CN105790821A - Equipment for improved isolation characteristic in telecommunication system - Google Patents
Equipment for improved isolation characteristic in telecommunication system Download PDFInfo
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- CN105790821A CN105790821A CN201610286144.7A CN201610286144A CN105790821A CN 105790821 A CN105790821 A CN 105790821A CN 201610286144 A CN201610286144 A CN 201610286144A CN 105790821 A CN105790821 A CN 105790821A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses equipment (100) for an improved isolation characteristic in a telecommunication system. The equipment comprises an at least first-polarized first antenna (110) and a second-polarized second antenna (120). The equipment (100) also comprises a receiver (130) and a transmitter (140). And the equipment aims at carrying out communication with at least one other device in the wireless telecommunication system. The equipment (100) is equipped with devices (150, 204) for estimating a polarization state of a signal which is received from the other device, and the equipment (100) comprises devices (160, 206) for adapting the polarization state of the signal transmitted from the equipment (100) to the other device on the basis of an estimation value of the received signal.
Description
Technical field
The present invention relates to the equipment in radio telecommunications system, described equipment be intended to for at least one the miscellaneous equipment communication in radio telecommunications system.This equipment includes Receiver And Transmitter and the second antenna of the first antenna of at least the first polarization and the second polarization.
Background technology
In the current system for aerogram, such as in a cellular telephone, the transmitter of system, specifically those transmitters in a base station, it is possible to equipped with dual polarized antenna.Generally, this is to utilize the polarization of wireless channel for polarization reception diversity, supplementing as space diversity in a base station, or substitutes the space diversity in base station.
Generally at equipment--namely, the base station in this example--one of them antenna on perform transmission, but under the occasion using two antennas, there is also polarization and sending diversity.In some cases, two antennas in base station are used in transmitting, and the half (or certain other parts) of signal is launched via an antenna, and remaining part is launched via another antenna.The purpose that such transmission arranges is to reduce the combined loss when wireless channel is likely to occur after power amplification when base station combines.
When using the antenna with identical or almost identical polarization, transmission diversity as such as closed loop TX diversity in wcdma, it is seen as wave beam manipulation (beamsteering) based on feedback.When using the antenna with orthogonal or almost orthogonal polarization, closed loop TX diversity can substitute for being looked at as polarization adaptation.Without feedback information, it is possible to use uplink measurement is for adaptive downlink transmission.
Such as, in the case of beam steering, the array antenna with multiple radiating element identical close to interval is used, it is possible to control downlink beamforming based on up-link arrival direction valuation.
Summary of the invention
It is an object of the invention to utilize the information of the polarization characteristic about wireless channel, including those information of reception antenna, improve the performance of wireless connections.
This purpose is reached by the present invention, the invention discloses the equipment in radio telecommunications system, and described equipment includes the first antenna of at least the first polarization and the second antenna of the second polarization and receiver block and transmitter block.
Described equipment be intended to for at least one miscellaneous equipment communication in wireless telecommunication systems, and described equipment is provided with in estimating the device of the polarized state of signal that receives from miscellaneous equipment.
Described equipment comprises additionally in control device, for described measurement and the available auxiliary information of the signal based on reception, such as from controlling signaling and the information of systematic function measurement extraction, the polarized state of the adaptive signal being sent to a miscellaneous equipment from described equipment.
Therefore, by means of the equipment of the present invention, the polarization characteristic of wireless channel can be utilized to improve the transmission quality of wireless connections.
Accompanying drawing explanation
It is more fully described the present invention with reference to the accompanying drawings, wherein:
Fig. 1 illustrates the polarization controller used in the present invention, and
Fig. 2 illustrates general polarization controller, and
Fig. 3 be shown in a version of the present invention use so-called Poincar é ball, and
Fig. 4 illustrates the indicative flowchart for performing the present invention.
Detailed description of the invention
With reference to cell phone system, the present invention will be described in the following description, result, being the communication carried out between wireless base station RBS and terminal UE (subscriber equipment) by the communication of description, RBS utilizes two antenna ports corresponding to having not like-polarized two antennas.
But, it will be appreciated by persons skilled in the art that this is only an example；The present invention can be applied to many communications applications, for instance, the communication between RBS and transponder or via node.And, can utilize at one or two end place of communication system and there is not like-polarized plural antenna.Further, it is noted that the either end of communication, i.e. RBS and/or UE, it is possible to equipped with the equipment according to the present invention.Natural, the two ends of communication also can be provided with such equipment.
Referring again to cell phone system in the example that will be used, term up-link (UL) will be used for referring to the communication from UE to RBS, and term downlink (DL) refers to the communication from RBS to UE by being used for.
Unless otherwise noted, it is assumed that UE uses identical polarized state to be used for receiving and transmitting.But, generally, UE can use any polarized state, because auxiliary polarization controls information, such as DL power control command, can use for RBS.
Although the present invention is at two entities, wireless communication link detailed description between RBS and UE, but it is to be understood that, the present invention can also be applied to have system any number of, communication link between RBS and UE, such as, as in mimo systems, the present invention can be applied to such as each flow of information wherein.
Fig. 1 illustrates the schematic block diagram of the equipment 100 of the present invention.In the equipment 100 of the present invention, it is assumed that equipment 100 is equipped with the second antenna 120 of at least the first first antenna 110 polarized and the second polarization, and antenna 110 and 120 is typically implemented as dual polarized antenna.Suitably, the two polarization is horizontal and vertical respectively, as shown in Figure 1, although being likely to use other combination of polarization in perfect situation, they need not be mutually orthogonal, but must be different.
Beyond described antenna 110,120, this equipment also includes receiver block 130 and transmitter block 140, and each piece comprises one or more radio chains.Equipment 100 be intended to for at least one the miscellaneous equipment communication in the radio telecommunications system of such as cell phone system etc.
Equipment 100 is further equipped with the device 150 of the polarized state for measuring the signal from the reception of one miscellaneous equipment and for measuring device 160 that is adaptive or that control to be sent to the polarized state of the signal of one miscellaneous equipment from described equipment according to the described of received signal.Described measurement and polarization control devices 150,160 can be same functional devices in device 100, as it is shown in figure 1, or they can be functional device separately in device 100 or physical entity separately.
The function of measurement apparatus 150 and polarization control devices 160 is the polarization adaptation of the signal sent from equipment 100 by transmitter 140 to the polarized state by improving communication quality.
Described adaptation is to carry out by means of weight or weight factor are applied to each signal sent from the first and second antennas by transmitter 130.Weight factor can be pure phase location factor, or they can also include amplitude factor, in order to change Relative Signal Amplitude.Therefore, different phase and amplitude weights will be given in polarization control devices 160 by means of the copy of the signal that the antenna of the one 110 and the 2nd 120 polarization sends before it arrives antenna by the transmitter 140 of equipment 100, this total polarization wanted that will the signal that be sent by antenna had finally give, for instance with the consistent polarization that polarizes measured at UL place.
The weight being used in the signal of transmission adapts in the meaning wanted, for instance for output, utilizes system in optimal manner, and polarizing control can use different types of input.In the case described above, wherein unique input is polarized state on the ul-signal, and the target of polarizing control is so that the polarization optimization for DL transmission.
If when further inputs are available, all as described in more detail below, polarization control process for DL transmission can be based on the criterion different from replicating UL polarized state, such as separately for each UE, or the DL through-put power for each community in cell phone system minimizes.It that case, the polarized state on DL is not necessarily identical with the polarized state on UL.
Fig. 2 illustrates the generic polarization controller 200 used in a transmitter of the invention, and it can be employed to obtain previously described and the unit 150 and 160 shown in Fig. 1 function.One or more weight factors that polarization controller 200 transmission is previously mentioned, that to use in signals to be transmitted are as its output 250.Polarization controller 200 comprises two major function blocks.In the first functional device 204--UL polarization estimator, estimate or measure UL polarized state, and in the second functional device 206--DL polarization controller, calculating the weight for DL transmission.
The parameter used by polarization controller 200 is that the UL being previously mentioned measures, and they are illustrated as the input 210 to control unit 200.
Apart from the ul channel measurements 210, other parameter for being input to polarization controller 200 may is that
UL base station coherency information, such as the phase and amplitude characteristic of RBS when receiving.This is the input 220 to polarization estimator 204.
DL base station coherency information, in other words, the such as phase and amplitude characteristic of RBS when transmission.This is the input 230 to DL polarization controller 206.
DL power control command, i.e. from a miscellaneous equipment to the power command of RBS.This is the input 240 to DL polarization controller 206.
Information about the antenna configurations at UE place.The example of such information can be whether same antenna is used in reception and transmits, and is used in the number of the antenna of reception, if greater than the words of 1.
In order to find UL and DL base station coherency information, the calibration function in RBS it is appropriately carried out measuring.
All parameters listed above need to be considered by the polarization controller 200 of Fig. 2, in order to reach the good polarization adaptation of the signal sent.
When it is attributed to polarization controller 200 available information and during due to the output control device steps taken of this information, it is possible to distinguish many situations.These situations will below by using definition given below to be described:
Channel: this term be taken as below refer to the present invention equipment with and that it communicates, another one equipment between the feature of propagation path.
Correlated channels: the amplitude of polarization components and phase value are relevant within the sufficiently long time and in sufficiently wide frequency band, so, the channel measurement performed on UL is effective for the use on DL.
Power-correlated channel: amplitude relation between the polarizations is relevant within the sufficiently long time and in sufficiently wide frequency band, so, the channel measurement performed on UL is effective for the use on DL.
Non-correlation channel: it is invalid that the channel polarization state performed on UL is measured for the use on DL.
Coherent base station: be sufficiently known for being used in the amplitude of the radio chains of UL, phase place and time-delay characteristics.It is sufficiently known for being used in the amplitude of the radio chains of DL, phase place and time-delay characteristics.
Amplitude coherent base station: be sufficiently known for being used in amplitude and the time-delay characteristics of the radio chains of UL.It is sufficiently known for being used in amplitude and the time-delay characteristics of the radio chains of DL.
Phase coherent base station: be sufficiently known for being used in phase place and the time-delay characteristics of the radio chains of UL.It is sufficiently known for being used in phase place and the time-delay characteristics of the radio chains of DL.
Non-coherent base station: be not sufficiently known for being used in amplitude and the phase characteristic of the radio chains of UL.It not sufficiently known for being used in amplitude and the phase characteristic of the radio chains of DL.
The example of the situation that wherein can apply the present invention is given below, and how the present invention is applicable to the explanation of each situation.The flow chart 400 of Fig. 4 that these situations relate to below is schematically shown.
Situation 1, correlated channels, coherent base station
In this case, this is corresponding to the square 425 of Fig. 4, and the polarized estimator 204 of polarized state receiving signal is observed, and is imported into DL polarization controller 206.Polarization estimator 204 and DL polarization controller 206 consider the amplitude of known RBS, phase place and time-delay characteristics.
The DL polarization controller 206 of Fig. 2 can have other input being different from UL channel measurement, such as DL power control command.
Situation 2, correlated channels, amplitude coherent base station
In this case, this is corresponding to the square 435 of Fig. 4, and due to the unknown phase relation between polarization, in the polarized state observed by polarization estimator 204, only range weight can be used by DL polarization controller 206.Polarization estimator 204 and DL polarization controller 206 consider amplitude and the time-delay characteristics of known RBS.
Owing to the phase characteristic of base station is unknown, DL polarization controller 206 must have other input being different from UL channel measurement, such as DL power control command etc., in order to support according to the criterion wanted on DL, such as transmitting power, searches for the phase value by producing best polarized state.
Relative phase values can be found by the search of (N-1) dimension, and wherein N is the number of the polarization used on UL and DL, i.e. N=2 in this example.In other words, the equipment of the present invention will be used for sending the multiple different phase shifts between two polarization that signal uses, and such as it will be observed that from the PL power control command of UE.DL polarization controller 206 monitors systematic function and regulates phase shift, in order to adapt to the time change in propagation channel.
In the case of a dual polarized antenna having orthogonal polarizations, adaptation procedure be seen as corresponding to along on the ball surface of the so-called Poincar é ball shown in Fig. 3, corresponding to the best polarization of the line search of constant relative amplitude.For fine adjustment, search for the different value of the amplitude relation that best polarized state can also be included between the signal of each polarization.
Situation 3, correlated channels, phase coherent base station
In this case, this is corresponding to the square 445 of Fig. 4, and due to the unknown amplification relation between polarization, polarization estimator 204 in the polarized state observed on UL, only phase component can be used by DL polarization controller 206.Polarization estimator 204 and DL polarization controller 206 consider phase place and the time response of known RBS.
Owing to the amplitude characteristic of base station is unknown, DL polarization controller 206 must have other input being different from UL channel measurement, such as DL power control command etc., in order to support according to the criterion wanted on DL, such as transmitting power, searches for the range value by producing best polarized state.
Relative amplitudes can be found by the search of (N-1) dimension, and wherein N is the number of the polarization used on UL and DL, i.e. N=2 in this example.In other words, the equipment of the present invention will be used for sending the multiple different amplitude relation between two polarization that signal uses, and such as it will be observed that from the DL power control command of UE.DL polarization controller 206 monitors systematic function and amplitude of accommodation relation, in order to adapt to the time change in propagation channel.
In the case of a dual polarized antenna having orthogonal polarizations, adaptation procedure be seen as corresponding to along on the ball surface of the so-called Poincar é ball shown in Fig. 3, corresponding to the best polarization of the line search of constant relative phase.For fine adjustment, search for the different value of the phase relation that best polarized state can also be included between the signal of each polarization.
Situation 4, correlated channels, non-coherent base station
In this case, base station is neither amplitude neither phase coherence, it is meant that, the polarized state that polarization estimator 204 is observed is typically not the correct valuation of actual polarization state.But, the information that estimator is still provided with, the arbitrary order derivative of such as observable estimator.Therefore, although base station is noncoherent, but still can utilize channel reciprocity (channelreciprocity).
Polarization adaptation process comprises search in the meaning wanted, for instance for polarization weights best output, square 450, searches for and performs in hyperspace, i.e. more than one parameter is change.Adaptation procedure is such as by the derivative support of the DL power control command from UE and the observable from polarization estimator 204, in order to strive for best possible DL weight continuously.
In the case of a dual polarized antenna having orthogonal polarizations, adaptation procedure is seen as searching for best polarization corresponding to along on the ball surface of the so-called Poincar é ball shown in Fig. 3, two orthogonal directions.In other words, in this case, all correlation combiner of two orthogonally polarized signals will be attempted.The size of the region of search on Poincar é ball and DL polarization controller 206 renewal rate, be all based on such as from the derivative of the DL power control command of UE and the observable from polarization estimator 204.
Situation 5, the situation of simplification
Overview can be carried out: with horizontally or vertically polarizing, and the polarized state of the radio wave only sent with these polarization, it is maintained to a large extent on many propagation channels.This causes the principle of the simplification for time-varying polarizing control: by using horizontal or vertical polarization, for instance which of these polarization to be polarized on UL according to and has the highest mean power, performs DL transmission.
This situation, for instance when channel is irrelevant between UL and DL maybe when hope has the solution of low-complexity, be applicable.
Even if in this simplified case, it should use polarization controller 200 as shown in Figure 2.Adaptation procedure can use different types of input.Such as, if input is only which polarized state (horizontally or vertically) has the highest power on UL, then target is typically used to this polarized state for DL transmission.
In coherent base station, the principle for the simplification of time-varying polarizing control can be used in the following manner: for any dual polarized antenna, the UL signal received is transformed into vertically and horizontally polarized state, and estimates the mean receiving power in each state.The polarization (horizontally or vertically) with the highest average UL power is selected to transmit for DL.
Only having in the base station of amplitude coherent wherein, the simplified pinciple for time-varying polarizing control can instead be used in the following manner: for having the dual polarized antenna of vertically and horizontally polarized state, estimates the mean receiving power in each state.The polarization with the highest average UL power is selected to transmit for DL.
Basis for polarizing control
If other input is available, then can be based on and the ground of UE one by one or carry out DL transmitting power by each community and minimize different criterions for the polarization adaptation process of DL transmission.Other criterion such as can be based on SNR, Signal Interference and Noise Ratio.
Claims (24)
1. an equipment (100) in wireless telecommunication systems, described equipment (100) includes the first antenna (110) of at least the first polarization and second antenna (120) of the second polarization, described equipment (100) also includes receiver block (130) and transmitter block (140), described equipment (100) be intended to for at least one miscellaneous equipment communication in wireless telecommunication systems, wherein said equipment (100) is provided with the device (200) in polarization adaptation
It is characterized in that, the described device for polarization adaptation is configured to receive the certain parameter including the feedback from one miscellaneous equipment, and based on described certain parameter the polarization adaptation of the signal sent from described transmitter block to the polarized state by improving communication quality.
2. equipment (100) as claimed in claim 1, wherein, the described device for polarization adaptation is poor to the signal application phase being sent to one miscellaneous equipment by the different antennae of described transmitter block.
3. equipment (100) as claimed in claim 1, wherein, the described device for polarization adaptation includes:
-uplink polarization estimator (150,204), for estimating the polarized state of the signal received from one miscellaneous equipment, and
-downlink polarization controller (160,206), for based on estimated polarized state, adaptation is sent to the polarized state of the signal of one miscellaneous equipment from described equipment (100).
4. equipment (100) as claimed in claim 1, wherein, described certain parameter includes up-link and downlink base station coherency information, and described polarization adaptation is based on the phase coherence information polarization adaptation strategy different with amplitude coherent information and executing.
5. the equipment (100) as described in any one of claim 1-4, wherein, described parameter includes the information about the antenna configurations at one miscellaneous equipment place.
6. the equipment (100) as described in any one of claim 1-4, wherein, described parameter includes the information of the dependency about channel.
7. the equipment (100) as described in any one of claim 1-4, wherein, the adaptive polarized state of the signal sent obtains by means of the copy of signal weight factor being applied separately to from the first (110) and second (120) antenna transmission.
8. the equipment as described in any one of claim 1-4, wherein, the device (160,206) of the polarized state of signal for controlling to send from described equipment (100) includes from the input for estimating to receive the device (150,204) of the polarized state of signal.
9. the equipment as described in any one of claim 1-4, wherein, described certain parameter will use in polarization adaptation process.
10. equipment as claimed in claim 6, wherein, described certain parameter includes the antenna configurations of UE, and this antenna configurations specifies that UE is used for the number of the antenna communicated with base station, and this number is more than 1.
11. the method used in an equipment in wireless telecommunication systems, there are at least the first first antenna polarized (110) and second antenna (120) of the second polarization in the apparatus, also have receiver block (130) and transmitter block (140) in the apparatus, described method is directed at when described equipment (100) communicates with at least one miscellaneous equipment in wireless telecommunication systems to use
It is characterized in that, described method includes:
Receive the certain parameter including the feedback from one miscellaneous equipment, and based on described certain parameter the polarization adaptation of the signal sent from described transmitter block to the polarized state by improving communication quality.
12. method as claimed in claim 11, wherein, described polarization adaptation is poor to the signal application phase being sent to one miscellaneous equipment by the different antennae of described transmitter block.
13. method as claimed in claim 11, wherein, described method is further comprising the steps of:
The polarized state of the signal that-estimation receives from one miscellaneous equipment at described equipment (100) place, and
-based on estimated polarized state, the polarized state of the adaptive signal being sent to one miscellaneous equipment from described equipment (100).
14. method as claimed in claim 11, wherein, described certain parameter includes up-link and downlink base station coherency information, and described polarization adaptation is based on the phase coherence information polarization adaptation strategy different with amplitude coherent information and executing.
15. the method as described in any one of claim 11-14, wherein said parameter includes the information about the antenna configurations at one miscellaneous equipment place.
16. the method as described in any one of claim 11-14, wherein said parameter includes the information of the dependency about channel.
17. the method as described in any one of claim 11-14, the described polarization adaptation of the signal wherein sent be by means of weight factor be applied separately to from described equipment (100) first (110) and second (120) antenna send signal replication product and obtain.
18. the method as described in any one of claim 11-14, if wherein the phase characteristic of described equipment (100) is unknown, then perform search to by the phase value producing to send the best polarized state of signal.
19. the method as described in any one of claim 11-14, if wherein the amplitude characteristic of described equipment (100) is unknown, then perform search to by the range value producing to send the best polarized state of signal.
20. the method as described in any one of claim 11-14, if wherein the amplitude of described equipment (100) and phase characteristic neither one are known, then to sending the amplitude of best polarized state of signal by producing and the combination of phase value performs search.
21. method as claimed in claim 18, wherein by using downlink power control command to perform search.
22. the method as described in any one of claim 11-14, wherein polarization adaptation is by estimating that mean receiving power in each first and second antenna and selection have the antenna of the highest mean power and be performed for being sent by described equipment (100).
23. the method as described in any one of claim 11-14, wherein, described certain parameter will use in polarization adaptation process.
24. method as claimed in claim 15, wherein, described certain parameter includes the antenna configurations of UE, and this antenna configurations specifies that UE is used for the number of the antenna communicated with base station, and this number is more than 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286144.7A CN105790821A (en) | 2006-07-06 | 2006-07-06 | Equipment for improved isolation characteristic in telecommunication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286144.7A CN105790821A (en) | 2006-07-06 | 2006-07-06 | Equipment for improved isolation characteristic in telecommunication system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800552477A Division CN101479959A (en) | 2006-07-06 | 2006-07-06 | A device for improved isolation characteristics in a telecommunications system |
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| CN105790821A true CN105790821A (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610286144.7A Pending CN105790821A (en) | 2006-07-06 | 2006-07-06 | Equipment for improved isolation characteristic in telecommunication system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030092402A1 (en) * | 2000-01-27 | 2003-05-15 | Joseph Shapira | System and method for providing polarization matching on a cellular communication forward link |
| CN1467942A (en) * | 2002-05-28 | 2004-01-14 | ��˹��ŵ�� | Method of using pilots in radio system and radio system |
| WO2004015887A1 (en) * | 2002-08-05 | 2004-02-19 | Nokia Corporation | Transmission diversity with two cross-polarised antennas arrays |
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2006
- 2006-07-06 CN CN201610286144.7A patent/CN105790821A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030092402A1 (en) * | 2000-01-27 | 2003-05-15 | Joseph Shapira | System and method for providing polarization matching on a cellular communication forward link |
| CN1467942A (en) * | 2002-05-28 | 2004-01-14 | ��˹��ŵ�� | Method of using pilots in radio system and radio system |
| WO2004015887A1 (en) * | 2002-08-05 | 2004-02-19 | Nokia Corporation | Transmission diversity with two cross-polarised antennas arrays |
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