CN101895324A - Target identification method for beam forming in multi-user wireless communication system - Google Patents
Target identification method for beam forming in multi-user wireless communication system Download PDFInfo
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- CN101895324A CN101895324A CN2010102242859A CN201010224285A CN101895324A CN 101895324 A CN101895324 A CN 101895324A CN 2010102242859 A CN2010102242859 A CN 2010102242859A CN 201010224285 A CN201010224285 A CN 201010224285A CN 101895324 A CN101895324 A CN 101895324A
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Abstract
The invention discloses a target identification method for beam forming in a multi-user wireless communication system, which comprises the following steps: 1, K numbered expectation users simultaneously send respectively allocated Walsh sequences as training sequences; 2, a receiver samples a receiving signal, and estimates a signal covariance matrix; 3, the covariance matrix is used for estimating DOA of K+J numbered signals; 4, weight vector of each DOA is figured out; 5, the received signals are weighted and summed to obtain K+J numbered output; and 6, the K+J numbered output respectively identifies whether a branch corresponds to one expectation user by a related judgment unit. The invention has the advantages that in the multi-user system in which the interference exists, the direction of the expectation user can be identified so as to complete the beam forming.
Description
Technical field
The present invention relates to the multi-user wireless communication field, be specifically related to the target identification method that wave beam forms in the multi-user wireless communication system.
Technical background
It is one of key technology in the wireless communication system that wave beam forms.It is advantageous that and to suppress to disturb, improve the received signal Signal to Interference plus Noise Ratio.In the implementation procedure that wave beam forms, by direction of arrival (DOA, Direction of Arrival) though estimates to judge direction of signal, but which can't be distinguished is desired signal, which is an interference signal, and then can't determine the weight vector of desired user, desired user is carried out wave beam form.
Summary of the invention
The technical problem that patent of the present invention will solve is a plurality of users and disturbs in the wireless communication system that exists, by target identification, distinguishes desired signal and interference signal.
The technical scheme that solves described problem is the target identification method that digital beam forms in a kind of multi-user wireless communication system, and implementation step is: the first step, K desired user respectively distributed a different Walsh sequence b
i(t), i=1 ..., K, sequence length are T, each user transmitter sends separately Walsh sequence simultaneously as training sequence; In second step, receiver x (t) to received signal carries out L sampling, obtains L snap x (1) ..., x (L), thereby composition data matrix X=[x (1) ... x (L)], according to formula
Estimate to obtain array covariance matrix R; The 3rd step, covariance matrix R is carried out DOA estimate, obtain K+J angle information, i.e. θ
i, i=1 ..., K, wherein K angle is desired user, J angle is for disturbing; In the 4th step, calculate all angles θ
iCorresponding weight vector w
i(t), i=1 ..., K+J; The 5th step, utilize weight vector, be weighted summation to received signal, obtain K+J output
I=1 ..., K+J; In the 6th step, each exports y
i(t) respectively by a relevant decision unit, finish signal recognition.
The beneficial effect of patent of the present invention is in the multi-user wireless communication system that the existence disturbed is arranged, and can pick out the direction of desired user signal and the direction of interference signal, forms the weight vector of desired user, desired user is carried out wave beam form.
Description of drawings
Fig. 1 is a target identification method receiving terminal system structure chart;
Fig. 2 is the relevant decision unit structure chart of a branch road.
Embodiment
In cell mobile communication systems, the even linear array of M array element is adopted in the base station, array element distance be carrier wavelength half.K in a sub-district desired user, the DOA that arrives the base station is θ
i, i=1 wherein ..., simultaneously, there be J interference user signal of adjacent cell in K, and DOA is θ
i, i=K+1 wherein ..., K+J.All signals all are the uncorrelated signals in far field, arrowband.Which the base station need distinguish is the desired user signal, and which is an interference signal, forms thereby only desired user is carried out wave beam.
The target identification method that wave beam forms in a kind of multi-user wireless communication system, at user's transmitting terminal each desired user is distributed a different Walsh sequence, each user sends separately Walsh sequence simultaneously as training sequence, and this Walsh sequence and distribution method are that receiver is known.The Walsh sequence can produce with the Hadamar conversion, by single order Hadamar matrix H
1=1 beginning, 2
NRank Hadamar matrix
By 2
N-1Rank Hadamar matrix is definite, promptly
At last, get
The different rows sequence as different Walsh sequences.For the N that determines arbitrarily, the number that can produce the Walsh sequence is 2
NIndividual, so in order to reduce training sequence length, N is chosen as and satisfies 2
NThe smallest positive integral of＞K+J.
The target identification method receiving terminal system structure that wave beam forms in a kind of multi-user wireless communication system as shown in Figure 1.The array received signal phasor is
Wherein, p
iBe the amplitude of i signal, and b
i(t), i=1 ..., K is the Walsh sequence of i desired signal, b
i(t), i=K+1 ..., K+J is the Walsh sequence of i interference signal, DOA is θ
iThe direction vector of signal correspondence be
N (t) is an array Gauss thermal noise vector.Array received signal x (t) is carried out L sampling, obtains L snap x (1) ..., x (L), thereby composition data matrix X=[x (1) ... x (t)], according to formula
Estimate to obtain array covariance matrix R.Adopt super-resolution MUSIC algorithm to carry out DOA and estimate, can estimate K+J angle information, i.e. θ
i, i=1 wherein ..., K+J.The MUSIC algorithm is a techniques well known, and concrete steps are:
The first step, with sequence hypothesis (SH) algorithm, perhaps red pond information theory criterion (AIC) method, perhaps minimum description length (MDL) method estimates expectation and interference signal number K+J.
Second step, covariance matrix R is carried out feature decomposition, get its K+J big characteristic value character pair vector e
1..., e
K+J, and matrix F=[e of this K+J characteristic vector formation
1... e
K+J].
The 3rd step, defined variable θ, the θ span is 0 °～180 °, the computer memory spectral function
This function must have K+J spectrum peak, i.e. local maximum, and this K+J θ that composes the peak correspondence is exactly θ
1..., θ
K+J
Then, calculate the weight vector of all angles correspondence
I=1 ..., K+J.Utilize this K+J weight vector, be weighted summation respectively with K+J branch road to received signal, obtain K+J output
I=1 ..., K+J.At this moment, y
i(t) be array antenna main lobe alignment thetax
iIncoming signal, zero falls into the wave beam of aiming at K+J-1 all the other incoming signals forms the result.Again each output y
i(t) by a relevant decision unit, finish signal recognition.
The concrete structure of relevant decision unit as shown in Figure 2, this is the detector of a parallel organization that is made of K related operation branch road, each branch road is finished y
i(t) and a local Walsh sequence b
j(t), j=1 ..., the related operation of K, the Walsh sequence that this K Walsh sequence distributed to desired user with transmitting terminal is identical.J related operation element output signal of the i branch road among Fig. 1 is
J=1 ..., K, wherein T is the Walsh sequence length.y
i(t) threshold setting of the corresponding relevant decision unit of signal is
If h
jGreater than threshold value, angle θ then
iFor adopting Walsh sequence b
j(t) desired user, wave beam forms weight vector should be w
i(t).If all K relevant outputs illustrate θ all less than thresholding
iCorresponding interference signal DOA.
The present invention uses different Walsh sequences as sign according to different user in the multi-user system that the existence disturbed is arranged, thereby can be from the DOA estimated result, the direction that picks out the certain desired user is come, georeferencing signal as wave beam forms calculates weight vector, finishes wave beam and forms.
Claims (2)
1. the target identification method that wave beam forms in the multi-user wireless communication system, implementation step is:
The first step is respectively distributed a different Walsh sequence b to K desired user
i(t), i=1 ..., K, sequence length are T, each user transmitter sends separately Walsh sequence simultaneously as training sequence;
In second step, receiver x (t) to received signal carries out L sampling, obtains L snap x (1) ..., x (L), thereby composition data matrix X=[x (1) ... x (L)], according to formula
Estimate to obtain array covariance matrix R;
The 3rd step, covariance matrix R is carried out DOA estimate, obtain K+J angle information, i.e. θ
i, i=1 ..., K+J, wherein K angle is desired user, J angle is for disturbing;
In the 4th step, calculate all angles θ
iCorresponding weight vector w
i(t), i=1 ..., K+J;
The 5th step, utilize weight vector, be weighted summation to received signal, obtain K+J output
I=1 ..., K+J;
In the 6th step, each exports y
i(t) respectively by a relevant decision unit, finish signal recognition.
2. according to the target identification method of wave beam formation in the described a kind of multi-user wireless communication system of claim 1, it is characterized in that: in relevant decision unit, the local generation with K identical Walsh sequence b of transmitting terminal
j(t), j=1 ..., K is input y
i(t) carry out related operation respectively with this K Walsh sequence
J=1 ..., if K is h
jGreater than threshold value, then should input y
i(t) be to adopt Walsh sequence b
j(t) desired user, otherwise should input y
i(t) be interference user.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564494A (en) * | 2004-04-01 | 2005-01-12 | 上海交通大学 | Self-adaptive beam shaping method of beam space orthogonal FDM medulating system |
| CN1595190A (en) * | 2004-07-06 | 2005-03-16 | 中兴通讯股份有限公司 | High resolution estimation method for incoming wave direction of mobile communication system |
-
2010
- 2010-07-13 CN CN2010102242859A patent/CN101895324A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564494A (en) * | 2004-04-01 | 2005-01-12 | 上海交通大学 | Self-adaptive beam shaping method of beam space orthogonal FDM medulating system |
| CN1595190A (en) * | 2004-07-06 | 2005-03-16 | 中兴通讯股份有限公司 | High resolution estimation method for incoming wave direction of mobile communication system |
Non-Patent Citations (1)
| Title |
|---|
| ALEXANDER KUCHAR: "A Real-Time DOA-Based Smart Antenna Processor", 《IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY》 * |
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Application publication date: 20101124 |