CN101938303A - Antenna array and method for transmitting signal of antenna array - Google Patents
Antenna array and method for transmitting signal of antenna array Download PDFInfo
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- CN101938303A CN101938303A CN2009100876039A CN200910087603A CN101938303A CN 101938303 A CN101938303 A CN 101938303A CN 2009100876039 A CN2009100876039 A CN 2009100876039A CN 200910087603 A CN200910087603 A CN 200910087603A CN 101938303 A CN101938303 A CN 101938303A
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Abstract
The invention discloses a method for transmitting signal of an antenna array, comprising the following steps: dividing all antenna arrays in one region into N categories, wherein N is not less than 2, and two antenna arrays adjacent to UE belong to different category; setting different delay parameters for the antenna arrays of different categories; and transmitting signal to UE by the antenna array after receiving the signal sent by a base station. The invention further discloses an antenna array, comprising a signal receiving unit, a delay unit and a signal transmitting unit. The antenna array and the method for transmitting signal of an antenna array are capable of preventing the counteraction of the signals from different antenna arrays received by UE, thereby improving the demodulating performance of signal.
Description
Technical field
The present invention relates to a kind of antenna array scheme, relate in particular to aerial array and antenna array signals launching technique in a kind of high-speed railway.
Background technology
In whole 3G network covered, the covering of high-speed railway was the part that can not or lack.As a kind of special high speed scene, sub-district (Cell) is along the line the covering at high-speed railway, in the high-speed railway networking plan, a plurality of sub-districts are by linear array, there are a plurality of distributed aerial arrays the base station in each sub-district, lay respectively on a plurality of different control towers, launches identical signal.Therefore, each subscriber equipment in this sub-district (UE, User Equipment) can be received the same signal that the different antennae array emission on a plurality of control towers comes.
In the prior art, in sub-district the emission of different antennae array synchronous fully, the signal that UE receives is the stack of the signal that comes of the aerial array emission from the different control towers, UE utilizes the composite signal after the stack to carry out channel estimating and demodulation.The aerial array on two control towers adjacent with UE, the signal that other aerial array emission comes is because remote with the distance of UE, and it is very big to decay, and can ignore usually.
In the middle of UE was in two control towers, promptly when the distance of two aerial arrays on these two control towers equated, the power of the signal of two aerial array emissions was identical, and arrives UE simultaneously.At this moment, because the phase place of these two signals is fully independently, composite signal equals the stack of two constant powers and phase place random signal, therefore a large amount of anti-phase counteractings can occur.
With aerial array 1 and aerial array 2 is example, aerial array 1 S1 that transmits:
Aerial array 2 S2 that transmits:
Then UE receives composite signal S:
Wherein, A
iBe signal amplitude, θ
iBe signal phase.Shown in Fig. 1, Fig. 2 a to Fig. 2 c, be respectively signal S
1With signal S
2The synthetic schematic diagram of signal and the signal time domain schematic diagram of UE received signal, wherein, ordinate is A
iAbsolute value | A
i|, abscissa is time t, unit is a chip.And ought arrive UE, the i.e. amplitude A of two signals simultaneously as seen,
1With A
2The mould value close, when approximating A, composite signal
At this moment, if phase theta
1With θ
2Nearly (2k+1) π of differential, wherein k is an integer, the power of composite signal is very little, and is almost nil, is equivalent to received signal and experienced once decay fast, the demodulation performance of signal is very poor.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of aerial array and antenna array signals launching technique, and the anti-phase counteracting from the signal of different antennae array that can avoid that the UE side joint receives improves the demodulation performance of signal.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of antenna array signals launching technique, this method comprises:
All aerial arrays in the same sub-district are divided into the N class, wherein, N 〉=2, and two aerial arrays adjacent with user equipment (UE) belong to a different category;
For different classes of aerial array is provided with different delay parameters;
After receiving the signal of sending the base station, after the time-delay of each aerial array process self correspondence, transmit to UE.
In the technique scheme, described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and described non-zero delay parameter was provided with according to the time interval between channel delay expansion, signal.
Described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal.
The classification of described aerial array is carried out according to the position number of aerial array.
Described N equals 2, and aerial array is respectively odd number aerial array and even number aerial array.
The delay parameter of described even number aerial array is the zero propagation parameter, and the delay parameter of odd number aerial array is the non-zero delay parameter; Perhaps
The delay parameter of described odd number aerial array is the zero propagation parameter, and the delay parameter of even number aerial array is the non-zero delay parameter.
The present invention also provides a kind of aerial array, comprising: signal receiving unit, delay unit and signal transmitter unit; Concrete:
Signal receiving unit is used to receive the signal that send the base station;
Delay unit, be used for according to set in advance with the corresponding delay parameter of aerial array classification, forward delay interval instructs to the signal transmitter unit;
The signal transmitter unit is used for according to the time-delay command received, carry out set time-delay after, the signal that the base station is sent sends to the UE in this aerial array sub-district of living in.
In the technique scheme, described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and described non-zero delay parameter was provided with according to the time interval between channel delay expansion, signal.
Described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal.
Compared with prior art, the present invention is by being provided with delay parameter in aerial array, thereby when UE equates with the distance of adjacent two aerial arrays, though the transmitting power of two aerial arrays is suitable, but owing to stagger launch time, therefore the anti-phase counteracting from the signal of different antennae array of having avoided that the UE side joint receives can not cause the quick decay of signal, has obviously improved the demodulation performance of signal.
Description of drawings
Fig. 1 is signal S
1With signal S
2The synthetic schematic diagram of signal;
Fig. 2 a is the signal time domain schematic diagram of UE received signal S1;
Fig. 2 b is the signal time domain schematic diagram of UE received signal S2;
Fig. 2 c is the signal time domain schematic diagram that UE receives composite signal S;
Fig. 3 is the schematic flow sheet of antenna array signals launching technique of the present invention;
Fig. 4 postpones the structural representation of emission for aerial array;
Fig. 5 a is the signal time domain schematic diagram of UE received signal S1 of the present invention;
Fig. 5 b is the signal time domain schematic diagram of UE received signal S2 of the present invention;
Fig. 5 c receives the signal time domain schematic diagram of composite signal S for UE of the present invention.
Embodiment
Basic thought of the present invention is: by in belonging to the aerial array of same sub-district delay parameter being set, launch same signal in the different moment to UE with equidistant adjacent two aerial arrays of UE, thereby the anti-phase counteracting from the signal of different antennae array of having avoided that the UE side joint receives has improved the tonality of separating of composite signal.
When transmitting, belong to same sub-district different antennae array emission be same signal, one of them aerial array postpones several chips (chip) than another to be launched again, and the time of delay is by the parameter settings such as the time interval between channel delay expansion, signal.Like this, stagger in time domain in the main footpath that transmits of two aerial arrays receiving of UE.The signal that sends from two aerial arrays that arrives same UE can be regarded as two multipath signals of same signal, stagger in time, thereby avoided the quick decay that causes because of stack, UE can make full use of many footpath energy by receiving algorithms such as existing joint-detection.
Fig. 3 is the schematic flow sheet of antenna array signals launching technique of the present invention, and as shown in Figure 3, this method comprises:
In this step, aerial array can be classified according to position number;
In this step, described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and the zero propagation parameter is that the time delay parameter is zero; Described non-zero delay parameter is according to the parameter settings such as the time interval between channel delay expansion, signal; Described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal; The time interval between described signal is the inverse of the rate of information throughput.
Further, UE receives the signal that each aerial array is sent, and carries out channel estimating and demodulation according to composite signal.
Further specify antenna array signals launching technique of the present invention below in conjunction with the drawings and specific embodiments.
In the present embodiment, classification number N=2, the inventive method comprises:
Step 11, with all aerial arrays number consecutively along the line in the same sub-district, and be divided into two classes: even number aerial array and odd number aerial array by numbering;
Step 12, be respectively the odd number aerial array and the even number aerial array is provided with delay parameter, wherein, the delay parameter of even number aerial array is zero, and the delay parameter of odd number aerial array is greater than the channel delay expansion and less than the time interval between signal;
Step 13, receive the signal of sending the base station after, the even number aerial array transmits to UE according to current timing information, and after the time-delay of odd number aerial array through self correspondence, launches this signal to UE.
Further, the signal that UE reception odd number aerial array and even number aerial array are sent carries out channel estimating and demodulation according to composite signal.
In the foregoing description, delay parameter that also can the odd number aerial array is set to zero, and even number aerial array delay parameter is set to greater than the channel delay expansion and less than the time interval between signal.
The structural representation that Fig. 4 postpones emission for aerial array as shown in Figure 4, after the time-delay of odd number aerial array through setting, sends to UE with signal.
Among this embodiment, if only consider the signal that adjacent odd number aerial array and even number aerial array are sent, the signal that other aerial array emission comes is because remote with the distance of UE, and it is very big to decay, and ignores.Then concrete aerial array transmit and UE received signal situation as follows:
Supposing that channel delay expands to 4 chips, is 5 chips at the delay parameter of odd number aerial array setting, is 0 chip at the delay parameter of even number aerial array setting, and promptly the even number aerial array is not delayed time.At t constantly, aerial array 2 transmits to UE; After the time-delay through 5 chips, aerial array 1 is to the same signal of UE emission.Through after the multipath channel, the signal of the aerial array 2 that UE receives is shown in Fig. 5 a, the signal of the aerial array 1 that UE receives is shown in Fig. 5 b, Fig. 5 c is the signal time domain schematic diagram that UE receives composite signal S, shown in Fig. 5 c, after the time-delay through 5 chips, two paths of signals does not overlap on time domain, therefore can not cause the anti-phase counteracting of same signal.
The present invention also provides a kind of aerial array, comprising: signal receiving unit, delay unit and signal transmitter unit; Concrete:
Signal receiving unit is used to receive the signal that send the base station;
Delay unit, be used for according to set in advance with the corresponding delay parameter of aerial array classification, forward delay interval instructs to the signal transmitter unit;
The signal transmitter unit is used for according to the time-delay command received, carry out set time-delay after, the signal that the base station is sent sends to the UE in this aerial array sub-district of living in.
Described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and described non-zero delay parameter is according to the parameter settings such as the time interval between channel delay expansion, signal.
Described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal.
Utilize signal delay launch scenario of the present invention in the high-speed railway radio communication, avoided the anti-phase counteracting with the same signal of equidistant adjacent two aerial arrays emission of UE, it is convenient to realize, performance improvement is remarkable.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1. an antenna array signals launching technique is characterized in that, this method comprises:
All aerial arrays in the same sub-district are divided into the N class, wherein, N 〉=2, and two aerial arrays adjacent with user equipment (UE) belong to a different category;
For different classes of aerial array is provided with different delay parameters;
After receiving the signal of sending the base station, after the time-delay of each aerial array process self correspondence, transmit to UE.
2. antenna array signals launching technique according to claim 1 is characterized in that, described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and described non-zero delay parameter was provided with according to the time interval between channel delay expansion, signal.
3. antenna array signals launching technique according to claim 2 is characterized in that, described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal.
4. according to claim 1 or 3 described antenna array signals launching techniques, it is characterized in that the classification of described aerial array is carried out according to the position number of aerial array.
5. antenna array signals launching technique according to claim 4 is characterized in that described N equals 2, and aerial array is respectively odd number aerial array and even number aerial array.
6. antenna array signals launching technique according to claim 5 is characterized in that, the delay parameter of described even number aerial array is the zero propagation parameter, and the delay parameter of odd number aerial array is the non-zero delay parameter; Perhaps
The delay parameter of described odd number aerial array is the zero propagation parameter, and the delay parameter of even number aerial array is the non-zero delay parameter.
7. an aerial array is characterized in that, comprising: signal receiving unit, delay unit and signal transmitter unit; Concrete:
Signal receiving unit is used to receive the signal that send the base station;
Delay unit, be used for according to set in advance with the corresponding delay parameter of aerial array classification, forward delay interval instructs to the signal transmitter unit;
The signal transmitter unit is used for according to the time-delay command received, carry out set time-delay after, the signal that the base station is sent sends to the UE in this aerial array sub-district of living in.
8. aerial array according to claim 7 is characterized in that, described delay parameter is divided into zero propagation parameter and non-zero delay parameter, and described non-zero delay parameter was provided with according to the time interval between channel delay expansion, signal.
9. aerial array according to claim 8 is characterized in that, described non-zero delay parameter is greater than the channel delay expansion and less than the time interval between signal.
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Citations (5)
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| CA2465775A1 (en) * | 2004-04-27 | 2005-10-27 | Piping Hot Networks, Ltd. | Multiple input multiple output (mimo) wireless communications system |
| CN101282198A (en) * | 2007-04-05 | 2008-10-08 | 大唐移动通信设备有限公司 | Transmission method and terminal for upstream multi-antenna in TDD system |
| CN101359947A (en) * | 2007-07-30 | 2009-02-04 | 大唐移动通信设备有限公司 | Broadcast wave bean shaping method and apparatus for multi-antenna array system |
| CN101388701A (en) * | 2007-09-10 | 2009-03-18 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
-
2009
- 2009-06-30 CN CN2009100876039A patent/CN101938303A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426187A (en) * | 2001-12-19 | 2003-06-25 | 深圳市中兴通讯股份有限公司上海第二研究所 | Method and device for space-time diversity transmitting based on intelligent autema CDMA system |
| CA2465775A1 (en) * | 2004-04-27 | 2005-10-27 | Piping Hot Networks, Ltd. | Multiple input multiple output (mimo) wireless communications system |
| CN101282198A (en) * | 2007-04-05 | 2008-10-08 | 大唐移动通信设备有限公司 | Transmission method and terminal for upstream multi-antenna in TDD system |
| CN101359947A (en) * | 2007-07-30 | 2009-02-04 | 大唐移动通信设备有限公司 | Broadcast wave bean shaping method and apparatus for multi-antenna array system |
| CN101388701A (en) * | 2007-09-10 | 2009-03-18 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
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Application publication date: 20110105 |