CN101193441A - Integrated sub-channel and power distribution method and device in cell relay system - Google Patents

Abstract

According to the invention, a device based on a comprehensive sub channel in a cell relay system of an orthogonal frequency division multiple access and power assignment is provided. The device comprises: a plurality of user sides which feeds back channel gain measured in every sub channel to a base station through each relay station; the each relay station and a base station. which ensures a return power ratio in every sub channel of every user side according to channel gain in every sub channel feed back from every user side, and then according to the selected user sides and sub channels which have the best return power ratio, updates the transmission power in the selected sub channels of every relay station and the modulation mode in the selected sub channels of the selected user sides step by step, renews the return power ratio in every sub channel of every user side to ensure the final sub channel and power assignment proposal.

Description

Integrated sub-channel in the relay system of sub-district and power distribution method and equipment

Technical field

The present invention relates to moving communicating field, more specifically, relate to a kind of based on the integrated sub-channel in the sub-district relay system of OFDM and power distribution method and equipment, in order to the throughput and the fairness of elevator system.

Background technology

Along with the mobile user data business popularize and future mobile communication system is main attraction with video flowing, mobile operator is faced with the throughput that offers user's better service quality and Geng Gao.The scarcity of frequency spectrum resource makes that increasing cell density becomes the raising availability of frequency spectrum, a more important means of high-throughput is provided.Yet base station equipment generally all compares expensive, uses the sub-district relaying to substitute the part base station and has become a comparatively desirable solution.The sub-district relay system has all obtained paying attention to and research a plurality of organizing such as 3GPP LTE, WWRF and IEEE 802.16, wherein IEEE 802.16 working groups have set up mobile multi-hop relaying (16MMR) seminar, and this seminar is relay task group 802.16j in March, 2006 by official approval.Because the advance of OFDM OFDMA, the unique physical-layer techniques of OFDM OFDMA as relaying selected by 802.16j relaying working group.

In order to reduce the interference between the different relayings of frequency reuse system, tradition adopts the mode of frequency planning,, gives the adjacent different frequency of relay distribution that is.Though this mode can reduce interference effectively, with the also reduction greatly thereupon of utilance of time-frequency spectrum.Because the scarcity of frequency spectrum resource, it is 1 scheme that mobile operator more and more tends to adopt frequency duplex factor as one, that is, all relayings all use all mandate frequency ranges.As previously mentioned, this mode makes from there being bigger interference between the adjacent relaying.Power division is selected suitable transmission power according to relaying and user's channel conditions and from the disturbance regime of other relayings, compares and adopts equal-wattage to launch, and power division can reduce the interference from adjacent relaying to a great extent.

Because the multipath characteristics of wireless signal, the signal power of the different frequency that same position receives also exists certain difference, and this species diversity is called the frequency selectivity diversity.The frequency selectivity diversity has caused in a plurality of available subchannels, and some subchannels will be significantly better than the other subchannel.It is the reasonable distribution subchannel that subchannel distributes purpose, makes each user can both use subchannel preferably as far as possible, thereby improves the performance of whole system.

Aspect the subcarrier and subchannel distribution of OFDMA, some research work are arranged at present.In these work, some distributes according to the signal to noise ratio of the signal that receives, and some distributes according to frequency duplex factor as one.Aspect the power control of OFDMA many work is being arranged also, some is operated between the different subchannels distributes power, makes the signal to noise ratio of overall system reach optimum, and perhaps the throughput of system reaches maximum.Some work is controlled the interference that reduces between a plurality of sub-districts by power, makes under the prerequisite that satisfies user's signal to noise ratio or throughput, and it is minimum that the gross power of system reaches.Some work is divided into one by one time slot to the time, disturbs less time slot to carry out power division for those, makes less to the interference ratio of neighbor cell.

In comprising the sub-district of trunk desk, lack the solution of considering that simultaneously power division and subchannel distribute at present.Our analog result shows, the present invention considers when proposing that both solutions will be much better than one of them solution of independent consideration.Specifically, solution of the present invention can provide comparatively significant throughput of system and user fairness gain simultaneously than existing scheme.

It all is the means that more effectively increase throughput of system, promote fairness that power division and subchannel distribute.Power division is used as far as possible little transmitting power satisfying under the condition that the user receives signal interference ratio, thereby reduces the interference to adjacent relaying.From the viewpoint of whole system, the interference between the reduction relaying then means the lifting of throughput of system.Subchannel distributes the channel of attempting better performances to each user divides this user of pairing, thereby promotes the performance of whole system.The present invention is with these two kinds of good merging of means, and any one can both obtain better system performance compared with independent use.

Summary of the invention

In order to overcome above-mentioned defective the present invention has been proposed.The objective of the invention is to propose a kind of based on the integrated sub-channel in the sub-district relay system of OFDM and power distribution method and equipment, in order to the throughput and the fairness of elevator system.

To achieve these goals, according to the present invention, proposed a kind ofly based on integrated sub-channel and power distribution apparatus in the sub-district relay system of OFDM, comprising: a plurality of user sides feed back to the base station with the channel gain on each subchannel that measures by each trunk desk; Each trunk desk; The income power ratio of each user side on each subchannel according to the channel gain on each next subchannel of each client feeds back, determined in the base station; From all user sides of whole sub-district and subchannel, select user side and subchannel with optimum income power ratio; Before the distribution power of each current trunk desk is no more than system's gross power restriction, described base station is according to selected user side and subchannel with optimum income power ratio, upgrade step by step each trunk desk in through-put power on the selected subchannel and selected user side the modulation system on selected subchannel, and upgrade the income power ratio of each user side on each subchannel, to determine final subchannel and power allocation scheme.

Preferably, described user side comprises: the pilot reception module receives and sends pilot signal from trunk desk; The channel gain computing module receives the channel gain on each subchannel of ionization meter of pilot signal according to the pilot reception module; And feedback module, the channel gain that measures is fed back to trunk desk.

Preferably, described trunk desk comprises: the pilot tone sending module sends pilot tone to user side; The channel gain receiver module receives the channel gain that client feeds back is come; Feedback module sends described channel gain to the base station of sub-district; The allocative decision receiver module receives final subchannel and the power allocation scheme that send described base station; And allocative decision implements module, the distribution that final subchannel of sending according to described base station and power allocation scheme are determined subchannel and power.

Preferably, described base station comprises: the channel gain receiver module receives the channel gain that sends from trunk desk; Initialization module calculates the initial income power ratio of each user at each subchannel; Optimum income power ratio is selected module, is used for selecting user and the subchannel with optimum income power ratio from all users of whole sub-district and subchannel; The constraint judging module judges whether current allocation situation has violated the gross power restriction of system; If violate, then enable the allocative decision sending module, otherwise, enable power upgrading module; Power upgrading module, the through-put power of each trunk desk on the selected subchannel that goes out of upgrading; Modulation upgrading module, the modulation system of the selected user who goes out on the selected subchannel that goes out of upgrading; Income power ratio update module is upgraded the income power ratio, comprises the income power ratio of all users on the selected subchannel that goes out, and the selected income power ratio of user on all subchannels that goes out; And the allocative decision sending module, determine and send the allocative decision of final subchannel and power to trunk desk.

To achieve these goals, according to the present invention, also proposed a kind ofly based on integrated sub-channel and power distribution method in the sub-district relay system of OFDM, comprising: the channel gain on each subchannel that each user side will measure feeds back to the base station by each trunk desk; The income power ratio of each user side on each subchannel determined according to the channel gain on each next subchannel of each client feeds back in the base station; From all user sides of whole sub-district and subchannel, select user side and subchannel with optimum income power ratio; And before the distribution power of each current trunk desk is no more than system's gross power restriction, the base station is according to selected user side and subchannel with optimum income power ratio, upgrade step by step each trunk desk in through-put power on the selected subchannel and selected user side the modulation system on selected subchannel, and upgrade the income power ratio of each user side on each subchannel, to determine final subchannel and power allocation scheme.

Description of drawings

Below in conjunction with the detailed description of preferred embodiment of accompanying drawing to being adopted, above-mentioned purpose of the present invention, advantage and feature will become apparent by reference, wherein:

Fig. 1 shows according to the reciprocal process schematic diagram between user of the present invention, relaying and the base station;

Fig. 2 shows according to user side processing procedure schematic diagram of the present invention;

Fig. 3 shows according to relay of the present invention processing procedure schematic diagram;

Fig. 4 shows according to base station of the present invention end processing procedure schematic diagram;

Fig. 5 is the schematic diagram that the present invention and additive method contrast aspect throughput of system, and throughput as can be seen from the figure of the present invention will be significantly better than only considering that subchannel distributes or the resulting result of method of power division;

Fig. 6 is the schematic diagram that the present invention and other method contrast aspect fairness, and fairness as can be seen from the figure of the present invention will be significantly better than only considering that subchannel distributes or the resulting result of method of power division; And

Fig. 7 is the schematic diagram that is used to realize system topology of the present invention.

Embodiment

The preferred embodiments of the present invention are described below with reference to the accompanying drawings.

The present invention is made of following structure:

As illustrated in fig. 1 and 2, user (SS) end comprises:

201: the pilot reception module receives and sends pilot signal from trunk desk;

202: the channel gain computing module, the intensity that receives pilot signal according to the pilot reception module is calculated the channel gain on each subchannel;

203: feedback module feeds back to trunk desk to the channel gain that measures.

As shown in figs. 1 and 3, trunk desk (RS) end comprises:

301: the pilot tone sending module is used for sending pilot tone to user side;

302: the channel gain receiver module receives the channel gain that user side sends;

303: feedback module feeds back to cell base station to channel gain;

304: the allocative decision receiver module is used for receiving subchannel and the power allocation scheme that cell base station is sent;

305: allocative decision is implemented module, is used for the subchannel sent according to cell base station and the distribution of power allocation scheme determinant channel and power.

As shown in figs. 1 and 4, cell base station (BS) end comprises:

401: the channel gain receiver module receives the channel gain that sends from trunk desk;

402: initialization module is used for calculating the initial income power ratio of each user at each subchannel;

403: optimum income power ratio is selected module, is used for selecting user and the subchannel with optimum income power ratio from all users of whole sub-district and subchannel;

404: the constraint judging module is used for judging whether current allocation situation has violated the gross power restriction of system; If violate, then carry out 408 modules, otherwise carry out 405 modules.

405: power upgrading module, the through-put power of trunk desk on the subchannel that 403 modules are selected is used for upgrading;

406: modulation upgrading module, the modulation system of user on the subchannel that 403 modules are selected that 403 modules that are used for upgrading are selected;

407: income power ratio update module, be used for recomputating affected income power ratio, comprise the income power ratio of all users on the subchannel that 403 modules select and the income power ratio of user on all subchannels that 403 modules are selected;

408: the allocative decision sending module is used for sending to trunk desk the allocative decision of subchannel and power.

In the processing procedure of described initialization module 402, the increase of the throughput that its certain user U brings in subchannel C upgrading modulation system for user U in the income power ratio of certain channel C, divided by the power of other user required increase of whole system under the impregnable situation of the transmission of channel C.

In the processing procedure of described constraint judging module 404, will be according to the user U and the subchannel C that select in the judgment processing steps 403, judge upgrade in the subchannel C power increase of whole system that modulation system is brought of user U, the gross power of whether having violated current system limits.

Below by example implementation process of the present invention is described.

In the present example, have 6 trunk desks, each trunk desk has 5 users, and whole system has 6*5=30 user.The subchannel number of system is 16.Trunk desk and user distribution map in the plane as shown in Figure 7.From now on, the application uses n, m and k to represent trunk desk, user and subchannel respectively.Thus, the span of n is 1 ~ 6, and the span of m is 1 ~ 30, and the span of n is 1 ~ 16, wherein is numbered 1 ~ 5 user and belongs to trunk desk 1, and the user of numbering 6 ~ 10 belongs to trunk desk 2, and the like.

Each trunk desk sends pilot tone respectively successively in all channels, establish the transmitting power of pilot tone and make an appointment, and is P ^*Each user accepts pilot tone at all subchannels.If the signal strength signal intensity of the pilot tone that the trunk desk n that user m receives on subchannel k sends is P _Kmn, then user m calculates subchannel k and goes up the channel gain of trunk desk n to oneself:

$g_{\mathrm{kmn}}=\frac{P_{\mathrm{kmn}}}{P^{*}}---\left(1\right)$

In the present example, the channel gain of 6 trunk desk to 30 users on the subchannel 0 is: (m is capable, and the n row are trunk desk n to the channel gain of user m on subchannel 0)

1.987744e-008 9.218388e-012 4.160358e-012 1.909385e-012 2.501591e-012 7.037579e-012

5.995567e-010 1.074454e-011 4.529577e-012 6.967432e-012 3.033673e-012 4.090599e-011

2.120742e-011 3.843612e-011 2.753922e-012 3.066139e-012 1.877554e-012 2.458427e-012

1.234141e-010 3.170091e-012 2.062793e-012 1.378724e-012 1.542046e-012 1.957892e-012

3.570647e-011 1.027942e-011 1.049101e-012 1.048563e-012 1.086205e-012 3.378048e-012

3.816354e-011 3.943195e-011 3.298664e-012 2.022075e-012 1.506842e-012 4.934468e-012

5.922315e-012 2.606847e-011 3.837025e-011 2.829310e-012 1.012971e-012 1.496951e-012

3.122488e-012 1.941825e-010 1.318763e-011 3.498005e-012 1.307929e-012 1.031297e-012

1.285818e-011 6.035511e-010 7.128298e-012 6.742155e-013 3.858457e-012 1.363414e-012

1.277185e-011 5.176667e-011 1.786271e-011 1.604590e-012 1.105973e-012 7.861347e-013

2.140599e-012 6.442537e-012 7.702993e-011 1.340197e-011 1.053674e-012 9.827957e-013

1.697795e-012 1.097963e-011 7.160883e-011 1.127762e-011 3.171716e-012 5.876140e-013

1.287173e-012 1.056624e-011 4.216000e-010 3.849502e-011 4.613121e-012 1.399134e-012

1.229995e-012 2.023027e-012 3.700408e-011 1.375016e-011 2.494508e-012 1.858927e-012

2.131189e-012 1.480018e-011 5.930926e-011 1.729092e-012 1.225187e-012 3.424849e-012

1.724199e-012 1.034858e-012 3.609361e-012 1.048429e-010 4.270731e-012 1.562037e-012

2.562715e-012 9.254823e-012 1.213258e-011 9.911207e-011 3.107774e-012 1.197906e-012

2.404016e-012 5.488156e-013 4.361652e-012 7.721961e-011 1.761954e-011 4.662086e-012

8.849353e-013 5.934946e-012 6.101665e-011 3.010372e-011 1.533964e-011 2.483000e-012

1.160810e-012 1.431869e-012 4.657081e-012 2.363269e-010 4.671583e-012 1.909732e-012

8.324276e-012 3.228314e-012 1.836557e-012 4.176852e-012 1.506028e-010 5.184756e-011

1.787652e-012 1.934906e-012 3.563808e-012 1.945531e-011 6.313827e-011 1.807733e-012

4.486327e-012 1.752473e-012 2.528030e-012 2.428084e-012 7.828723e-011 2.736302e-011

1.385677e-012 1.410658e-012 2.024406e-012 4.830835e-012 9.283828e-011 1.212646e-011

1.095429e-012 7.520712e-013 5.240427e-012 7.879730e-012 2.600999e-010 5.786868e-012

1.582803e-012 1.441414e-012 1.737801e-012 1.523526e-012 2.991128e-011 8.307962e-011

3.431854e-011 7.402524e-012 1.041170e-012 3.494108e-012 2.557713e-012 4.865411e-011

5.547395e-011 8.360819e-012 2.823362e-012 4.321028e-012 7.582665e-012 3.640666e-011

2.952155e-011 1.343880e-012 1.000410e-012 3.735303e-012 1.488995e-012 8.220810e-011

2.303604e-010 8.390795e-012 1.148989e-012 5.308556e-012 3.997934e-012 4.290749e-011

Because length is limit, this paper no longer lists the channel gain on other 15 subchannels.Last 6 trunk desks of the subchannel O that user m calculates are all capable numerical value of m in the table to oneself channel gain, and user m feeds back to trunk desk to all channel gains that measure.After receiving the channel gain information of all user feedbacks, trunk desk can feed back to the base station to them.

Receive the channel gain information of all trunk desk feedbacks when the base station after, begin to carry out initialization module, promptly calculate the income power ratio of each user on each subchannel.The method of wherein calculating the income power ratio of user m* on subchannel k* is as follows:

If the last trunk desk n of the subchannel k that the base station obtains is g to the channel gain of user m _Kmn, near the noise power the user m is σ _m, the bit rate of user m current modulation system on subchannel k is b _Mk, the bit rate of user m next available modulation system on subchannel k is

Can calculate user m* thus in the resulting income of modulation system increase one-level of subchannel k* is

${\mathrm{Benefit}}_{m*k*}={\tilde{b}}_{m*k*}-b_{m*k*}---\left(2\right)$

Notice that OFDMA is last can to adopt multiple modulation system, comprises BPSK (biphase phase shift keying), QPSK (quaternary PSK), 16QAM (16 systems, four phase amplitude modulation(PAM)s), 64QAM (64 systems, four phase amplitude modulation(PAM)s).Wherein every kind of modulation system the number of bits difference that can on 1 hertz of bandwidth, transmit, be respectively BPSK-1, QPSK-2,16QAM-4,64QAM-6.Modulation system increases one-level and is the modulation system that the modulation system of comparatively rudimentary (being that the transmitted bit figure place is less) is become comparatively senior (being that the transmitted bit figure place is more), and to QPSK, QPSK is to 16QAM as BPSK, and 16QAM is to 64QAM.

User m* gets up to want complicated in the power calculation of the required consumption of modulation system increase one-level of subchannel k*, and concrete grammar is as follows:

In order to make user m* increase one-level in the modulation system of subchannel k*, other existing communication simultaneously is unaffected, and then user m* should increase at the signal interference ratio of subchannel k* thereupon, and other user should remain unchanged at the signal interference ratio of subchannel k*, promptly

$\left\{\begin{array}{cc}{\log }_2(1+\frac{p_{k*n_m}\·g_{k*n_{m}m}}{\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m})=b_{\mathrm{mk}*}& m\≠m*\\ {\log }_2(1+\frac{p_{k*n_m}{g}_{k*n_{m}m}}{\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}{g}_{k*n_{l}m}+{\mathrm{\σ}}_m})={\tilde{b}}_{\mathrm{mk}*}& m=m*\end{array}\right.---\left(3\right)$

Wherein, n _lAnd n _mTrunk desk under difference representative of consumer l and the m, p _K*nmFor subchannel k* goes up trunk desk n _mTransmitting power, p _K*nlFor subchannel k* goes up trunk desk n _lTransmitting power.

In the formula (3), n _l, n _m, g _K*nlm, g _K*nmm, σ _m, b _Mk*,

Be known quantity, p _K*nmBe unknown quantity, just the transmitting power on our each trunk desk of wanting to know.Want to know p _K*nmNeed solution formula (3).At first, get 2 being the logarithm at the end on our equal sign both sides in formula (3), and then all multiply by on both sides $\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m,$ Can obtain:

$\left\{\begin{array}{cc}\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m+p_{k*n_m}\·g_{k*n_{m}m}=2^{b_{\mathrm{mk}*}}\·(\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m)& m\≠m*\\ \underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m+p_{k*n_m}\·g_{k*n_{m}m}=2^{{\tilde{b}}_{\mathrm{mk}*}}\·(\underset{l\≠m}{\mathrm{\Σ}}{p}_{k*n_l}\·g_{k*n_{l}m}+{\mathrm{\σ}}_m)& m=m*\end{array}\right.---\left(4\right)$

Formula (4) both sides are put in order, can be obtained

$\left\{\begin{array}{cc}-(2^{b_{\mathrm{mk}*}}-1)\·\underset{l\≠m}{\mathrm{\Σ}}{g}_{k*n_{l}m}\·\stackrel{\stackrel{\‾}{\‾}}{p_{k*n_l}}+g_{k*n_{m}m}\·\stackrel{\stackrel{\‾}{\‾}}{p_{k*n_m}}=(2^{b_{\mathrm{mk}*}}-1)\·{\mathrm{\σ}}_m& m\≠m*\\ -(2^{{\tilde{b}}_{\mathrm{mk}*}}-1)\·\underset{l\≠m}{\mathrm{\Σ}}{g}_{k*n_{l}m}\·\stackrel{\stackrel{\‾}{\‾}}{p_{k*n_l}}+g_{k*n_{m}m}\·\stackrel{\stackrel{\‾}{\‾}}{p_{k*n_m}}=(2^{{\tilde{b}}_{\mathrm{mk}*}}-1)\·{\mathrm{\σ}}_m& m=m*\end{array}\right.---\left(5\right)$

For the purpose of eye-catching, all variablees in the formula (5) mark with two horizontal lines at the top.Formula (5) can be apparent in view find out it is a system of linear equations, use the most basic elimination can be at O (M ³) solve separating of each variable in the time, wherein M is user's a number, M=30 in this example.

Thus, we can obtain the transmitting power that subchannel k* goes up each trunk desk , before user m* increases transmitting power, the transmitting power p of trunk desk _K*nBe known quantity, both subtract each other and can obtain user m* and at the power that the modulation system of subchannel k* increases the required consumption of one-level be:

${\mathrm{Power}}_{m*k*}=\underset{n}{\mathrm{\Σ}}({\tilde{p}}_{k*n}-p_{k*n})---\left(6\right)$

According to formula (2) and formula (6), can obtain the income power ratio of user m* on subchannel k* and be

${\mathrm{BtoP}}_{m*k*}=\frac{\underset{n}{\mathrm{\Σ}}({\tilde{p}}_{k*n}-p_{k*n})}{({\tilde{b}}_{m*k*}-b_{m*k*})}---\left(7\right)$

In this example, user 1 to user 5 income power ratio is on 16 subchannels that calculate according to aforesaid way:

1.958515e+003 2.224461e+002 1.109382e+002 2.909514e+002 4.526218e+002

1.703806e+001 4.497352e+003 3.759909e+001 1.421997e+002 4.836982e+001

6.670493e+004 6.281242e+003 2.739510e+002 6.920837e+002 1.001577e+002

2.727393e+003 6.991082e+003 5.710074e+000 7.233129e+001 8.947743e+002

1.005774e+004 1.758594e+005 9.410412e+002 2.316846e+003 5.157874e+002

1.127974e+003 3.646957e+002 2.018668e+002 2.394377e+000 2.199961e+000

1.535534e+004 7.193437e+002 1.152694e+001 3.471594e+003 2.904841e+003

6.010842e+002 2.307023e+003 4.025513e+003 4.712806e+000 1.300391e+000

2.808832e+004 6.996002e+001 4.197728e+000 9.937292e+002 1.339739e+002

8.284222e+006 7.896824e+001 4.881175e+001 3.349650e+001 6.831637e+001

2.908908e+004 2.437733e+003 3.062335e+001 8.486343e+001 6.320420e+002

1.113739e+004 9.840820e+003 1.852430e+002 3.965679e+002 5.542791e+002

4.170961e+005 1.708934e+003 7.039336e+002 7.148324e+003 6.046355e+002

5.052887e+005 8.185485e+002 3.013981e+002 1.968714e+001 1.796652e+002

1.031776e+002 1.970491e+001 3.706407e+002 2.278441e+001 5.812186e+002

1.506009e+005 4.240052e+003 2.079354e+001 4.939372e+002 8.376883e+001

Because length relation, user 6 to 30 income power ratio is just no longer listed here on 16 subchannels.

According to the power ratio that bears interest that calculates, base station selectedly go out the maximum value power ratio, establish the maximum value power ratio from user m ^*With subchannel k ^*, the base station is then pre-judges that subchannel k* goes up the required power P ower of power upgrading of all trunk desks _M*k*, add the power P ower that present system has consumed _Current, whether surpassed total power constraint Power _ConstraintUnder situation about not exceeding, the base station is according to result calculated

Distribute power for again each trunk desk.After distributing power, the base station is user m ^*At subchannel k ^*Modulation system increase one-level.Then, user m is recomputated according to the method for aforementioned calculation income power ratio in the base station ^*In the income power ratio of all subchannels, and all users are at subchannel k ^*The income power ratio.And carry out the maximum value power ratio again and select.

In said process, calculate each user the income power ratio on each subchannel all need to find the solution system of linear equations formula (5) obtain for this user can need be in the performance number on each subchannel at upgrading modulation system each relaying on this subchannel, so in selected m* and k*, the performance number of relaying on each subchannel

Calculate.

After total power constraint was violated, the base station was current power division p _Kn, and modulation system b _Mk(modulation system has also just been represented the subchannel distribution) sends to all trunk desks.

When trunk desk is received power division p from the base station _KnWith modulation system b _MkAfter, implement this scheme, promptly according to power division p _KnWith modulation system b _MkAdjust own transmitting power and modulation system at each subchannel.

Fig. 5 and 6 is respectively method of the present invention and only considers the method (promptly fixing the transmitting power of each trunk desk) that subchannel distributes, only consider the method (i.e. given user's subchannel distribution at random in advance) of power division, neither consider subchannel distribute the method also do not consider power division (promptly fix the transmitting power of each trunk desk, and in advance at random given user's subchannel distribute) between trunk desk distance from 0 simulation result that changes to 4 times of standard trunk desk distance R.Here standard trunk desk distance R value is from trunk desk user distance r's farthest

Quilt, promptly $R=\sqrt{3}r$ 。When the trunk desk distance was 0, a plurality of trunk desks geographically coincided together, thereby interference each other is also maximum; When trunk desk distance be 4 times of standard trunk desks apart from the time, the user is minimum to the distance of other trunk desk to be to own trunk desk distance about 6 times, so the interference that other trunk desk causes is also very little.Changing different trunk desk distance makes the phase mutual interference between the trunk desk also change between very little from being up to.

Fig. 5 has provided at the throughput of system change curve that changes method of the present invention and other 3 kinds of methods under the trunk desk distance, and Fig. 6 has provided at the proportional fairness change curve that changes method of the present invention and other 3 kinds of methods under the trunk desk distance.As can be seen from the figure, no matter be throughput or fairness, method of the present invention all will be much better than other three kinds of methods.

Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by the foregoing description, and should be limited by claims and equivalent thereof.

Claims (5)

1. one kind based on integrated sub-channel and power distribution apparatus in the sub-district relay system of OFDM, comprising:

A plurality of user sides feed back to the base station with the channel gain on each subchannel that measures by each trunk desk;

Each trunk desk; And

The income power ratio of each user side on each subchannel according to the channel gain on each next subchannel of each client feeds back, determined in the base station; From all user sides of whole sub-district and subchannel, select user side and subchannel with optimum income power ratio; Before the distribution power of each current trunk desk is no more than system's gross power restriction, described base station is according to selected user side and subchannel with optimum income power ratio, upgrade step by step each trunk desk in through-put power on the selected subchannel and selected user side the modulation system on selected subchannel, and upgrade the income power ratio of each user side on each subchannel, to determine final subchannel and power allocation scheme.

2. equipment according to claim 1 is characterized in that described user side comprises:

The pilot reception module receives and sends pilot signal from trunk desk;

The channel gain computing module receives the channel gain on each subchannel of ionization meter of pilot signal according to the pilot reception module; And

Feedback module feeds back to trunk desk with the channel gain that measures.

3. equipment according to claim 2 is characterized in that described trunk desk comprises:

The pilot tone sending module sends pilot tone to user side;

The channel gain receiver module receives the channel gain that client feeds back is come;

Feedback module sends described channel gain to the base station of sub-district;

The allocative decision receiver module receives final subchannel and the power allocation scheme that send described base station; And

Allocative decision is implemented module, the distribution that final subchannel of sending according to described base station and power allocation scheme are determined subchannel and power.

4. equipment according to claim 3 is characterized in that described base station comprises:

The channel gain receiver module receives the channel gain that sends from trunk desk;

Initialization module calculates the initial income power ratio of each user at each subchannel;

Optimum income power ratio is selected module, is used for selecting user and the subchannel with optimum income power ratio from all users of whole sub-district and subchannel;

The constraint judging module judges whether current allocation situation has violated the gross power restriction of system; If violate, then enable the allocative decision sending module, otherwise, enable power upgrading module;

Power upgrading module, the through-put power of each trunk desk on the selected subchannel that goes out of upgrading;

Modulation upgrading module, the modulation system of the selected user who goes out on the selected subchannel that goes out of upgrading;

Income power ratio update module is upgraded the income power ratio, comprises the income power ratio of all users on the selected subchannel that goes out, and the selected income power ratio of user on all subchannels that goes out; And

The allocative decision of final subchannel and power is determined and sent to trunk desk to the allocative decision sending module.

5. one kind based on integrated sub-channel and power distribution method in the sub-district relay system of OFDM, comprising:

Channel gain on each subchannel that each user side will measure feeds back to the base station by each trunk desk;

The income power ratio of each user side on each subchannel determined according to the channel gain on each next subchannel of each client feeds back in the base station;

From all user sides of whole sub-district and subchannel, select user side and subchannel with optimum income power ratio; And

Before the distribution power of each current trunk desk is no more than system's gross power restriction, the base station is according to selected user side and subchannel with optimum income power ratio, upgrade step by step each trunk desk in through-put power on the selected subchannel and selected user side the modulation system on selected subchannel, and upgrade the income power ratio of each user side on each subchannel, to determine final subchannel and power allocation scheme.

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