CN1956342A - Method for removing interference between TDD-CDMA base station and user interference between marginal cell - Google Patents
Method for removing interference between TDD-CDMA base station and user interference between marginal cell Download PDFInfo
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Abstract
This invention relates to a method for eliminating interference of TDD-CDMA system, in which, when different time slots are distributed to base stations, two types of interference exist: interference among base stations, namely, the interference of down-link of one base-station to the up-link of the other, the other is the user interference among local areas at the edge of the areas, namely, the up-link of one base station to the down-link users of another area. The method defines the base station using time slot in up-link to be an expected one and the one using the time slot down-link to be the interference one to decide if it applies emission zero subsidence/receiving zero subsidence at the interference/expected base station and its direction, which can greatly suppress interference among base stations and combines the DCA technology to carry out time slot dispatch to avoid that areas using the zero subsidence technology generates blind regions of communication.
Description
Technical field
The invention belongs to the communications field, relate in particular between the base station in the time-division duplex cell mobile communication systems and the baseband processing method of cell edge inter-cell user interference eliminated.
Background technology
The TDD-CDMA cell mobile communication systems is a kind of interference limiting system, and it is the main source of system interference that inter base station interference (BSI), multiple access disturb (MAI) and intersymbol interference (ISI).For MAI in the sub-district and ISI, generally adopt Multiuser Detection and balancing technique to eliminate, and for BSI, adopt traditional serial and parallel multiuser detection generally can not eliminate fully, because base station interference generally all is strong jamming, is difficult to eliminate, and causes communication to stop up easily.A kind of simple base station interference removing method be exactly avoid base station time slot distribute different or make interference base station the time slot free time need not, but this method will reduce the frequency spectrum service efficiency.
Summary of the invention
Purpose of the present invention is avoided above-mentioned defective exactly, provide a kind of smart antenna zero that utilizes to fall into technology and DCA technology, eliminate the method that time-division duplex (TDD-CDMA) cell mobile communication systems inter base station interference and cell edge inter-cell user are disturbed, thereby reach the raising receptivity, increase the purpose of power system capacity.The present invention is applicable to time-division duplex (TDD-CDMA) cell mobile communication systems.
The basic skills that the present invention adopts: the time slot allocation according to expectation base station and adjacent base station has determined whether adjacent base station interference, while is according to time slot allocation information, the power detection information of the non-adjacent base station of periphery, and default thresholding, determined whether non-adjacent base station interference, determine that according to the number of adjacent base station and non-adjacent interference base station zero falls into scheme, fall into the communication blind district influence that brings in order to eliminate zero simultaneously, and eliminate the cell edge inter-cell user and disturb, must adopt DCA, it is the time slot scheduling, thereby reach the raising receptivity, increase the purpose of power system capacity.Its concrete steps are as follows:
(1) when network operation, the time slot allocation information of base station is known, distributes relevant information to deposit a base station information collection in { among the s} azimuth information and the time slot of adjacent base station and non-adjacent peripheral base station;
(2) travel through all base stations, determine to be in the base station of ascending time slot, these base stations are defined as the expectation base station;
(3), determine and be somebody's turn to do the expectation base station time slot to distribute different adjacent base stations count N to each expectation base station
1Count N with non-adjacent base station
2, these base stations are defined as interference base station;
(4) the training sequence information that receives according to the expectation base station, utilize the scrambling code information of non-adjacent base station to determine the Midamble sign indicating number of non-adjacent base station, the estimation of being correlated with, judge by a threshold value, determine whether non-adjacent base station causes interference to the expectation base station, thereby determine the number N of non-adjacent base station interference
2 1, finally determine the interference base station sum
(5) the training sequence information that receives according to the expectation base station utilizes the scrambling code information of interference base station to determine the Midamble sign indicating number of interference base station, carries out channel estimating, according to the channel impulse response of interference base station, estimates the DOA of interference base station
(6) user is inserted in the expectation base station and carry out channel estimating, obtain the channel impulse response of each desired user;
(7), estimate the DOA of desired user according to expectation base station user's channel impulse response;
(8),, determine zero concrete sunken scheme according to the interference base station number for eliminating inter base station interference;
(9) if the interference base station number (is default threshold value more than or equal to N_threshold, be set at 3, relevant with antenna number, antenna number is few more, and the zero sunken number that can form is few more, for 8 antennas, maximum employing 3 is proper), then interference base station adopts emission zero to fall into technical scheme, makes zero to fall into the quasiexpectation base station, eliminates inter base station interference.Owing to adopt emission zero to fall into technology, so interference base station is communication blind district to expectation base station direction, must be dispatched to other time slots at interference base station to the user who expects the base station direction, and interference base station employing DCA carries out timeslot scheduling.Two kinds of schemes are arranged, the one, interference base station is dispatched to other time slots to all users that expect the base station direction, the angular range shown in Fig. 5 BS3, this scheme is fairly simple, but wastes resource; Another kind of scheme is that the interference base station user in the certain limit is dispatched to other time slots near zero sunken angle, angular range shown in Fig. 5 BS1, and exceeding user outside this angular range according to link budget, if path loss promptly is in the user of cell edge greater than predetermined threshold value, then be dispatched to other time slots, path loss then can be dispatched to current time slots less than threshold value, disturbs to reduce the cell edge inter-cell user.
(10) if, then expecting the base station less than N_threshold, the interference base station number adopt reception zero to fall into technical scheme, and according to the DOA to this community user, make main lobe aim at desired user, zero falls into the aligning interference base station, eliminates between adjacent base station and disturbs, and part is eliminated in the sub-district and disturbed simultaneously.Because the zero sunken technology that receives has been adopted in the expectation base station, the expectation base station is a communication blind district to the interference base station direction, therefore, expectation base station user in the expectation base station to the interference base station direction must be dispatched to other time slots, DCA is adopted in the expectation base station, carry out timeslot scheduling, two kinds of schemes are arranged, the one, at expecting that base station all expectation base station users to the interference base station direction are dispatched to other time slots, another kind of scheme is that the expectation base station user in the certain limit is dispatched to other time slots near zero sunken angle, and fall into user outside the angle certain limit according to link budget exceeding zero, if path loss exceeds the user that predetermined threshold value promptly is in cell edge, then be dispatched to other time slots, and path loss is less than the user of threshold value, then can be dispatched to current time slots, disturb to reduce the cell edge inter-cell user.
First kind of situation: interference base station emission zero falls into technical scheme: if the interference base station number
(threshold value N_threshold=3), as Fig. 5, adjacent base station and non-adjacent base station interference are respectively N
1=6, N
2=12, BS0 is the expectation base station, and BS1-BS17 is an interference base station, actual non-adjacent interference base station number
Need utilize the power estimation approach to determine whether to be strong jamming, actual interference base station
Therefore, interference base station adopts emission zero to fall into technical scheme, and promptly all base station interference sources all adopt emission zero to fall into technology at expectation base station direction, makes interference base station be reduced to 0 to the interference of expectation base station, as shown in Figure 8.And need carry out timeslot scheduling to the user who expects the base station direction to adjacent interference base station BS 1-BS6 and non-adjacent interference base station, two kinds of schemes are arranged
[1] expire all users of butterfly direction of adjacent interference base station BS 1-BS6 and non-adjacent interference base station are dispatched to other time slots, and method is shown in Fig. 5 BS3, and the user in the scope of all θ=60 ° is dispatched to other time slots
[2] the interior user of certain limit was dispatched to other time slots near adjacent interference base station BS 1-BS6 and non-adjacent interference base station fell into angle to zero of expectation base station direction, and judge according to link budget the user who exceeds outside the zero sunken angle certain limit, if path loss promptly is in cell edge greater than threshold value, then be dispatched to other time slots, and path loss is less than threshold value, then can take current time slots, method as shown in Figure 5, the user is dispatched to other time slots in the scope of BS1 θ＜30 °, and whether the user outside this promptly is dispatched to other time slots according to the distance consideration from the base station according to link budget, concrete scope is relevant with number of antennas, for 8 aerial arrays, about range Theta＜30 °, antenna number is many more, and scope is narrow more.
Second kind of situation: the expectation base station receives zero and falls into technical scheme: if the interference base station number
As Fig. 6, N
l=1, BS0 is the expectation base station,
BS1 is an interference base station, expects that then base station BS 0 adopts reception zero to fall into technical scheme, as shown in Figure 3, makes interference base station be reduced to 0 to the interference of expectation base station.And need carry out timeslot scheduling to the user of interference base station direction to expectation base station BS 0, two kinds of schemes are arranged: basic skills is with first kind of situation, be this situation be to receive base station employing timeslot scheduling
Description of drawings
Fig. 1 is a linear array geometry schematic diagram
Fig. 2 is the adjacent two base station interference schematic diagrames of TD-SCDMA
Fig. 3 expects that the base station receives zero and falls into scheme elimination inter base station interference
Fig. 4 time slot burst structure schematic diagram
Fig. 5 adjacent interference number of base stations is 6
Fig. 6 adjacent interference number of base stations is 1
Fig. 7 desired orientation 10 degree, zero falls into direction 30 degree zero falls into figure
Fig. 8 interference base station emission zero falls into scheme and eliminates inter base station interference
The different interference cancellation algorithm performance comparison of Fig. 9
Embodiment
Known, be divided into Frequency Division Duplexing (FDD) (FDD) system and time division duplex (TDD) system according to duplex mode communication.Two kinds of duplex modes respectively have pluses and minuses, and the duplex mode of FDD and TDD all has employing in the 3G (Third Generation) Moblie standard, are specially WCDMA and CDMA2000 and adopt the FDD duplex mode, and TD-SCDMA adopts the TDD duplex mode.The present invention can directly apply to the wireless communication system of TDD-CDMA pattern.The detailed description of technical scheme and purposes all are introduced as an example with TD-SCDMA among the present invention.
Owing to adopted tdd mode, so the processing of uplink downlink all is to be processing unit with the time slot, a time slot is made up of the burst that each inserts the user in the TD-SCDMA system, and the structure of a burst as shown in Figure 4.Comprising that data segment 1 and data segment 2, two segment data sections centre is a training sequence, is the protection interval of 16 chip at last.
Referring to Fig. 3, process chart for the inventive method, for the base station, the scrambler of this sub-district and corresponding basic training sequences and respectively to insert user's channel code known, this sub-district is inserted channel code system that the user distributed and can be notified by high-level signaling.
With two base stations is example, promptly has only an interference base station situation, as Fig. 6, because interference base station is counted N=1＜3, therefore adopt reception zero to fall into technology in the expectation base station, make zero to fall into aligning interference base station direction, as Fig. 3, the interference of interference base station direction is suppressed fully like this, two adjacent base station time slots distribute as shown in Figure 2, if do not adopt interference cancellation techniques, BS2 TS4 time slot will seriously influence the communication quality of BS1 TS4 time slot, cause communication to stop up noiseless as shown in Figure 9 elimination situation.
Fig. 9 is the comparison of receiver performance when having or not interference eliminated, and abscissa among the figure " SNR " is the signal chip power of desired user and the ratio of background noise, and ordinate " Raw BER " is the bit error rate when not adding coding and decoding in the emulation platform.The condition of emulation is: the even linear array in 8 antenna a period of time, distance is a half-wavelength between a period of time, as shown in Figure 1.Have only one to insert user's (desired user) in the expectation sub-district, this user is 10 ° to expectation base station direction, an adjacent base station interference is arranged, and interference base station is 30 ° to expectation base station direction, and the power of interference base station arrival expectation base station is 9 times that desired user arrives the expectation base station power.The spreading factor of desired user and interference user all is 16.
As shown in Figure 9, under the rayleigh fading channel environment, because the strong jamming of adjacent base station, expectation sub-district received signal quality is very poor, therefore, must carry out interference eliminated, to improve receiver performance.As can be seen from Figure 9, adopt zero sunken technology to carry out interference eliminated, performance is much better than the parallel interference elimination algorithm.Because use zero sunken technology can eliminate adjacent base station interference fully basically, its performance approaches the receiver performance under the complete noiseless situation.For timeslot scheduling two kinds of schemes are arranged:
[1] is in zero for the expectation base station and falls into (15 of direction, 15) user in the degree scope must be dispatched to other time slots, otherwise after adopting zero to fall into technology, subscriber signal in this scope will be very faint, and the user outside this scope determines whether strong jamming is caused in adjacent sub-district according to link budget, judges whether to be dispatched to other time slots;
[2] be in zero user who falls in direction (30,30) the degree scope for the expectation base station and all be dispatched to other time slots, simplify the timeslot scheduling complexity on the one hand, can reduce presence of intercell interference to a greater degree simultaneously.
For many base station interference situation, as shown in Figure 5, method and top similar, what just at this moment adopt is that emission zero falls into the timeslot scheduling technology of technical scheme and interference base station, interference base station forms zero in expectation base station direction and falls into as Fig. 8 according to expectation base station direction, and different is, expectation base station BS 0 need be launched zero falling into thereby be convenient to interference base station with the interference radiating way notice interference base station of interference base station.Because performance has the different of essence with reception zero subsidence, therefore, do not carry out emulation to launching zero falling into.
In sum, by have or not interference eliminated more as can be known, adopt smart antenna zero to fall into technology and DCA technology, inter base station interference is eliminated and cell edge inter-cell user interference eliminated combines and can significantly improve receptivity, thereby the increase power system capacity.
Claims (5)
1. eliminate at time-division duplex TDD-CDMA inter base station interference and the method for the inter-cell user interference eliminated of cell edge for one kind:
(1) according to time slot allocation information, travel through all base stations, determine to be in the base station of ascending time slot, these base stations are defined as the expectation base station;
(2), determine and be somebody's turn to do the expectation base station time slot to distribute different adjacent base stations count N to each expectation base station
1Count N with non-adjacent base station
2, these base stations are defined as interference base station;
(3) for non-adjacent interference base station, need further utilize power estimated information and predetermined threshold value, determining whether that strong jamming is caused in the expectation base station, and determine that non-adjacent strong jamming base station counts N
2 1
(4) for eliminating inter base station interference, adopt zero to fall into technology and timeslot scheduling technology, according to the number of adjacent base station and non-adjacent interference base station
Determine that zero falls into scheme, adopt DCA, carry out timeslot scheduling, disturb in order to eliminate the cell edge inter-cell user simultaneously, must adopt DCA, carry out timeslot scheduling having used zero sub-district that falls into technology;
(5) when the base station time slot assignment information changes, need to upgrade again the information of expectation base station and interference base station, otherwise do not need to upgrade.
2, according to claim 1ly eliminate and the method for the inter-cell user interference eliminated of cell edge at time-division duplex TDD-CDMA inter base station interference, it is characterized in that: if the interference base station number is more than or equal to N_threshold, then interference base station adopts emission zero to fall into technical scheme, make zero to fall into, eliminate inter base station interference the quasiexpectation base station; Have communication blind district because zero falls into direction, therefore, must be dispatched to other time slots at interference base station to the user who expects the base station direction, interference base station must adopt DCA, carries out timeslot scheduling; The one, interference base station is dispatched to other time slots to all users that expect the base station direction; The 2nd, near the interference base station user zero sunken angle in the certain limit is dispatched to other time slots, judge according to link budget the user who exceeds outside the angular range, if path loss promptly is in the user of cell edge greater than predetermined threshold value, then be dispatched to other time slots, and path loss is less than threshold value, then can be dispatched to current time slots, disturb to reduce the cell edge inter-cell user.
3, according to claim 1ly eliminate and the method for the inter-cell user interference eliminated of cell edge at time-division duplex TDD-CDMA inter base station interference, it is characterized in that: if the interference base station number is less than N_threshold, expect that then the base station employing receives zero and falls into technical scheme, and according to direction of arrival DOA (Direction-Of-Arrival) to this community user, make main lobe aim at desired user, zero falls into the aligning interference base station, eliminate between adjacent base station and disturb, part is eliminated in the sub-district and is disturbed simultaneously; Owing to adopt zero to fall into the communication blind district influence that technology causes, the expectation base station must be dispatched to other time slots to the expectation base station user of interference base station direction in order to eliminate, and DCA must be adopted in the expectation base station, carries out timeslot scheduling; The one, be dispatched to other time slots to expecting the base station to all users of interference base station direction; The 2nd, near the expectation base station user zero sunken angle in the certain limit is dispatched to other time slots, and exceeding user outside this angular range according to link budget, if path loss promptly is in the user of cell edge greater than predetermined threshold value, then be dispatched to other time slots, and path loss is less than threshold value, then can be dispatched to current time slots, disturb to reduce the cell edge inter-cell user.
4, according to claim 1ly eliminate and the method for the inter-cell user interference eliminated of cell edge at time-division duplex TDD-CDMA inter base station interference, it is characterized in that: adjacent base station interference is to determine by the prior information of time slot allocation, and determines interference radiating way DOA by channel estimating; For non-adjacent base station interference, need determine according to prior information, power estimated information and the predefined threshold value of time slot allocation.
5, according to claim 1ly eliminate and the method for the inter-cell user interference eliminated of cell edge at time-division duplex TDD-CDMA inter base station interference, it is characterized in that: need adopt corresponding zero to fall into technical scheme and DCA scheme according to the relation of the interference base station number and the predetermined threshold value N_threshold of reality.
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