CN101335970A - SDMA communication system resource distribution implementing method and apparatus - Google Patents

Abstract

The invention discloses a space division multiple access communication system resource allocation implement method, comprising: the step of obtaining space characteristic parameters, for obtaining space characteristic parameters of each user according to upstream signals or channel estimation of each user on an antenna array; the step of allocating the system resource, for determining space separation between the users according to the space characteristic parameters, and performing the system resource allocation according to the space separation. The application of the invention realizes the system resource multiplex of time, frequency and code channels and the like at the same time, thereby increasing system capacity and advancing wireless data transmitting ratio and the like.

Description

A kind of SDMA communication system resource allocation implementation method and device

Technical field

The present invention relates to SDMA communication system, particularly a kind of space division multiple access (SDMA) telecommunication system resources distributes implementation method and device.

Background technology

SDMA communication system is the spatial transmission characteristic according to the different user signal, for relative users is distributed and different space channels is provided, multiplexing with system resources such as realization time, frequency, code channels, thus reach purposes such as increasing power system capacity, raising wireless data transmission rate.

Space division multi-access usually is closely connected with the intelligent antenna technology existence.The spatial character and the Digital Signal Processing of the transmission of smart antenna using signal, spatial distribution according to signal, interference and noise, realize estimation of figuration weight vector and down beam shaping, promptly the useful signal direction in expectation forms main beam, the interference and the noise that suppress other direction are included in and form zero falling on certain interference radiating way.

Name is called " SDMA for WCDMA ", publication number is that the United States Patent (USP) of US2007/0019535A1 is divided a plurality of bunches (Cluster) according to user's space characteristics, every bunch of Walsh (Walsh) sequence of distributing a scrambler and a plurality of quadratures, the walsh sequence reusable between different bunches.This method utilizes space division multiple access technique to realize the multiplexing of code channel resource, but under the bigger situation of multipath angular spectrum expansion, can't judge the space isolation between the user exactly, may cause bunch a division difficulty even a mistake, thereby cause system interference obviously to increase.

Summary of the invention

Technical problem to be solved by this invention is, a kind of SDMA communication system resource allocation implementation method and device are provided, it can carry out system resource allocation according to the space characteristics of different user, reaches the increase power system capacity, improves the purpose of wireless data transmission rate.

A further object of the invention is used to provide a kind of SDMA communication system, and it can carry out system resource allocation according to the space characteristics of different user, reaches the increase power system capacity, improves the purpose of wireless data transmission rate.

For achieving the above object, SDMA communication system resource allocation implementation method provided by the invention is characterized in that, comprising:

The obtaining step of space characteristic parameter is used for according to each user uplink signal or channel estimating on the aerial array, obtains described each user's space characteristic parameter;

The system resource allocation step is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation.

Above-mentioned SDMA communication system resource allocation implementation method is characterized in that, described system resource allocation step further comprises:

Could realize the step that system resource is multiplexing between one judgement user, be used to judge whether the described space isolation between described user meets the demands, as meet the demands, can realize that system resource is multiplexing between then described user, otherwise, can't realize between described user that system resource is multiplexing.

Above-mentioned SDMA communication system resource allocation implementation method, it is characterized in that described space characteristic parameter comprises: the ripple of subscriber signal reaches the peak-to-average force ratio of angle and up received power angular spectrum.

Above-mentioned SDMA communication system resource allocation implementation method is characterized in that, described system resource allocation step also further comprises:

Ripple reaches the step of the angle thresholding at angle between the setting user;

Set the step of the acutance thresholding of user uplink received power angular spectrum.

Above-mentioned SDMA communication system resource allocation implementation method, it is characterized in that, the step whether space isolation between described user meets the demands further comprises: whether the difference that the ripple of judging the user reaches the angle surpasses the step of described angle thresholding, if then further judge that whether described user peak-to-average force ratio separately is all above described acutance thresholding; If not, the space isolation between then described user does not meet the demands.

Above-mentioned SDMA communication system resource allocation implementation method, it is characterized in that, judge that described whether all two users' peak-to-average force ratio separately in the step above described acutance thresholding, peak-to-average force ratio is all above described acutance thresholding as described, space isolation between then described user meets the demands, and the system resource between this user can be simultaneously multiplexing; Otherwise the space isolation between described user does not meet the demands.

Further, the resource allocation implement device of the above-mentioned SDMA communication system resource allocation of application provided by the invention implementation method is characterized in that this device comprises:

The space characteristic parameter computing module is used for according to each user uplink signal or channel estimating on the aerial array, calculates described each user's space characteristic parameter;

The system resource allocation module is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation; Described system resource allocation module further comprises a judge module, is used for whether judging between two users the feasible system resource multiplex by judging whether described space isolation between two users meets the demands.

Further, a kind of SDMA communication system provided by the invention comprises a system resource allocation implement device, it is characterized in that, described system resource allocation implement device comprises:

The space characteristic parameter computing module is used for according to each user uplink signal or channel estimating on the aerial array, calculates described each user's space characteristic parameter;

The system resource allocation module is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation; Described system resource allocation module further comprises a judge module, is used for whether judging between the user feasible system resource multiplex by judging whether described space isolation between the user meets the demands.

Compared with prior art, SDMA communication system resource allocation implementation method of the present invention and device, reach two space characteristic parameters of peak-to-average force ratio of angle and up received power angular spectrum based on the ripple of subscriber signal, judge the space isolation between the user, and realize system resource allocation in view of the above.When the space isolation between the user meets the demands, can realize simultaneously that then system resources such as time, frequency and code channel are multiplexing, thereby reach purposes such as increasing power system capacity, raising wireless data transmission rate.

Description of drawings

Fig. 1 is an embodiment of the invention SDMA communication system resource allocation implementation method flow chart;

Fig. 2 is an embodiment of the invention SDMA communication system resource allocation implement device schematic diagram.

Embodiment

Describing the present invention in detail below in conjunction with the drawings and specific embodiments, with purpose, scheme and the effect of further understanding the present invention, but is not as the restriction to claims protection range of the present invention.

Fig. 1 is the flow chart of embodiment of the invention SDMA communication system resource allocation implementation method; With reference to figure 1, space division multi-access resource allocation implementation method of the present invention comprises:

Step S10 according to each user uplink signal or the channel estimating on the aerial array, obtains described each user's space characteristic parameter, and described space characteristic parameter comprises: the ripple of subscriber signal reaches the peak-to-average force ratio of angle and up received power angular spectrum;

Step S20 judges space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation.

Above-mentioned steps S10 further comprises:

Step S101, obtain the subscriber signal ripple and reach the angle:

At aerial array, upward signal matrix or the channel estimate matrix of user k are

$H^{\left(k\right)}={\left[\begin{array}{cccc}{h}_0^{(k,0)}& h_1^{(k,0)}& ...& h_{W-1}^{(k,0)}\\ h_0^{(k,1)}& h_1^{(k,1)}& ...& h_{W-1}^{(k,1)}\\ ...& ...& ...& ...\\ h_0^{(k,M-1)}& h_1^{(k,M-1)}& ...& h_{W-1}^{(k,M-1)}\end{array}\right]}_{M\×W}...\left(1\right)$

In the formula, M represents the antenna channels number, and W represents that upward signal length or channel estimation window are long.

Space covariance matrix is expressed as

R ^(k)＝H ^(k)·(H ^(k)) ^H (2)

In the formula, () ^HThe computing of expression conjugate transpose.

In angular coverage, the angular spectrum representation of corresponding up received power is on user k, the θ direction

P ^(k)(θ)＝(w(θ)) ^H·R ^(k)·w(θ) (3)

In the formula, w (θ) is the vector relevant with array manifold and azimuth angle theta, adopts steering vector usually, i.e. w (θ _i)=a (θ _i).

The signal wave of user k reaches the angle estimated statement and is shown

${\mathrm{\θ}}^{\left(k\right)}=\underset{\mathrm{\θ}}{\arg }\left\{\max \left(P^{\left(k\right)}\left(\mathrm{\θ}\right)\right)\right\}---\left(4\right)$

Step S102, obtain the peak-to-average force ratio of user uplink received power angular spectrum:

Set the peak value window of user k received power angular spectrum: [θ ^(k)-α Ω, θ ^(k)+ α Ω], wherein, Ω is the half-power main lobe width of aerial array, parameter $\mathrm{\α}\≥\frac{1}{3}.$

In angular coverage, peak power can be expressed as the maximum of up received power, also can be expressed as the power average in the peak value window, that is:

$P_p^{\left(k\right)}=\max \left(P^{\left(k\right)}\left(\mathrm{\θ}\right)\right)=P^{\left(k\right)}\left({\mathrm{\θ}}^{\left(k\right)}\right)---\left(5\right)$

$P_p^{\left(k\right)}=\frac{1}{N_1}\·\underset{n=0}{\overset{N_1-1}{\mathrm{\Σ}}}{P}^{\left(k\right)}\left({\mathrm{\θ}}_n\right),{\mathrm{\θ}}_n\∈[{\mathrm{\θ}}^{\left(k\right)}-\mathrm{\α}\·\mathrm{\Ω},{\mathrm{\θ}}^{\left(k\right)}+\mathrm{\α}\·\mathrm{\Ω}]---\left(6\right)$

N in the formula ₁The hits of up received power in the expression peak value window.

In angular coverage, average power is expressed as peak value power average outside window, that is:

$P_m^{\left(k\right)}=\frac{1}{N_2}\·\underset{n=0}{\overset{N_2-1}{\mathrm{\Σ}}}{P}^{\left(k\right)}\left({\mathrm{\θ}}_n\right),{\mathrm{\θ}}_n\∉[{\mathrm{\θ}}^{\left(k\right)}-\mathrm{\α}\·\mathrm{\Ω},{\mathrm{\θ}}^{\left(k\right)}+\mathrm{\α}\·\mathrm{\Ω}]---\left(7\right)$

N in the formula ₂The expression peak value is the hits of up received power outside window.

So, the peak-to-average force ratio of the up received power angular spectrum of user k is expressed as:

${\mathrm{\η}}^{\left(k\right)}=\frac{P_p^{\left(k\right)}}{P_m^{\left(k\right)}}---\left(8\right)$

Method of the present invention comprises that also one sets the step that ripple between the user reaches the acutance thresholding of the angle thresholding at angle and user uplink received power angular spectrum; In the present embodiment, ripple reaches the angle thresholding Θ at angle and the acutance thresholding Γ of user uplink received power angular spectrum between the setting user.

Above-mentioned steps S20 further comprises:

Whether the difference that step S201, the ripple of judging two users reach the angle surpasses described angle thresholding, be, execution in step S202 then, otherwise the space isolation between described two users do not meet the demands, and can't realize between two users that system resource is multiplexing.

Step S202, judge that whether described two users peak-to-average force ratio separately is all above described acutance thresholding, peak-to-average force ratio is all above described acutance thresholding as described, and the space isolation between then described two users meets the demands, and the system resource between these two users can be simultaneously multiplexing; Otherwise the space isolation between described two users does not meet the demands, and can't realize between two users that system resource is multiplexing.

According to above-mentioned steps S201 and step S202, at user k and user l, if satisfy simultaneously

$\left\{\begin{array}{c}\mathrm{\Δ\θ}=|{\mathrm{\θ}}^{\left(k\right)}-{\mathrm{\θ}}^{\left(l\right)}|\≥\mathrm{\Θ}\\ \min ({\mathrm{\η}}^{\left(k\right)},{\mathrm{\η}}^{\left(l\right)})\≥\mathrm{\Γ}\end{array}\right.---\left(9\right)$

Then the space isolation between user k and the user l meets the demands, and can realize simultaneously that system resources such as time, frequency and code channel are multiplexing, and promptly the system resources such as time, frequency and code channel between user k and the user l can be in full accord; Otherwise, can't realize simultaneously between user k and the user l that system resource is multiplexing, promptly must be distinguished at aspects such as time, frequency or code channels.

The antenna distance of aerial array is relevant with array type.Generally speaking, the antenna distance of linear array for semi-load wave-wave long; And the antenna distance of circle battle array is about 0.4～0.6 times carrier wavelength.

Angle thresholding Θ is relevant with the half-power main lobe width of aerial array, common Θ 〉=β Ω, and wherein Ω is a main lobe width, parameter beta 〉=2.

The peak-to-average force ratio of user uplink received power angular spectrum can reflect the sharp-pointed degree (acutance) of received power angular spectrum effectively, effectively weighs parameter for one that can be used as the expansion of user's multipath angular spectrum equally to a certain extent.Common acutance thresholding Γ 〉=10dB.

Fig. 2 is an embodiment of the invention SDMA communication system resource allocation implement device schematic diagram.With reference to figure 2, SDMA communication system resource allocation implement device 10 provided by the invention, comprise: space characteristic parameter computing module 100, be used for according to each user uplink signal or channel estimating on the aerial array, calculate described each user's space characteristic parameter; System resource allocation module 200 is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation; Described system resource allocation module further comprises a judge module 201, is used for whether judging between two users the feasible system resource multiplex by judging whether described space isolation between two users meets the demands.

In sum, SDMA communication system resource allocation implementation method provided by the invention and device, reach two space characteristic parameters of peak-to-average force ratio of angle and up received power angular spectrum based on the ripple of subscriber signal, judge the space isolation between the user, and realize system resource allocation in view of the above.When the space isolation between the user meets the demands, can realize simultaneously that then system resources such as time, frequency and code channel are multiplexing, thereby reach purposes such as increase power system capacity, raising wireless data transmission rate.

In Fig. 1 and Fig. 2, disclosed a kind of SDMA communication system comprises SDMA communication system resource allocation implement device 10, can realize method shown in Figure 1 by this SDMA communication system resource allocation implement device 10.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (10)

1, a kind of SDMA communication system resource allocation implementation method is characterized in that, comprising:

The obtaining step of space characteristic parameter is used for according to each user uplink signal or channel estimating on the aerial array, obtains described each user's space characteristic parameter;

The system resource allocation step is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation.

2, SDMA communication system resource allocation implementation method according to claim 1 is characterized in that, described system resource allocation step further comprises:

Could realize the step that system resource is multiplexing between one judgement user, be used to judge whether the described space isolation between described user meets the demands, as meet the demands, can realize that system resource is multiplexing between then described user, otherwise, can't realize between described user that system resource is multiplexing.

3, SDMA communication system resource allocation implementation method according to claim 2, it is characterized in that described space characteristic parameter comprises: the ripple of subscriber signal reaches the peak-to-average force ratio of angle and up received power angular spectrum.

4, SDMA communication system resource allocation implementation method according to claim 2 is characterized in that, described system resource allocation step also further comprises:

Ripple reaches the step of the angle thresholding at angle between the setting user;

Set the step of the acutance thresholding of user uplink received power angular spectrum.

5, SDMA communication system resource allocation implementation method according to claim 2, it is characterized in that, the step whether space isolation between described user meets the demands further comprises: whether the difference that the ripple of judging the user reaches the angle surpasses the step of described angle thresholding, if then further judge that whether described user peak-to-average force ratio separately is all above described acutance thresholding; If not, the space isolation between then described user does not meet the demands.

6, SDMA communication system resource allocation implementation method according to claim 5, it is characterized in that, judge that described whether all two users' peak-to-average force ratio separately in the step above described acutance thresholding, peak-to-average force ratio is all above described acutance thresholding as described, space isolation between then described user meets the demands, and the system resource between this user can be simultaneously multiplexing; Otherwise the space isolation between described user does not meet the demands.

7, SDMA communication system resource allocation implementation method according to claim 3 is characterized in that, the ripple of described subscriber signal reaches the angle and estimates to represent with following formula:

${\mathrm{\θ}}^{\left(k\right)}=\underset{\mathrm{\θ}}{\arg }\left\{\max \left(P^{\left(k\right)}\left(\mathrm{\θ}\right)\right)\right\},$

Wherein, P ^(k)(θ) angular spectrum of expression user k corresponding up received power on the θ direction, it can be represented by following formula:

P ^(k)(θ)＝(w(θ)) ^H·R ^(k)·w(θ)，

Wherein, w (θ) is the vector relevant with array manifold and azimuth angle theta, R ^(k)The representation space covariance matrix, it can be represented by following formula:

R ^(k)＝H ^(k)·(H ^(k)) ^H，

Wherein, () ^HThe computing of expression conjugate transpose, H ^(k)Upward signal or the channel estimate matrix of expression user k, can represent by following formula:

$H^{\left(k\right)}={\left[\begin{array}{cccc}{h}_0^{(k,0)}& h_1^{(k,0)}& \·\·\·& h_{W-1}^{(k,0)}\\ h_0^{(k,1)}& h_1^{(k,1)}& \·\·\·& h_{W-1}^{(k,1)}\\ \·\·\·& \·\·\·& \·\·\·& \·\·\·\\ h_0^{(k,M-1)}& h_1^{(k,M-1)}& \·\·\·& h_{W-1}^{(k,M-1)}\end{array}\right]}_{M\×W},$

Wherein, M represents the antenna channels number, and W represents that upward signal length or channel estimation window are long.

8, SDMA communication system resource allocation implementation method according to claim 3 is characterized in that the peak-to-average force ratio of described up received power angular spectrum is represented with following formula:

${\mathrm{\η}}^{\left(k\right)}=\frac{P_p^{\left(k\right)}}{P_m^{\left(k\right)}},$

Wherein, P _p ^(k)The maximum of up received power or the power average in the peak value window in the expression angular coverage,

P _m ^(k)Peak value power average outside window in the expression angular coverage,

The maximum P of described up received power _p ^(k)Represent with following formula:

$P_p^{\left(k\right)}=\max \left(P^{\left(k\right)}\left(\mathrm{\θ}\right)\right)=P^{\left(k\right)}\left({\mathrm{\θ}}^{\left(k\right)}\right)$

Power average P in the described peak value window _p ^(k)Represent with following formula:

$P_p^{\left(k\right)}=\frac{1}{N_1}\·\underset{n=0}{\overset{N_1-1}{\mathrm{\Σ}}}{P}^{\left(k\right)}\left({\mathrm{\θ}}_n\right),$

Wherein, N ₁The hits of up received power in the expression peak value window,

θ _nBelong in the peak value window of user k received power angular spectrum,

Described peak value power average P outside window _m ^(k)Represent with following formula:

$P_m^{\left(k\right)}=\frac{1}{N_2}\·\underset{n=0}{\overset{N_2-1}{\mathrm{\Σ}}}{P}^{\left(k\right)}\left({\mathrm{\θ}}_n\right),$

Wherein, N ₂The expression peak value is the hits of up received power outside window,

θ _nThe peak value that belongs to user k received power angular spectrum outside window,

The peak value window of described user k received power angular spectrum is represented with following formula: [θ ^(k)-α Ω, θ ^(k)+ α Ω], wherein, Ω is the half-power main lobe width of aerial array, parameter $\mathrm{\α}\≥\frac{1}{3}.$

9, a kind of resource allocation implement device that utilizes each described SDMA communication system resource allocation implementation method in the claim 1～8 is characterized in that this device comprises:

The space characteristic parameter computing module is used for according to each user uplink signal or channel estimating on the aerial array, calculates described each user's space characteristic parameter;

The system resource allocation module is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation; Described system resource allocation module further comprises a judge module, is used for whether judging between two users the feasible system resource multiplex by judging whether described space isolation between two users meets the demands.

10, a kind of SDMA communication system comprises a system resource allocation implement device, it is characterized in that, described system resource allocation implement device comprises:

The space characteristic parameter computing module is used for according to each user uplink signal or channel estimating on the aerial array, calculates described each user's space characteristic parameter;

The system resource allocation module is used for judging space isolation between described user according to described space characteristic parameter, and carries out system resource allocation according to described space isolation; Described system resource allocation module further comprises a judge module, is used for whether judging between the user feasible system resource multiplex by judging whether described space isolation between the user meets the demands.

Images