CN100488306C - Apparatus and method for inhibiting interference between wireless systems - Google Patents
Apparatus and method for inhibiting interference between wireless systems Download PDFInfo
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- CN100488306C CN100488306C CNB2006100583068A CN200610058306A CN100488306C CN 100488306 C CN100488306 C CN 100488306C CN B2006100583068 A CNB2006100583068 A CN B2006100583068A CN 200610058306 A CN200610058306 A CN 200610058306A CN 100488306 C CN100488306 C CN 100488306C
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Abstract
The method comprises: the cancellation device firstly determines the time interval in which the system of the receiving channel cancels the interference between antennas; dividing the time interval into more than one sub time intervals; in each sub time interval, the transmitting channel capable of interfering the receiving channel is identical; in each sub time interval, reading the transmitting data from the baseband processing unit of each transmitting channel; during each time interval, using each group of transmitting data to respectively estimate each transmitting channel to get the channel character of interference signals in each transmitting channel; according to the interference generated from each transmitting channel, deciding if the congestion happens; if not, using the channel character of interference signals in each transmitting channel to make re-generation of interference signals, and then subtracting the re-generated interference signals from the signals received by the receiving channel so as to cancel the interference.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the method and apparatus of the co-channel interference between the different sectors under adjacent interference frequently between effective inhibition TDD (time division duplex) frequency spectrum and FDD (Frequency Division Duplexing (FDD)) frequency spectrum and the TDD dual-mode.
Background technology
In same geographic area, the interference of how controlling between the antenna for base station is an interior basic problem of moving communicating field.When the antenna for base station of different system was closely laid, the transmitting antenna and the isolation between the reception antenna that are operated in side frequency or same frequency must be protected.
Need to keep between antenna the application scenario of high-isolation to have: 1) when TDD system and FDD system colocation site, the band external leakage that the transmitting power of TDD antenna for base station forms can produce the up reception of FDD and disturb, especially the TDD system works can produce serious disturbance in FDD system uplink frequency range 1920～1980MHz when 1880～1920MHz frequency range; 2) when the TDD system takes many sectors to lay, can be between the different fan antennas of colocation site because of receiving and dispatching synchronous inconsistent generation co-channel interference; 3) (emission for the ease of the control tdd mode produces interference to the reception in the fdd mode when FDD and TDD frequency spectrum are comprehensively used in same base station, tdd mode and fdd mode need adopt its antenna that is fit to separately), also can produce adjacent interference frequently between the antenna that antenna that tdd mode adopts and fdd mode adopt, if when comprehensively using the antenna for base station of FDD and TDD frequency spectrum to take many sectors to lay, can be between the TDD antenna of the different sectors of colocation site because of receiving and dispatching the inconsistent co-channel interference that produces synchronously.
Reduce between the different system, the basic fundamental approach that perhaps disturbs between the subsystem of same system has: 1) stop to disturb to enter system, just guarantee the isolation between system antenna; 2) class is that the interference that enters system is offseted.In the practical application, generally be to adopt to stop to enter to get a desired effect with interference cancellation.
Prior art enters antenna receiving-sending that system aspects takes and isolates measure commonly used and comprise stop disturbing:
1) distance between the increase dual-mode antenna, the increase of distance is to reducing the remarkable result that is coupled with between dual-mode antenna, but, distance between the antenna in the same set of system is subjected to the restriction of actual installation platform, cannot increase arbitrarily, as, the distance on the vehicle-mounted and airborne platform between antenna is subjected to the restriction of carrying platform, distance in the mobile communication system between the antenna will be subjected to mounting platform, the restriction of space body sizes such as roof;
2) reduce the lateral gain of dual-mode antenna.Just antenna takes to reduce the secondary lobe design.In order to reduce secondary lobe, can also add cylinder and absorbing material at the antenna actinal surface, this measure can reduce the secondary lobe 10dB of individual antenna, thereby makes isolation increase 20dB;
3) reduce polarization coefficient, increase polarization isolation, the isolation effect of this method is not very remarkable, generally at 5～10dB;
4) radiation absorbs to side direction to add the absorbability isolated screen between antenna.This quarantine measures make two electromagnetic waves between antenna can not look at transmission straight, thereby isolation effect is very remarkable, can increase the isolation of 20dB.
Said method has more significant effect to the direct coupling between dual-mode antenna, but, except the direct coupling between antenna, also has the environment coupling between antenna, because the path more complicated of environment coupling, the method of eliminating the environment coupling also changes with the application scenario, the typical method that suppresses the environment coupling has: take specific antenna mounting means, as adopting the mode of installing up and down, the front and back mounting means, horizontal mounting means, utilize the platform facade to block etc. all to be the mode of the elimination environment coupling of using always, if near antennae support body, lay absorbing material, also can significantly reduce the environment coupling, generally can make isolation increase 20dB.
The isolation of repeater dual-mode antenna is typical in frequently receiving and dispatching isolation applications.The repeater utilizes the recessed position of antenna sidelobe that the isolation that improves donor antenna and service antenna is had crucial meaning exactly when installing.When normal mounting, the service antenna position is higher, and donor antenna is placed on the service antenna bottom.In used the repeater, when installing space during greater than 15 meters, isolation can reach 90～95dB; When spacing was 1 meter, isolation had 65～70dB.In order further to improve isolation between transmitting and receiving antenna, the repeater is also used absorbing material to be exclusively used in and is solved lobe inhibition problem on the antenna, eliminate antenna sidelobe and back lobe, present commercial absorbing material can reach attenuation by absorption 20db in frequency band 10MHz-3000MHz scope.
In the prior art, the patent of utilizing object to isolate has US20040150580, name is called " method (Method for improvingisolation of an antenna mounted on a structure) that a kind of raising is installed in the isolation between antennas on the structure object ", this patent proposes the object that the use antenna is installed, as casing, physical form improve the isolation of dual-mode antenna.
Utilizing in the prior art polarizes realizes that the patent application that transmitting-receiving is isolated has US20030210194, and name is called: " providing Signal Spacing (Antenna polarization separation toprovide signal isolation) by the antenna polarization separation ".
In some special application fields,, disturb the system that enters to offset by the stack that the antenna place carries out in order to stop as military field.As the airborne active interference cancellation system of Boeing Co. development, this system comprises controller, a large amount of rf processor and deferred mount, and with the interface of other airborne electronic equipment systems, can discern effective signal of communication and invalid electronic jamming signal.Its operation principle is; the interference signal that the communication antenna monitoring aircraft of underbelly sends; after the coupling of communicating by letter with the UHF of self; the active interference cancellation system produces one and offsets signal; the free time stack of the interference signal by offseting the emission of signal and jammer; the protection upper communication antenna is realized enemy's interference and one's own side are carried out communicatedly simultaneously.This interference cancellation system is except protection UHF communication, but also protected data chain and radio communication.
Prior art also has a lot of accumulation aspect interference cancellation, the Multiuser Detection of widely being familiar with in the communications field is exactly a typical example.
What the interference cancellation detector that Multiuser Detection is used was commonly used has two kinds: successive interference cancellation and parallel interference cancellation.Successive interference cancellation (SIC) detector at first sorts according to each the subscriber signal power that receives, undertaken slake is estimated by power each user of inferior ordered pair from high to low then, promptly demodulate the user of peak signal power earlier, deduct this user's signal then from total received signal, each user only offsets once.This method is simple in structure, and computation complexity descends, and the signal that demodulation is come out is relatively accurate.But strengthened time-delay, in case and user's signal power change, also to resequence.The parallel MAI (multiple access interference) that estimates and deduct all users of parallel interference cancellation (PIC) detector.
Guarantee the normal worker of communication system under the contiguous installation situation of antenna, isolation between system will be about 60～100dB, use any one prior art all can't in real system, reach this index at present separately, therefore, the interference of communication system need to suppress comprehensive these technology of using to solve under the contiguous installation situation of antenna.Such as, the interference cancellation technology that in multi-user's monitoring technology, occurs, must under the situation that receiver does not get clogged, just can use, and, the interference cancellation technology that produces in cdma system can't directly apply to the interference cancellation between any system, therefore, need disturb the antenna isolation technology and the intrasystem interference cancellation technology that enter to combine stoping, and carry out comprehensive Design according to the characteristics of system's practical application.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of apparatus and method of disturbing between wireless system of can suppressing effectively.
In order to solve the problems of the technologies described above, the invention provides a kind of method that suppresses to disturb between wireless system, may further comprise the steps:
(a) determine that the affiliated system of the interior receive path of a radio frames need offset the time interval of inter-antenna interference, and it be divided into one or more sub-time intervals that making can be identical to the transmission channel that this receive path generation is disturbed in each sub-time interval;
(b) in a sub-time interval, the baseband processing unit that produces each transmission channel that disturbs from meeting reads the emission data;
(c) with the time slot be unit, use each the group emission data that reads that each transmission channel is carried out channel estimating respectively, obtain the characteristic of channel of each transmission channel interference signal, and carry out Interference Estimation; And comprise the interference that interference strength and/or different antennae produce the time of advent difference parameter measurement, and the parameter of measuring is used to report;
(d) interference that produces according to each transmission channel of estimating judges whether to produce and blocks, if, end to offset processing, finish, otherwise carry out next step;
(e) utilize the characteristic of channel of each transmission channel interference signal to carry out interference signal regeneration, from the received signal of described receive path, deduct these regeneration interference signals then, carry out interference cancellation;
(f) whether finish in the judgement time interval, if finish, returns step (a) next radio frames is handled, if do not finish, obtains the transmission channel of next son time interval correspondence, returns step (b) the next son time interval is offseted processing.
Further, said method also can have following characteristics: described system is constant beam antenna system, in described step (b)～(e), in a sub-time interval, only need to carry out the processing that offsets in this sub-time interval according to the emission data of first time slot.
Further, said method also can have following characteristics: the Interference Estimation that described step (c) is carried out is meant the estimation to interference power or amplitude, described step (e) also comprises step (d1) before: judge whether interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, if, obtain the transmission channel of next son time interval correspondence, return step (b), otherwise, execution in step (e), and in step (e), only interference power or amplitude are carried out the regeneration of interference signal greater than the transmission channel of described predetermined threshold.
Further, said method also can have following characteristics: described system becomes beam antenna system, in described step (e) afterwards, execution in step (e1): judge whether current sub-time interval finishes, if do not finish, return step (b), the next time slot to this sub-time interval offsets processing again, if finish, execution in step (f) then.
Further, said method also can have following characteristics: the Interference Estimation that described step (c) is carried out is meant the estimation to interference power or amplitude, step (e) also comprises step (d1) before: judge whether interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, if not, execution in step (e), and in step (e), only interference power or amplitude are carried out the regeneration of interference signal greater than the transmission channel of described predetermined threshold; If interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, then execution in step (e1).
Further, said method also can have following characteristics: this method is applied to the TDD system and FDD system colocation site is laid or the occasion of TDD frequency spectrum and FDD frequency spectrum is comprehensively used in the base station of same system, described inter-antenna interference refers to a kind of or combination in any in the following interference: A, with the co-channel interference between the frequency TDD aerial array; B, the adjacent interference frequently between the antenna of working on TDD system antenna and the FDD system uplink frequency spectrum; C comprehensively uses the co-channel interference between the different sectors in the system of TDD frequency spectrum and FDD frequency spectrum; D, antenna that comprehensively uses the employing TDD frequency spectrum that closes in the system of TDD frequency spectrum and FDD frequency spectrum and the interference between antennas that adopts the FDD frequency spectrum.
Further, said method also can have following characteristics: when described step (a) is determined described time interval, at first the radio resource managing unit from network is obtained the transmitting-receiving time slot relation of the system of each antenna or antenna correspondence, the time slot that described receive path is used to receive offsets the time interval of inter-antenna interference as needs, and in this time interval, will produce the identical one or more continuous slots of transmission channel that disturb to this receive path and be divided into a sub-time interval.
Further, said method also can have following characteristics: the described emission data that read in the described step (b) are meant that baseband processing module is sent to all or part of of data of digital to analog converter, and the synchronizing information that is used for channel estimating and interference cancellation, once read the emission data of a time slot when reading or once read the emission data of a sub-time interval.
Further, said method also can have following characteristics: the interference that produces according to each transmission channel of estimating in the described step (d) judges whether to produce to block and is meant: judge that whether interference power that each transmission channel estimates or amplitude are greater than the obstruction thresholding of setting, if have the interference power of a passage or amplitude to be higher than this thresholding, then expression is blocked.
Further, said method also can have following characteristics: the interference signal of each transmission channel regeneration is to obtain by the characteristic of channel of the base band data of transmission channel and this passage is carried out convolution in the described step (e).
In order to solve the problems of the technologies described above, the present invention provides a kind of device that suppresses to disturb between wireless system again, be used for the received signal of receive path is carried out interference cancellation, baseband signal after output offsets, it is characterized in that, comprise interference cancellation control unit, channel estimating unit, interference signal regeneration unit, offset decision unit, offset unit and one or more emission with the interference cancellation interface that is provided with for interference cancellation on the baseband processing module, wherein:
Described interference cancellation control unit is used for from meeting the emission that this receive path produces the one or more transmission channels that disturb being obtained channel estimating and the required emission data of interference cancellation with baseband processing module by the interference cancellation interface according to the mode of operation of channel estimating unit;
Described channel estimating unit is used for according to the described emission data that the interference cancellation control unit obtains the interference signal of corresponding transmission channel being carried out channel estimating, comprises the estimation to interference power or amplitude; And comprise the interference that interference strength and/or different antennae produce the time of advent difference parameter measurement, and the parameter of measuring is used to report;
Described interference signal regeneration unit is used to utilize the characteristic of channel of the described transmission channel interference signal that obtains according to described channel estimating to carry out interference signal regeneration;
The described decision unit that offsets is used for judging whether to block according to the interference power or the amplitude of the transmission channel that estimates, if control offsets the unit and ends to offset, otherwise, allow to offset the unit and offset;
The described unit that offsets deducts the interference resultant signal of regeneration from the total received signal of receive path, finish offseting operation.
Further, said apparatus also can have following characteristics: the described emission data that described interference cancellation control unit obtains are meant that emission is sent to all or part of of data of digital to analog converter with baseband processing module, and the synchronizing information that is used for channel estimating and interference cancellation.
Further, said apparatus also can have following characteristics: described interference signal regeneration unit is by the characteristic of channel of the base band data of transmission channel and this passage being carried out the regeneration interference signal of this passage that convolution obtains.
Further, said apparatus also can have following characteristics: the described decision unit that offsets judges also whether the interference power of the transmission channel that estimates or amplitude have greater than one and sets thresholding, if any, then allow the described unit that offsets to carry out and offset operation, otherwise, do not allow to offset the unit and offset operation.
Further, said apparatus also can have following characteristics: described interference cancellation control unit is before reading of data, at first the radio resource managing unit from network is obtained the transmitting-receiving time slot relation of the system of each antenna or antenna correspondence, the time slot that described receive path is used to receive offsets the time interval of inter-antenna interference as needs, and this time interval is divided into one or more sub-time intervals, during division, may produce the identical one or more continuous slots of transmission channel that disturb to this receive path and be divided into a sub-time interval, in each sub-time interval, the emission that this receive path produces the transmission channel that disturbs is read described emission data with baseband processing module from meeting.
Further, said apparatus also can have following characteristics: described interference cancellation control unit only offsets processing according to the data on first time slot in a sub-time interval, perhaps offset processing respectively according to the data on each time slot in a sub-time interval.
As from the foregoing, the present invention disturbs the antenna isolation technology and the intrasystem interference cancellation technology that enter to combine stoping, and by the data sharing in the system or between system, realizes the interference that enters system is offseted effectively.Apparatus and method of the present invention can effectively suppress the adjacent interference frequently that the TDD system produces the FDD system, can effectively suppress comprehensively to use the TDD frequency spectrum that closes in the system of TDD frequency spectrum and FDD frequency spectrum and the interference between the FDD frequency spectrum, the TDD system that also can suppress to lay, comprehensively use in the system of TDD frequency spectrum and FDD frequency spectrum the co-channel interference between the different sectors with many sectors, site.
Adopt the communication system of apparatus and method of the present invention, coexistence problems when the antenna colocation site that not only can solve different dual-modes is installed, make system's practicability of comprehensive use TDD frequency spectrum and FDD frequency spectrum, and, by the comprehensive use of interference cancellation and other antenna isolation technology, can make under the colocation site situation with disturbing frequently less than disturbing frequently with adjacent with frequency under the installation situation of different location with the neighbour frequently.
Adopt the communication system of apparatus and method of the present invention, not only can suppress the interference introduced between the mobile communication system colocation site antenna, also can be used for the mobile communication base station and offset from the adjacent of received terrestrial digital broadcasting or analog broadcasting transmitter and disturb frequently.
Description of drawings
Fig. 1 is same frequency range, adjacent band interference environment schematic diagram.
Fig. 2 is the structure drawing of device that offsets that the present invention suppresses two inter-system interference.
Fig. 3 is the structure drawing of device that offsets that the present invention suppresses a plurality of inter-system interference.
Fig. 4 is that the present invention suppresses to become the method for disturbing between beamformer system.
Fig. 5 is that the present invention suppresses the method disturbed between the constant wave beam system.
Fig. 6 is that the present invention uses interference cancellation modular structure figure in the base station of TDD and FDD frequency spectrum.
Fig. 7 is a schematic diagram of receiving and dispatching time relationship in example of the present invention between a plurality of antennas.
Embodiment
In the laying of following cell mobile communication systems, it will be more and more general that the antenna colocation site of different wireless systems is laid, the system environments and the interference environment of discussion of the present invention are: a kind of TDD system and FDD system colocation site are laid, perhaps TDD frequency spectrum and FDD frequency spectrum are comprehensively used in the base station of same system, system's colocation site is laid, perhaps TDD frequency spectrum and FDD frequency spectrum are comprehensively used in the base station of same system, and this system layout as shown in Figure 1.
Draw three common-frequency aerial arrays (102a, 102b, 102c) by one group of feeder 116 on the rack 103 of the TDD system among Fig. 1, these three aerial arrays are operated in 1880～1920MHz scope, cover the orientation angles of 120 degree respectively, with zone of form covering of three sectors.Draw three antennas (101a, 101b, 101c) by one group of feeder 117 on the FDD system cabinet 104 among the figure, these three antenna uplinks are operated in 1920～1980MHz scope, in downlink working 2110～2170MHz scope, these three antennas cover the orientation angles of 120 degree respectively, with zone of form covering of three sectors.Further, TDD system cabinet among Fig. 3 103 and FDD system cabinet 104 can comprehensive Design, merge into a system that can comprehensively use TDD frequency spectrum and FDD frequency spectrum, see Fig. 6.
Set at above-mentioned antenna cloth, have the interference of various ways, the present invention only is analyzed as follows the inhibition of potential interference:
1) three same co-channel interferences between the TDD aerial array (102a, 102b, 102c) frequently.
A pair of co-channel interference 113 between aerial array 102a and the aerial array 102b comprises direct coupled component and environment coupled component between antenna during these disturb;
A pair of co-channel interference 115 between aerial array 102a and the aerial array 102c comprises direct coupled component and environment coupled component between antenna during these disturb;
A pair of co-channel interference 114 between aerial array 102b and the aerial array 102c, during disturbing, these comprise direct coupled component and environment coupled component between antenna, a kind of forming process of environment coupled component is: the signal 106 of aerial array 102c emission forms reflected signal 107 and arrives antenna 102b owing to be subjected to object 105 reflections.
2) three TDD aerial array (102a, 102b, 102c) and three adjacent interference frequently between the antenna of working on the FDD system uplink frequency spectrum (101a, 101b, 101c) frequently together.Three antennas of working on FDD system uplink frequency spectrum (101a, 101b, 101c) can be only to do reception, also can receive and dispatch according to the mode of TDD on FDD system uplink frequency spectrum.
Other forms of interference, as, three co-channel interferences between the antenna of working on the FDD system spectrum (101a, 101b, 101c) can be according to solving with three methods that the co-channel interference between the TDD aerial array (102a, 102b, 102c) is identical frequently together of inhibition.
Fig. 2 show two inter-system interference of inhibition of one embodiment of the invention or suppress to adopt TDD and the same system different antennae of FDD frequency spectrum between interference offset apparatus structure, this offset the preceding modulator output of device and the D/A (digital to analog converter) in the transmission antennas transmit passage (by emission with the interference cancellation interface 202 that is provided with for interference cancellation on the baseband processing module) and may with this transmitting antenna between produce the A/D (analog to digital converter) behind the reception antenna receive path of adjacent frequency or co-channel interference output be connected, the transmitting power that is used to offset this transmitting antenna is exported the baseband signal after offseting then to the frequently adjacent or co-channel interference that this reception antenna produces.
As shown in the figure, this interference cancellation device comprises: parameter measurement and interference cancellation control unit 201, the emission with on the baseband processing module for the interference cancellation interface 202 of interference cancellation setting, channel estimating unit 203, interference signal regeneration unit 204, offset decision unit 205 and offset unit 206.
Parameter measurement and interference cancellation control unit 201 are used for determining according to " offset control and measurement and report signal " that the radio resource managing unit in the network is sent the mode of operation of channel estimating unit 203, and mode of operation according to channel estimating unit 203, by interference cancellation interface 202, allow emission provide channel estimating and the needed information of interference cancellation of realizing with baseband processing module, as, baseband processing module is sent to all or part of data 207b of the data 207a of D/A (digital to analog converter), and the synchronizing information 208 that is used for channel estimating and interference cancellation.Parameter measurement is not directly used in interference cancellation, but in order to report corresponding administration module, so that the work of monitoring system, synchronous regime.
The total data of the data 207a that the D/A that channel estimating unit 203 utilizes parameter measurement and interference cancellation control unit 201 to send here is preceding or the total data 207b in the portion of time, carry out channel estimating and (also comprised interference power estimation, time delay estimation, be used for the thresholding comparison and report) and parameter measurement (as, measure interference strength, measure the time of advent poor (TDOA) of the interference of different antennae generation).
Interference signal regeneration unit 204 utilizes the characteristic of channel of the interference signal of channel estimating unit 203 acquisitions to carry out interference signal regeneration.Just the base band data before parameter measurement and interference cancellation control unit 211 output to the D/A of interference signal regeneration unit 204 211 carries out convolution with the characteristic of channel that channel estimating unit 203 obtains, thereby obtains the interference signal of receiving terminal.
Whether offset 205 pairs of decision units offsets and makes judgement, (this thresholding can be an absolute figure with the thresholding ThrD that sets with the interference power (or amplitude) of the transmission channel that estimates, also can be the ratio that receives gross power) compare, just can carry out offseting operation when having only this interference power (or amplitude) greater than thresholding ThrD and less than obstruction thresholding ThrH.
Offset unit 206 and carry out subtraction, the interference resultant signal of regeneration is deducted from total received signal:
r(t)
new＝r(t)-r(t)
generate
In another embodiment of the present invention, as the transmitting power of a plurality of antennas a reception antenna is produced when disturbing, then must with the neighbour frequently, co-channel interference offset D/A before device and these a plurality of antenna transmission channels and the A/D behind this reception antenna receive path links to each other.As shown in Figure 3, the adjacent frequency of present embodiment, co-channel interference offset device and comprise: parameter measurement and interference cancellation control unit 201, a plurality of emissions are with the interference cancellation interface that designs for interference cancellation on the baseband processing module, as interference cancellation interface 202,301,302, channel estimating unit 203, interference signal regeneration unit 204 offsets decision unit 205 and offsets unit 206.
Install the concrete function of each unit for this, will be in the description introduction of following method.
Between the antenna of phase mutual interference, when one in transmitting antenna or the reception antenna or all adopt when becoming beam technique,, will cause the channel variation between transmitting antenna and the reception antenna as using intelligent antenna technology or dynamic electrical tilt antenna technology.
If adopt transmitting-receiving time relationship shown in Figure 7 between the antenna among Fig. 3 212 and 213,307,308: the time slot 0 in the radio frames 701 of antenna 212 is used for emission, time slot 1～7 is used for receiving; Time slot 0～3 in 213 1 radio frames 702 of antenna is used for emission, and time slot 4～7 is used for receiving; Time slot 0～5 in 307 1 radio frames 703 of antenna is used for emission, and time slot 6～7 is used for receiving; Time slot 0 in 308 1 radio frames 704 of antenna is used for emission, 1～7 free time of time slot.In this case, antenna 212 is an antenna 213,307 at time slot 1～3 potential interference source, and antenna 212 is antennas 307 at time slot 4～5 potential interference sources, and antenna 212 does not have potential interference source at time slot 6～7.
When partly or entirely constituting in the antenna 212 and 213,307,308 by smart antenna, think that the wave beam of a time slot internal antenna is constant, the direction of wave beam and width are all changing between each time slot.This just causes all may changing at each time slot to the interference of antenna 212.In addition, the uplink and downlink time slot that radio frames comprises also may change, such as becoming up 4 time slots from up 3 time slots.
To introduce the method that adjacent frequency, co-channel interference offset between change wave beam or the fixed beam antenna below, these two kinds of methods can be applicable to the interference that one or more transmitting antennas cause, promptly the device of Fig. 2 and Fig. 3 can use this two kinds of methods.
The flow process of the method that adjacent frequency, co-channel interference offset between the change beam antenna of one embodiment of the invention as shown in Figure 4, may further comprise the steps:
Concrete grammar is, parameter measurement and interference cancellation the control unit 201 at first radio resource managing unit from network obtain the transmitting-receiving time slot relation of each antenna (the perhaps system of antenna correspondence), such as, the transmitting-receiving time slot that radio resource managing unit from network is obtained each antenna (the perhaps system of antenna correspondence) concerns as shown in Figure 7, under the transmitting-receiving of this each antenna relation, may to need to carry out the time interval Tsection that interference cancellation handles be time slot 1～7 in systems under the antenna 212.Wherein, need carry out the time interval Tsection that interference cancellation handles and further be divided into the experimental process interval: Tsection1～Tsection Ω.
Such as, under transmitting-receiving relation shown in Figure 7, Tsection1 is a time slot 1～3, Tsection2 is a time slot 4～5.May produce the antenna that disturbs to system under the antenna 212 in time slot 1～3 time interval is antenna 213 and antenna 307, and may produce the transmission channel that disturbs to system under the antenna 212 and count N=2 this moment; May produce the antenna that disturbs to system under the antenna 212 in time slot 4～5 time intervals is antenna 307, and may produce the transmission channel that disturbs to system under the antenna 212 and count N=1 this moment; In time slot 6～7 time intervals, there is not possibility that system under the antenna 212 is produced the antenna that disturbs, may produce the transmission channel that disturbs to system under the antenna 212 and count N=0 this moment.
Step 402 is a unit with the time slot in a sub-time interval, from the transmission channel that may produce interference Chi.。。CHn; The baseband processing unit of i+...+n=N} with packet mode read the emission data TDi.。TDn; I+...+n=N}, certainly the present invention is also can the sub-time when reading interval is unit, but will distinguish time slot when handling;
With device shown in Figure 3 is an example, parameter measurement and interference cancellation control unit 201 are finished the processing of above two steps, here no longer repeat, with the example that is treated among the interval Tsection1 of sub-time, according to the transmission data in the time slot is unit, should should from emission data 207a, 303a, read emission data 207b, the 303b of several slots from the emission data during reading of data at every turn.
Step 403 is a unit with the time slot, use emission data TDi.。TDn; I+...+n=N} carries out channel estimating and parameter measurement respectively to each transmission channel, the difference measurements etc. the time of advent that comprises interference power is estimated, time delay is estimated, interference strength is measured, different antennae produces interference, the parameter of measuring is used to report, so that the work of monitoring system, synchronous regime;
Correspondingly, channel estimating unit 203 uses emission data 207b, 303b to carry out channel estimating, and channel estimating is that unit carries out with the time slot, as, all carry out channel estimating and parameter measurement respectively at time slot 1, time slot 2, the time slot 3 of radio frames 701.
Numeration is S (t) according to 207b, total baseband signal that this antenna receives is r (t), search window is long to be Wchips, and the corresponding CDMA standard of W comprises WCDMA, TDSCDMA etc., for other modulation system, as GSM, OFDM, chips among the long W of search window is information symbol duration T s, all is example below with CDMA.
The basic step of channel estimating is that interference signal is carried out relevant search:
One group of interference power estimated value R that related operation obtains in the search window
CorrIn, from the R of maximum
CorrSeveral R are respectively got in both sides
CorrValue is carried out conic fitting, gets the TOA time of advent that matched curve maximum of points time corresponding transmits as antenna 213.When the interference of a plurality of antennas existed, the difference of the TOA of these interference was exactly the difference TDOA time of advent of interference signal.
If the R that related operation obtains
CorrValue (or average) greater than certain thresholding ThrH, just think that the power of the antenna 213 introduced by antenna 212 or antenna 307 is too strong, system is in blocked state, in the case, answer execution in step 409: report blockage information to radio resource managing unit, end to offset processing.
If the R that related operation obtains
CorrValue (or average) all less than certain thresholding ThrL, just think the antenna 213 introduced by antenna 212 and 307 power too a little less than, need not to use interference cancellation, in the case, execution in step 402 is handled the data of next time slot;
If the R that related operation obtains
CorrValue (or average) greater than thresholding ThrL, and less than thresholding ThrH, just think that the power of the antenna 213 introduced by antenna 212 is stronger, need to use interference cancellation, in the case, enter step 406;
Whether offset 205 pairs of decision units offsets and makes a choice the i.e. judgement of execution in step 404 and step 405.
Correspondingly, interference signal regeneration unit 204 utilizes the characteristic of channel of the transmission channel interference signal of channel estimating unit 203 acquisitions, carries out interference signal regeneration.Carry out convolution as the characteristic of channel that obtains with base band data 207b before the D/A and channel estimating unit 203, thereby obtain the interference signal of corresponding transmission channel at receiving terminal.And interference cancellation is finished by offseting unit 206.
Step 407 judges whether the interval Tsection γ of sub-time of the time interval Tsection of interference cancellation finishes, if subinterval Tsection γ does not finish, just returns step 402, and the data of the next time slot in this sub-time interval are handled; If subinterval Tsection γ finishes, carry out next step;
Another embodiment of the present invention provides the method that adjacent frequency, co-channel interference offset between a kind of constant wave beam (or claiming constant wave beam) antenna.
The flow process of the method that adjacent frequency, co-channel interference offset between the constant wave beam antenna comprises the steps: as shown in Figure 5
Step 403 is a unit with the time slot, use emission data TDi.。TDn; I+...+n=N} carries out channel estimating and parameter measurement respectively to each transmission channel;
Above step 401～step 404 and step 409 with become between the beam antenna adjacent frequently, corresponding steps in the method that offsets of co-channel interference is identical, be not described in detail.
Example in the still above method is an example, if the R that related operation obtains
CorrValue (or average) less than certain thresholding ThrL, just think the antenna 213 introduced by antenna 212 power too a little less than, need not to use interference cancellation, in the case, return step 401, the data of the subinterval Tsection γ of next time interval Tsection are handled;
If the R that related operation obtains
CorrValue (or average) greater than thresholding ThrL, and less than thresholding ThrH, just think that the power of the antenna introduced by antenna 212 is stronger, need to use interference cancellation, in the case, enter step 502;
Step 504 is found out the corresponding transmission channel of next son time interval Tsection (γ+1), returns the step 402 pair next one interval Tsection of sub-time (γ+1) and offsets processing.
From top flow process as can be seen, the difference of the method for constant wave beam and change wave beam, when being that constant beamformer system carried out interference cancellation, in a sub-time interval,, needn't resemble and to read each time slot data when being applied to constant beam antenna and offset processing respectively as long as to offset processing according to the data on first time slot just passable.
Fig. 6 is one and has adopted adjacent co-channel interference frequently of the present invention to offset the comprehensive use TDD frequency spectrum of apparatus and method and the mobile communication base station of FDD frequency spectrum.This base station comprises: the antenna 612a that is operated in TDD frequency spectrum (in 1880～1920MHz scope), the signal that transmits and receives of antenna 612a links to each other with receive path 617 with transmission channel 616 by filter 614, and switch 615 switches between transmission channel 616 and receive path 617 realizes the TDD duplex; Be operated in the FDD frequency spectrum (as uply be operated in 1920～1980MHz scope, in downlink working 2110～2170MHz scope) antenna 613a, filter 619 is operated in uplink spectrum 1920～1980MHz scope, filter 620 is operated in downstream spectrum 2110～2170MHz scope, and the signal that antenna 613a receives is delivered to interference cancellation processor 601 through receive path 621 and A/D converter 608; The signal that antenna 612a receives is delivered to interference cancellation processor 601 through passage 617 and A/D converter 607, delivers to after the processing of the signal that signal that antenna 613a receives and antenna 612a receive through interference cancellation processor 601 to receive with baseband processing module 609.Emission is handled with the signal of 602 couples of antenna 612a of baseband processing unit and antenna 613a emission, delivers to transmitting antenna 613a and delivers to transmitting antenna 613a through D/A conversion 623, transmission channel 622 through D/A conversion 618, transmission channel 616 respectively.
The structure of interference cancellation processor 601 and the course of work are identical with the interference cancellation device of Fig. 2 and Fig. 3, can use the metrical information of channel estimating unit acquisition interference signal parameters wherein, comprise: the difference TDOA information time of advent between power level, the different interference, the difference TDOA information time of advent between these different interference can be used for the synchronous adjustment between the different transmitters.
Claims (16)
1, a kind of method that suppresses to disturb between wireless system may further comprise the steps:
(a) determine that the affiliated system of the interior receive path of a radio frames need offset the time interval of inter-antenna interference, and it be divided into one or more sub-time intervals that making can be identical to the transmission channel that this receive path generation is disturbed in each sub-time interval;
(b) in a sub-time interval, the baseband processing unit that produces each transmission channel that disturbs from meeting reads the emission data;
(c) with the time slot be unit, use each the group emission data that reads that each transmission channel is carried out channel estimating respectively, obtain the characteristic of channel of each transmission channel interference signal, and carry out Interference Estimation; And comprise the interference that interference strength and/or different antennae produce the time of advent difference parameter measurement, and the parameter of measuring is used to report;
(d) interference that produces according to each transmission channel of estimating judges whether to produce and blocks, if, end to offset processing, finish, otherwise carry out next step;
(e) utilize the characteristic of channel of each transmission channel interference signal to carry out interference signal regeneration, from the received signal of described receive path, deduct these regeneration interference signals then, carry out interference cancellation;
(f) whether finish in the judgement time interval, if finish, returns step (a) next radio frames is handled, if do not finish, obtains the transmission channel of next son time interval correspondence, returns step (b) the next son time interval is offseted processing.
2, the method for claim 1, it is characterized in that, described system is constant beam antenna system, in described step (b)～(e), only needs to carry out the processing that offsets in this sub-time interval according to the emission data of first time slot in a sub-time interval.
3, method as claimed in claim 2, it is characterized in that, the Interference Estimation that described step (c) is carried out is meant the estimation to interference power or amplitude, described step (e) also comprises step (d1) before: judge whether interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, if, obtain the transmission channel of next son time interval correspondence, return step (b), otherwise, execution in step (e), and in step (e), only interference power or amplitude are carried out the regeneration of interference signal greater than the transmission channel of described predetermined threshold.
4, the method for claim 1, it is characterized in that, described system becomes beam antenna system, in described step (e) afterwards, execution in step (e1): judge whether current sub-time interval finishes, if do not finish, return step (b), next time slot to this sub-time interval offsets processing again, if finish, and execution in step (f) then.
5, method as claimed in claim 4, it is characterized in that, the Interference Estimation that described step (c) is carried out is meant the estimation to interference power or amplitude, step (e) also comprises step (d1) before: judge whether interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, if not, execution in step (e), and in step (e), only interference power or amplitude are carried out the regeneration of interference signal greater than the transmission channel of described predetermined threshold; If interference power or amplitude that each transmission channel produces all are lower than predetermined threshold ThrL, then execution in step (e1).
6, as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that, this method is applied to the TDD system and FDD system colocation site is laid or the occasion of TDD frequency spectrum and FDD frequency spectrum is comprehensively used in the base station of same system, described inter-antenna interference refers to a kind of or combination in any in the following interference: A, with the co-channel interference between the frequency TDD aerial array; B, the adjacent interference frequently between the antenna of working on TDD system antenna and the FDD system uplink frequency spectrum; C comprehensively uses the co-channel interference between the different sectors in the system of TDD frequency spectrum and FDD frequency spectrum; D, antenna that comprehensively uses the employing TDD frequency spectrum that closes in the system of TDD frequency spectrum and FDD frequency spectrum and the interference between antennas that adopts the FDD frequency spectrum.
7, as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that, when described step (a) is determined described time interval, at first the radio resource managing unit from network is obtained the transmitting-receiving time slot relation of the system of each antenna or antenna correspondence, the time slot that described receive path is used to receive offsets the time interval of inter-antenna interference as needs, and in this time interval, will produce the identical one or more continuous slots of transmission channel that disturb to this receive path and be divided into a sub-time interval.
8, as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that, the described emission data that read in the described step (b) are meant that baseband processing module is sent to all or part of of data of digital to analog converter, and the synchronizing information that is used for channel estimating and interference cancellation, once read the emission data of a time slot when reading or once read the emission data of a sub-time interval.
9, as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that, the interference that produces according to each transmission channel of estimating in the described step (d) judges whether to produce to block and is meant: judge that whether interference power that each transmission channel estimates or amplitude are greater than the obstruction thresholding of setting, if have the interference power of a passage or amplitude to be higher than this thresholding, then expression is blocked.
As the described method of arbitrary claim in the claim 1 to 5, it is characterized in that 10, the interference signal of each transmission channel regeneration is to obtain by the characteristic of channel of the base band data of transmission channel and this passage is carried out convolution in the described step (e).
11, a kind of device that suppresses to disturb between wireless system, be used for the received signal of receive path is carried out interference cancellation, baseband signal after output offsets, it is characterized in that, comprise interference cancellation control unit, channel estimating unit, interference signal regeneration unit, offset decision unit, offset unit and one or more emission with the interference cancellation interface that is provided with for interference cancellation on the baseband processing module, wherein:
Described interference cancellation control unit is used for from meeting the emission that this receive path produces the one or more transmission channels that disturb being obtained channel estimating and the required emission data of interference cancellation with baseband processing module by the interference cancellation interface according to the mode of operation of channel estimating unit;
Described channel estimating unit is used for according to the described emission data that the interference cancellation control unit obtains the interference signal of corresponding transmission channel being carried out channel estimating, comprises the estimation to interference power or amplitude; And comprise the interference that interference strength and/or different antennae produce the time of advent difference parameter measurement, and the parameter of measuring is used to report;
Described interference signal regeneration unit is used to utilize the characteristic of channel of the described transmission channel interference signal that obtains according to described channel estimating to carry out interference signal regeneration;
The described decision unit that offsets is used for judging whether to block according to the interference power or the amplitude of the transmission channel that estimates, if control offsets the unit and ends to offset, otherwise, allow to offset the unit and offset;
The described unit that offsets deducts the interference resultant signal of regeneration from the total received signal of receive path, finish offseting operation.
12, device as claimed in claim 11, it is characterized in that, the described emission data that described interference cancellation control unit obtains are meant that emission is sent to all or part of of data of digital to analog converter with baseband processing module, and the synchronizing information that is used for channel estimating and interference cancellation.
13, device as claimed in claim 11 is characterized in that, described interference signal regeneration unit is by the characteristic of channel of the base band data of transmission channel and this passage being carried out the regeneration interference signal of this passage that convolution obtains.
14, device as claimed in claim 11, it is characterized in that, the described decision unit that offsets judges also whether the interference power of the transmission channel that estimates or amplitude have greater than a setting thresholding, if any, then allow the described unit that offsets to carry out and to offset operation, otherwise, do not allow to offset the unit and offset operation.
15, device as claimed in claim 11, it is characterized in that, described interference cancellation control unit is before reading of data, at first the radio resource managing unit from network is obtained the transmitting-receiving time slot relation of the system of each antenna or antenna correspondence, the time slot that described receive path is used to receive offsets the time interval of inter-antenna interference as needs, and this time interval is divided into one or more sub-time intervals, during division, will produce the identical one or more continuous slots of transmission channel that disturb to this receive path and be divided into a sub-time interval, in each sub-time interval, the emission that this receive path produces the transmission channel that disturbs is read described emission data with baseband processing module from meeting.
16, device as claimed in claim 11, it is characterized in that, described interference cancellation control unit only offsets processing according to the data on first time slot in a sub-time interval, perhaps offset processing respectively according to the data on each time slot in a sub-time interval.
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