGE005
After obtaining the right power of each subcarrier, again according to formula
Figure 634623DEST_PATH_IMAGE007
And formula
Figure 858931DEST_PATH_IMAGE008
Subcarrier on the two-hop link is carried out power division,
The base station transmitting terminal at first according to the resource information allocated in advance to
Figure 123690DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal transmission data are transmitted through the decoding of relay station again, and last mobile subscriber's receiving terminal receives data on for the subchannel of its distribution.
Fig. 2 has compared algorithm of the present invention and existing document (G. Liu, H. Liu.On the capacity of broadband relay networks[C] .in Proc. IEEE ACSSC ' 2004, Pacific Grove, USA, 2004:1318 – 1322) spectrum efficiency under different signal to noise ratios, Fig. 3 is the accumulated probability distribution curve of the spectrum efficiency of two kinds of algorithms, and as can be seen, algorithm performance of the present invention is much better than existing algorithm.

Claims (5)

1. the resource allocation methods of the many relay communications system of multi-user is characterized in that this method may further comprise the steps:
A. the many relay communications system of multi-user by a base station transmitting terminal,
Figure 608538DEST_PATH_IMAGE001
Individual relay station and
Figure 436817DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal is formed, and the mobile subscriber is the double bounce user, wherein
Figure 171555DEST_PATH_IMAGE001
With
Figure 718074DEST_PATH_IMAGE002
Be natural number;
B. the base station transmitting terminal passes through
Figure 891566DEST_PATH_IMAGE001
Individual relay station service
Figure 831142DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal obtains the descending channel information CSI of two-hop link, and utilizes existing subcarrier allocation algorithm that second subcarrier allocation of jumping link is given
Figure 799098DEST_PATH_IMAGE002
Individual mobile subscriber's receiving terminal;
C. the base station transmitting terminal is jumped downlink channel state information according to the second subcarrier allocation situation and first of jumping link, utilizes the subcarrier matching technology that first subcarrier allocation of jumping link is given
Figure 832913DEST_PATH_IMAGE001
Individual relay station;
D. under total power constraint, the base station transmitting terminal is the subcarrier allocation transmitting power of two-hop link according to the subcarrier allocation situation and the channel condition information of two-hop link;
E. first time slot, base station transmitting terminal are according to pre-assigned subcarrier and transmitting power, and the information that sends the mobile subscriber is to the corresponding relay station;
F. second time slot, each relay station receives the signal that base station transmitting terminal sends, and according to the second subcarrier allocation situation of jumping link, mobile subscriber's signal is transmitted in decoding;
G. the mobile subscriber receives the signal that relay station is transmitted, and decodes and handles accordingly.
2. the resource allocation methods of the many relay communications system of multi-user according to claim 1 is characterized in that,
Described relay station is decoding forward relay station; Described double bounce user's two-hop link all adopts the OFDM technology.
3. the resource allocation methods of the many relay communications system of multi-user according to claim 1 is characterized in that,
Described subcarrier allocation algorithm is the algorithm that turns to target with the power system capacity maximum.
4. the resource allocation methods of the many relay communications system of multi-user according to claim 1 is characterized in that,
Described subcarrier matching technology is respectively descending to be carried out in the sub-carrier channels gain of two-hop link, pairing one by one then.
5. the resource allocation methods of the many relay communications system of multi-user according to claim 1 is characterized in that,
Described distribution transmitting power is: adopting water-filling algorithm is to distribute to each user's the subcarrier of pairing to carrying out power division, the power division that subcarrier is right, as shown in the formula
Wherein
Figure 347388DEST_PATH_IMAGE004
Be the right equivalent channel gain of n subcarrier and the ratio of receiving terminal noise, following formula separate for:
Figure 486245DEST_PATH_IMAGE005
, wherein
Figure 7356DEST_PATH_IMAGE006
Value need satisfy the total power constraint condition; P T Be total transmitted power.
Be respectively subcarrier allocation transmitted power on the two-hop link according to the double bounce channel condition again, expression formula is as follows:
Figure 257072DEST_PATH_IMAGE007
Figure 180029DEST_PATH_IMAGE008
Wherein
Figure 427470DEST_PATH_IMAGE009
Be the transmitted power of base station transmitting terminal on subcarrier m,
Figure 498195DEST_PATH_IMAGE010
The transmitted power of relay station r on subcarrier n,
Figure 489284DEST_PATH_IMAGE011
Right for distributing to k user's subcarrier
Figure 329064DEST_PATH_IMAGE012
Gross power, For relay station r to the signal to noise ratio of k user on subchannel n,
Figure 39848DEST_PATH_IMAGE014
For the base station transmitting terminal to the signal to noise ratio of relay station r on subchannel m.
CN2011100618570A 2011-03-15 2011-03-15 Resource-allocating method for multi-user multi-relay communication system Pending CN102143588A (en)

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WO2019206080A1 (en) * 2018-04-26 2019-10-31 华为技术有限公司 Channel resource coordination and allocation method and apparatus
CN111132189A (en) * 2019-10-31 2020-05-08 广西华南通信股份有限公司 Three-step multi-carrier wireless forwarding station resource optimization configuration strategy

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WO2012155491A1 (en) * 2011-08-08 2012-11-22 中兴通讯股份有限公司 Method, device and base station for controlling configuration of channel resources
CN102333062B (en) * 2011-10-18 2014-04-02 清华大学 OFDM (Orthogonal Frequency Division Multiplex) bidirectional information interactive transmission method oriented to user fairness
CN102333062A (en) * 2011-10-18 2012-01-25 清华大学 OFDM (Orthogonal Frequency Division Multiplex) bidirectional information interactive transmission method oriented to user fairness
CN103138895A (en) * 2011-12-02 2013-06-05 联发科技（新加坡）私人有限公司 Wireless communication system and method for performing operation of the same
US9521622B2 (en) 2011-12-02 2016-12-13 Mediatek Singapore Pte. Ltd. Non-codebook based precoding for multi-user MIMO downlink
CN103138895B (en) * 2011-12-02 2016-12-21 联发科技（新加坡）私人有限公司 Wireless communication system and the method performing wireless communication system operation
CN103068027A (en) * 2012-12-07 2013-04-24 南京邮电大学 Optimal power distribution method of multiple relays in frequency flat fading channel
CN103068027B (en) * 2012-12-07 2015-04-01 南京邮电大学 Optimal power distribution method of multiple relays in frequency flat fading channel
CN107155210A (en) * 2016-03-04 2017-09-12 海能达通信股份有限公司 Poewr control method and node apparatus
WO2017148448A1 (en) * 2016-03-04 2017-09-08 海能达通信股份有限公司 Power control method and node device
CN106357376A (en) * 2016-08-29 2017-01-25 东南大学 ARQ feedback based resource allocation scheme for relay cooperative underwater acoustic communication system
CN106357376B (en) * 2016-08-29 2019-08-13 东南大学 Resource allocation methods of the relay cooperative underwater sound communication system based on ARQ feedback
WO2019206080A1 (en) * 2018-04-26 2019-10-31 华为技术有限公司 Channel resource coordination and allocation method and apparatus
CN109450513A (en) * 2018-10-17 2019-03-08 扬州大学 The more relay system transmission methods of cooperation based on non-orthogonal multiple access technology
CN111132189A (en) * 2019-10-31 2020-05-08 广西华南通信股份有限公司 Three-step multi-carrier wireless forwarding station resource optimization configuration strategy
CN111132189B (en) * 2019-10-31 2022-07-29 广西华南通信股份有限公司 Three-step multi-carrier wireless forwarding station resource optimal configuration method

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Application publication date: 20110803