CN101686073A - Pre-coding power normalization parameter transmitting and receiving method and equipment - Google Patents

Abstract

The invention discloses a pre-coding power normalization parameter transmitting and receiving method, comprising the following steps: a base station receives an ascending signal transmitted by a terminal, and channel information between multiple antennas of the base station and the terminal is obtained according to the ascending signal; the base station adopts a pre-coding algorithm to calculate apre-coding matrix corresponding to a descending time-frequency resource, and the transmitting powder normalization parameter of the time-frequency resource is calculated by utilizing the pre-coding matrix; the base station leads the transmitting powder normalization parameter to be bore in a descending signal and to be transmitted to the terminal. The invention further discloses a pre-coding power normalization parameter transmitting and receiving method and equipment; by adopting the technical proposal provided by the invention, the pre-coding power normalization parameter is transmitted toa receiving terminal, and the problem of MIMO pre-coding power normalization parameter transmission of multiple users is solved; in addition, the method is simple and has high efficiency, so as to bebeneficial to further promoting the system performance.

Description

The sending, receiving method of pre-coding power normalization parameter and equipment

Technical field

The present invention relates to moving communicating field, particularly, the present invention relates to mobile communication multi-antenna technology field.

Background technology

The multi-antenna technology of physical layer has become one of key technology of next generation wireless communication system, multi-antenna technology has lot of advantages, enlarge the throughput of system such as the spatial multiplexing gain that utilizes many antennas, utilize the diversity gain of many antennas to improve systematic function, utilize the directive gain of antenna to distinguish receiving terminal and eliminate interference between receiving terminal or the like.

In the downlink broadcast channel of the point-to-multipoint of modern cellular mobile communication, because the difference of each receiving terminal on the geographical position, can not work in coordination with reception, when there is the phase mutual interference in the received signal between each receiving terminal, can not adopt the method for Multiuser Detection to avoid interference.Therefore the effective ways that solve radio multi-user MIMO (Multiple-Input Multiple-Output, multiple-input, multiple-output) broadcast channel multi-user interference problem normally adopt precoding technique.The theory analysis proof adopts DPC method for precoding such as (Dirty Paper Coding) can reach the capacity of MIMO Gauss broadcast channel, therefore to the precoding technique research of radio multi-user MIMO broadcast channel, be to solve the key issue that the MIMO technology is applied to cellular system of new generation or WLAN (wireless local area network).

Yet owing to sending signal has been carried out precoding processing, base station side may have greatly changed to the transmitting power on each antenna, especially when channel relevancy is big.For the transmitting power scope is controlled, base station side needs power is carried out normalized after the transmitting terminal precoding, and receiving terminal need be known power normalization parameter, could correct demodulating data.Therefore, be that the MIMO technology is applied to the problem that cellular system of new generation or WLAN (wireless local area network) will face to effective transmission of pre-coding power normalization parameter and reception.

Summary of the invention

The object of the present invention is to provide a kind of sending, receiving method and equipment of pre-coding power normalization parameter,, solve the problem of transmission of multi-user MIMO pre-encoding power normalization parameter to realize that pre-coding power normalization parameter is transferred to receiving terminal.

In order to achieve the above object, embodiments of the invention disclose a kind of sending method of pre-coding power normalization parameter, may further comprise the steps:

The upward signal that the base station receiving terminal sends obtains channel information between many antennas in described base station and the described terminal according to described upward signal;

The pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence is adopted in described base station, utilizes described pre-coding matrix to calculate the transmitting power normalized parameter of described running time-frequency resource;

Described base station is carried on described transmitting power normalized parameter and sends to described terminal in the downstream signal.

According to embodiments of the invention, the channel information that obtains between many antennas in described base station and the described terminal according to described upward signal comprises:

Up channel information between many antennas in described base station and the described terminal is estimated according to the ascending pilot frequency that described terminal sends in described base station;

By interpolation algorithm, described base station obtains the channel information on all up running time-frequency resources;

According to the characteristic of channel of tdd systems, described base station obtains channel information on all descending running time-frequency resources according to the channel information on all up running time-frequency resources.

According to embodiments of the invention, the base station obtains after the channel information between many antennas in described base station and the described terminal according to described upward signal, described base station is selected N user and is carried out the multiuser MIMO transmission from the multi-user, wherein N is greater than 1, integer smaller or equal to the antenna for base station number may further comprise the steps:

The best user of described base station selected channel quality is as main user;

Described base station selects a user and described main user to form one group from remaining user, makes the channel capacity maximization;

Increase progressively the user successively, make that increasing the user and the described main user that come in forms one group, and make the channel capacity maximization, till number of users reaches N.

According to embodiments of the invention, described precoding algorithm comprises: zero forcing algorithm, least-mean-square error algorithm, block diagonalization (Block Diagonalization) algorithm, THP (Tomlinson-Harashima) algorithm, auxiliary (LR) algorithm of Ge Yuejian or Ge Yuejian auxiliary vector precoding (LRVP) algorithm.

According to embodiments of the invention, described downstream signal comprises down-bound pilot frequency signal.

According to embodiments of the invention, described downstream signal is an ofdm modulation signal, and described transmitting power normalized parameter is carried on the described pilot tone.

According to embodiments of the invention, described pilot resources is carried out precoding processing.

According to embodiments of the invention, described downstream signal comprises the business datum signal, and the modulation system of described business datum is the constant amplitude phase modulated.

According to embodiments of the invention, described downstream signal is an ofdm modulation signal, and described transmitting power normalized parameter is carried on the described business datum signal time-frequency domain.

According to embodiments of the invention, described business datum signal time-frequency domain resources is carried out precoding processing.

According to embodiments of the invention, when described precoding algorithm was the linear predictive coding algorithm, described base station was carried on the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal; When described precoding algorithm was the nonlinear precoding algorithm, described base station was carried on the average of the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal.

The present invention also provides a kind of method of reseptance of pre-coding power normalization parameter, may further comprise the steps: terminal receives the downstream signal that the base station sends, and described downstream signal carries transmitting power normalized parameter information; Described terminal is determined the mode of system bearing transmitting power normalized parameter, obtains described transmitting power normalized parameter by described downstream signal.

According to embodiments of the invention, described downstream signal comprises down-bound pilot frequency signal, and when described transmitting power normalized parameter is carried on the described down-bound pilot frequency signal, described terminal is carried out demodulation to the signal of pilot frequency locations, and restituted signal is power normalization parameter.

According to embodiments of the invention, described downstream signal comprises the business datum signal, and the modulation system of described business datum is the constant amplitude phase modulated, and described terminal is to the signal demodulation of professional time-frequency position, and the amplitude divided by modulation constellation behind the delivery is power normalization parameter.

The present invention also provides a kind of base station equipment, comprising:

Receiver module, described receiver module are used for the upward signal that receiving terminal sends; Precoding module, described precoding module are used for the upward signal according to described receiver module reception, determine the downlink signal transmitting power normalized parameter that described base station equipment sends; Sending module, described sending module are used for that described transmitting power normalized parameter is carried on downstream signal and send to described terminal.

According to embodiments of the invention, described precoding module comprises: channel estimation module, described channel estimation module are used for according to described upward signal, obtain estimating descending channel information between many antennas of described base station equipment and the described terminal; Computing module, described computing module adopt the pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence, utilize described pre-coding matrix to calculate the transmitting power normalized parameter of described running time-frequency resource; Mapping block, described mapping block is carried on described transmitting power normalized parameter on the described downstream signal running time-frequency resource, sends to described terminal by downstream signal.

According to embodiments of the invention, the described downstream signal of described mapping block carrying comprises down-bound pilot frequency signal.

According to embodiments of the invention, the described downstream signal of described mapping block carrying comprises the business datum signal.

Utilize technical scheme provided by the invention, realize pre-coding power normalization parameter is transferred to receiving terminal, solved the problem of transmission of multi-user MIMO pre-encoding power normalization parameter.According to embodiments of the invention, pre-coding power normalization parameter is carried on the different resource time-frequency domain in each antenna pilot position, between each antenna, there is not interference, system is easy to demodulation and obtains the transmitting power normalized parameter.Perhaps pre-coding power normalization parameter is carried on the identical resource time-frequency domain in each antenna pilot position, distinguishes, reduce the consumption of system resource by precoding.Perhaps the transmitting power normalized parameter is carried on the business datum, does not need the extra resource of system that takies, and under the situation that the user increases, the utilization of system resource can be not influenced yet.Utilize technical scheme provided by the invention, simple, efficient, help further elevator system performance.

Description of drawings

Fig. 1 is the embodiment schematic flow sheet of transmission pre-coding power normalization parameter of the present invention;

Fig. 2 is the mapping patterns of the embodiment of the invention four antenna descending pilot frequencies on time-frequency domain;

Fig. 3 is the mapping pattern of another embodiment of the present invention descending pilot frequency on time-frequency domain;

Fig. 4 sends the structural representation of pre-coding power normalization parameter base station equipment for the present invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:

The invention provides a kind of sending, receiving method and equipment of pre-coding power normalization parameter, to realize that pre-coding power normalization parameter is transferred to receiving terminal.Technical scheme of the present invention, the problem of transmission of solution multi-user MIMO pre-encoding power normalization parameter makes correctly detection signal of receiving terminal, uses technical scheme provided by the invention, and realization is simply, efficiently.

The invention provides a kind of sending method of pre-coding power normalization parameter, may further comprise the steps: the upward signal that the base station receiving terminal sends, according to the channel information between upward signal acquisition many antennas in base station and the terminal; The pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence is adopted in the base station, utilizes pre-coding matrix to calculate the transmitting power normalized parameter of running time-frequency resource; The base station is carried on the transmitting power normalized parameter and sends to terminal in the downstream signal.

As shown in Figure 1, be the embodiments of the invention flow chart, the present invention launched to elaborate below in conjunction with the flow chart of embodiment.

S101: the base station receives upward signal.In S101, the upward signal that the base station sends by receiving terminal, the relevant information of understanding down channel.

No matter be cellular mobile communication or WLAN (wireless local area network), be two-way communication, the up-downgoing channel can be Frequency Division Duplexing (FDD) or time division duplex communication.In the present embodiment, be example with the cellular mobile communication, adopt MIMO multi-antenna technology base station to send downstream signal, the upward signal of receiving terminal transmission simultaneously to terminal.The base station can obtain the relevant information of down channel in several ways, for example, in the information that terminal sends, wherein includes the metrical information of terminal to the base station down signal.

In addition, as embodiments of the invention,, can obtain the relevant information of down channel by following steps for the communication system TD-SCDMA of TDD time division duplex:

The ascending pilot frequency that the base station sends according to terminal is estimated up channel information between many antennas in base station and the terminal; By interpolation algorithm, the base station can obtain the channel information on all up running time-frequency resources; For tdd systems, in the enough short time, for example in 10ms or shorter time, the characteristic of channel according to tdd systems, can think that the characteristic of channel of up-downgoing remains unchanged, the base station can obtain the channel information on all descending running time-frequency resources according to the channel information on all up running time-frequency resources.

As embodiments of the invention, channel matched can be carried out to the multi-user according to multi-user's channel performance in the base station.The base station is according to after the channel information between upward signal acquisition many antennas in base station and the terminal, and the base station is selected N user and carried out the multiuser MIMO transmission from the multi-user, and wherein N is greater than 1, smaller or equal to the integer of antenna for base station number.

Be the process that the user is selected in the example explanation to simplify the Greedy criterion below.

At first, the best user of base station selected channel quality selects user k as main user by following formula ^*:

Upgrade selected user's number N _s=1, upgrade user's S set={ k ^*, calculate this user's the rate of delivering a letter:

$R\left(S\right)={\log }_2(1+\frac{{\left|\right|h_{k^{*}}\left|\right|}^2}{{\mathrm{\σ}}^2}).$

Then, the base station selects a user and main user to form one group from remaining user, makes the channel capacity maximization.For example select user m ^*, make capacity: S wherein ^p=S ∪ m}, matrix V is represented pre-coding matrix:

V=H ^H(HH ^H) ^-1, wherein Operator wherein | A| represents the size of set A

If R is (S ∪ { m ^*)＞R (S), so: S=S ∪ { m ^*, N _s=| S|, otherwise, S, N _sRemain unchanged.

Increase progressively the user successively, make that increasing the user and the main user that come in forms one group, and make the channel capacity maximization, till number of users reaches N.

S102: the transmitting power normalized parameter is determined in the base station.In S102, the pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence is adopted in the base station, and utilizes pre-coding matrix to determine the transmitting power normalized parameter of running time-frequency resource.

As embodiments of the invention, described precoding algorithm can be linear preequalization precoding algorithm, also can be non-linear preequalization precoding algorithm.In order to set forth inventive concept of the present invention better, describe the present invention below in conjunction with various precoding algorithms.

The Mathematical Modeling of considering the MIMO transmission channel is:

y＝Hx+n (1)

Wherein, x is the emission signal vector on the many antennas of transmitting terminal, and y is the received signal vector on the many antennas of receiving terminal, and H is the transmission channel matrix, and n is the white Gaussian noise vector.

For based on the linear preequalization algorithm of the ZF of the transmitting terminal precoding of ZF, the precoded signal of transmitting terminal is:

$x=\tilde{F}a---\left(2\right),$

Wherein,

H ⁺The pseudoinverse of expression H.

Reception data vector y at receiving terminal is:

$y=\frac{1}{\mathrm{\β}}(\mathrm{Hx}+n)=\frac{1}{\mathrm{\β}}(H\tilde{F}a+n)=a+\frac{1}{\mathrm{\β}}n---\left(3\right),$

Wherein, $\mathrm{\β}=\sqrt{K/\mathrm{trace}\left({\mathrm{HH}}^H\right)}---\left(4\right)$ For guaranteeing the constant power normalization parameter of transmit signal power.Wherein, K is for sending the signal number, and the inverse that multiply by power normalization parameter at receiving terminal compensates.

Send signal by being implemented in the linear predictive coding of making a start with the preequalization matrix multiple, the precoding vectors of formation is by behind the channel, and receiving terminal does not need just can directly be transmitted by demodulation through detecting.Preequalization algorithm based on ZF is better at channel condition, and the correlation of channel matrix H hour can effectively have been eliminated each interference between antennas.

For based on least mean-square error MMSE preequalization algorithm, making up the preequalization matrix

Shi Caiyong MMSE criterion promptly makes the error mean square value minimum of received signal at receiving terminal:

$\tilde{F}=\underset{\mathrm{\β},\mathrm{\ϵ}}{\arg \min }\mathrm{\ϵ}\left\{{\left|\right|{\mathrm{\β}}^{-1}(\mathrm{HF}\hat{a}+n)-a\left|\right|}^2\right\}---\left(5\right).$ Equally, the transmitting power of the vector that transmits after the transmitting terminal precoding is constant, and performance number is a constant:

$\mathrm{\ϵ}\left\{{\left|\right|\mathrm{Fa}\left|\right|}^2\right\}={\mathrm{K\σ}}_a^2---\left(6\right),$ K represents the number that transmits in the formula, σ _a ²The expression transmit signal power.

Obtaining optimized pre-coding matrix according to MMSE algorithm criterion is:

$\tilde{F}={\mathrm{\βH}}^H{({\mathrm{HH}}^H+\frac{{\mathrm{\σ}}_n^2}{{\mathrm{\σ}}_a^2}I)}^{-1}---\left(7\right),$ Wherein, power normalization parameter $\mathrm{\β}=\sqrt{K/\mathrm{trace}\left({\tilde{F}\tilde{F}}^H\right)}---\left(8\right),$ Then pre-coding matrix is $\tilde{F}={\mathrm{\βH}}^H{({\mathrm{HH}}^H+\frac{{\mathrm{\σ}}_n^2}{{\mathrm{\σ}}_a^2}I)}^{-1}.$

For two kinds of basic linear predictive coding algorithms set forth above, advantage is that algorithm is simple, and has eliminated the interference between antenna, is applicable to multi-user system.

For nonlinear precoding algorithm THP code calculation, at first channel matrix H is carried out QL and decompose, as follows:

H=F ^TS (9), wherein, matrix F is an orthogonal matrix, S is a lower triangular matrix.

In order to make the normalization that transmits, matrix B is had:

$B=\mathrm{diag}(\frac{1}{s_{11}},\·\·\·,\frac{1}{s_{\mathrm{KK}}})S---\left(10\right),$ Thereby make that the element on the diagonal of the matrix B after the normalization is 1.

By the thought of Interference Cancellation, the emission symbol of THP precoding is:

x ₁＝a ₁

x ₂＝mods _A(a ₂-b ₂₁x ₁)

...

$x_k={\mathrm{mod}s}_A(a_k-{\mathrm{\Σ}}_{j=1}^{k-1}{b}_{\mathrm{kj}}{x}_j)---\left(11\right),$ Wherein, K is the mimo system antenna number, a=[a ₁..., a _K] ^TBe source signal vector, x=[x ₁..., x _K] ^TBe the precoded signal vector.Conventional letter a _KBe the M-QAM modulation symbol, the real edge between modulation symbol be spaced apart [A/2, A/2), the definition

Modulo operation mods _A(x) purpose is in order to adjust transmitting power,

Wherein, in order to keep constant transmitting power, power normalization parameter β can be taken as:

$\mathrm{\β}=\sqrt{\frac{K}{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{1}{s_{\mathrm{kk}}^2}}}---\left(12\right).$

By transmitting through channel after the precoding, the received signal of receiving end is:

${\tilde{y}}_K={\mathrm{\Σ}}_{k=1}^K{b}_{\mathrm{Kk}}{x}_k+{\tilde{n}}_K$

$=x_K+{\mathrm{\Σ}}_{k=1}^{K-1}{b}_{\mathrm{Kk}}{x}_k+{\tilde{n}}_K---\left(13\right).$

After the modular arithmetic:

${\mathrm{mod}s}_A\left({\tilde{y}}_K\right)={\mathrm{mod}s}_A(a_K-{\mathrm{\Σ}}_{k=1}^{K-1}{b}_{\mathrm{Kk}}{x}_k+{\mathrm{\Σ}}_{k=1}^{K-1}{b}_{\mathrm{Kk}}{x}_k+{\tilde{n}}_K)$

$={\mathrm{mod}s}_A(a_K+{\tilde{n}}_K)---\left(14\right).$

After the THP precoding, signal no longer is the point on the planisphere, gets in the zone but be evenly distributed in.

For auxiliary (LR) algorithm of Ge Yuejian, suppose that the emission data for different user are a _i, be the lattice point on an integer lattice or the half-integer lattice, emission data vector a is the cartesian product in these seat spaces, component.So, whole reception constellation point also should be contained in Z ^2MThe space.At transmitting terminal, when the method that adopts channel to invert, transmit exactly to be parallel to H ⁺The hypercube of classifying the limit as in point.If data are Z ^2MInterior integral point, transmitting is exactly by H ⁺Point in the grid space that generates.If H ⁺The norm of a certain row very big, transmitting so accordingly just needs very big transmitting power, replaces these points by the point with less norm with other, can reduce transmitting power.The core concept of the auxiliary precoding algorithm of lattice yojan is: under the situation that does not change lattice structure, for the transmitting power that transmits and adopt suitable supporting zone to come minimized average.

Same, consider a N transmitting antenna, K single antenna user's mimo system adopts the pseudoinverse H of Ge Yuejian aided algorithm for its channel matrix ⁺Carry out accurate orthogonalization, suppose H _Red=H ⁺U is H ⁺Almost orthogonal matrix, U:K * K is a modular matrix, a is a primary signal, so

x＝H _reda′＝H ⁺Ua′

A '=mods _A(U ^-1A) (15), wherein, H _RedComputational methods can adopt the Lenstra-Lenstra-Lovasz reduction method.X is the actual transmit signal on the transmitting antenna, if adopt the M-QAM modulation, then

Adopt mods at receiving terminal _AComputing detects original transmitted signal, and received signal is:

y＝Hx+n＝HH ⁺Umods _A(U ^-1u)+n

＝Umods _A(U ^-1u)+n

=mods _A(UU ^-1U)+n=mods _A(u)+and n (16), because modular matrix do not change lattice structure, so the auxiliary precoding algorithm of Ge Yuejian can recover by modular arithmetic and transmits.Simultaneously, this algorithm is by the pseudoinverse H to channel matrix ⁺Accurate orthogonalization and modular arithmetic reduced the transmitting power that transmits widely, and reduced booster action to noise.

Wherein, power normalization parameter β is

$\mathrm{\β}=\sqrt{\frac{{\mathrm{K\σ}}_a^2}{\mathrm{trace}\left({\mathrm{XX}}^H\right)}}---\left(17\right).$

Can press the power normalization parameter β at formula (4), (8), (12), the corresponding running time-frequency resource of (17) calculating place respectively according to different precoding algorithms.

Obviously, above-mentioned introduction to various precodings only is used to explain the present invention, is not to be used to limit protection scope of the present invention.

S103: the base station is carried on the transmitting power normalized parameter and sends to terminal in the downstream signal.

In the MIMO communication system, owing to the information that will send has been carried out precoding processing at transmitting terminal, transmitting power has been carried out normalized, for BPSK, QPSK, the such phase modulation method of 8PSK, the convergent-divergent of amplitude can not influence the information that phase place is carried, receiving terminal need not to know just correct hard decision of power normalization parameter, promptly can be concerning no coded system not to receiving terminal transmitted power normalized parameter, but concerning coded system is arranged, can influence the value of soft bit, and then influence decode results.Therefore, the transmitting power normalized parameter must be sent to receiving terminal, receiving terminal is demodulating data better.

Cell mobile communication systems TD-LTE below in conjunction with TDD mode is described, the ground that is without loss of generality, and with base station 4 antennas, the configuring condition of the every user's single antenna of 4 users is an example.

As shown in Figure 2, be the mapping pattern of a kind of descending pilot frequency on time-frequency of TD-LTE existing standard.As embodiments of the invention, the transmitting power normalized parameter is carried on and sends to terminal in the down-bound pilot frequency signal, and in the present embodiment, downstream signal sends to terminal by the OFDM modulation.Can carry out following three steps in conjunction with concrete condition:

The first step: the β parameter at corresponding pilot tone place is mapped on the pilot tone of corresponding pilot frequency locations of each antenna by pilot frequency design respectively.For base station 4 antennas, the configuring condition of the every user's single antenna of 4 users, base station 4 antennas should adopt the pilot frequency design shown in Fig. 2, wherein R respectively ₀, R ₁, R ₂, R ₃The expression pilot frequency locations, the time-frequency domain resources of making fork is illustrated in this time-frequency domain and does not send data.Because the pilot frequency locations difference of each antenna, this pilot frequency design are not disturbed between each antenna.

Second step: multiply by the contrary of each independent channel respectively.The pilot signal and the modulated signal that are located at pilot frequency locations are respectively: a={a ₁, a ₂, a ₃, a ₃And x={x ₁, x ₂, x ₃, x ₄.Then have:

Wherein, h _IjThe channel of expression from antenna for base station i to j user antenna, subscript-1 expression is inverted, as h ₁₁ ^-1The channel of expression 1 pilot frequency locations contrary from antenna for base station 1 to the user.

The 3rd step: launch to being mapped to the many antennas in base station after business datum after the precoding processing and the pilot signal process IFFT processing.

In the above-described embodiments, because there is not interference in each pilot frequency locations difference between each antenna, carrying transmitting power normalized parameter need take certain system resource, and obviously, under the more situation of user, resource consumption also increases.

In addition, the transmitting power normalized parameter can be mapped on the pilot tone, and carry out sending to terminal again after the precoding processing shining upon the described pilot resources in back.For example, when the transmitting power normalized parameter is carried on as shown in Figure 3 the pilot tone pattern, can carry out following three steps in conjunction with concrete condition:

The first step: the β parameter at corresponding pilot tone place is mapped on the pilot tone of corresponding pilot frequency locations of each antenna by pilot frequency design shown in Figure 3 respectively, wherein R ₀The expression pilot frequency locations.Because the pilot frequency locations of each antenna is overlapping, exist between the multi-user and disturb, will eliminate interference by adopting method for precoding.

Second step: carry out precoding and disturb inhibition to handle.Signal is respectively after being located at the pilot signal of pilot frequency locations and precoding: a={a ₁a ₂a ₃a ₃} ^TAnd x={x ₁x ₂x ₃x ₄} ^TThen have:

Wherein, when for ZF algorithm criterion

Or work as for MMSE algorithm criterion

So analogize for other algorithms.H is the mimo channel matrix between base station and each user, matrix element h _IjThe channel of expression from antenna for base station i to j user antenna.

The 3rd step: launch to being mapped to the many antennas in base station after business datum after the precoding processing and the pilot signal process IFFT processing.

In the above-described embodiments, because there is not interference in each pilot frequency locations difference between each antenna, the system resource that carrying transmitting power normalized parameter need take is less, and under the situation that the user increases, the consumption of system resource can not increase.

In addition, the transmitting power normalized parameter can also be carried on the business datum signal, this moment, the modulation system of described business datum was the constant amplitude phase modulated.Preferably, can carry out sending to terminal again after the precoding processing to the described business datum signal time-frequency domain resources of carrying transmitting power normalized parameter.For example, when the transmitting power normalized parameter is carried on as shown in Figure 3 the pilot tone pattern, can carry out following three steps in conjunction with concrete condition:

The first step: pilot tone still adopts pilot frequency design mapping as shown in Figure 3, but pilot frequency locations transmission this moment no longer is the known pilot signal of receiving terminal user, but with the business datum signal of the such constant amplitude phase modulated of BPSK, QPSK, 8PSK, the β parameter of coming incidentally corresponding running time-frequency resource place by these business datum signals.Because the pilot frequency locations of each antenna is overlapping, exist between the multi-user and disturb, need to adopt method for precoding to eliminate and disturb.

Second step: carry out precoding and disturb to suppress handle, be located at the business datum signal of pilot frequency locations and precoding after signal be respectively: a={a ₁a ₂a ₃a ₃} ^TAnd x={x ₁x ₂x ₃x ₄} ^TThen have:

Wherein, when for ZF algorithm criterion

Or work as for MMSE algorithm criterion So analogize for other algorithms.H is the mimo channel matrix between base station and each user, matrix element h _IjThe channel of expression from antenna for base station i to j user antenna.

The 3rd step: launch to being mapped to the many antennas in base station after business datum after the precoding processing and the pilot signal process IFFT processing.

In the above-described embodiments, because the place resource transmission of carrying transmitting power normalized parameter is business datum, do not need the extra resource of system that takies, and under the situation that the user increases, the utilization of system resource can be not influenced yet.

In the above-described embodiments, the precoding algorithm of employing can be a linear algorithm, also can be nonlinear algorithm.Preferably, when described precoding algorithm was the linear predictive coding algorithm, described base station was carried on the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal; When described precoding algorithm was the nonlinear precoding algorithm, described base station was carried on the average of the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal.For example, in the above-described embodiments, all carry out the transmitting power normalized parameter in pilot frequency locations and carry, different is, what described pilot frequency locations can be carried is pilot tone, and what also can carry is business datum.Therefore, for the linear predictive coding algorithm, the transmitting power normalized parameter that carries is the β value of described pilot frequency locations, and for the nonlinear precoding algorithm, the transmitting power normalized parameter that carries is the average of the β value around the described pilot frequency locations.

The present invention also provides a kind of method of reseptance of pre-coding power normalization parameter, may further comprise the steps: terminal receives the downstream signal that the base station sends, and downstream signal carries transmitting power normalized parameter information; Terminal is determined the mode of system bearing transmitting power normalized parameter, obtains described transmitting power normalized parameter by downstream signal.Terminal can be obtained the mode of system bearing transmitting power normalized parameter by modes such as receiving system message, thereby obtains the transmitting power normalized parameter from downstream signal.

Obviously, the method for reseptance of pre-coding power normalization parameter is determined by sending method.As embodiments of the invention, downstream signal comprises down-bound pilot frequency signal, and when the transmitting power normalized parameter is carried on the down-bound pilot frequency signal, terminal is carried out demodulation to the signal of pilot frequency locations, and restituted signal is power normalization parameter.

As another embodiment of the present invention, downstream signal comprises the business datum signal, wherein the modulation system of business datum is the constant amplitude phase modulated, and terminal is to the signal demodulation of professional time-frequency position, and the amplitude divided by modulation constellation behind the delivery is power normalization parameter.

As shown in Figure 4, the present invention also provides a kind of base station equipment 400, comprising: receiver module 410, receiver module 410 are used for the upward signal that receiving terminal sends; Precoding module 420, precoding module 420 are used for the upward signal according to receiver module 410 receptions, determine the downlink signal transmitting power normalized parameter that base station equipment 400 sends; Sending module 430, sending module 430 are used for that described transmitting power normalized parameter is carried on downstream signal and send to terminal.

As the embodiment of the said equipment, precoding module 420 comprises:

Channel estimation module 421, channel estimation module 421 are used for according to described upward signal, obtain estimating descending channel information between base station equipment antenna more than 400 and the terminal;

Computing module 422, computing module 422 adopt the pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence, utilize pre-coding matrix to calculate the transmitting power normalized parameter of running time-frequency resource;

Mapping block 423, mapping block 423 is mapped in the transmitting power normalized parameter on the described downstream signal running time-frequency resource, sends to terminal by downstream signal.

Preferably, the downstream signal of mapping block 423 mappings comprises down-bound pilot frequency signal.

Preferably, the downstream signal of mapping block 423 mappings comprises the business datum signal.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (18)

1, a kind of sending method of pre-coding power normalization parameter is characterized in that, may further comprise the steps:

The upward signal that the base station receiving terminal sends obtains channel information between many antennas in described base station and the described terminal according to described upward signal;

The pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence is adopted according to described channel information in described base station, utilizes described pre-coding matrix to calculate the transmitting power normalized parameter of described running time-frequency resource;

Described base station is carried on described transmitting power normalized parameter and sends to described terminal in the downstream signal.

2, the sending method of pre-coding power normalization parameter as claimed in claim 1 is characterized in that, the channel information that obtains between many antennas in described base station and the described terminal according to described upward signal comprises:

Up channel information between many antennas in described base station and the described terminal is estimated according to the ascending pilot frequency that described terminal sends in described base station;

By interpolation algorithm, described base station obtains the channel information on all up running time-frequency resources;

According to the characteristic of channel of tdd systems, described base station obtains channel information on all descending running time-frequency resources according to the channel information on all up running time-frequency resources.

3, the sending method of pre-coding power normalization parameter as claimed in claim 1, it is characterized in that, the base station obtains after the channel information between many antennas in described base station and the described terminal according to described upward signal, described base station is selected N user and is carried out the multiuser MIMO transmission from the multi-user, wherein N is greater than 1, integer smaller or equal to the antenna for base station number may further comprise the steps:

The best user of described base station selected channel quality is as main user;

Described base station selects a user and described main user to form one group from remaining user, makes the channel capacity maximization;

Increase progressively the user successively, make that increasing the user and the described main user that come in forms one group, and make the channel capacity maximization, till number of users reaches N.

4, the sending method of pre-coding power normalization parameter as claimed in claim 1, it is characterized in that described precoding algorithm comprises: zero forcing algorithm, least-mean-square error algorithm, block diagonalization (Block Diagonalization) algorithm, THP (Tomlinson-Harashima) algorithm, auxiliary (LR) algorithm of Ge Yuejian or Ge Yuejian auxiliary vector precoding (LRVP) algorithm.

5, the sending method of pre-coding power normalization parameter as claimed in claim 1 is characterized in that, described downstream signal comprises down-bound pilot frequency signal.

6, the sending method of pre-coding power normalization parameter as claimed in claim 5 is characterized in that, described downstream signal is an ofdm modulation signal, and described transmitting power normalized parameter is carried on the described pilot tone.

7, the sending method of pre-coding power normalization parameter as claimed in claim 6 is characterized in that, described pilot resources is carried out precoding processing.

8, the sending method of pre-coding power normalization parameter as claimed in claim 1 is characterized in that, described downstream signal comprises the business datum signal, and the modulation system of described business datum is the constant amplitude phase modulated.

9, the sending method of pre-coding power normalization parameter as claimed in claim 8 is characterized in that, described downstream signal is an ofdm modulation signal, and described transmitting power normalized parameter is carried on the described business datum signal time-frequency domain.

10, the sending method of pre-coding power normalization parameter as claimed in claim 9 is characterized in that, described business datum signal time-frequency domain resources is carried out precoding processing.

11, as the sending method of each described pre-coding power normalization parameter in the claim 1 to 10, it is characterized in that,

When described precoding algorithm was the linear predictive coding algorithm, described base station was carried on the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal;

When described precoding algorithm was the nonlinear precoding algorithm, described base station was carried on the average of the described transmitting power normalized parameter of described running time-frequency resource correspondence and sends to described terminal in the downstream signal.

12, a kind of method of reseptance of pre-coding power normalization parameter is characterized in that, may further comprise the steps:

Terminal receives the downstream signal that the base station sends, and described downstream signal carries transmitting power normalized parameter information;

Described terminal is determined the mode of system bearing transmitting power normalized parameter, obtains described transmitting power normalized parameter by described downstream signal.

13, the method for reseptance of pre-coding power normalization parameter as claimed in claim 12, it is characterized in that, described downstream signal comprises down-bound pilot frequency signal, when described transmitting power normalized parameter is carried on the described down-bound pilot frequency signal, described terminal is carried out demodulation to the signal of pilot frequency locations, and restituted signal is power normalization parameter.

14, the method for reseptance of pre-coding power normalization parameter as claimed in claim 12, it is characterized in that, described downstream signal comprises the business datum signal, and the modulation system of described business datum is the constant amplitude phase modulated, described terminal is to the signal demodulation of business datum time-frequency position, and the amplitude divided by modulation constellation behind the delivery is power normalization parameter.

15, a kind of base station equipment is characterized in that, comprising:

Receiver module, described receiver module are used for the upward signal that receiving terminal sends;

Precoding module, described precoding module are used for the upward signal according to described receiver module reception, determine the downlink signal transmitting power normalized parameter that described base station equipment sends;

Sending module, described sending module are used for that described transmitting power normalized parameter is carried on downstream signal and send to described terminal.

16, base station equipment as claimed in claim 15 is characterized in that, described precoding module comprises:

Channel estimation module, described channel estimation module are used for according to described upward signal, obtain estimating descending channel information between many antennas of described base station equipment and the described terminal;

Computing module, described computing module adopt the pre-coding matrix of precoding algorithm computation down time-frequency resource correspondence, utilize described pre-coding matrix to calculate the transmitting power normalized parameter of described running time-frequency resource;

Mapping block, described mapping block is carried on described transmitting power normalized parameter on the described downstream signal running time-frequency resource, sends to described terminal by downstream signal.

17, base station equipment as claimed in claim 16 is characterized in that, the described downstream signal of described mapping block carrying comprises down-bound pilot frequency signal.

18, base station equipment as claimed in claim 16 is characterized in that, the described downstream signal of described mapping block carrying comprises the business datum signal.

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