CN100592651C - Method and device for soft handoff with interference cancellation in a wireless frequency hopping communication system - Google Patents

Method and device for soft handoff with interference cancellation in a wireless frequency hopping communication system Download PDF

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CN100592651C
CN100592651C CN200480012768A CN200480012768A CN100592651C CN 100592651 C CN100592651 C CN 100592651C CN 200480012768 A CN200480012768 A CN 200480012768A CN 200480012768 A CN200480012768 A CN 200480012768A CN 100592651 C CN100592651 C CN 100592651C
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base station
frequency hopping
terminal
sequence
data
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CN1871784A (en
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阿夫尼什·阿格拉瓦
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Qualcomm Inc
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Abstract

Techniques are provided to support soft handoff in a frequency hopping OFDMA system. Each sector concurrently supports 'non-handoff' users and 'soft-handoff' users. A non-handoff user communicates with only one sector, and a soft-handoff user communicates with multiple sectors simultaneously. Non-handoff users are assigned traffic channels by their sole sectors, and soft-handoff users are assignedtraffic channels by their 'serving' sectors. For each sector, the traffic channels assigned to the non-handoff users are orthogonal to one another and may or may not be orthogonal to the traffic channels assigned to the soft-handoff users. Each sector processes its received signal and recovers the data transmissions from the non-handoff users of that sector. Each sector then estimates the interference due to the non-handoff users and cancels the interference from the received signal. Each sector further processes its interference-canceled signal to recover the data transmissions from the soft-handoff users.

Description

Support the method and apparatus of soft handover in the wireless frequency hopping communication system with interference eliminated
The cross reference of related application
The application relates to the following application that is all transferred present assignee:
Submitted on May 12nd, 2003, be entitled as " Soft Handoff with InterferenceCancellation in a Wireless Frequency Hopping Communication System ", co-pending U. S. application No.06/470160.
Invention field
The present invention relates to communication, relate in particular to and in wireless frequency hopping communication system, utilize interference eliminated to support the technology of soft handover.
Technical background
In frequency-hopping communication system, data are transmitted on different sub-bands in the different time interval, and this time interval is called as " hop period ".OFDM (OFDM), other multi-carrier modulation technologies or some other conceptions can provide these sub-bands.By frequency hopping, transfer of data is jumped at intersubband in pseudorandom mode.This jump provides frequency diversity, and makes transfer of data can keep out harmful path effects better, as narrow band interference, artificial disturbance, decline etc.
OFDM (OFDMA) system uses OFDM, can support a plurality of users simultaneously.For frequency-hopped ofdm A system, can with " business " channel that a concrete frequency hopping (FH) sequence is associated on send specific user's transfer of data.This FH sequence table is shown in a concrete subband that is used for transfer of data in each hop period.With a plurality of Traffic Channels that different FH sequences are associated on, can send a plurality of transfer of data of a plurality of users simultaneously.These FH sequence definitions can be become mutually orthogonal, thereby, therefore have only a Traffic Channel, have only a transfer of data to use each subband in each hop period.By using quadrature FH sequence, a plurality of transfer of data can not disturbed each other, enjoy the benefit of frequency diversity simultaneously.
Can be with the OFDMA system deployment for having a plurality of sub-districts, wherein, the sub-district is often referred to the overlay area of base station.Transfer of data in sub-district on the particular sub-band is exactly to disturb the transfer of data of another on the same sub-band in neighbor cell.In order to make the presence of intercell interference randomization, it is pseudorandom that common FH sequence definition with each sub-district becomes the FH sequence with respect to neighbor cell.By using the pseudorandom FH sequence of different districts, realize interference diversity, and a user's data transmission in sub-district observes the average interference of transmitting from other user's data in other sub-districts.
In the multi-cell OFDMA system, support that " soft handover " is extraordinary.In soft switching process, the user uses a plurality of base stations to communicate simultaneously.Soft handover can provide space diversity, with prevent via to or from harmful path effects of the transfer of data of a plurality of base stations of diverse location.But when system adopted frequency hopping, soft handover was very complicated.This is because in order to make the presence of intercell interference randomization, the FH sequence of a sub-district is pseudorandom (being non-orthogonal) with respect to the FH sequence of neighbor cell.Specific base in a plurality of base stations can indicate the user who uses a plurality of base stations to carry out soft handover to use the FH sequence.The transfer of data quadrature that other users of the transfer of data that this soft handover user sends and this specific base send, but be pseudorandom with respect to the transfer of data of user's transmission of other base stations.This soft handover user will cause interference to the user of other base stations, and therefore also will receive the interference from these users.All are subjected to the performance of interference user to disturb reduction, unless in some way with its reduction.
Therefore, need to support the technology of the soft handover in the frequency-hopped ofdm A system in this area.
Summary of the invention
Here the soft handover in the technical support wireless communication system that provides (for example, frequency-hopped ofdm A system).In the system each can be distinguished into one or more sectors for a short time.Each sector in the system can be supported one group of " do not have and switch " user and one group of " soft handover " user simultaneously.Not having the user of switching only uses a sector to communicate the user of (that is, not being in soft changing state).The soft handover user is the user who uses a plurality of sectors to communicate simultaneously.
For each sector, user's distribution service channel is switched to each nothing of this sector in this sector, and each soft handover user " service " or " host " sector are the soft handover user distribution service channel of this sector.Soft handover user's serving sector is that the soft handover user communicates the designated sector in used a plurality of sectors.For each sector, it is mutually orthogonal that the nothing of distributing to this sector is switched user's Traffic Channel, and can or can be not and the soft handover user's who distributes to this sector Traffic Channel quadrature, and this depends on that this sector is these soft handovers user's a serving sector.
For each sector, can switch the user to the nothing of this sector and carry out power control, thereby when existing from the soft handover user's of this sector interference and having interference from the user of other sectors, this sector can receive their transfer of data and it is decoded.Also can carry out power control, thereby can decode in their sector, reduce the interference of switching the user to not having simultaneously to their transfer of data to the soft handover user.
Its received signal of each sectors process, and recover to switch the user's data transmission from the nothing of this sector.Will be from after do not have switching user's data transmission decoding, each sector be estimated to switch the interference that the user causes by the nothing of this sector, and from it is eliminated from received signal.Each sector also handle it elimination interference signals, thereby recover soft handover user's data transmission from this sector.
Describe various aspects of the present invention and embodiment below in detail.
The accompanying drawing summary
By the detailed description below in conjunction with accompanying drawing, it is more apparent that feature of the present invention, essence and advantage will become, and in these accompanying drawings, identical mark is represented corresponding or identical parts or step, wherein:
Fig. 1 shows a kind of OFDMA system;
Fig. 2 shows the frequency hopping of a sector in the OFDMA system;
Fig. 3 is the block diagram of terminal;
Fig. 4 A is the block diagram of the base station in the synchro system;
Fig. 4 B is the block diagram of the base station in the asynchronous system;
Fig. 5 is the block diagram of reception (RX) data processor in the base station in the synchro system;
Fig. 6 is the interior interference estimator of RX data processor and the block diagram of interference eliminator;
Fig. 7 is the block diagram of the ofdm demodulator/RX data processor in the base station in the asynchronous system;
Fig. 8 is the interior interference estimator of ofdm demodulator/RX data processor and the block diagram of interference eliminator;
Fig. 9 is the flow chart that terminal sends data; And
Figure 10 is that the base station receives the flow chart from the transfer of data of a plurality of terminals.
Embodiment
" exemplary " used herein speech means " as example, illustration or explanation ".Here being described to any embodiment of " exemplary " or design should not be interpreted as than other embodiment or design more preferably or have superiority.
Fig. 1 shows a kind of exemplary OFDMA system 100 that supports a plurality of users.A plurality of base stations 110 that communicate with a plurality of terminals 120 that provide are provided in system 100.The base station is to be used for the fixed station that communicates with terminal, also can be called as access point, Node B or other terms.Terminal 120 is dispersed in the system usually, and each terminal can be that fix or mobile.Also terminal can be called mobile radio station, subscriber equipment (UE), radio communication device or other terms.
At any given time, each terminal can be by forward link and a plurality of base station communication and/or by reverse link and a plurality of base station communication.This depend on that whether this terminal activates, whether support whether soft handover and this terminal are in soft changing state.Forward link (being down link) refers to the communication link from the base station to the terminal, and reverse link (being up link) refers to the communication link from terminal to base station.In Fig. 1, terminal 120c is on reverse link and uses base station 110a, 110b and 110c to carry out the state of soft handover, terminal 120d is in and uses base station 110a and 110c to carry out the state of soft handover, and terminal 120g is in and uses base station 110b and 110c to carry out the state of soft handover.Remaining terminal is not in soft changing state.For the sake of simplicity, Fig. 1 does not show forward link transmissions.
System controller 130 is connected to base station 110, can carry out multiple function, as: coordinate and control base station 110 (1); (2) between these base stations, data are sought the footpath; And (3) are by the access and the control of the terminal of these base station services.
Each base station 110 provides the coverage of a corresponding geographic area 102.Term " sub-district (cell) " can refer to base station and/or its overlay area, and this depends on the context that uses this term.For the increase capacity, the overlay area of each base station can be divided into a plurality of sectors (for example, three sector 104a, 104b and 104c).Each sector provides service by relevant base station transceiver subsystem (BTS).Term " sector " can refer to BTS and/its overlay area, this depends on the context that uses this term.For a sub-district of carrying out subregion, the base station of this sub-district generally includes the BTS of all sectors of this sub-district.Following description hypothesis is distinguished into a plurality of sectors for a short time with each.For the sake of simplicity, in the following description, term " base station " is logical to refer to the fixed station of serving for the fixed station of sub-district service with for the sector.The base station of all sectors of same sub-district is often implemented in the physical base station of this sub-district.
Technology described herein can be used for supporting soft handover, and in soft handover, terminal uses a plurality of sub-districts to communicate simultaneously.The base station of these sub-districts is included in the Active Set (activeset) of this terminal.These technology can be used for also supporting " More Soft Handoff (softer handoff) " that in the More Soft Handoff process, a terminal uses a plurality of sectors of same sub-district to communicate simultaneously.The base station of these sectors (normally a plurality of parts of same physical base station) is included in the Active Set of this terminal.For the sake of simplicity, in the following description, term " soft handover " is often referred to the situation that a plurality of sectors that terminal uses situation that a plurality of sub-districts communicate and terminal to use same sub-district simultaneously simultaneously communicate.
Technology described herein can be used for synchro system, and in synchro system, the time of a plurality of base stations is synchronized to common clock source (for example GPS) in the system.These technology also can be used for asynchronous system, and in asynchronous system, the time of a plurality of base stations is nonsynchronous in the system.For the purpose of clear, suppose that the main user (will define below) of each sector and the base station of this sector are synchronous.
OFDMA system 100 utilizes OFD M modulation technique, and whole system bandwidth efficient ground is divided into the sub-band of a plurality of (N) quadrature, N＞1 wherein, and 2 power normally.These subbands also often are called as audio frequency (tone), subcarrier, section (bin) and frequency subchannels.Adopt OFDM, each subband is associated with the respective sub that a data available is modulated.In some ofdm systems, has only N DIndividual subband is used for transfer of data, N PIndividual subband is used for pilot transmission, N GIndividual subband is usefulness not, as guard subbands, so that system satisfies spectrum mask (spectral mask) requirement, wherein, N=N D+ N P+ N GFor the sake of simplicity, following description supposes that all N subband all can be used for transfer of data.
Fig. 2 shows the frequency hopping of a sector in the OFDMA system.As mentioned above, use frequency hopping can obtain various benefits, comprise the frequency diversity and the interference randomization of keeping out harmful path effects.In this example, N=8 is for the numbering of these 8 allocation of subbands is 1 to 8.Can define 8 Traffic Channels at most, wherein, each channel one of uses in each hop period in these 8 subbands.The definable hop period equals the duration of one or more OFDM symbols.
The FH sequence that each Traffic Channel is different with one is associated.Can be based on the FH function f s(k T), generates the FH sequence of all Traffic Channels in the sector, and wherein k represents Traffic Channel numbering or identifier (ID), and T represents system time, and its unit is a hop period.Use the FH function f s(k, the T) N in a different value of K can generate N different FH sequence.The FH sequence table of each Traffic Channel is shown in a concrete subband that is used for this Traffic Channel in each hop period.
Fig. 2 shows the subband that is used for two Traffic Channels 1 and 4.The FH sequence and the subband of Traffic Channel 1 are represented with the black square, and the FH sequence of Traffic Channel 4 and subband are represented with the oblique line grid.As can be seen from Figure 2, the pseudo-random fashion of each Traffic Channel to be determined by its FH sequence dynamically jumps between subband.In this example, the FH sequence f of Traffic Channel 4 s(4, T) be the FH sequence f of Traffic Channel 1 s(1, vertical moving variant T).The used subband of the used subband of Traffic Channel 4 and Traffic Channel 1 is relevant, as follows: f s(4, T)=(f s(1, T)+3) mod N.
Disturb in the sector, the quadrature FH sequence of its Traffic Channel can be used in each sector.If any two FH sequences are not used identical subband in any hop period T, then the FH sequence is mutually orthogonal.As shown in Figure 2, become mutual vertical moving variant, can obtain this quadrature situation by FH sequence definition with each sector.So the Traffic Channel of each sector is mutually orthogonal, because they are relevant with the FH sequence of quadrature.Because each subband can only be used by a Traffic Channel in each hop period, so, the interference between a plurality of transfer of data of having avoided sending on a plurality of Traffic Channels in the common sector.
For many sectors OFDMA system, the user's data transmission in sector can be disturbed the user's data transmission in other sectors.In order to make the inter-sector interference randomization, can use different pseudorandom FH functions for different sectors.For example, can be with sector s 1The FH function
Figure C20048001276800151
Be defined as with respect to sector s 2The FH function Be pseudorandom.In this case, sector s 1The FH sequence that is used for Traffic Channel k will be pseudorandom with respect to the FH sequence that sector 2 is used for Traffic Channel m, and wherein, k can equal or be not equal to m.In when, between the FH of these Traffic Channels sequence " conflict " taking place when, that is, when f s 1 ( k , T ) = f s 2 ( m , T ) And when Traffic Channel k uses identical subband with m in identical hop period, produce between Traffic Channel k and the m and disturb.But, because the FH function
Figure C20048001276800154
With
Figure C20048001276800155
Pseudo-random nature, interference will be randomized.
Therefore, the FH sequence definition of each sector can be become:
1, mutually orthogonal, disturb in the sector avoiding; And
2, the FH sequence with respect to adjacent sectors is pseudorandom, to avoid inter-sector interference.
By above constraint, distributed the user of Traffic Channel k to be orthogonal to the every other user who has distributed other Traffic Channels by this sector by a sector.But, use all users of different FH functions non-orthogonal in this user and the adjacent sectors.
Return among Fig. 1, each sector supports one group not have the user of switching and one group of soft handover user simultaneously.Each user can communicate with one or more sectors, and this depends on whether this user is in soft changing state.The user communicates used sector simultaneously and is included in " Active Set ".For there not being the user of switching, Active Set comprises single sector, i.e. this user's serving sector.For the soft handover user, Active Set comprises a plurality of sectors, and the sector (for example the strongest reception sector) in these sectors is designated as this soft handover user's serving sector.
Each sector is switched the user for the nothing of this sector and is distributed the Traffic Channel with quadrature FH sequence, and therefore, these users do not disturb mutually.Each soft handover user's serving sector distributes a Traffic Channel for this user.Therefore other user's quadratures in each soft handover user and its serving sector do not disturb mutually.But other users in other sectors in each soft handover user and its Active Set are non-orthogonal.Therefore, the soft handover user of each sector can or can not disturb the nothing of this sector to switch the user.This depends on whether this sector or other sectors are that these soft handovers user has distributed Traffic Channel.
For each sector, can switch the user to the nothing of this sector and carry out power control, thereby if exist from the soft handover user's of this sector interference and from the user's of other sectors interference, can decode to their transfer of data in this sector.Also can carry out power control to the soft handover user, thus the sector in their Active Sets can decode to their transfer of data, reduce the interference of switching the user simultaneously to not having.
In one embodiment, its received signal of each sectors process, and recover to switch the user's data transmission from the nothing of this sector.Then, each sector is estimated not switch the interference that the user causes by having, and it is eliminated from received signal.Each sector further handle it elimination interference signals, to recover soft handover user's data transmission from this sector.
Also each sector can be considered as support simultaneously one group of " master " user and one group of " inferior " user.For each sector, main user is the user by this sector distribution service channel, and inferior user is the user by any other sector distribution service channel.The main user of each sector comprises: the nothing of (1) this sector is switched the user; And (2) serving sector is the soft handover user of this sector.The inferior user of each sector comprises that serving sector is the soft handover user of other sectors outside this sector.
In another embodiment, its received signal of each sectors process, and recover the transfer of data of the main user (nothing that comprises this sector switch the user and by the soft handover user of this sector distribution service channel) from this sector.Then, the interference that each sector estimation is caused by these main users, and from received signal, eliminate this interference.Each sector further handle it elimination interference signals, to recover transfer of data from the inferior user (by other sector distribution service channels) of this sector.
Also can recover from the user's data transmission by other modes except that above-mentioned two embodiment each sector, and this falls within protection scope of the present invention equally.Usually, it is desirable eliminating interference as much as possible.But, eliminates the interference capability that causes by the specific user and depend on the ability that is correctly decoded from this user's data transmission, and this depends on other factors, as the user being carried out the mode of power control.
Fig. 3 shows the block diagram of the embodiment of terminal 120x, and terminal 120x is a terminal in the OFDMA system 100.Terminal 120x can be used for not having the user of switching or soft handover user.For the sake of simplicity, Fig. 3 only shows the transmitter section of terminal 120x.
In terminal 120x, encoder/modulator 314 receptions are from the business datum of data source 312 and control data and other data of coming self-controller 330.Business datum is specified in Traffic Channel x and goes up transmission, and the serving sector of this terminal 120x has been given terminal 120x with this channel allocation.Encoder/modulator 314 will receive data and format, encodes, interweaves and modulate, and modulation symbol (or be simply referred to as " data symbol ") is provided.Each modulation symbol be with the used corresponding ensemble of modulating mode (signal constellation) of this modulation symbol in a specific complex values.
Emission frequency hopping (TX FH) switch 316 receives data symbol, and provides these symbols on the suitable subband of Traffic Channel x.Traffic Channel x is associated with FH sequence x, and FH sequence x is illustrated in the concrete subband that is used for Traffic Channel x among each hop period T.Controller 330 can be based on the FH function f of serving sector s(k T), generates FH sequence x.TX FH switch 316 can also provide frequency pilot sign on pilot subbands, and further provides signal values of zero for each subband that is not used in pilot tone or transfer of data.For each OFDM symbol period, TXFH switch 316 provides N " emission " symbol (comprising data symbol, frequency pilot sign and signal values of zero) of N subband.
OFDM modulator 318 receives N transmission symbol of each OFDM symbol period, and corresponding OFDM symbol is provided.OFDM modulator 318 generally includes inverse fast fourier transform (IFFT) unit and Cyclic Prefix maker.For each OFDM symbol period, the IFFT unit uses N point Fourier inverse transformation, and this N emission sign reversing to time domain, comprised " after the conversion " symbol of N time domain " chip " with acquisition.Each chip all is the complex values of transmitting in a chip period.Then, the Cyclic Prefix maker repeats the part of symbol after each conversion, comprises N+C with formation pThe OFDM symbol of individual chip, wherein C pIt is the number of chips that is repeated.Repeating part is commonly called Cyclic Prefix, and is used to resist the intersymbol interference (ISI) that is caused by frequency selective fading.The OFDM symbol period is N+C corresponding to the duration of an OFDM symbol pIndividual chip period.OFDM modulator 318 provides OFDM symbols streams.
Transmitter unit (TMTR) 320 receives and handles the OFDM symbols streams, to obtain modulation signal.Transmitter unit 320 can further be adjusted the amplitude of OFDM symbol and/or modulation signal based on the power control signal of slave controller 330 receptions.Modulation signal is sent to base station the Active Set of terminal 120x from antenna 322.
Fig. 4 A is the block diagram of the embodiment of the base station 110x in the synchronous OFDMA system.Base station 110x is sector s xFixed station.For the sake of simplicity, Fig. 4 only shows the receiver section of base station 110x.
Antenna 412 receives the modulation signal that is sent by the terminal in the 110x coverage of base station.Received signal from antenna 412 can comprise: (1) is from sector s xNothing switch one or more modulation signals of user; And (2) are from sector s xOne or more modulation signals of soft handover user.Received signal is offered receiver unit (RCVR) 414 and handle, to obtain sampling by receiver unit (RCVR) 414.Then, ofdm demodulator 416 is handled sampling, and " receptions " symbol, " receptions " symbol are provided is by base station 110x reception, by the Noise Estimation of the combined transmit symbol of all terminals transmissions.Ofdm demodulator 416 generally includes cyclic prefix removal unit and FFT unit.For each OFDM symbol period, cyclic prefix removal unit is removed the Cyclic Prefix in each reception OFDM symbol, to obtain the receiving conversion symbol.Then, the FFT unit arrives frequency domain with each receiving conversion sign reversing, to obtain N receiving symbol of this N subband with N point FFT.
RX data processor 420 obtains N receiving symbol of each OFDM symbol period, and handles these symbols, to obtain the decoded data of each terminal to base station 110x emission.Describe the processing of RX data processor 420 below in detail.The decoded data of each terminal is offered data sink 422, store.
The operation at controller 330 and 430 difference control terminal 120x and base station 110x place.Memory cell 332 and 432 is respectively controller 330 and 430 program code and the data of using provide storage.
Fig. 4 B shows the block diagram of the embodiment of the base station 110y in the asynchronous OFDMA system.For asynchronous system, inferior user's time can be different with main user's time.Ofdm demodulator/RX data processor 440 is carried out the OFDM demodulation based on user's time to each user.Ofdm demodulator/RX data processor 440 is also carried out interference eliminated to time-domain symbol, and is as described below.
Among the embodiment that is described below, sector s xMain user be by sector s xThe user of distribution service channel, and sector s xInferior user be by removing sector s xOutside the user of other sector distribution service channels.Sector s xMain user can be sector s xNothing switch user or sector s xMiddle serving sector is sector s xThe soft handover user.Sector s xInferior user be sector s xMiddle serving sector is to remove sector s xOutside the soft handover user of other sectors.
Fig. 5 shows the block diagram of an embodiment of the RX data processor in the base station 110x shown in Fig. 4 A in the synchronous OFDMA system.In this embodiment, RX data processor 420 comprises P main user's P data processor 510a to 510p, interference estimator 520, interference eliminator 530 and S time user's S data processor 540a to 540s, wherein P 〉=1 and S 〉=1.
For each OFDM symbol period, ofdm demodulator 416 offers data processor 510a to 510p and interference eliminator 530 with N receiving symbol of this N subband.Distribute a data processor 510, to recover from each main user's data transmission.The processing of data processor 510a to next autonomous user's 1 transfer of data is described below.Traffic Channel pl is assigned to main user 1, and Traffic Channel pl is associated with FH sequence pl.
In data processor 510a, RX FH switch 514a receives N receiving symbol of N subband in each OFDM symbol period.RX FH switch 514a offers demodulator/decoder 516a with the reception data symbol of Traffic Channel p1, and main user's 1 reception frequency pilot sign is offered channel estimator 518a.Because Traffic Channel pl dynamic jump between subband is so the TX FH switch 316 of the end of RX FH switch 514a and main user pl is as one man worked, to extract the reception data symbol from the suitable subband of Traffic Channel.The FH sequence that offers RX FH switch 514a is identical with the FH sequence of the TX FH switch 316 that offers main user's 1 end.In addition, these FH sequences are synchronous.
Channel estimator 518a is from RX FH switch 514a (as shown in Figure 5) or obtain main user's 1 reception frequency pilot sign from receiving symbol.Then, channel estimator 518a obtains main user's 1 channel estimating based on receiving frequency pilot sign.This channel estimating can comprise following estimation: (1) main user's 1 terminal and be used for channel gain between the base station 110x of each subband of transfer of data; (2) signal strength signal intensity of the pilot tone that receives from main user 1; And (3) other measured values.
Demodulator/decoder 516a can be used for the channel estimating of self-channel estimator 518a, and the reception data symbol from RX FH switch 514a is carried out coherent demodulation, estimates with the data symbol that obtains main user 1.Demodulator/decoder 516a further estimates to carry out demodulation (promptly removing sign map), removes and interweave and decode this data symbol, to obtain main user's 1 decoding business datum.Usually, the performed processing and the interior performed processing complementation of corresponding units of this main user's terminal in the unit in main user's 1 the base station 110x.
Data processor 510a to 510p provides main user's 1 to P decoding business datum and channel estimating respectively.Interference estimator 520 receives main users' 1 to P decoding business datum and channel estimating, estimates the interference that caused by each user among this P the main user, and this P main user's Interference Estimation is offered interference eliminator 530.Interference eliminator 530 receives N receiving symbol of N subband and this P main user's Interference Estimation in each OFDM symbol period.For each OFDM symbol period, interference eliminator 530 is determined the total interference that is caused by this P main user on this N subband, deducts this total interference from the receiving symbol of each subband, and the individual symbol of having eliminated interference of N of this N subband is provided.Interference estimator 520 and interference eliminator 530 are described below.
Distribute a data processor 540, to recover from the transmission of each time user's data.Each data processor 540 comprises: RX FH switch 544, demodulator/decoder 546 and channel estimator 548, their working method are similar to RX FH switch 514, demodulator/decoder 516 and the channel estimator 518 in the data processor 510 respectively.But the RX FH switch 544 in each data processor 540 provides N to eliminate the symbol that disturbs, rather than the N of a N subband receiving symbol.In addition, the RX FH switch 544 in each data processor 540 is worked with the TX FH switch at the inferior user terminal place of being recovered by this data processor harmoniously.Data processor 540a to 540s provides time user's 1 to S deciphering business datum (and channel estimating) respectively.
Fig. 6 is the block diagram of an embodiment of the interference estimator 520 in the RX data processor shown in Fig. 4 A 420 and interference eliminator 530 in the synchronous OFDMA system.In this embodiment, interference estimator 520 comprises P every terminal interference estimator 620a to 620p for P main user.Distribute every terminal interference estimator 620, with the interference of estimating to cause by each main user.The processing that every terminal interference estimator 620a carries out is described below, with the interference of estimating to cause by main user 1.
In every terminal interference estimator 620a, encoder/modulator 622a receives main user's 1 decoding business datum.Then, encoder/modulator 622a encodes, interweaves and modulate the decoding business datum, and data symbol is provided.TX FH switch 624a receives data symbol from encoder/modulator 622a, and provides these symbols on the suitable subband of the Traffic Channel pl that distributes to main user 1, and described suitable subband is represented by the FH sequence pl that is associated with this Traffic Channel.TX FH switch 624a also can provide frequency pilot sign on suitable subband.TX FH switch 624a provides N emission symbol of N subband in each OFDM symbol period.Usually, the performed processing of encoder/modulator 622a and TX FH switch 624a is with identical in the performed processing of the encoder/modulator 314 of main user's 1 end and TX FH switch 316.
Channel simulator 628a simulates main user's 1 the terminal and the influence of the communication link between the 110x of base station.Channel simulator 628a receives from the emission symbol of TX FH switch 624a and main user 1 channel estimating.Then, channel simulator 628a utilizes channel estimation process emission symbol, with the estimation of the interference that obtains to be caused by main user 1.For example, channel simulator 628a can multiply by the emission symbol on each subband the channel gain estimation of this subband, with the interference components that obtains to be caused by main user 1 on this subband.
Receiving symbol comprises by sector s xMain user and the signal component of the symbol of time user emission.It from the Interference Estimation of channel simulator 628a the signal component of the symbol that sends by main user 1.This Interference Estimation comprises N interference components of N subband, and wherein, if main user 1 does not send data or frequency pilot sign on certain subband, then the interference components of this particular sub-band is zero.
Every terminal interference estimator 620a to 620p handles main user's 1 to P decoding business datum respectively.Channel simulator 628a to 628p in every terminal interference estimator 620a to 620p provides main user's 1 to P Interference Estimation respectively.
Interference eliminator 530 comprises N P input adder 630a to 630n and N two input adder 632a to 632n, promptly is used for one group of adder 630 and 632 of this N each subband of subband.Interference eliminator 530 receives N receiving symbol of this N subband from ofdm demodulator 416, and receives main user's 1 to P Interference Estimation from interference estimator 620a to 620p.In interference eliminator 530, adder 630a receives the interference components that is caused by P main user on the subband 1, and with its addition, provides the total interference on the subband 1 then.Each adder in other N-1 adder 630 of subband 2 to N receives the interference components that is caused by this P main user on the related subband, and with its addition, provides the total interference on this subband then.Adder 632a receives the total interference on the subband 1, and it is deducted from the receiving symbol of subband 1, provide then subband 1 elimination the symbol that disturbs.In other N-1 adder 632 of subband 2 to N each receives the total interference on the related subband similarly, and it is deducted from the receiving symbol of this subband, provide then this subband elimination the symbol that disturbs.Adder 632a to 632n provides N the symbol of having eliminated interference of N subband of each OFDM symbol period.
The block diagram of Fig. 7 shows an embodiment of the ofdm demodulator/RX data processor 440 in the base station 110y shown in Fig. 4 B in the asynchronous OFDMA system.In this embodiment, ofdm demodulator/RX data processor 440 comprises P main user's data processor 710a to 710p, interference estimator 720, interference eliminator 730 an and S time user's S data processor 740a to 740s, wherein, and P 〉=1 and S 〉=1.
To offer each among the data processor 710a to 710p from the recovery symbol of receiver unit 414.Each data processor 710 comprises: ofdm demodulator 712, RX FH switch 714, demodulator/decoder 716 and channel estimator 718.Ofdm demodulator 712 in each data processor 710 is carried out the OFDM demodulation based on the main user's who distributes to this data processor time to receiving symbol, and the sign estimation of N subband is provided.Then, RX FH switch 714, demodulator/decoder 716 and 718 pairs of sign estimation executable operations of channel estimator, the described RX FH of mode and Fig. 5 switch 514, demodulator/decoder 516 and channel estimator 518 are similar.Each data processor 740 also comprises ofdm demodulator 742, and it offsets the symbol execution OFDM demodulation except disturbing based on the inferior user's who distributes to this data processor time.
Fig. 8 shows the block diagram of an embodiment of interference estimator 720 in the ofdm demodulator shown in Fig. 4 B in the asynchronous OFDMA system/RX data processor 440 and interference eliminator 730.In this embodiment, interference estimator 720 comprises P every terminal interference estimator 820a to 820p of P main user.Distribute every terminal interference estimator 820, estimate the interference that causes by each main user.Each every terminal interference estimator 820 comprises: encoder/modulator 822, TX FH switch 824, OFDM modulator 826 and channel simulator 828.The mode of operation of encoder/modulator 822 and TX FH switch 824 is identical with TX FH switch 624 with the encoder/modulator 622 among Fig. 6.TX FH switch 824 provides N emission symbol of N subband in each OFDM symbol period.Then, OFDM modulator 826 is carried out the OFDM modulation to N emission symbol of each OFDM symbol period, and time-domain symbol is provided.
Then, the main user's that channel simulator 828 usefulness are distributed channel estimating is handled time-domain symbol, with the estimation of the interference that obtains to be caused by this main user.Because different main users is associated with the different time of asynchronous system,, thereby make from the Interference Estimation of channel simulator and receiving symbol time calibration so channel simulator 828 is also carried out sample rate conversion.
Interference eliminator 730 comprises a P input adder 830 and one two input adder 832.Interference eliminator 730 receives respectively from the receiving symbol of receiver unit 414 with from the main user's 1 to P of every terminal interference estimator 820a to 820p Interference Estimation.In interference eliminator 730, adder 830 is eliminated the interference that is caused by this P main user, and total interference is provided.Adder 832 deducts total interference from receiving symbol, provide then to have eliminated the symbol that disturbs, and S time user's data processor 740a to 740s handles it.
Embodiment suggestion shown in Fig. 5 and 6: the interference that estimation is caused by all P main users, and eliminate this interference, recover then from S user's data transmission.Sector s xMain user can be the soft handover user who carries out power control by a plurality of sectors in this user's the Active Set.If made it possible to recover by power control from this main user's data transmission, then sector s by other sectors in this Active Set xBase station 110x can't be to decoding from this main user's data transmission.If all can't be decoded from any main user's data transmission, so, base station 110x can not attempt to estimate and eliminate the interference that is caused by this main user.The base station can use the data of partial decoding of h to eliminate some interference.
Description to Fig. 5 and 6 also is applicable to such an embodiment above: sector s xA main user be sector s xNothing switch user, sector s xA time user be sector s xSoft handover user (no matter soft handover user serving sector).
For the embodiment shown in Fig. 5 and 6, after estimating and eliminating the interference that causes by main user, earlier main user is decoded, and then inferior user is decoded.Certainly, also can after estimate and eliminating the interference that causes by inferior user, earlier inferior user be decoded, and then main user is decoded.In a word, base station 110x can transmit from user's data according to any ordered pair and decode.Can estimate and eliminate caused interference, thereby improve the not decoded user's of residue signal quality by each user who successfully decodes.But,, then can simplified system realize if carry out power control and make and can successfully decode to them when having interference from the soft handover user to do not have switching the user.In this case, do not decode to there being the user of switching earlier, and then the soft handover user is decoded.
For the sake of simplicity, Fig. 5 and 6 has provided a kind of concurrent designing, and wherein: (1) provides a data processor 510 and every terminal interference estimator 620 for each main user; And (2) provide a data processor 540 for each time user.Also can use time division multiplexing design (TDM), wherein, provide a data processor 510, allow all main and secondary users that its time of carrying out is shared, every terminal interference estimator 620 is provided again, allow all main users that its time of carrying out is shared.
Fig. 9 is the flow chart that is used in the process 900 of wireless communication system (as frequency-hopped ofdm A system) emission data.Be in a plurality of base stations of using a plurality of sectors carry out each terminal of the state of soft handover can implementation 900.
At first, obtain the distribution (step 912) of Traffic Channel from first base station.For frequency-hopped ofdm A system, the Traffic Channel of being distributed is associated with a FH sequence, and this FH sequence table is shown in a concrete subband that is used for transfer of data in each time interval (being each hop period).Data are encoded and modulate, to obtain data symbol (step 914).For frequency-hopped ofdm A system, on the indicated subband of this FH sequence, provide described data symbol (step 916).Described data symbol is done further processing (as the OFDM modulation), and the traffic channel transmission of being distributed to pass through is to first base station and second base station (step 918).
The Traffic Channel that first base station is distributed is mutually orthogonal, and the Traffic Channel of distributing with second base station is non-orthogonal.For frequency-hopped ofdm A system, the Traffic Channel that first base station and second base station are distributed is associated with corresponding FH sequence separately.The FH sequence of the Traffic Channel that first base station is distributed is mutually orthogonal, and the FH sequence of the Traffic Channel of distributing with second base station is non-orthogonal.
Figure 10 is used at the flow chart of wireless communication system (as frequency-hopped ofdm A system) reception from the process 1000 of the transfer of data of a plurality of terminals.Process 1000 can be carried out by the base station of each sector.For clarity sake, sector s is described below xThe performed processing of base station x.
At first, obtain receiving symbol (step 1012).Receiving symbol comprises: (1) is from least one transfer of data at least one " master " Traffic Channel of at least one master terminal; And (2) are from least one transfer of data at least one " inferior " Traffic Channel of at least one time terminal.MSC is the Traffic Channel of being distributed by base station x, and inferior Traffic Channel then is the channel that is distributed by other base stations (as the adjacent base station of base station x).MSC is mutually orthogonal, and non-orthogonal with inferior Traffic Channel.MSC can be pseudorandom with respect to inferior Traffic Channel.Master terminal is the terminal of being distributed MSC by base station x, and inferior terminal is the terminal by other base station assigns time Traffic Channel.Each time terminal is in the state that soft handover is carried out (comprising base station x) at least two base stations of use, and can be by time Traffic Channel of other base station assigns except that the x of base station.
For the OFDMA system, obtain the receiving symbol of N subband from ofdm demodulator.For the OFDMA system, each Traffic Channel also is associated with corresponding FH sequence." master " FH sequence of MSC is mutually orthogonal, and non-orthogonal with " inferior " FH sequence of inferior Traffic Channel.
Handle receiving symbol, to obtain the decoded data (step 1014) of each master terminal.The interference (step 1016) that estimation is caused by master terminal, and it is eliminated from receiving symbol, to obtain to have eliminated the symbol (step 1018) that disturbs.Then, handle and eliminated the symbol that disturbs, to obtain the decoded data (step 1020) of each time terminal.
Processing for each master terminal comprises: (1) obtains by the receiving symbol on the indicated subband of the main FH sequence of the MSC of distributing to this master terminal; (2) obtain channel estimating (for example, based on the frequency pilot sign that receives from this master terminal) for this master terminal; And (3) carry out demodulation sign indicating number (for example, with the channel estimating of this master terminal) with the receiving symbol of this master terminal, to obtain the decoded data of this master terminal.In a similar manner, carry out processing, but be at the symbol of having eliminated interference for each time terminal, but not receiving symbol.
Can estimate the interference that caused by each master terminal in the following way: (1) is encoded to the decoded data of this master terminal and is modulated; (2) on the subband indicated, provide this data symbol by the FH sequence of distributing to this master terminal; And (3) are with this data symbol of channel estimation process, with the interference that obtains to be caused by this master terminal.The interference that is caused by each master terminal can be merged, with the total interference that obtains to cause by described master terminal.
Technology described herein can be used for the wireless communication system of frequency-hopped ofdm A system and other types.For example, these technology can be used for adopting the system of other multi-carrier modulation technologies such as Discrete multi-tone (DMT).The wireless communication system that these technology also can be used for not using the wireless communication system of multi-carrier modulation and do not adopt frequency hopping.
Technology described herein can be used for otherwise defining the system of Traffic Channel.For frequency-hopped ofdm A system, Traffic Channel is that the FH sequence by association defines, and this FH sequence table is shown in a concrete subband that uses in each hop period.For the Time Division Multiplexing system, can in time slot, transmit data, and can be the different time slot of a plurality of traffic channel assignments.The Traffic Channel of each sector can be defined as mutually orthogonal, thereby make any two Traffic Channels can not use identical time slot.The Traffic Channel of different sectors can be pseudorandom, thereby makes the Traffic Channel of a sector and the Traffic Channel of another sector can use identical time slot (so they will conflict).Technology described herein also can be used for this TDM system.Each soft handover user distributes a Traffic Channel by its serving sector.The main user's data transmission from this sector is recovered in each sector, eliminates the interference that is caused by these main users, recovers the inferior user's data transmission from this sector then.
As mentioned above, technology described herein can be used for supporting the soft handover on the reverse link.These technology also can be used for supporting More Soft Handoff, and in More Soft Handoff, a terminal uses a plurality of sectors of same cells to communicate.For soft handover and More Soft Handoff, can carry out identical processing with end in the base station.
Technology described herein also can be used for forward link.For example, terminal can receive on the forward link from specific user's transfer of data of a base station with from the overhead transmission (as broadcast transmitted) of a plurality of base stations.This terminal can be handled its received signal, with the specific user transfer of data of recovery from described base station, and the interference that estimation and elimination are caused by specific user's transfer of data, and handle and eliminated interference signals, to recover overhead transmission from a plurality of base stations.
Technology described herein can realize in various manners.For example, these technology available hardware, software and way of hardware and software combination realize.Realize that for hardware the processing unit in the base station (as data processor 510 and 540, interference eliminator 520, interference eliminator 530 etc.) can be implemented as one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processor spare (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, is designed to carry out other electronic units and the combination thereof of institute's representation function here.Processing unit (as encoder/modulator 314, TX FH switch 316, OFDM modulator 318 etc.) in the terminal also can be implemented among one or more ASIC, the DSP etc.
Realize that for software technology described herein can realize with the module (as process, function etc.) of carrying out function described herein.These software codes can be stored in the memory cell (as the memory cell among the memory cell among Fig. 3 332 and Fig. 4 432), and are carried out by processor (as controller 330 and 430).Memory cell can be implemented in the processor or outside the processor, if be implemented in outside the processor, memory cell can be connected to processor communicatedly via variety of way well known in the art.
The front provides the description to disclosed embodiment, so that those skilled in the art can make and use the present invention.For those skilled in the art, under the prerequisite that does not break away from the present invention spirit and protection range, be conspicuous to the various modifications of these embodiment, and Ding Yi universal principle also is applicable to other embodiment here.Therefore, the invention is not restricted to embodiment given here, but consistent with the broad range of principle disclosed herein and novel feature.

Claims (31)

1, a kind of method that is used for receiving at wireless communication system transfer of data comprises:
Obtain from the receiving symbol of a plurality of transfer of data on a plurality of MSCs of a plurality of master terminals with from the receiving symbol of a plurality of transfer of data on a plurality of the Traffic Channels of a plurality of terminals, wherein, described a plurality of MSC is mutually orthogonal, and non-orthogonal with described a plurality of Traffic Channels;
Handle described receiving symbol, to obtain the decoded data of each master terminal in described a plurality of master terminal;
The interference that estimation is caused by described a plurality of master terminals;
From described receiving symbol, eliminate the described interference that causes by described a plurality of master terminals, eliminated the symbol that disturbs to obtain; And
Handle the described symbol that disturbs of having eliminated, to obtain the decoded data of each time terminal in described a plurality of the terminals.
2, the method for claim 1, wherein described wireless communication system is a frequency-hopping communication system.
3, method as claimed in claim 2, wherein, described a plurality of MSC and described a plurality of Traffic Channels are associated with corresponding frequency hopping FH sequence separately, and described frequency hopping FH sequence table is shown in a concrete subband of a plurality of subbands that are used for transfer of data in each time interval.
4, the method for claim 1, wherein described wireless communication system is a synchro system.
5, the method for claim 1, wherein described wireless communication system is an asynchronous system.
6, a kind of method that is used for receiving at the place, base station of wireless frequency hopping FH communication system transfer of data comprises:
Obtain the receiving symbol of a plurality of subbands;
Handle described receiving symbol, to obtain the decoded data of each master terminal in a plurality of master terminals, wherein, a plurality of main frequency hopping FH sequence that is used for transfer of data is assigned to described a plurality of master terminal, and wherein, described a plurality of main frequency hopping FH sequences are mutually orthogonal;
The interference that estimation is caused by described a plurality of master terminals;
From described receiving symbol, eliminate the described interference that causes by described a plurality of master terminals, eliminated the symbol that disturbs to obtain; And
Handle the described symbol that disturbs of having eliminated, to obtain the decoded data of each time terminal in a plurality of terminals, wherein, a plurality of frequency hopping FH sequences that are used for transfer of data are assigned to described a plurality of terminals, and wherein, described a plurality of frequency hopping FH sequences and described a plurality of main frequency hopping FH sequence are non-orthogonal.
7, method as claimed in claim 6, wherein, described a plurality of master terminals are given with described a plurality of main frequency hopping FH sequence allocation in described base station, and wherein, the adjacent base station of described base station is given described a plurality of terminals with described a plurality of frequency hopping FH sequence allocation.
8, method as claimed in claim 6, wherein, time terminal of each in described a plurality of the terminals is in to use and comprises that at least two base stations of described base station carry out the state of soft handover.
9, method as claimed in claim 8, wherein, the terminal first time in described a plurality of the terminals is in the state that soft handover is carried out at least two base stations of using at least two different sectors of a sub-district in the described system.
10, method as claimed in claim 8, wherein, the terminal first time in described a plurality of the terminals is in the state that soft handover is carried out at least two base stations of using two different districts in the described system.
11, method as claimed in claim 8, wherein, a base station in described at least two base stations except that described base station is one the frequency hopping FH sequence of each time terminal distribution in described a plurality of the terminals.
12, method as claimed in claim 6, wherein, described a plurality of master terminals comprise the terminal that is not in soft changing state and only communicates with described base station.
13, method as claimed in claim 12, wherein, described a plurality of master terminals also comprise be in soft changing state and by described base station assigns the terminal of frequency hopping FH sequence.
14, method as claimed in claim 6, wherein, described a plurality of main frequency hopping FH sequences are pseudorandom with respect to described a plurality of frequency hopping FH sequences.
15, method as claimed in claim 6, wherein, the step of the described receiving symbol of described processing comprises:
For each master terminal in described a plurality of master terminals,
Obtain by the receiving symbol on the indicated subband of the main frequency hopping FH sequence of distributing to described master terminal;
Obtain the channel estimating of described master terminal; And
Described receiving symbol to described master terminal carries out the demodulation sign indicating number, to obtain the decoded data of described master terminal.
16, method as claimed in claim 6, wherein, described estimating step comprises:
For each master terminal in described a plurality of master terminals,
The described decoded data of described master terminal is encoded and modulated, to obtain the data symbol of described master terminal;
The described data symbol of described master terminal is provided on the subband indicated by the main frequency hopping FH sequence of distributing to described master terminal; And
Utilize the channel estimating of described master terminal, handle the described data symbol of described master terminal, to obtain the interference that causes by described master terminal; And
The interference that will be caused by each master terminal in described a plurality of master terminals merges, to obtain the interference that is caused by described a plurality of master terminals.
17, method as claimed in claim 6, wherein, the described step of having eliminated the symbol that disturbs of described processing comprises:
For each time terminal in described a plurality of the terminals,
Obtained by the elimination on the indicated subband of the inferior frequency hopping FH sequence of distributing to described terminal the symbol that disturbs; And
To the elimination of described terminal the symbol that disturbs carry out the demodulation sign indicating number, to obtain the described decoded data of described terminal.
18, method as claimed in claim 6, wherein, described wireless communication system is the OFDM ofdma communication system.
19, a kind of device in the wireless frequency hopping FH communication system comprises:
Acquisition module is used to obtain the receiving symbol of a plurality of subbands;
Be used to handle the processing module of described receiving symbol, to obtain the decoded data of each master terminal in a plurality of master terminals, wherein, a plurality of main frequency hopping FH sequence that is used for transfer of data is assigned to described a plurality of master terminal, and wherein, described a plurality of main frequency hopping FH sequence is mutually orthogonal;
Estimation module is used to estimate the interference that is caused by described a plurality of master terminals;
Cancellation module is used for eliminating the described interference that is caused by described a plurality of master terminals from described receiving symbol, has eliminated the symbol that disturbs to obtain; And
Be used to handle the described processing module of having eliminated the symbol that disturbs, to obtain the decoded data of each time terminal in a plurality of terminals, wherein, a plurality of frequency hopping FH sequences that are used for transfer of data are assigned to described a plurality of terminals, and wherein, described a plurality of frequency hopping FH sequences and described a plurality of main frequency hopping FH sequence are non-orthogonal.
20, a kind of device in the wireless frequency hopping FH communication system comprises:
A plurality of first data processors are used to handle receiving symbol, to obtain the decoded data of each master terminal in a plurality of master terminals, wherein, the a plurality of main frequency hopping FH sequence that is used for transfer of data is assigned to described a plurality of master terminal, and wherein, described a plurality of main frequency hopping FH sequences are mutually orthogonal;
Interference estimator is used to estimate the interference that is caused by described a plurality of master terminals;
Interference eliminator is used for eliminating the described interference that is caused by described a plurality of master terminals from described receiving symbol, has eliminated the symbol that disturbs to obtain; And
A plurality of second data processors, be used to handle the described symbol that disturbs of having eliminated, to obtain the decoded data of each time terminal in a plurality of terminals, wherein, a plurality of frequency hopping FH sequences that are used for transfer of data are assigned to described a plurality of terminals, and wherein, described a plurality of frequency hopping FH sequences and described a plurality of main frequency hopping FH sequence are non-orthogonal.
21, device as claimed in claim 20 wherein, in described a plurality of first data processors each is distributed to a corresponding master terminal in described a plurality of master terminal, and wherein, described first data processor of each master terminal comprises:
Switch is used to obtain by the receiving symbol on the indicated subband of the main frequency hopping FH sequence of distributing to described master terminal;
Channel estimator is used to obtain the channel estimating of described master terminal; And
Demodulator and decoder are used for the described receiving symbol of described master terminal is carried out the demodulation sign indicating number, to obtain the described decoded data of described master terminal.
22, device as claimed in claim 20, wherein, described interference estimator comprises a plurality of every terminal interference estimator, described every terminal interference estimator is used for estimating an interference that corresponding master terminal causes by described a plurality of master terminals separately, and wherein, described every terminal interference estimator of each master terminal comprises:
Encoder and modulator are used for the described decoded data of described master terminal is encoded and modulated, to obtain the data symbol of described master terminal;
Switch is used for providing the described data symbol of described master terminal on the subband indicated by the main frequency hopping FH sequence of distributing to described master terminal; And
Channel simulator is used to utilize the channel estimating of described master terminal, handles the described data symbol of described master terminal, to obtain the interference that is caused by described corresponding master terminal.
23, a kind of method that sends data in wireless communication system from terminal comprises:
Obtain the distribution of Traffic Channel from first base station;
Data are encoded and modulated, to obtain data symbol; And
Handle by the described data symbol of described Traffic Channel to described first base station and second base station transmits, wherein mutually orthogonal by the Traffic Channel of described first base station assigns, and with non-orthogonal by the Traffic Channel of described second base station assigns;
Wherein, before the transmission that recovers from other-end, described first base station receives and handles the transmission from described terminal, then, elimination is from the interference of described terminal, wherein has been assigned to described other-end with non-orthogonal other Traffic Channels of the described Traffic Channel of distributing to described terminal; Perhaps
Wherein, before the transmission that recovers from described terminal, described second base station receives and handles the transmission from other-end, then, eliminates the interference from described other-end, has wherein distributed other Traffic Channels for described other-end by described second base station.
24, method as claimed in claim 23, wherein, described wireless communication system is a frequency-hopping communication system.
25, method as claimed in claim 24, wherein, be associated with corresponding frequency hopping FH sequence separately by the Traffic Channel of described first base station assigns with by the Traffic Channel of described second base station assigns, described frequency hopping FH sequence indication is used for a concrete subband of a plurality of subbands of transfer of data in each time interval.
26, method as claimed in claim 23, wherein, described first and second base stations are used for two different sectors of a sub-district of described system.
27, method as claimed in claim 23, wherein, described first and second base stations are used for two different districts of described system.
28, a kind of being used for comprises in the method for wireless frequency hopping FH communication system from terminal transmission data:
Obtain the distribution of frequency hopping FH sequence from first base station;
Data are encoded and modulated, to obtain data symbol;
On the subband indicated, provide described data symbol by described frequency hopping FH sequence; And
The described data symbol to described first base station and second base station transmits is desired in processing, and is wherein mutually orthogonal by the frequency hopping FH sequence of described first base station assigns, and with non-orthogonal by the frequency hopping FH sequence of described second base station assigns;
Wherein, before the transmission that recovers from other-end, described first base station receives and handles the transmission from described terminal, then, elimination is from the interference of described terminal, wherein has been assigned to described other-end with non-orthogonal other frequency hoppings FH sequence of the frequency hopping FH sequence of distributing to described terminal; Perhaps
Wherein, before the transmission that recovers from described terminal, described second base station receives and handles the transmission from other-end, then, elimination has wherein distributed other frequency hoppings FH sequence for described other-end by described second base station from the interference of described other-end.
29, method as claimed in claim 28 wherein, is pseudorandom by the frequency hopping FH sequence of described first base station assigns with respect to the frequency hopping FH sequence by described second base station assigns.
30, a kind of device in the wireless frequency hopping FH communication system comprises:
Acquisition module is used for obtaining from first base station distribution of frequency hopping FH sequence;
Coding and modulation module are used for data are encoded and modulated, to obtain data symbol;
Module is provided, is used on subband, providing described data symbol by described frequency hopping FH sequence indication; And
Processing module is used to handle the described data symbol of desiring to described first base station and second base station transmits, and is wherein mutually orthogonal by the frequency hopping FH sequence of described first base station assigns, and with non-orthogonal by the frequency hopping FH sequence of described second base station assigns;
Wherein, before the transmission that recovers from other devices, described first base station receives and handles the transmission from described device, then, elimination is from the interference of described device, wherein has been assigned to described other devices with non-orthogonal other frequency hoppings FH sequence of the frequency hopping FH sequence of distributing to described device; Perhaps
Wherein, before the transmission that recovers from described device, described second base station receives and handles the transmission from other devices, then, elimination has wherein distributed other frequency hoppings FH sequence for described other devices by described second base station from the interference of described other devices.
31, a kind of device in the wireless frequency hopping FH communication system comprises:
Controller is used for obtaining from first base station distribution of frequency hopping FH sequence;
Encoder and modulator are used for data are encoded and modulated, to obtain data symbol;
Switch is used for providing described data symbol on the subband by described frequency hopping FH sequence indication; And
The modulating in OFDM device, be used to handle the described data symbol of desiring to described first base station and second base station transmits, wherein, mutually orthogonal by the frequency hopping FH sequence of described first base station assigns, and with non-orthogonal by the frequency hopping FH sequence of described second base station assigns;
Wherein, before the transmission that recovers from other devices, described first base station receives and handles the transmission from described device, then, elimination is from the interference of described device, wherein has been assigned to described other devices with non-orthogonal other frequency hoppings FH sequence of the frequency hopping FH sequence of distributing to described device; Perhaps
Wherein, before the transmission that recovers from described device, described second base station receives and handles the transmission from other devices, then, elimination has wherein distributed other frequency hoppings FH sequence for described other devices by described second base station from the interference of described other devices.
CN200480012768A 2003-05-12 2004-05-07 Method and device for soft handoff with interference cancellation in a wireless frequency hopping communication system Expired - Fee Related CN100592651C (en)

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