WO2013149440A1

WO2013149440A1 - Multi-antenna power allocation method and device

Info

Publication number: WO2013149440A1
Application number: PCT/CN2012/077964
Authority: WO
Inventors: 朱登魁; 宁迪浩; 肖华华; 李子荣; 鲁照华
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-04-06
Filing date: 2012-06-29
Publication date: 2013-10-10
Also published as: CN103369647A; CN103369647B

Abstract

Disclosed are a multi-antenna power allocation method and device. The method comprises: according to a precoding vector, setting a power scale factor of each data stream on each antenna; according to the power scale factor and a preset power value, setting the pre-allocated power of each data stream on each antenna; and according to the maximum transmitting power of each antenna, adjusting the abovementioned pre-allocated power, and using the adjusted pre-allocated power as the actual power of each data stream allocated on each antenna. The present invention solves the problem in the related art that optimal allocation cannot be performed on the power of each data stream when the antenna power is limited, thereby increasing the utilization rate of power, and increasing the system performance. In addition, the calculation method is simple, and is easy to achieve.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a power distribution method and apparatus for multiple antennas. BACKGROUND Multiple Input Multiple Output (MIMO) technology is a major breakthrough in smart antenna technology in the field of wireless mobile communications. The technology can multiply the capacity and spectrum utilization of the communication system without increasing the bandwidth, and can utilize multipath to mitigate multipath fading, and can effectively eliminate co-channel interference, improve channel reliability, and reduce errors. The code rate is a key technology that must be adopted in the new generation of mobile communication systems. Multi-antenna technology has evolved from traditional point-to-point communication (ie single-user multiple-input multiple-output: Single User MIMO, abbreviated as SU-MIMO) to point-to-multipoint communication (ie multi-user multiple input multiple output: Multiple User MIMO, abbreviated For MU-MIMO), in point-to-point or point-to-multipoint communication, there is a case where a control node simultaneously transmits multiple data streams to one terminal or multiple terminals. In this communication, the control node first forms data corresponding to each data stream by precoding operation for data transmitted on each antenna, so that data transmitted on each antenna is formed by the plurality of data streams. The superposition of the data, which requires the control node to distribute the limited power on each antenna between these data streams. In the traditional power allocation analysis, it is assumed that the total power of the control node is limited instead of each antenna power being separately limited, so its power allocation is often allocated according to the ratio of the square of the absolute value of each element in the precoding vector. . In fact, for cost reasons, the control node often has one power amplifier per antenna, that is, the transmit power of each antenna is individually limited, which brings a certain complexity to the power allocation, especially in the multi-stream. In this case, it is necessary to satisfy the ratio of the amplitude between the precoding vector coefficients, and also consider the power constraints on each antenna, and also consider the power allocation problem between the data streams. A general method for such problems. The optimization algorithm is used for global optimization, but this brings two troubles: First, the problem does not necessarily have an optimal solution. Second, even if there is an optimal solution, it needs to be solved by iteration, and the implementation is complicated, especially when When the number of antenna data streams is large. Therefore, in general, the power allocation between data streams is often simplified, for example, by distributing the total power evenly. However, this allocation method cannot achieve optimal allocation under the premise that the antenna power is limited. For the problem that the power of each data stream in the related art cannot be optimally allocated when the antenna power is limited, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION Embodiments of the present invention provide a multi-antenna power allocation method and apparatus, to at least solve the problem that the power of each data stream in the related art cannot be optimally allocated when the antenna power is limited. According to an aspect of an embodiment of the present invention, a multi-antenna power allocation method is provided, the method comprising: setting a power scale factor of each data stream on each antenna according to a precoding vector; according to the power scale factor and the pre- Setting a power value to set a pre-allocated power of each data stream on each antenna; adjusting the pre-allocated power according to a maximum transmit power of each antenna, and allocating the adjusted pre-allocated power as each data stream on each antenna Actual power. Setting a power scaling factor for each data stream on each antenna according to the precoding vector includes: setting a power scaling factor of the A data stream on the wth antenna to be = |M^| ² , where k = l - ', K, η = \,···,Ν; The precoding vector corresponding to the A data stream is W _T = [ ^ W _2k ... _Wnk : f, where K is the number of data streams, N is Refers to the number of antennas. _Wnk indicates that the first data stream corresponds to the precoding vector on the Nth antenna, indicating that the vector in [] is transposed. Setting the pre-allocated power of each data stream on each antenna according to the power scale factor and the preset power value includes: setting a pre-allocated power of the first data stream on the “antenna” to be 4^^, wherein, 4 tables

Shows the power pre-allocated to the A-th data stream on the current resource block, _nk = r _lk + r _2k ...... + r _Nt .

n=\ adjust the above pre-allocated power according to the maximum transmit power of each antenna, and use the adjusted pre-allocated power as the actual power allocated to each antenna on each antenna: Calculate each data stream to be allocated at the nth antenna = the sum of the _power; ^ in the set maximum value is selected, in accordance with ^^

Set the common power coefficient of each antenna to be; set the actual power allocated by the first data stream on the wth antenna to be A*=A^|^. Adjusting the pre-allocated power according to the maximum transmit power of each antenna, and using the adjusted pre-allocated power as the actual power allocated to each antenna on each antenna includes the following manner: calculating each data stream allocation in the

The resource block includes at least one of the following forms: one subcarrier in the Orthogonal Frequency Division Multiplexing (OFDM) system, one subcarrier in the orthogonal frequency division multiple access system, and the same symbol on the same orthogonal frequency division multiplexing technology. A sub-carrier, a time-domain multiple orthogonal frequency division multiplexing (OFDM) symbol is a resource block composed of a plurality of sub-carriers in the frequency domain. According to another aspect of an embodiment of the present invention, a multi-antenna power distribution apparatus is provided, the apparatus comprising: a power scale factor setting module configured to set a power ratio of each data stream on each antenna according to a precoding vector a factor; a pre-allocated power setting module, configured to set a pre-allocated power of each data stream on each antenna according to the power scale factor and the preset power value set by the power scale factor setting module; the actual power determining module is set to The pre-allocated power set by the pre-allocated power setting module is adjusted according to the maximum transmit power of each antenna, and the adjusted pre-allocated power is used as the actual power allocated to each antenna on each data stream. The power scale factor setting module includes: a power scale factor setting unit configured to set a power scale factor of the first data stream on the wth antenna to be r„ _t = ² , where k=\, K, n=l, -, N; The precoding vector corresponding to the first data stream is w _t = [ ^ w _2k ... _Wnk : f, where K is the number of data streams, N is the number of antennas, and _Wnk is the first data. The stream corresponds to the precoding vector on the Nth antenna, and represents a transposition operation on the vector in []. The pre-allocated power setting module includes: a pre-allocated power setting unit, configured to set the A-th data stream at the nth The pre-allocated power on the antennas is ^ ^= 4^^, where ^ indicates pre-allocation to the A-th data.

The power flowing on the current resource block, = r _lt + r ₂ , the actual power determining module includes: a first power and a computing unit, configured to calculate a sum of powers allocated to the nth antenna for each data stream = ^ Common power factor setting unit, set to the set

The first real setting unit is set to set the actual power allocated by the kth data stream on the second antenna to be

The actual power determining module includes a second power and a computing unit configured to calculate a sum of powers allocated to each antenna on the "antenna"

The power coefficient setting unit is configured to set a power coefficient corresponding to the „th antenna of each data stream; the second actual power setting unit is set to set the actual power allocated by the _Ath data stream on the “the antenna” to be _Pnk = . According to the present invention, the power scale factor of each data stream on each antenna is first set according to the precoding vector, and the pre-allocated power of each data stream on each antenna is set according to the power scale factor and the preset power value. Then, the pre-allocated power is adjusted according to the maximum transmit power of each antenna, and finally the adjusted pre-allocated power is used as the actual power allocated to each antenna on each antenna, and the power of each data stream in the related art is solved. When the antenna power is limited, the problem of optimal allocation cannot be performed, the power utilization rate is improved, the system performance is improved, and the calculation method is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flow chart of a power distribution method for multiple antennas according to an embodiment of the present invention; FIG. 2 is a block diagram showing a structure of a power distribution device for multiple antennas according to an embodiment of the present invention; FIG. 4 is a third structural block diagram of a multi-antenna power distribution device according to an embodiment of the present invention; FIG. 5 is a multi-antenna power according to an embodiment of the present invention; A fourth structural block diagram of a distribution device; Fig. 6 is a fifth structural block diagram of a multi-antenna power distribution device according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the related art, when power is applied to each data stream of an antenna on a control node, most of them adopt an average allocation method, which only considers the total power of the control node is limited, and does not take into account each antenna of the control node. The power is limited. Based on this, the embodiment of the present invention provides a multi-antenna power allocation method and device, and optimally allocates power of each data stream when each antenna power is limited. Description. The present embodiment provides a multi-antenna power allocation method, as shown in the flowchart of the multi-antenna power allocation method shown in FIG. 1 , which is described by taking the implementation on the control node as an example, and includes the following steps (step S 102- Step S106: Step S102, the control node sets a power scale factor of each data stream on each antenna according to the precoding vector; Step S104, the control node sets each data according to the power scale factor and the preset power value. Pre-assigned power flowing on each antenna; Step S106, the control node adjusts the pre-allocated power according to the maximum transmit power of each antenna, and allocates the adjusted pre-allocated power as each data stream is allocated on each antenna actual power. Through the above method, the power scaling factor of each data stream on each antenna is first set according to the precoding vector, and then the pre-allocated power of each data stream on each antenna is set according to the power scaling factor and the preset power value. Then, the pre-allocated power is adjusted according to the maximum transmit power of each antenna, and finally the adjusted pre-allocated power is used as the actual power allocated to each antenna on each antenna, and the power of each data stream in the related art is solved. When the antenna power is limited, the problem of optimal allocation cannot be performed, the power utilization rate is improved, the system performance is improved, and the calculation method is simple and easy to implement. For a control node configured with N (N is a natural number and greater than or equal to 2) antennas, simultaneously transmit (for natural numbers and greater than or equal to 1) data streams, and for the current resource block, the control node is at (" = 1, 1, . · · , The actual power allocated to the AC k = l, -, K) data streams on Λθ antennas is . The resource block may be a subcarrier in an Orthogonal Frequency Division Multiplexing (OFDM)/Orthogonal Frequency Division Multiple Access (OFDMA) system, or the same Multiple subcarriers on one OFDM symbol, or multiple OFDM in time domain A resource block composed of a plurality of subcarriers whose symbols are in the frequency domain may of course be one resource unit (frequency domain subcarrier or time domain symbol) in another wireless system. The acquisition process is described below. First, the control node sets the precoding vector for each data stream. The control node may calculate a precoding matrix of each data stream by using a channel coefficient corresponding to each data stream and a corresponding optimization criterion, where the matrix includes a precoding vector corresponding to each data stream. Therefore, this embodiment provides A preferred embodiment, that is, setting the precoding vector corresponding to the A data stream to W _t = [ ^ W _2k ... _Wnk : f, where _Wnk indicates that the first data stream corresponds to the precoding vector on the Nth antenna, [] ^T indicates that the vector in [] is transposed (of course, the vector is represented as a row or column and does not affect the calculation result). The above calculation method is relatively simple and has high accuracy, which provides a basis for subsequent calculation of the power scale factor of each data stream on each antenna. Second, the control node calculates a power scaling factor assigned to each antenna on the antenna based on the precoding vector of each data stream. The control node can set the power scale factor of the kth data stream on the nth antenna to be r _nk = , of course, the specific calculation formula is not limited thereto, and there may be a reasonable variation on the basis of the above formula, for example, ^ =Κ* | ^{2 χ} ΐ.οι and other variant formulas. The above calculation method is relatively simple and has high accuracy, which provides a basis for subsequent calculation of the pre-allocated power of each data stream on each antenna. Again, the control node allocates pre-allocated power to each antenna for each data stream based on the power scaling factor.

Ρ _Λ . The control node can set the pre-distributed power of the first data stream on the "ant antenna" to be _{nk =} A _k ^^, η=\ where, = r _lk + r _2k ...... + _3⁄4 , ie each data stream is in each The sum of power scale factors on the antenna. Represents the power pre-allocated to the first data stream on the current resource block. The resource block includes at least one of the following forms: One subcarrier in the orthogonal frequency division multiplexing system, positive One subcarrier in the frequency division multiple access system, multiple subcarriers on the same orthogonal frequency division multiplexing technology symbol, and multiple orthogonal frequency division multiplexing technology symbols in the time domain The above calculation method is relatively simple and has high accuracy, which provides a basis for subsequent calculation of the actual power allocated by each data stream on each antenna. Finally, the control node adjusts the pre-allocated power according to the maximum transmission power of each antenna, thereby obtaining The actual power allocated to each antenna on each antenna. There are two specific adjustment methods: The first way is to calculate the sum of the powers allocated to each antenna on each antenna.

In the set la, "', Q _N ) ÷ "^

Leg (3⁄4r 殳 bow ι "匪),

The common power coefficient of the leg antenna is that the actual power allocated by the kth data stream on the nth antenna is A* = A^§^, & is the pre-distributed power of each data stream at each antenna ± Multiplying the ± total power coefficient yields the actual power allocated for each data stream on each antenna.

The second way is to calculate the sum of the powers of each data stream allocated on the "antennas" = ^, and then set the power coefficient of each of the data streams corresponding to the "ant antennas, and finally set the kth data stream at the first" The actual power allocated on each antenna is _Pnk = p _nk , which is the pre-distributed work of each data stream on each antenna.

The rate is multiplied by the above power factor to obtain the actual power allocated for each data stream on each antenna. The above two methods are simple to implement and have high accuracy. The control node mentioned above is a device with control function in a wireless communication network, such as a relay station.

(Relay station), a wireless access point (AP) or a base station, etc., the base station may be a macro base station, a micro base station, a handheld base station (Femeto), a home base station (Home NodeB), or the like. Moreover, the calculation formula referred to above is merely an example, and the specific formula is not limited thereto, and a reasonable variation can be made on the basis of the above formula. The implementation process of the above embodiment will be described in detail below in conjunction with the preferred embodiments and the accompanying drawings. Embodiment 1 This embodiment assumes that the control node has 4 transmit antennas, that is, N=4, and the maximum transmit power of each antenna is ρ, that is, 3⁄4 = 3⁄4 = 3⁄4 = = 2, assuming simultaneous transmission on four antennas Two different data streams, ie, 2, are allocated on the current resource block by a pre-allocated method, and the resource block can be a sub-carrier on the OFDM symbol, and the power allocated to each data stream is equal, that is, two are set. Data stream pair The expected precoding vectors are =[ „ w _2l w _3l w _4l ] and Pw ₂ =[w ₁₂ w ₂₂ w ₃₂ w ₄₂ ], respectively, then the power ratio of each data stream on each antenna can be calculated first. Factor, corresponding to the first data stream

2

Precoding vector, you can set its power scale factor to:

,

2

For the precoding vector corresponding to the second data stream, the power scaling factor can be set as: r ₁₂ =| _Wl2 f,

|2 |2 |2

2

22 ― |^221, 32 — |^32 | , 42 — .

3

2

=

Secondly, suppose that the power allocated by the control node for the two data streams on the current resource block (that is, the preset power value) is 4=4=, and the pre-allocated power on the two antennas is:

2

2 The pre-allocated power of the second data stream corresponding to the four antennas is:

Finally, the pre-assigned powers corresponding to the two data streams on each antenna are added together to obtain:

Then the size of the comparison, which is assumed to be the maximum value, is finally calculated as the actual power allocated by the first data stream on the four antennas is:

Ρη /3⁄4= ₂₁ ", /1⁄2= ", (The control node used here is based on

The first adjustment of the maximum transmit power of each antenna to adjust the pre-allocated power), the actual power allocated by the second data stream on the four antennas are:

Ρ

Embodiment 2 This embodiment assumes that the control node has four transmit antennas, that is, N=4, and the maximum transmit power of each antenna is 2 _{1 =} = = = 2, assuming that two different data streams are simultaneously transmitted on four antennas, which is

K=2, and allocated on the current resource block by a pre-allocated method, the resource block may be a sub-carrier on the OFDM symbol, and the power allocated to each data stream is equal, that is, the pre-coding corresponding to the two data streams is set. The vectors are =[ „ w ₂₁ w _{31 41} ] ^r禾. w ₂ =[ ₁₂ w ₂₂ w ₃₂ w ₄₂ f , then the power distribution method shown below can be used: First, calculate each data stream in each antenna The power scale factor on the upper, for the precoding vector corresponding to the first data stream, the power scale factor can be set as: r _u

, you can set its power scale factor to: r ₁₂ =| _Wl2 f , |2 |2 |2

22 ― |^221 , 32 — |^32 | , 42 — |^421 . Secondly, assuming that the power allocated by the control node for the two data streams on the current resource block (ie, the preset power value) is 4 and ^, the pre-allocated power corresponding to the four antennas of the first data stream is:

The pre-allocated power of the second data stream corresponding to the four antennas is:

Then calculate the first data stream

The actual power allocated on the four antennas are:

The first adjustment of the maximum transmit power of each antenna to adjust the pre-allocated power); The actual power allocated by the second data stream over the four antennas is:

2

.

2

Embodiment 3

2

This embodiment assumes that the control node has four transmit antennas, that is, N=4, and the maximum transmit power of each antenna is ρ, that is, 3⁄4=3⁄4=3⁄4= assuming that two different data streams are simultaneously transmitted, that is, =2, Pass

3

Pre-allocated methods are assigned to current resources 2

On the block, the resource block can be a subcarrier on the OFDM symbol, and the power allocated to each data stream is equal, that is, the precoding vector points corresponding to the two data streams are set.

2

Don't be _Wi = [ _Wii w _2i w _{3i 41} f and Pw ₂ = [ ₁₂ w ₂₂ w ₃₂ w ₄₂ , then you can use the following

2

Power allocation method: First, calculate each data stream on each antenna 2 cases

The precoding vector can be set to have a power scale factor of: , . For the precoding vector corresponding to the second data stream, the power scale factor can be set to: , 22 ―

. Secondly, assuming that the power allocated by the control node for the two data streams on the current resource block (ie, the preset power value) is 4=4=, the pre-allocated power of the first data stream corresponding to the four antennas is:

42 Calculate the actual power allocated by the first data stream on the four antennas: Pu =Pu 'axe, /1⁄2= axe, /1⁄4= axe (the control node used here is based on

1⁄2

The second transmission mode of the maximum transmit power of each antenna adjusts the pre-allocated power); the actual power allocated by the second data stream on the four antennas is:

₌ . Q_ ₌ , Q_ ₌ , Q_ ₌ , Q_

Embodiment 4 This embodiment assumes that the control node has 4 transmit antennas, that is, N=4, and the maximum transmit power of each antenna is 3⁄4=3⁄4=3⁄4==2, assuming that two different data streams are simultaneously transmitted, that is, ^ =2, allocated by the pre-allocated method on the current resource block, the resource block may be a sub-carrier on the OFDM symbol, and the power allocated to each data stream is equal, that is, the pre-coding vectors corresponding to the two data streams are respectively set. For _Wl = [w _u w _2l w ₃ , ₄₁ ; Wo Pw ₂ = [w ₁₂ w ₂₂ w ₃₂ w ₄₂ , then the power allocation method shown below can be used: First, calculate each data stream on each antenna The power scaling factor, for the precoding vector corresponding to the first data stream, the power scaling factors can be set as:

For the precoding vector corresponding to the second data stream, the power scaling factors can be set to: 12 — 12

. Secondly, assuming that the power allocated by the control node for the two data streams on the current resource block (ie, the preset power value) is 4 and ^, the pre-allocated power corresponding to the four antennas of the first data stream is:

Then calculate the actual power allocated by the first data stream on the four antennas:

Ρη /3⁄4= ₂₁ ", /1⁄2= ", (The control node used here is based on

A second adjustment method for adjusting the pre-allocated power of the maximum transmit power of each antenna). The actual power allocated by the second data stream on the four antennas is:

Embodiment 5 This embodiment assumes that the control node has N (N is a natural number greater than or equal to 2) transmit antennas, and the maximum transmit power of each antenna is a natural data that assumes that f is a natural number greater than or equal to 1 and different data streams, And allocated on the current resource block by a pre-allocated method, the resource block may be a sub-carrier on the OFDM symbol, and the power allocated to each data stream is 4, . . . , 4^. Set the precoding vector corresponding to the above data streams to I^W^^uw _2l ■■■ w _m f , .... , w _K =[ww _2K ... _WMi ; , then the power distribution as shown below can be used Method - First, calculate the power scale factor of each data stream on each antenna. For the precoding vectors corresponding to the first (= 1, .··, ^:) data streams, the power scale factors can be set to : rn

..., ^r Nk = Second, set the pre-allocated power of the kth data stream corresponding to N antennas: Finally, the pre-allocated powers corresponding to the data streams on each antenna are added together to obtain:

Qi p _Nk ;

Then compare the size, assuming that "^ is the maximum value, then calculate the 4^ = 1, the actual power allocated by the water 3⁄4 data stream on the N antennas are:

_Pm = ρ _Μ (The control node used here is based on each water

Q ₂ β

The first adjustment of the maximum transmit power of the antenna to adjust the pre-allocated power). Embodiment 6 This embodiment assumes that the control node has N (N is a natural number greater than or equal to 2) transmit antennas, and the maximum transmit power of each antenna is a natural data that assumes that f is a natural number greater than or equal to 1 and passes through different data streams. The pre-allocated method is allocated on the current resource block, and the resource block may be a sub-carrier on the OFDM symbol, and the power allocated to each data stream is 4, . . . , 4^, and the corresponding f data streams are set. The precoding vectors are respectively Wi = [ „ w _2l ■■■ w _m , . . . , = [w _lK w _2K ■■■ w _NK , ij ij can use the power distribution method shown below: First, calculate each The power scale factor of each data stream on each antenna, for the number of Α ( = 1, . . . , ^:)

Secondly, set the first ^^ = 1,. ··, ^:) data streams corresponding to the pre-allocated powers on the N antennas:

Finally, the pre-allocated powers corresponding to the data streams on each antenna are added together to obtain:

Qi

Calculate the actual power of the distribution of the third ( = 1, . . . , ^:) data streams over the N antennas:

P = Pi _k , ......, p _Nk = p ~ _N (the control nodes used here are based on each

The second adjustment of the maximum transmit power of the antenna to adjust the pre-allocated power). Corresponding to the above-mentioned multi-antenna power allocation method, the present embodiment provides a multi-antenna power distribution device, which is used to implement the above embodiment, and can be implemented on a control node. 2 is a structural block diagram of a multi-antenna power distribution apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes: a power scale factor setting module 22, a pre-allocated power setting module 24, and an actual power determining module 26. The structure will be described below. The power scale factor setting module 22 is configured to set a power scale factor of each data stream on each antenna according to the precoding vector; the pre-allocation power setting module 24 is connected to the power scale factor setting module 22, and is set according to the power scale factor The power scaling factor and the preset power value set by the setting module 22 set the pre-allocated power of each data stream on each antenna; the actual power determining module 26 is connected to the pre-allocated power setting module 24, and is set according to each antenna The maximum transmit power adjusts the pre-allocated power set by the pre-allocated power setting module 24, and the adjusted pre-allocated power is used as the actual power allocated to each antenna on each antenna. Through the above apparatus, the power scale factor setting module 22 sets the power scale factor of each data stream on each antenna according to the precoding vector, and then the pre-allocation power setting module 24 sets each data according to the power scale factor and the preset power value. Pre-distributed power flowing on each antenna, and finally the actual power determining module 26 adjusts the pre-allocated power according to the maximum transmit power of each antenna, and the adjusted pre-allocated power is allocated as each data stream on each antenna. The actual power solves the problem that the power of each data stream in the related art cannot be optimally allocated when the antenna power is limited, improves the power utilization rate, improves the system performance, and the calculation method is simple and easy to implement. The present embodiment provides a preferred implementation manner, as shown in FIG. 3, for how to set the pre-assigned power of each data stream on each antenna according to the power scale factor and the preset power value set by the power scale factor setting module 22. The third structural block diagram of the multi-antenna power distribution device, the device includes the power scale factor setting unit 220, which is set to the

The power scale factor of the A data streams on the wth antenna is r„ _t = | | ² , where 4 = 1, .. ·, ^ , η = \, · · ' , Ν; the A data stream The corresponding precoding vector is w _t = [ ^ w _2k ... _Wnk : f, where K is the data stream _Number , N refers to the number of antennas, _Wnk indicates that the first data stream corresponds to the precoding vector on the Nth antenna, indicating that the vector in [] is transposed. The power ratio factor of each data stream on each antenna is set according to the precoding vector set by the precoding vector setting module 20. This embodiment provides a preferred embodiment, and the power of multiple antennas as shown in FIG. A fourth structural block diagram of the distribution device, the device includes, in addition to the various modules in FIG. 3, the pre-allocated power setting module 24 further includes: a pre-allocated power setting unit 240 configured to set the A-th data stream in the first The pre-allocated power on the antenna is ^^ : ^ ^^, where ^ indicates that the first data stream is pre-assigned to the current

The power on the resource block, | = Γ ₊ ...... +r . For adjusting the pre-allocated power set by the pre-allocated power setting module 24 according to the maximum transmit power of each antenna, this embodiment provides a preferred embodiment, and the fifth type of the multi-antenna power distribution device shown in FIG. Structural Block Diagram, the device includes, in addition to the various modules in FIG. 4, the actual power determining module 26 further includes: a first power and calculation unit 260, a common power coefficient setting unit 262, and a first actual power setting unit 264. The structure will be described below. a first power sum calculation unit 260 configured to calculate a sum of powers allocated to the nth antenna for each data stream = | _{; a} common power coefficient setting unit 262 coupled to the first power and calculation unit 260 for use in the set Select the maximum value "^, according to the common power factor of each line 3⁄4;

The leg and leg first actual power setting unit 264 is connected to the common power coefficient setting unit 262, and is set to set the actual power allocated by the kth data stream on the nth antenna to be p _nk = _nk ^. The present embodiment provides another preferred embodiment for adjusting the pre-allocated power set by the pre-allocated power setting module 24 according to the maximum transmit power of each antenna. The sixth embodiment of the multi-antenna power distribution device shown in FIG. In addition to the various modules in FIG. 7, the actual power determination module 26 further includes: a second power and calculation unit 266, a power coefficient setting unit 268, and a second actual power setting unit 269. The structure will be described below. The second power sum calculation unit 266 is configured to calculate a sum of powers allocated to the nth antenna for each data stream = | ^ power coefficient setting unit 268, connected to the second power and calculation unit 266, set to set each The power coefficient of the data stream corresponding to the nth antenna is

The α second actual power setting unit 269 is connected to the power coefficient setting unit 268, and is set to set the actual power allocated by the kth data stream on the nth antenna to be _ΡιΛ = . The control node involved in the foregoing is a device having a control function in a wireless communication network, such as a relay station, an access point (AP) or a base station, and the base station may be a macro base station or a micro base station. , Femeto, Home NodeB, etc. Moreover, the calculation formulas referred to above are merely illustrative, and the specific formula is not limited thereto, and can be rationally modified on the basis of the above formula. As can be seen from the above description, the present invention maximizes the power of the control node, performs optimal allocation under the condition that each antenna power is limited, and improves the utilization of the power application on the data stream with large demand. The rate increases the spectral efficiency and system performance of the system, and the calculation method is very simple and easy to implement. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A multi-antenna power distribution method, comprising:

Setting a power scaling factor of each data stream on each antenna according to a precoding vector; setting a pre-allocation power of each data stream on each antenna according to the power scaling factor and a preset power value;

The pre-allocated power is adjusted according to the maximum transmit power of each antenna, and the adjusted pre-allocated power is used as the actual power allocated to each antenna on each antenna.

2. The method according to claim 1, wherein setting a power scale factor of each data stream on each antenna according to a precoding vector comprises: setting a power scale factor of the kth data stream on the nth antenna to be r„ _t =| | ² , where k = l, -, K , η = \,···,Ν ; the precoding vector corresponding to the kth data stream is

... ^ΝκΓ, where Κ is the number of data streams, Ν is the number of antennas,

_WNK indicates that the first data stream corresponds to the precoding vector on the Nth antenna, and represents a transposition operation on the vector in [].

3. The method according to claim 2, wherein setting the pre-allocated power of each data stream on each antenna according to the power scale factor and the preset power value comprises: setting the A data stream at the nth The pre-allocated power on the antenna is _{nk =} A _k ^^, where ^ represents the power pre-assigned to the first data stream on the current resource block.

4. The method according to claim 3, wherein the pre-allocated power is adjusted according to a maximum transmit power of each antenna, and the adjusted pre-allocated power is included as an actual power allocated to each antenna on each antenna. The following method: Calculate the _sum of the powers allocated to the _nth antenna for each data stream =; ^^; Select the maximum value in the set..., according to the common power coefficient of each antenna set to

Set the actual power allocated by the A data stream on the "ant antenna" to be p _nk = .

5. The method according to claim 3, wherein the pre-allocated power is adjusted according to a maximum transmit power of each antenna, and the adjusted pre-allocated power is included as an actual power allocated to each antenna on each antenna. The following method: Calculate the sum of the powers of each data stream allocated on the "antennas"; ;^^; Set the power coefficient of the nth antenna corresponding to each data stream to be α

Set the actual power allocated by the kth data stream on the nth antenna to be p = _nk ^~.

The method according to claim 3, wherein the resource block comprises at least one of the following forms: one subcarrier in an Orthogonal Frequency Division Multiplexing (OFDM) technology system, and one subcarrier in an orthogonal frequency division multiple access system a plurality of subcarriers on the same orthogonal frequency division multiplexing (OFDM) symbol, and resource blocks formed by a plurality of subcarriers in the frequency domain.

7. A multi-antenna power distribution device comprising:

a power scale factor setting module, configured to set a power scale factor of each data stream on each of the antennas according to the precoding vector;

a pre-allocated power setting module, configured to set a pre-allocated power of each data stream on each antenna according to the power scale factor and a preset power value set by the power scale factor setting module; and the actual power determining module is set to The pre-allocated power set by the pre-allocated power setting module is adjusted according to a maximum transmit power of each antenna, and the adjusted pre-allocated power is used as an actual power allocated to each antenna on each antenna. The apparatus according to claim 7, wherein the power scale factor setting module comprises: a power scale factor setting unit configured to set a power scale factor of the Ath data stream on the nth antenna to be r„ _t =| M ² , where k = l -', K, η = \,···,Ν; the precoding vector corresponding to the A data stream is w _t =[ ^ w _2k ... _Wnk : f, where K is Refers to the number of data streams, N refers to the number of antennas, and w _w represents the precoding direction on the Nth antenna corresponding to the first data stream:

Vector expressed in [] _t is a transpose operation apparatus according to claim 8, wherein the pre-allocated power setting module comprises:

a pre-allocated power setting unit, configured to set a pre-allocated power of the A-th data stream on the n-th antenna to be _nk =A _kl ^, where ^ denotes that the A-th data stream is pre-assigned to the current resource block

Ν

The power, ∑ = + ...... +r _Nk .

The device according to claim 9, wherein the actual power determining module comprises:

a first power and calculation unit, configured to calculate a sum of powers allocated to each antenna on each of the data streams =| ^

k=\ The common power coefficient setting unit is set to select the maximum value ^ in the set, and the common power coefficient of each antenna is set to ^ according to ^; the first actual power setting unit is set to set the kth data stream at the nth The actual power allocated on the antennas is A*=

The device according to claim 10, wherein the actual power determining module comprises:

a second power and calculation unit, configured to calculate a sum of powers allocated to each antenna on each of the data streams =| ^

k=\ a power factor setting unit, configured to set a power coefficient corresponding to each antenna of each data stream to be

The second actual power setting unit is set to set the actual power allocated by the kth data stream on the nth antenna to be = ^.