CN101562504B - Self-adaptive data sending method based on dual-polarized array antenna and system thereof - Google Patents

Self-adaptive data sending method based on dual-polarized array antenna and system thereof Download PDF

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Publication number
CN101562504B
CN101562504B CN2008101044514A CN200810104451A CN101562504B CN 101562504 B CN101562504 B CN 101562504B CN 2008101044514 A CN2008101044514 A CN 2008101044514A CN 200810104451 A CN200810104451 A CN 200810104451A CN 101562504 B CN101562504 B CN 101562504B
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徐晓东
王启星
耿鹏
曾召华
马欣
黄宇红
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China Mobile Communications Group Co Ltd
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Abstract

The invention discloses a self-adaptive data sending method based on a dual-polarized array antenna and system thereof. The dual-polarized array antenna comprises a first antenna array element group and a second antenna array element group. The method comprises the following steps: the dual-polarized array antenna receives data to be sent, and judges whether the data to be sent is sent over a downlink dedicated channel or a downlink common channel; if the data to be sent is sent over the downlink dedicated channel, the first antenna array element group and the second antenna array element group send the data to be sent according to a set downlink time sequence; otherwise, the first antenna array element group sends the data to be sent according to a set downlink time sequence, and the second antenna array element group sends the data to be sent after set delay time of the downlink time sequence. In the method and the system, data are sent in different ways according to characteristics of the downlink common channel and the downlink dedicated channel so as to maximally improve performances of the downlink common channel and the downlink dedicated channel and minimize network coverage and capacity loss caused by miniaturization of smart antennae while obviously reducing the width of the smart antennae.

Description

Self-adaptive data sending method and system thereof based on double polarization array antenna
Technical field
The present invention relates to the communications field, relate in particular to a kind of self-adaptive data sending method and system thereof based on double polarization array antenna.
Background technology
In order better to suppress CDMA (Code Division Multiple Access; Code division multiple access inserts) the intrinsic same frequency interference of system; Existing TD-SCDMA (Time Division-Synchronous CDMA, the time-division, synchronous code division multiple access inserted) system outdoor macrocell generally adopts the intelligent antenna beam shaping technology.The smart antenna that this technology adopted is the even linear array structure, even linear array as a kind of simple, reliability is higher, be easy to sectorization realizes, and the ripe relatively smart antenna form of figuration technology has obtained general application in the TD-SCDMA network.
It is generally acknowledged that intelligent antenna beam shaping gain (be appreciated that and be enhancing or the inhibition to disturbing to signal power) is the monotonically increasing relation with the bay number.In order to obtain bigger figuration gain, adopt eight antenna linear arrays in the TD-SCDMA network usually.But, if eight array elements in this linear array according to the half-wavelength spacing arrangement of routine, width is too big, is unfavorable for engineering construction.If simply come reduced width through reducing element number of array (for example being reduced to four array elements), figuration gain has tangible reduction so; And if through the compression array element distance method come reduced width, the stability of figuration gain will obviously reduce so.Simultaneously, the antenna miniaturization method of above-mentioned two kinds of reduced width all is unfavorable for the evolution of follow-up MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) framework.
Therefore, have the important way of the smart antenna of dual-polarized array, receive increasing concern as a kind of balancing antenna size and figuration gain.
Summary of the invention
The embodiment of the invention provides a kind of self-adaptive data sending method and system thereof based on double polarization array antenna; When being implemented in remarkable compression smart antenna width; Promote the performance of common down channel and downlink dedicated channels to greatest extent, reduce the network coverage and capacitance loss that the smart antenna miniaturization is brought as much as possible.
In the self-adaptive data sending method based on double polarization array antenna that the embodiment of the invention provides, said double polarization array antenna comprises the first antenna array tuple and the second antenna array tuple, and this method may further comprise the steps:
Said double polarization array antenna receives data to be sent;
Judge that data to be sent are to send or send through common down channel through downlink dedicated channels;
If send through downlink dedicated channels; Channel carries out channel estimating during then to the last line space of said data receiving terminal to be sent; Generate shape-endowing weight value; Utilize said shape-endowing weight value that said data to be sent are carried out weighted, the said first antenna array tuple and the second antenna array tuple are through this channel, according to the data to be sent after the descending sequential transmission weighted of setting;
If send through common down channel; Then utilize preset shape-endowing weight value that said data to be sent are carried out weighted; The said first antenna array tuple is through this channel; According to the data to be sent after the descending sequential transmission weighted of setting, the said second antenna array tuple is passed through this channel, the data to be sent after sending weighted behind the descending sequential time delay setting-up time of this setting.
The double polarization array antenna system that the embodiment of the invention provides; Comprise: baseband processing unit, RF processing unit, dual-polarized antenna array; Said dual-polarized antenna array comprises the first antenna array tuple and the second antenna array tuple; The said second antenna array tuple is connected with and is used for the signal lag unit that carries out delay process to transmitting, wherein
Baseband processing unit is used for data to be sent are carried out Base-Band Processing, and judges that data to be sent are to send or send through common signal channel through dedicated channel; If send through dedicated channel; Channel carries out channel estimating during then to the last line space of said data receiving terminal to be sent, generates shape-endowing weight value, utilizes said shape-endowing weight value that said data to be sent are carried out weighted; And the delay time of said signal lag unit is set to zero; If send, then utilize preset shape-endowing weight value that said data to be sent are carried out weighted, and the delay time of said signal lag unit is set to the value greater than zero through common signal channel;
RF processing unit, being used for the data transaction after the Base-Band Processing is radiofrequency signal;
The first antenna array tuple and the second antenna array tuple are used for received RF signal and launch, and wherein, the second bay group of received is through the radiofrequency signal of said signal lag unit delay process.
Adopt the above embodiment of the present invention, can adopt different modes to realize wave beam forming respectively to the characteristic of common down channel and downlink dedicated channels.When sending data for certain terminal through dedicated channel, adopt the mode of associating figuration, receive quality of signals and performance to improve target terminal; When sending signal through common signal channel, utilize multiple transmit antennas and the time-domain signal of each antenna emission is carried out corresponding delay process, thereby obtain multi-path combined gain, improve signal receiving performance.The above embodiment of the present invention adopts corresponding beam shaping mode voluntarily through the characteristic to common down channel and downlink dedicated channels; When significantly compression has the smart antenna width of dual-polarized array; Promote the performance of common down channel and downlink dedicated channels to greatest extent, reduce the network coverage and capacitance loss that the smart antenna miniaturization is brought as much as possible.
Description of drawings
Fig. 1 is the structural representation of the double polarization array antenna system of the embodiment of the invention;
Fig. 2 is based on the self-adapting data transmission flow figure of double polarization array antenna in the embodiment of the invention;
Fig. 3 is the schematic diagram of downlink dedicated channels united beam form-endowing in the embodiment of the invention;
Fig. 4 is to be the schematic diagram of common down channel wave beam forming and time-delay emission in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Referring to Fig. 1; Be the given double polarization array antenna system of the embodiment of the invention; This system comprises baseband processing unit 1, RF processing unit 2 and the aerial array 3 that connects successively, wherein, has M bar passage (M is the array element sum of aerial array) between RF processing unit 2 and the aerial array 3.Also comprise signal lag device (or claiming the signal lag unit) 4 in this system.Signal lag device 4 can be before the baseband processing unit 1, between baseband processing unit 1 and the RF processing unit 2, or RF processing unit 2 rear ends.Because the signal that is sent through antenna array tuple 31 and 32 in the present embodiment all will pass through identical Base-Band Processing and radio frequency processing; In order to reduce the transformation of original antenna system and to realize more easily; The embodiment of the invention preferably places RF processing unit 2 rear ends with signal lag device 4, and is as shown in Figure 1.
Signal lag device 4 can be realized by software, as the mode of timer is set through The software adopted, the signal of moment t sent at moment t+ δ constantly.
The major function of the baseband processing unit 1 in this system is identical with baseband processing unit in the existing antenna system; Comprise that the signal to outputing to aerial array carries out weighted; To processing such as the signal that receives from aerial array merge, also can realize channel estimating.
The major function of the RF processing unit 2 in this system is identical with RF processing unit in the existing antenna system; Mainly be to realize the radiofrequency signal conversion; As the signal that receives from aerial array is amplified, frequency conversion, mixing etc., to carrying out power amplification, antenna match etc. from the signal of aerial array emission.RF processing unit 2 also the individual radio frequency unit of M (M is the array element sum of aerial array) combine the corresponding data of handling a passage of each radio frequency unit wherein.
Aerial array 3 in this system can be any N+N dual-polarized array, and present embodiment is an example with the antenna of 4+4 dual-polarized array.Aerial array 3 among the figure comprises two array element groups (31,32); Two array element groups adopt different polarization modes; In Fig. 1; Array element group 31 adopts mutually orthogonal polarization mode (the positive 45 degree polarization of array element group 31 usefulness, array element group 32 usefulness negative 45 are spent and polarized) with array element group 32, and the spacing of the bay in every group is less than or equal to λ/2.Adopt the spatial fading characteristic of the aerial array 3 of said structure mutually orthogonal two groups of bays capable of using separate or correlation is less, satisfying the correlation demand that MIMO uses, and the more requirement of high-throughput.
Aerial array 3 also is provided with proofreaies and correct mouth, and this proofreaies and correct mouth can receive correction signal by any one passage from eight passages of aerial array 3, carries out the up-downgoing channel correcting.The same with the up-downgoing channel correcting of traditional array antenna, the correction interface that system shown in Figure 1 makes full use of 4+4 double polarization array antenna self and the inside correcting network that is connected each array element carry out up-downgoing together with eight passages of two polarised directions and proofread and correct.
The correction of up-downgoing passage is periodically to carry out; At each calibration cycle; The trimming process of data feedback channel is: certain passage of RF processing unit 2 is launched the correction mouth of predefined correction signal to aerial array 3; The signal that returns through eight radio-frequency channels while receiving antenna arrays 3 then; And receive signal through the base-band digital that radio frequency IF process such as down-conversion, sampling, analog-to-digital conversion are converted into eight passages and be sent to baseband processing unit 1, baseband processing unit 1 generates the up amplitude-phase compensation weights of each passage through matching mode;
The descending trimming process of passing through is: the correction mouth of predefined correction signal to aerial array 3 is launched in eight passage timesharing of RF processing unit 2; The signal that returns through a stationary conduit timesharing receiving antenna array 3 then; And receive signal through the base-band digital that radio frequency IF process such as down-conversion, sampling, analog-to-digital conversion are converted into eight passages and be sent to baseband processing unit 1, baseband processing unit 1 generates the descending amplitude-phase compensation weights of each passage through matching mode.
Above-mentioned double polarization array antenna system can realize that adaptive wave beam shaping and data send, and is as shown in Figure 2, realizes that based on above-mentioned double polarization array antenna system the process that self-adapting data sends may further comprise the steps:
Step 201, baseband processing unit 1 receive from the next data to be sent of sender unit transmission; Before passing through aerial array 3 transmitting downstream data; Judgement is to pass through dedicated channel transmitting downlink data (as being the dedicated channel data of a certain terminal transmission), still will pass through common signal channel transmitting downlink data (as being the common channel data of a plurality of terminal transmission).If the transmission dedicated channel data, then execution in step 202～204, are the downlink dedicated channels united beam form-endowing; If the transmission common channel data, then execution in step 205～207, are the common down channel wave beam forming line delay transmit diversity of going forward side by side.
Channel carries out channel estimating during the last line space of step 202,1 pair of downlink data receiving terminal of baseband processing unit, thereby obtains eight channel combined shape-endowing weight values.
In this step, channel impulse response matrix when baseband processing unit 1 obtains sky through channel estimating
H = h 1 ( 1 ) h 2 ( 1 ) h 3 ( 1 ) h 4 ( 1 ) h 1 ( 2 ) h 2 ( 2 ) h 3 ( 2 ) h 4 ( 2 )
Wherein, The up-converter channel impact responding of the n root array element that m polarised direction of vector
Figure GDA0000083139410000052
expression divided into groups,
Figure GDA0000083139410000053
grow most for channel estimation window long;
Then, according to matrix H signal calculated spatial correlation matrix R H:
R H＝H H·H
To R HCarry out characteristic value decomposition, obtain
R H = λ 1 u 1 u 1 H + Σ i = 2 8 λ i u i u i H
λ wherein 1Be eigenvalue of maximum, u 1Be eigenvalue of maximum characteristic of correspondence vector; With u 1Carry out the complex vector located conjugation of getting, obtain eight channel combined shape-endowing weight value w:
w = u 1 *
Step 203, baseband processing unit 1 use the weights that generate to carrying out weighted from the dedicated channel data unification that two array element groups of aerial array 3 are launched.
Base band data after step 204, the weighted converts radiofrequency signal into through RF processing unit 2; RF processing unit 2 arrives aerial array 3 through eight passages with radio signal transmission, is launched according to the descending sequential of standard is unified by two groups of antenna array tuples in the aerial array 3.
Step 205, baseband processing unit 1 obtain fixedly weights.
In this step, for 4 antennas of each polarised direction produce one group of broadcast beam weight, 4 antenna broadcast wave beam weights on the different polarised directions are the same.Broadcast beam weight is not that the double polarization array antenna system produces in real time, but (off-line) is stored in the double polarization array antenna system (as being stored in baseband processing unit 1) with form according to one group of weights of the fixing generation of different sector width in advance.When the network planning clear and definite after the sector width and broadcast beam width of current area, table look-at just can obtain 4 antenna shape-endowing weight values of corresponding arbitrary polarisation direction.
Step 206, baseband processing unit 1 use fixing weights to carrying out weighted from the common channel data that two antenna array tuples of aerial array 3 are launched.
Base band data after step 207, the weighted converts radiofrequency signal into through RF processing unit 2; This radiofrequency signal is launched according to standard time sequence through antenna array tuple 32; And through behind the signal lag device 4 time expand δ (promptly than standard time sequence time-delay δ), through 31 emissions of antenna array tuple.
In the above-mentioned steps 202～204; Baseband processing unit 1 can signal lag device 4 delay time be set to zero; Or enabling signal delayer not; Thereby two groups of antenna array tuples in the aerial array 3 are launched according to the descending sequential of standard is unified simultaneously, be embodied as downlink dedicated channels wave beam associating figuration, its principle can be as shown in Figure 3.The double polarization array antenna system generates shape-endowing weight value in real time through channel estimating, and adopts this weights unification to carry out figuration (promptly uniting figuration) for all bays.Like this; When sending data for certain terminal through dedicated channel; Can obtain the current channel situation of target terminal through carrying out channel estimating, and carry out figuration, thereby carry out figuration to the characteristic of channel of target terminal according to this situation generation shape-endowing weight value; And all array elements through double polarization array antenna receive quality of signals and success rate simultaneously for target terminal transmits thereby improved target terminal.
In the above-mentioned steps 205～207; Baseband processing unit 1 can the signal lag device delay time be set to δ; Or the startup delay time is the signal lag device 4 of δ; Thereby make antenna array tuple 31 ratio antenna array element groups 32 postpone to transmit behind the δ, be embodied as the line delay emission of going forward side by side of common down channel wave beam forming, its principle can be as shown in Figure 4.After obtaining 4 antenna weights of the local storage of double polarization array antenna system; 4 antenna grouping of each polarised direction are independently carried out the wave beam forming operation; But last two group of 4 antenna several chips (instant elongatedness δ) that stagger mutually carried out high specific and merged so that end side can form distinguishable multipath signal launch time.
The constraint criterion that 4 antenna broadcast wave beam weights generate is a lot, the most important thing is that mean receiving power (figuration gain) on all directions is high as far as possible and variance is as far as possible little.
The time elongatedness δ can be set to equate or akin numerical value with the maximum multipath time delay or the corresponding maximum delay of all distinguishable multipaths of actual channel; In order to obtain the time diversity gain better; Preferably, elongatedness δ can be set to maximum multipath time delay or the corresponding maximum delay of all distinguishable multipaths greater than actual channel the time.Through this signal lag device, can realize that the branch collection is sent in the time-delay of MIMO technology.
The downlink data that sends through common signal channel is normally to the data of a plurality of target terminals, thereby adopts fixedly that weights carry out figuration, and can according to the communication system runnability adjust this fixedly weights with the receptivity of As soon as possible Promising Policy target terminal.In order further to improve the receptivity of target terminal; Can realize time delay emission diversity to the delay process of sending signal through the signal lag device; That is, utilize multiple transmit antennas and the time-domain signal of each antenna emission is carried out corresponding delay process, thereby obtain multi-path combined gain; To improve signal receiving performance, as improving performance of BER.
Of above-mentioned flow process, the operation of delay process can be carried out (being equivalent to signal lag device 4 is placed after the RF processing unit 2, as shown in Figure 1) after radio frequency processing.The operation of delay process also can be carried out (be equivalent to place baseband processing unit 1 with signal lag device 4 before) before the Base-Band Processing; At this moment; Need baseband processing unit 1 respectively the data through two groups of bays to be carried out Base-Band Processing, RF processing unit 2 carries out radio frequency processing to the data through two groups of bays respectively.The operation of delay process also can be carried out (being equivalent to signal lag device 4 is placed after the baseband processing unit 1) after Base-Band Processing, at this moment, need RF processing unit respectively the data through two groups of bays to be carried out radio frequency processing.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims (6)

1. self-adaptive data sending method based on double polarization array antenna, said double polarization array antenna comprises the first antenna array tuple and the second antenna array tuple, it is characterized in that, may further comprise the steps:
Said double polarization array antenna receives data to be sent;
Judge that data to be sent are to send or send through common down channel through downlink dedicated channels;
If send through downlink dedicated channels; Channel carries out channel estimating during then to the last line space of said data receiving terminal to be sent; Generate shape-endowing weight value; Utilize said shape-endowing weight value that said data to be sent are carried out weighted, the said first antenna array tuple and the second antenna array tuple are through this channel, according to the data to be sent after the descending sequential transmission weighted of setting;
If send through common down channel; Then utilize preset shape-endowing weight value that said data to be sent are carried out weighted; The said first antenna array tuple is through this channel; According to the data to be sent after the descending sequential transmission weighted of setting, the said second antenna array tuple is passed through this channel, the data to be sent after sending weighted behind the descending sequential time delay setting-up time of this setting.
2. the method for claim 1 is characterized in that, the polarization mode that the first antenna array tuple and the second antenna array tuple are adopted is mutually orthogonal.
3. the method for claim 1 is characterized in that, said setting-up time is a plurality of chip time spans.
4. double polarization array antenna system; It is characterized in that; Comprise baseband processing unit, RF processing unit, dual-polarized antenna array; Said dual-polarized antenna array comprises the first antenna array tuple and the second antenna array tuple, and the said second antenna array tuple is connected with and is used for the signal lag unit that carries out delay process to transmitting, wherein
Baseband processing unit is used for data to be sent are carried out Base-Band Processing, and judges that data to be sent are to send or send through common signal channel through dedicated channel; If send through dedicated channel; Channel carries out channel estimating during then to the last line space of said data receiving terminal to be sent, generates shape-endowing weight value, utilizes said shape-endowing weight value that said data to be sent are carried out weighted; And the delay time of said signal lag unit is set to zero; If send, then utilize preset shape-endowing weight value that said data to be sent are carried out weighted, and the delay time of said signal lag unit is set to the value greater than zero through common signal channel;
RF processing unit, being used for the data transaction after the Base-Band Processing is radiofrequency signal;
The first antenna array tuple and the second antenna array tuple are used for received RF signal and launch, and wherein, the second bay group of received is through the radiofrequency signal of said signal lag unit delay process.
5. antenna system as claimed in claim 4 is characterized in that said baseband processing unit is further used for, and when judging that data to be sent are when sending through common signal channel, the delay time of said signal lag unit is set to a plurality of chip lengths.
6. antenna system as claimed in claim 4 is characterized in that, the polarization mode that the said first antenna array tuple and the second antenna array tuple are adopted is mutually orthogonal.
CN2008101044514A 2008-04-18 2008-04-18 Self-adaptive data sending method based on dual-polarized array antenna and system thereof Expired - Fee Related CN101562504B (en)

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