CN102075301A - Wireless communication system as well as base station and symbol sending method thereof - Google Patents

Wireless communication system as well as base station and symbol sending method thereof Download PDF

Info

Publication number
CN102075301A
CN102075301A CN2009102265256A CN200910226525A CN102075301A CN 102075301 A CN102075301 A CN 102075301A CN 2009102265256 A CN2009102265256 A CN 2009102265256A CN 200910226525 A CN200910226525 A CN 200910226525A CN 102075301 A CN102075301 A CN 102075301A
Authority
CN
China
Prior art keywords
symbol
loaded
base station
sub
cell base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2009102265256A
Other languages
Chinese (zh)
Inventor
徐静
徐�明
张治�
星野正幸
今村大地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to CN2009102265256A priority Critical patent/CN102075301A/en
Priority to PCT/CN2010/078928 priority patent/WO2011060736A1/en
Publication of CN102075301A publication Critical patent/CN102075301A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606—Space-frequency coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention provides a wireless communication system and a method for sending symbols to a user terminal by base stations of a plurality of cells according to a cooperation multipoint transmission way. The method comprises the steps of: loading the symbols on an orthogonal frequency division multiplexing subcarrier according to a coding way of a space-frequency block code in the base station of each cell, wherein continuous symbols are loaded on the subcarrier with weak relativity and symbol pairs encoded according to the space-frequency block code are loaded on two subcarriers with strong relativity; carrying out cycle delay operation on the symbols loaded on the orthogonal frequency division multiplexing subcarrier among the corresponding transmitting antennas of the base station of each cell; and sending the symbols subjected to the cycle delay operation to the user terminal according to the cooperation multipoint transmission way. The method is not affected by the amount of the cells, is in step with the technology in the LTE (Long Term Evolution) standard Re 1-8 versions and can provide enhanced frequency diversity gains of the base stations of a plurality of cells.

Description

Wireless communication system and base station thereof and symbol sending method
Technical field
The present invention relates generally to the communications field, relate in particular to the base station in wireless communication system, this system and in described wireless communication system, adopt cooperative multipoint transmission mode to send the method for symbol to user terminal by the base station of a plurality of sub-districts.
Background technology
At present, for many antennas modern wireless communication systems based on OFDM (OFDM), LTE-A (Long Term Evolution-Advanced) in for example designing, down collaboration multicast communication (Coordinated Multi-Point transmission/reception, CoMP) showing its technological merit aspect the average throughput of throughput that improves Cell Edge User and whole sub-district, therefore receiving much concern.
Research work before most of concentrates on closed loop down collaboration multicast communication technology.Yet the closed-loop communication system has following defective.At first, though the closed-loop communication system can bring huge performance gain, because the cooperative multipoint transmission technology relates to a plurality of transmitting antennas, thereby the expense of feedback information is also very big.Secondly, the influence of the channel condition information quality that the performance of closed loop transmission can be fed back.In addition, for some actual transmissions scenes, for example in a plurality of cell cooperative joint transmission schemes of medium translational speed travelling carriage, under the time varying channel situation, the channel condition information of feedback might lose efficacy because of out-of-date.Therefore, be necessary to study the cooperative multipoint transmission technology of open loop.With respect to single subdistrict transmit diversity techniques (TxD), the joint transmit diversity technology of a plurality of sub-districts (CoMP TxD) has the potential that obtains better bit error rate performance, and this is because cooperative multipoint transmission can improve the received signal to noise ratio at travelling carriage place.
Consider back compatible, when the joint transmit diversity technical scheme of a plurality of sub-districts of design, should emphasis take into account the characteristics of existing Cellular Networks technology.In other words, in the joint transmit diversity technical scheme of designed a plurality of sub-districts, the collaborative signaling consumption of a plurality of minizones should be the least possible, thereby be beneficial to Project Realization near actual conditions as far as possible.Specifically, this technical scheme should have the general transmission structure that not influenced by the actual number of cells of participating in cooperative multipoint transmission; And should keep consistency with the single subdistrict transmit diversity techniques in the LTE standard Rel-8 version as far as possible.Consider that according to these designs a scheme of expecting easily is the single subdistrict transmit diversity techniques that reuses in the LTE standard Rel-8 version.At present, proposed the transmit diversity techniques in the LTE standard Rel-8 version is combined with the single frequency network transmission plan, be applied to multimedia broadcasting Single Frequency Network (MBSFN, Multimedia BroadcastSingle Frequency Network) frame.This scheme can be thought a kind of simple descending grand diversity technique.
Fig. 1 shows the transmit diversity techniques in the LTE standard Rel-8 version combined with the single frequency network transmission plan and is applied to the schematic architectural diagram of MBSFN.As shown in Figure 1, adopt transmit diversity techniques to send data as sub-district 1 to sub-district M in a plurality of sub-districts to user terminal UE.Thus, send identical data on the respective antenna of sub-district M in sub-district 1, thereby at user terminal, sub-district 1 is an antenna to the respective antenna equivalence of sub-district M, and by the data of the respective antenna transmission of sub-district 1 to M in user terminal place simple superposition.For example, first antenna of sub-district 1 is via channel
Figure B2009102265256D0000021
First antenna of sub-district 2 is via channel
Figure B2009102265256D0000022
Up to first antenna of sub-district M via channel
Figure B2009102265256D0000023
All send identical data, thereby this M root antenna is equivalent to one via channel H at user terminal (1)Send the antenna of signal; Equally, second antenna of sub-district 1 is via channel
Figure B2009102265256D0000024
Second antenna of sub-district 2 is via channel
Figure B2009102265256D0000025
Up to second antenna of sub-district M via channel
Figure B2009102265256D0000026
All send identical data, thereby this M root antenna is equivalent to one via channel H at user terminal (2)Send the antenna of signal.On the other hand, in the M of sub-district, the data symbol that all adopts space-time/frequency block code (SFBC, space frequency block code) to send is loaded on the OFDM subcarrier in proper order in sub-district 1, so that arrive user terminal via antenna transmission.
Yet though such scheme need not the collaborative signaling of many minizones, the space diversity gain of a plurality of sub-districts is very limited.Therefore, in the art, need research can obtain multi-plot joint transmit diversity techniques a plurality of cell base station space diversity gains, open loop.
Summary of the invention
According to an aspect of the present invention, provide a kind of being used for to adopt cooperative multipoint transmission mode to send the method for symbol to user terminal by the base station of a plurality of sub-districts at wireless communication system.This method comprises: in each cell base station, the coded system of the symbol that will send via transmitting antenna according to space-time/frequency block code is loaded on the OFDM subcarrier; Between the corresponding transmitting antenna of each cell base station, the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; According to cooperative multipoint transmission mode, the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.
In the method aspect above-mentioned according to the present invention, when being loaded into OFDM subcarrier on according to the coded system of space-time/frequency block code symbol, continuous symbol is loaded on the OFDM subcarrier a little less than the correlation, simultaneously will be right according to the symbol of space-time/frequency block code coding, be loaded on two strong OFDM subcarriers of correlation.
According to a further aspect of the invention, provide a kind of wireless communication system, this system comprises a plurality of sub-districts, and the base station of described a plurality of sub-districts adopts cooperative multipoint transmission mode to send symbol to user terminal.Described base station comprises: the symbol loading component is used for the symbol that will send via transmitting antenna is loaded into the OFDM subcarrier according to the coded system of space-time/frequency block code; The cyclic delay operation parts are used for the transmitting antenna at cell base station, and the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; And transmit block, be used for according to cooperative multipoint transmission mode, the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.Described user terminal comprises: receiving-member is used to receive the symbol from each cell base station; With the space-time/frequency block code detection part, be used to the symbol of decoding and encoding according to space-time/frequency block code.
In the wireless communication system aspect above-mentioned according to the present invention, symbol loading component in the base station is when carrying out described loading, continuous symbol is loaded on the OFDM subcarrier a little less than the correlation, simultaneously will be right according to the symbol of space-time/frequency block code coding, be loaded on two strong OFDM subcarriers of correlation.
According to another aspect of the present invention, provide a kind of cell base station that in wireless communication system, adopts cooperative multipoint transmission mode to user terminal transmission symbol, wherein comprised a plurality of described cell base stations in this wireless communication system.This cell base station comprises: the symbol loading component is used for the symbol that will send via transmitting antenna is loaded into the OFDM subcarrier according to the coded system of space-time/frequency block code; The cyclic delay operation parts are used for the transmitting antenna at cell base station, and the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; And transmit block, be used for according to cooperative multipoint transmission mode, the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.
In the base station aspect above-mentioned according to the present invention, the symbol loading component is when carrying out described loading, continuous symbol is loaded on the OFDM subcarrier a little less than the correlation, simultaneously will be right according to the symbol of space-time/frequency block code coding, be loaded on two strong OFDM subcarriers of correlation.
Said method of the present invention, system and base station provide a kind of open loop cooperative multipoint transmission scheme of novelty.This scheme be not subjected to actual participation cooperative multipoint transmission number of cells influence and be consistent with single subdistrict transmit diversity techniques in the mouth E standard Rel-8 version, and can provide the frequency diversity gain of the enhancing of a plurality of cell base stations.Thereby, improved the throughput of Cell Edge User and the average throughput of whole sub-district, reduced feedback quantity.
Description of drawings
From below in conjunction with the detailed description of accompanying drawing to the embodiment of the invention, these and/or others of the present invention and advantage will become clear more and be more readily understood, wherein:
Fig. 1 shows the transmit diversity techniques in the LTE standard Rel-8 version combined with the single frequency network transmission plan and is applied to the schematic architectural diagram of MBSFN.
Fig. 2 shows the OFDM modulated process on the single antenna when adopting the cyclic delay diversity technology.
Fig. 3 (a) illustration according to the implementation procedure of the cyclic delay operation in the data transmission method for uplink of first embodiment of the invention in time domain.
Fig. 3 (b) illustration according to the implementation procedure of the cyclic delay operation in the data transmission method for uplink of first embodiment of the invention in frequency domain.
Fig. 4 (a) and Fig. 4 (b) show the single subdistrict emission diversity scheme in the LTE standard Rel-8 version.
Fig. 5 (a)-5 (d) shows when two sub-districts participate in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention the example that data symbol is loaded on the OFDM subcarrier is loaded situation.
Fig. 6 (a)-(f) shows when three sub-districts participate in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention the example that data symbol is loaded on the OFDM subcarrier is loaded situation.
Fig. 7 (a)-(b) shows when four sub-districts participate in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention the example that data symbol is loaded on the OFDM subcarrier is loaded situation.
Fig. 8 (a)-(f) shows when M sub-district participates in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention the example that data symbol is loaded on the OFDM subcarrier is loaded situation.
Fig. 9 illustration when four and five sub-districts participate in cooperative multipoint transmission, a plurality of time are joined together as the schematic diagram of the least unit of scheduling of resource.
Figure 10 shows and will be applied to the schematic diagram of multimedia broadcasting single frequency network according to the scheme embodiment of the invention, that application cycle postpones diversity technique between the respective antenna of many sub-districts.
Figure 11 show according to first embodiment of the invention, adopt the flow chart of cooperative multipoint transmission mode by the base station of a plurality of sub-districts to user terminal to transmit data.
Figure 12 is the diagram of application according to relevant device in the wireless communication system of the data transmission method for uplink of the embodiment of the invention.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with accompanying drawing.If consider and to obscure main points of the present invention, then can not provide its detailed description here to the detailed description of some related art.In each embodiment, identical Reference numeral is used to represent to carry out the element or the unit of identical function.
In addition, the present invention is applicable to that the base station sends all signals to travelling carriage, has both comprised that reference signal also comprises data-signal.In following embodiment, major part is to describe the inventive method with the example that is described as of data symbol.Those skilled in the art can be generalized to the description to the data symbol sending method transmission to reference signal, this same design according to the invention.
(first embodiment)
The cyclic delay diversity technology is a kind of single sub-district transmit diversity techniques that not influenced by number of transmit antennas.Fig. 2 shows the OFDM modulated process on the single antenna when adopting the cyclic delay diversity technology.As shown in Figure 2, the input data symbol experiences S-point IFFT in S-point, inverse fast Fourier transform (IFFT) unit 210 after, in parallel/serial transducer 212, be converted into string character, subsequently, the 214 pairs of string characters in circulation delay unit circulate mobile, at last, the data symbol of Cyclic Prefix maker 216 after circulation is moved adds Cyclic Prefix, thereby forms the OFDM symbol.Postpone diversity technique by application cycle between many antennas of single subdistrict, the space diversity gain of many antennas can be converted into the reinforcement frequency diversity gain of equivalence.
Space diversity gain for the multi-cell base station that obtains enhancing, in the present embodiment with the cyclic delay diversity technological expansion of single subdistrict to a plurality of sub-districts of carrying out cooperative multipoint transmission the harmonious while sends data to portable terminal so that a plurality of cell base station utilizes cyclic delay diversity.
Figure 11 show according to present embodiment, adopt the flow chart of cooperative multipoint transmission mode by the base station of a plurality of sub-districts to user terminal to transmit data.At step S101, in each cell base station, the coded system of data symbol according to space-time/frequency block code is loaded on the OFDM subcarrier; At step S102, between the corresponding transmitting antenna of each cell base station, the data symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; At step S103,, the data symbol after the cyclic delay operation is sent to user terminal according to cooperative multipoint transmission mode.As previously mentioned, in this data transmission method for uplink of present embodiment, postpone diversity technique, the frequency diversity gain that can obtain to strengthen by application cycle between the corresponding transmitting antenna of a plurality of cell base stations.
Shown in Fig. 2 is the realization of single sub-district cyclic delay diversity technology in time domain.In fact, the cyclic delay operation among the step S102 in the above-mentioned data transmission method for uplink both can realize also can realizing in frequency domain in time domain.This is to be equivalent in frequency domain because of the cyclic delay operation to time domain sequences this sequence be multiply by the corresponding frequency domain phase-shifts factor.Because the realization of cyclic delay operation in time domain and frequency domain is well known to a person skilled in the art, therefore only these two kinds of implementations are carried out simple explanation below.
Fig. 3 (a) illustration according to the implementation procedure of the cyclic delay operation in the data transmission method for uplink of first embodiment of the invention in time domain.Situation when wherein, two width of cloth figure up and down among this figure show cell base station respectively and have 2 and 4 transmit antennas.Shown in Fig. 3 (a), data symbol is after the coded system according to space-time/frequency block code is loaded on the OFDM subcarrier, and experience N point IFFT operates.Subsequently, the data symbol through the IFFT operation is carried out cyclic delay operation.In this cyclic delay operation, each cell base station adopts the predetermined cyclic delay values corresponding with this cell base station, and is under the jurisdiction of 2 of same cell base station or 4 transmit antennas and adopts same predetermined cyclic delay values.At last, to circulation delay the data symbol of predetermined delay value add cyclic prefix CP.In the present embodiment, preferably, the predetermined cyclic delay values of each cell base station is
Figure B2009102265256D0000061
I=1,2 ..., M, wherein M is for participating in the number of cells of cooperative multipoint transmission, and N is counting of IFFT operation, and i is the sign of sub-district.
Fig. 3 (b) illustration according to the implementation procedure of the cyclic delay operation in the data transmission method for uplink of first embodiment of the invention in frequency domain.Situation when wherein, two width of cloth figure up and down among this figure show cell base station respectively and have 2 and 4 transmit antennas.Shown in Fig. 3 (b), in each cell base station, data symbol is loaded on the corresponding OFDM subcarrier according to the coded system of space-time/frequency block code, subsequently, is loaded into the predetermined phase translocation factor that data symbol sequence on the corresponding OFDM subcarrier multiply by this cell base station.Realize identically with aforesaid time domain, be under the jurisdiction of 2 of same cell base station or 4 transmit antennas and adopt same predetermined phase translocation factor.Then, multiply by data symbol experience IFFT operation after the phase-shifts factor.At last, the data symbol after the IFFT operation adds cyclic prefix CP.In the present embodiment, preferred, the predetermined phase translocation factor that each cell base station adopts on k subcarrier is
Figure B2009102265256D0000062
Cyclic delay values Δ wherein i=(i-1) N/M, i=1,2 ..., M, M is for participating in the number of cells of cooperative multipoint transmission, and N is counting of described IFFT operation, and i is the sign of sub-district, and k is OFDM subcarrier sign.
Above simple declaration the implementation procedure of cyclic delay operation in time domain and frequency domain.In general, the time domain operation is lower than the implementation complexity of frequency-domain operations, thereby is easier to realize.Yet in some cases, frequency-domain operations has its superiority.For example, when time domain was carried out cyclic delay operation, cyclic shift length should be the integral multiple of time sampling.Therefore, at the formula of the predetermined cyclic delay values that is used for determining each cell base station as previously mentioned
Figure B2009102265256D0000063
In, N/M is rounded downwards just in order to satisfy the requirement that cyclic shift length need be the time sampling integral multiple.And when the points N of IFFT operation be not when carrying out the integral multiple of number of cells M of cooperative multipoint transmission, this operation that rounds downwards will cause faulty subcarrier correlation.That is, make that incoherent adjacent sub-carrier becomes the adjacent sub-carrier that has weak correlation under the situation of not dividing exactly under the situation dividing exactly, thereby influence final diversity of wireless communication system and bit error rate performance.And when realizing cyclic delay operation in frequency domain, the phase-shifts factor does not need the operation that rounds downwards, thereby can not divided exactly by M and bring performance loss owing to N.In addition, when data channel and other channel multiplexing, realize that at frequency domain cyclic delay operation has more flexibility.
What deserves to be mentioned is, in data transmission method for uplink according to present embodiment, except carrying out the cyclic delay operation between the corresponding transmitting antenna of each cell base station, each participates in send mode that the cell base station of cooperative multipoint transmission adopts is identical with traditional single sub-district emission diversity scheme.For example, in the step S101 of this data transmission method for uplink, in each cell base station, carry out described load operation according to the single subdistrict emission diversity scheme in the LTE standard Rel-8 version.Fig. 4 (a) and Fig. 4 (b) show the single subdistrict emission diversity scheme in the LTE standard Rel-8 version.
Shown in Fig. 4 (a), when single subdistrict has two transmit antennas, the coded system of data symbol according to space-time/frequency block code is loaded on the OFDM subcarrier.Concrete, for a pair of adjacent data symbol, for example S K1And S K2, on antenna Tx1, at adjacent subcarrier k 1And k 2Last loading symbol S K1And S K2And on antenna Tx2, at adjacent sub-carrier k 1And k 2Last loading symbol
Figure B2009102265256D0000071
With
Figure B2009102265256D0000072
Shown in Fig. 4 (b), when single subdistrict had four transmit antennas, a pair of transmitting antenna that takies earlier wherein loaded, and after having loaded a pair of adjacent data symbol, switched to another transmitting antenna is loaded.Concrete, for for example a pair of adjacent data symbol S 1And S 2, take antenna Tx1 and Tx3 loaded.Wherein on antenna Tx1, on adjacent subcarrier 1 and 2, load symbol S 1And S 2On antenna Tx3, on adjacent sub-carrier 1 and 2, load symbol
Figure B2009102265256D0000073
With
Figure B2009102265256D0000074
Then, switch to antenna to Tx2 and Tx4 loading a pair of adjacent data symbol S subsequently 3And S 4Wherein, on antenna Tx2, on adjacent sub-carrier 3 and 4, load symbol S 3And S 4On antenna Tx4, on adjacent sub-carrier 3 and 4, load symbol With And the like, antenna between switch, and according to the coded system loading data symbol of space-time/frequency block code.
(second embodiment)
As mentioned above, in the data transmission method for uplink of first embodiment of the invention, cyclic delay diversity technology and space-time/frequency block code scheme have been adopted.Postpone diversity technique, the frequency diversity gain that can obtain to strengthen by application cycle between the corresponding transmitting antenna of a plurality of cell base stations.
Yet, we know, postponing diversity technique in a plurality of minizones application cycle will become the single delivery channel of single input to the single delivery channel equivalence of many inputs, and this equivalent channel has more significantly frequency selectivity, thereby original high correlation does not exist between adjacent sub-carrier.Simple space-time/frequency block code detector has implied a requirement, that be exactly be used to transmit a pair of will be much at one according to the channel gain on two subcarriers of space-time/frequency block code coded data symbol, that is to say that the channel gain on these two subcarriers need have high correlation.
Therefore, in the present embodiment the data transmission method for uplink according to first embodiment is improved.Data transmission method for uplink according to present embodiment comprises aforesaid step S101-S103 equally, different is, when in step S101, the coded system of data symbol according to space-time/frequency block code being loaded on the OFDM subcarrier, adopt a kind of load mode of novelty.Specifically, consider that the frequency diversity gain that application cycle delay diversity technique acquisition on the one hand strengthens requires to load the adjacent data symbol to the subcarrier with weak correlation, application cycle delay diversity technique will cause the correlation between adjacent sub-carrier to die down on the other hand, and simple space-time/frequency block code detector requires to transmit a pair of two subcarriers according to space-time/frequency block code coded data symbol and has high correlation, therefore propose in the present embodiment: continuous data symbol is loaded on the weak subcarrier of correlation, simultaneously will be right according to space-time/frequency block code coded data symbol, be loaded on two strong subcarriers of correlation, rather than on two adjacent subcarriers.Here so-called correlation power is meant the size of two stochastic variables coefficient correlation statistically.Correlation by force still correlation weak to define for those skilled in the art be known.Such as, the coefficient correlation of two stochastic variables is 0.9, can think that these two stochastic variable correlations are strong, coefficient correlation is 0.1 then can think a little less than the correlation of these two stochastic variables.To describe this novel load mode below in detail.
At first clear and definite, by analyzing and calculating and determine, when (M is a positive integer arbitrarily at M for example, do not have particular restriction) carry out after application cycle postpones diversity technique between the sub-district of cooperative multipoint transmission, at interval two sub-intercarriers of M-1 have high correlation, and M continuous sub-carriers correlation each other all a little less than.Thus, when cell base station sends data by two transmit antennas, in the load operation in above-mentioned steps S 101, be unit with 2M continuous data symbol, every 2M continuous data symbol is loaded on 2M the continuous OFDM subcarrier.Specifically, when carrying out this loading, load in the following manner: M is wherein encoded according to space-time/frequency block code to the data symbol of interval M-1 for any described 2M continuous data symbol; To be loaded into the data symbol through the M of space-time/frequency block code coding with random order on the OFDM subcarrier of two transmit antennas of cell base station, wherein this M is carried on two OFDM subcarriers with subcarrier spacing M-1 the data symbol in the data symbol each.And when cell base station sends data by four transmit antennas, with similar in the single subdistrict emission diversity scheme in the foregoing LTE standard Rel-8 version, the a pair of transmitting antenna that takies earlier in the four transmit antennas carries out described loading, and after 2M continuous data symbol is loaded, switch to and take in this four transmit antennas another antenna is loaded.Load mode when each sends data with cell base station by two transmit antennas to the concrete load mode in the transmitting antenna is identical, does not repeat them here.Fig. 8 (a)-(f) shows when M sub-district participates in cooperative multipoint transmission, according to the method described above data symbol is loaded into the exemplary loading situation on the OFDM subcarrier.Need to prove, owing to be to be loaded into the data symbol through the M that space-time/frequency block code is encoded on the OFDM subcarrier of transmitting antenna of cell base station in the load operation of above-mentioned steps S101 with random order, therefore according to the loading sequence difference, will inevitably cause multiple different loading result.Fig. 8 (a)-8 (f) is just to the purpose of example and show wherein several representational loading situations, and is not to be intended to this load operation is limited.
Below with reference to Fig. 5 (a)-5 (d), participating in cooperative multipoint transmission with two sub-districts (M=2) is example, describes in detail according to the data transmission method for uplink of second embodiment of the invention data symbol is loaded into loading situation on the OFDM subcarrier.
When the single subdistrict base station sends data by two transmit antennas, be unit with 2M (promptly 4) continuous data symbol, data symbol is loaded on the continuous sub-carriers.Concrete, for example, for data symbol S 1-S 4, its two couple who comprises is spaced apart the data symbol of M-1=1, i.e. S1 and S3, and S2 and S4 encode according to space-time/frequency block code respectively.In the time will being loaded on the transmitting antenna according to these the two pairs of data symbols behind the space-time/frequency block code coding subsequently, can load according to sequencing arbitrarily, as long as guarantee that it is on two OFDM carrier waves of 1 that data symbol after each is to coding all is carried in subcarrier spacing.For instance, can load data symbol behind the coding earlier to S 1And S 3, reload data symbol behind the coding to S 2And S 4, that is to say, on antenna 1, S 1And S 3Be loaded on subcarrier 1 and 3 S 2And S 4Be loaded on subcarrier 2 and 4; On antenna 2, symbol
Figure B2009102265256D0000091
With
Figure B2009102265256D0000092
Be loaded on subcarrier 1 and 3 symbol
Figure B2009102265256D0000093
With Be loaded on subcarrier 2 and 4, shown in Fig. 5 (a).Certainly, also can load data symbol behind the coding earlier to S 2And S 4, reload data symbol behind the coding to S 1And S 3, like this, on antenna 1, S 2And S 4Be loaded on subcarrier 1 and 3 S 1And S 3Be loaded on subcarrier 2 and 4; On antenna 2, symbol
Figure B2009102265256D0000095
With
Figure B2009102265256D0000096
Be loaded on subcarrier 1 and 3 symbol
Figure B2009102265256D0000097
With
Figure B2009102265256D0000098
Be loaded on subcarrier 2 and 4, shown in Fig. 5 (b).On the other hand, when loading, the loading sequence of two data symbols of a data symbol centering also is arbitrarily.For example, during to S1 and S3, can load S3 earlier and reload S1,, can load S4 earlier and reload S2 during at the loading data symbol equally S2 and S4 at the loading data symbol.That is to say that for the situation shown in Fig. 5 (a) and 5 (b), data symbol S1 behind the coding and the loading position of S3 can exchange, data symbol S2 behind the coding and the loading position of S4 also can exchange.
When the single subdistrict base station sends data by four transmit antennas, take antenna 1 and antenna 3 earlier and load 4 continuous data symbols, S1-S4 for example switches to then that to take another antenna right, be antenna 2 and antenna 4, load 4 continuous data symbol S subsequently 5-S 8, then switch to once more and take antenna 1 and antenna 3 carries out the loading of successive character, the rest may be inferred.Wherein per 4 continuous data symbols are loaded into two modes on the antenna and described above that S1-S4 is loaded into the mode of antenna 1 and antenna 2 is identical.Fig. 5 (c) illustration according to coded identification to (S1, S3), (S2, order S4) with S1-S4 be loaded into antenna 1 advance with 3 on, and according to coded identification to (S5, S7), (S6, order S8) is loaded into situation on antenna 2 and 4 with S5-S8.Shown in Fig. 5 (c), on antenna 1, S 1And S 3Be loaded on subcarrier 1 and 3 S 2And S 4Be loaded on subcarrier 2 and 4; On antenna 3, symbol With
Figure B2009102265256D0000102
Be loaded on subcarrier 1 and 3 symbol
Figure B2009102265256D0000103
With
Figure B2009102265256D0000104
Be loaded on subcarrier 2 and 4; On antenna 2, S 5Be loaded on subcarrier 5 and 7 S with S7 6And S 8Be loaded on subcarrier 6 and 8; On antenna 4, symbol
Figure B2009102265256D0000105
With Be loaded on subcarrier 5 and 7 symbol
Figure B2009102265256D0000107
With
Figure B2009102265256D0000108
Be loaded on subcarrier 6 and 8.Fig. 5 (d) illustration according to coded identification to (S2, S4), (S1, order S3) is loaded into S1-S4 on antenna 1 and 3, and according to coded identification to (S6, S8), (S5, order S7) is loaded into situation on antenna 2 and 4 with S5-S8.Shown in Fig. 5 (d), on antenna 1, S 2And S 4Be loaded on subcarrier 1 and 3 S 1And S 3Be loaded on subcarrier 2 and 4; On antenna 3, symbol
Figure B2009102265256D0000109
With
Figure B2009102265256D00001010
Be loaded on subcarrier 1 and 3 symbol
Figure B2009102265256D00001011
With
Figure B2009102265256D00001012
Be loaded on subcarrier 2 and 4; On antenna 2, S 6Be loaded on subcarrier 5 and 7 S with S8 5Be loaded on subcarrier 6 and 8 with S7; On antenna 4, symbol
Figure B2009102265256D00001013
With
Figure B2009102265256D00001014
Be loaded on subcarrier 5 and 7 symbol
Figure B2009102265256D00001015
With
Figure B2009102265256D00001016
Be loaded on subcarrier 6 and 8.Understand easily, Fig. 5 (c) and 5 (d) only illustration two kinds of possible loading situations, in fact, according to encoded data symbols to being loaded into the order difference on the antenna, also have various other loading situations.
Below explained the situation of single subdistrict respectively by two antennas or four antenna transmission data.In the present invention, participate in each sub-district of cooperative multipoint transmission and can be respectively send data by two or four antennas.
Fig. 6 (a)-(f) shows when three sub-districts (M=3) participate in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention the example that data symbol is loaded on the OFDM subcarrier is loaded situation.Concrete, Fig. 6 (a)-6 (c) shows respectively when the single subdistrict base station sends data by two transmit antennas, according to coded identification to (S1, S4), (S2, S5), (S3, order S6) with S1-S6 be loaded into situation on the antenna, according to coded identification to (S2, S5), (S3, S6), (S1, S4) order with S1-S6 be loaded on the antenna situation and according to coded identification to (S3, S6), (S1, S4), (S2, order S5) is loaded into situation on the antenna with S1-S6; Fig. 6 (d) shows when the single subdistrict base station sends data by four transmit antennas, according to coded identification to (S1, S4), (S2, S5), (S3, order S6) is loaded into S1-S6 on antenna 1 and 3, and according to coded identification to (S7, S10), (S8, S11), (S9, order S12) is loaded into situation on antenna 2 and 4 with S7-S12; Fig. 6 (e) shows when the single subdistrict base station sends data by four transmit antennas, according to coded identification to (S2, S5), (S3, S6), (S1, order S4) is loaded into S1-S6 on antenna 1 and 3, and according to coded identification to (S8, S11), (S9, S12), (S7, order S10) is loaded into situation on antenna 2 and 4 with S7-S12; Fig. 6 (f) shows when the single subdistrict base station sends data by four transmit antennas, according to coded identification to (S3, S6), (S1, S4), (S2, order S5) is loaded into S1-S6 on antenna 1 and 3, and according to coded identification to (S9, S12), (S7, S10), (S8, order S11) is loaded into situation on antenna 2 and 4 with S7-S12.Understand easily, Fig. 6 (a)-6 (f) also only illustration several possible loading situations, in fact, corresponding to the coded data symbol to being loaded into the different order on the antenna, also have various other loading situations.
Fig. 7 (a) and 7 (b) show when four sub-districts (M=4) participate in cooperative multipoint transmission, according to the data transmission method for uplink of second embodiment of the invention data symbol are loaded into a kind of basic loading situation on the OFDM subcarrier, are not described in detail herein.
Need to prove in addition,, when data symbol being loaded on the OFDM subcarrier, should determine the least unit of scheduling of resource according to the number of cells M that participates in cooperative multipoint transmission according to the data transmission method for uplink of second embodiment of the invention.Specifically, when the number of cells that participates in cooperative multipoint transmission is 4 when following, can be with the least unit of a time RB as scheduling of resource; And when participating in the number of cells more (more than 4 or 4) of cooperative multipoint transmission, need a plurality of time RB be joined together as the least unit of scheduling of resource according to the number M of sub-district.For described a plurality of time are joined together as the least unit of scheduling of resource, consider and comprise 12 subcarriers in each time, and in the data transmission method for uplink of second embodiment, 2M continuous this transmission block of data symbol primordial is loaded on 2M the continuous sub-carriers, and therefore a kind of preferable methods is to determine the least unit of scheduling of resource by the frequency resource block size (12) and the least common multiple of basic transmission block (2M).For example, as shown in Figure 9, for M=4, promptly 4 sub-districts participate in the situation of cooperative multipoint transmission,, two time are joined together as the least unit of scheduling of resource (two time comprise 24 OFDM subcarriers altogether, and wherein 24 is 8 and 12 least common multiple); When M=5, (comprising 60 OFDM subcarriers) least unit that five time are joined together as scheduling of resource.Equally, when the number of the sub-district that participates in cooperative multipoint transmission for more for a long time, also can determine the least unit of scheduling of resource by this mode or other suitable modes.
More than describe data transmission method for uplink in detail according to second embodiment of the invention.After receiving the data that send according to this method, user terminal only needs the decoding order of slightly modified space-time/frequency block code, just can reuse simple space-time/frequency block code detector.Specifically, decoding unit at minimum, 2M data symbol on the just continuous 2M subcarrier, user terminal successively to M to decoding according to space-time/frequency block code coded data symbol, and to every pair during according to space-time/frequency block code coded data symbol decoding, utilization be the data on two subcarriers of M-1 of being separated by.In addition, user terminal is when carrying out decode operation, only need know that the number of cells that participates in the multipoint cooperative transmission gets final product, need not to know specifically be which sub-district has participated in the multipoint cooperative transmission, need not also to know that the number of transmit antennas of the cell base station that participates in cooperation transmission is 2 or 4.
(the 3rd embodiment)
Among the embodiment in front, the cyclic delay values of cyclic delay operation step in time domain and frequency domain realization passed through respectively And Δ i=(i-1) N/M determines.In fact, described cyclic delay values can have some other modification.For example, cyclic delay values can have initial retardation Δ 0, that is to say that cyclic delay values can be modified to respectively when time-frequency domain is realized
Figure B2009102265256D0000122
With
Δ i＝(i-1)N/M+Δ 0。On the other hand, initial retardation Δ 0Become in the time of in different OFDM frames can being, cyclic delay values can be modified to thus With
Δ i(t)=(i-1) N/M+ Δ t, can increase the time diversity gain like this.
(the 4th embodiment)
Method to user terminal to transmit data has been described among each embodiment of front when a plurality of sub-districts participate in cooperative multipoint transmission.In fact, when comprising a plurality of sector in the single subdistrict, the data transmission method for uplink of describing among the present invention first to the 3rd embodiment all can be implemented in a plurality of sectors.For example, according to first embodiment of the invention, adopt cooperative multipoint transmission mode to comprise by the sector in a plurality of sub-districts: in each sector, being loaded on the OFDM subcarrier via the data symbol of transmitting antenna transmission coded system according to space-time/frequency block code to the method for user terminal to transmit data; Between the corresponding transmitting antenna of each sector, the data symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; According to cooperative multipoint transmission mode, the data symbol after the cyclic delay operation of described many sectors is sent to user terminal simultaneously.
On the other hand, when adopting many antenna transmission data in the single subdistrict, antenna can be divided into groups, and be unit participation cooperative multipoint transmission with the antenna sets.Thereby the method that a plurality of antenna sets are described in can each embodiment of application of aforementioned is to user terminal to transmit data.
(the 5th embodiment)
In aforementioned each embodiment of the present invention, postpone diversity technique by application cycle between the corresponding transmitting antenna of a plurality of cell base stations that participate in cooperative multipoint transmission, can obtain the frequency diversity gain of the enhancing of equivalence.The scheme that this application cycle between the respective antenna of many sub-districts postpones diversity technique can be applied to the multimedia broadcasting single frequency network, as shown in figure 10.Because for existing multimedia broadcasting single frequency network, no matter whether relate to many antennas, portable terminal does not need to know has send signal to it simultaneously for what cell base stations, therefore when the scheme that application cycle postpones diversity technique between the respective antenna in many sub-districts is generalized to the multimedia broadcasting single frequency network, need participate in the number of the sub-district that multipoint cooperative transmits to the portable terminal group notice of MBMS service.This can come to participate in to portable terminal group notice the number of the sub-district of multipoint cooperative transmission by increase an extra control signaling on physical layer Multicast Channel PMCH.
Below the data transmission method for uplink of cooperative multipoint transmission mode of the present invention is described, will wireless communication system that use this data transmission method for uplink be described below by a plurality of embodiment.Figure 12 is the diagram of application according to relevant device in the wireless communication system of the data transmission method for uplink of the embodiment of the invention.As previously mentioned, include a plurality of sub-districts in this wireless communication system, the base station of a plurality of sub-districts adopts cooperative multipoint transmission mode to user terminal to transmit data.
As shown in figure 12, each cell base station 1000 in the wireless communication system comprises symbol loading component 1100, is used for data symbol is loaded into the OFDM subcarrier according to the coded system of space-time/frequency block code; Cyclic delay operation parts 1200 are used for the transmitting antenna at cell base station, and the data symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; Transmit block 1300 is used for according to cooperative multipoint transmission mode, and the data symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.User terminal 2000 in the wireless communication system comprises receiving-member 2100, is used to receive the data symbol from each cell base station; Space-time/frequency block code detection part 2200 is used for decoding according to space-time/frequency block code coded data symbol.
A plurality of sub-districts, a plurality of sector have been described hereinbefore and in the multimedia broadcasting single frequency network with cooperative multipoint transmission mode to the method for user terminal to transmit data symbol and use the wireless communication system of this method.In fact this sending method and wireless communication system are equally applicable to the transmission to reference symbol.In the reference symbol delivery plan that adopts cooperative multipoint transmission mode, utilize the coding load mode identical that reference symbol is carried out identical processing with the data symbol send mode, can guarantee that channel estimating carries out accurately, thereby guarantee the performance of whole communication system.
Above-mentioned each embodiment among the application only describes for exemplary, their concrete structure and operation are not construed as limiting scope of the present invention, those skilled in the art can reconfigure different piece and the operation among above-mentioned each embodiment, produce new execution mode, same design according to the invention.
Embodiments of the invention can by hardware, software, firmware or between them the mode of combination realize that its implementation is not construed as limiting scope of the present invention.
Each function element (unit) annexation each other in the embodiment of the invention is not construed as limiting scope of the present invention, and one or more function element can comprise or be connected in other function element arbitrarily.
Though illustrated and described some embodiments of the present invention above in conjunction with the accompanying drawings, but those skilled in the art is to be understood that, under the situation that does not depart from principle of the present invention and spirit, can change and revise these embodiment, but they still drop within the scope of claim of the present invention and equivalent thereof.

Claims (20)

1. one kind is used for adopting the method for cooperative multipoint transmission mode to user terminal transmission symbol at wireless communication system by the base station of a plurality of sub-districts, comprising:
In each cell base station, the coded system of the symbol that will send via transmitting antenna according to space-time/frequency block code is loaded on the OFDM subcarrier;
Between the corresponding transmitting antenna of each cell base station, the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation;
According to cooperative multipoint transmission mode, the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.
2. the method for claim 1, wherein said symbol is loaded on the OFDM subcarrier according to the coded system of space-time/frequency block code further comprises: continuous symbol is loaded on the weak OFDM subcarrier of correlation, simultaneously will be right according to the symbol of space-time/frequency block code coding, be loaded on two strong OFDM subcarriers of correlation.
3. method as claimed in claim 2, when cell base station sends symbol by two transmit antennas, described symbol is loaded on the OFDM subcarrier according to the coded system of space-time/frequency block code comprises: with 2M continuous symbol is unit, in the following manner every 2M continuous symbol is loaded on 2M the continuous OFDM subcarrier, wherein M is the number of described a plurality of sub-districts:
For any described 2M continuous symbol, wherein M is encoded according to space-time/frequency block code to the symbol of interval M-1;
To symbol be loaded on the OFDM subcarrier of described two transmit antennas through the described M of space-time/frequency block code coding with random order, wherein this M is carried on two OFDM subcarriers with subcarrier spacing M-1 symbol in the symbol each.
4. method as claimed in claim 2, when cell base station sends symbol by four transmit antennas, described symbol is loaded on the OFDM subcarrier according to the coded system of space-time/frequency block code comprises: any a pair of transmitting antenna that takies in the described four transmit antennas carries out described loading, and after 2M continuous symbol loaded, switch to and take in this four transmit antennas another antenna is carried out described loading, wherein M is the number of described a plurality of sub-districts.
5. method as claimed in claim 4 wherein takies any a pair of transmitting antenna in the described four transmit antennas and carries out described loading and further comprise in the following manner 2M continuous symbol is loaded on 2M the continuous OFDM subcarrier:
M in this 2M the continuous symbol is encoded according to space-time/frequency block code to the symbol of interval M-1;
To symbol be loaded on this OFDM subcarrier to transmitting antenna through the described M of space-time/frequency block code coding with random order, wherein this M is carried on two OFDM subcarriers with subcarrier spacing M-1 symbol in the symbol each.
6. as each described method among the claim 1-5, wherein in time domain, carry out described cyclic delay operation.
7. method as claimed in claim 6, described cyclic delay operation further comprises:
The symbol that is loaded into each OFDM subcarrier is carried out invert fast fourier transformation;
In each cell base station, the symbol after the invert fast fourier transformation is carried out circulation delay according to the predetermined cyclic delay values corresponding with this cell base station;
Symbol behind circulation delay adds Cyclic Prefix.
8. method as claimed in claim 7, wherein corresponding with cell base station described predetermined cyclic delay values is
Figure F2009102265256C0000021
I=1,2 ..., M, wherein M is the number of described a plurality of sub-districts, and N is counting of described invert fast fourier transformation, and i is the sign of sub-district.
9. method as claimed in claim 7, wherein corresponding with cell base station described predetermined cyclic delay values is I=1,2 ..., M, wherein M is the number of described a plurality of sub-districts, and N is counting of described invert fast fourier transformation operation, and i is the sign of sub-district, Δ 0Be predefined initial value.
10. as each described method among the claim 1-5, wherein in frequency domain, carry out described cyclic delay operation.
11. method as claimed in claim 10, described cyclic delay operation further comprises step:
In each cell base station, the symbol that is loaded into each OFDM subcarrier be multiply by the predetermined phase translocation factor of this cell base station;
The symbol that multiply by after the phase-shifts factor is carried out invert fast fourier transformation;
Symbol behind invert fast fourier transformation adds Cyclic Prefix.
12. method as claimed in claim 11, wherein the predetermined phase translocation factor that adopts on k subcarrier of each cell base station is
Figure F2009102265256C0000023
Cyclic delay values Δ wherein i=(i-1) N/M, i=1,2 ..., M, M are the number of described a plurality of sub-districts, and N is counting of described invert fast fourier transformation, and i is the sign of sub-district, and k is OFDM subcarrier sign.
13. method as claimed in claim 11, wherein the predetermined phase translocation factor that adopts on k subcarrier of each cell base station is
Figure F2009102265256C0000024
Cyclic delay values Δ wherein i=(i-1) N/M+ Δ 0, i=1,2 ..., M, M are the number of described a plurality of sub-districts, and N is counting of described invert fast fourier transformation, and i is the sign of sub-district, and k is OFDM subcarrier sign, Δ 0Be predefined initial value.
14. as claim 9 or 13 described methods, wherein said predefined initial value Δ 0Become when in different OFDM frames being.
15. as each the described method among the claim 2-5, wherein in the described step that symbol is loaded into according to the coded system of space-time/frequency block code on the OFDM subcarrier, determine the least unit of scheduling of resource according to the number of described a plurality of sub-districts.
16. as each the described method among the claim 1-5, wherein said a plurality of cell base stations and described user terminal form the multimedia broadcasting single frequency network.
17. method as claimed in claim 16 wherein in this multimedia broadcasting single frequency network, is notified to user terminal the number of described a plurality of sub-districts by an extra control signaling.
18. a wireless communication system, this system comprises a plurality of sub-districts, and the base station of described a plurality of sub-districts adopts cooperative multipoint transmission mode to send symbol to user terminal, wherein
Described base station comprises:
The symbol loading component is used for the symbol that will send via transmitting antenna is loaded into the OFDM subcarrier according to the coded system of space-time/frequency block code;
The cyclic delay operation parts are used for the transmitting antenna at cell base station, and the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; With
Transmit block is used for according to cooperative multipoint transmission mode, and the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna,
Described user terminal comprises:
Receiving-member is used to receive the symbol from each cell base station; With
The space-time/frequency block code detection part is used to the symbol of decoding and encoding according to space-time/frequency block code.
19. a cell base station that adopts cooperative multipoint transmission mode to user terminal transmission symbol in wireless communication system wherein comprises a plurality of described cell base stations in this wireless communication system, this cell base station comprises:
The symbol loading component is used for the symbol that will send via transmitting antenna is loaded into the OFDM subcarrier according to the coded system of space-time/frequency block code;
The cyclic delay operation parts are used for the transmitting antenna at cell base station, and the symbol that is loaded on the OFDM subcarrier is carried out cyclic delay operation; With
Transmit block is used for according to cooperative multipoint transmission mode, and the symbol after the cyclic delay operation is sent to user terminal via transmitting antenna.
20. cell base station as claimed in claim 19, wherein said symbol loading component is loaded into continuous symbol on the weak continuous OFDM subcarrier of correlation, simultaneously will be right according to the symbol of space-time/frequency block code coding, be loaded on two strong OFDM subcarriers of correlation.
CN2009102265256A 2009-11-20 2009-11-20 Wireless communication system as well as base station and symbol sending method thereof Pending CN102075301A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2009102265256A CN102075301A (en) 2009-11-20 2009-11-20 Wireless communication system as well as base station and symbol sending method thereof
PCT/CN2010/078928 WO2011060736A1 (en) 2009-11-20 2010-11-19 Wireless communication system, base station thereof, and symbol transmission method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009102265256A CN102075301A (en) 2009-11-20 2009-11-20 Wireless communication system as well as base station and symbol sending method thereof

Publications (1)

Publication Number Publication Date
CN102075301A true CN102075301A (en) 2011-05-25

Family

ID=44033658

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009102265256A Pending CN102075301A (en) 2009-11-20 2009-11-20 Wireless communication system as well as base station and symbol sending method thereof

Country Status (2)

Country Link
CN (1) CN102075301A (en)
WO (1) WO2011060736A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108886393A (en) * 2016-03-30 2018-11-23 高通股份有限公司 Beam reference signal for broadcasting decoder
CN110999101A (en) * 2017-07-28 2020-04-10 高通股份有限公司 Transmit diversity scheme for uplink sequence transmission

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9337973B2 (en) 2012-09-11 2016-05-10 Industrial Technology Research Institute Method of cooperative MIMO wireless communication and base station using the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI562572B (en) * 2006-01-11 2016-12-11 Interdigital Tech Corp Method and apparatus for implementing space time processing with unequal modulation and coding schemes
CN101039136B (en) * 2006-03-15 2011-09-14 华为技术有限公司 Space-frequency coding-based multi-antenna transmitter diversity method and system thereof
CN101296012B (en) * 2007-04-24 2013-06-05 中兴通讯股份有限公司 Method for pilot frequency insertion and diversity emission of space-frequency encoding cascade cycle detention diversity
US8160177B2 (en) * 2007-06-25 2012-04-17 Samsung Electronics Co., Ltd. Transmit methods with delay diversity and space-frequency diversity

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108886393A (en) * 2016-03-30 2018-11-23 高通股份有限公司 Beam reference signal for broadcasting decoder
CN108886393B (en) * 2016-03-30 2022-05-03 高通股份有限公司 Beam reference signal for broadcast decoding
CN110999101A (en) * 2017-07-28 2020-04-10 高通股份有限公司 Transmit diversity scheme for uplink sequence transmission
CN110999101B (en) * 2017-07-28 2022-04-12 高通股份有限公司 Transmit diversity scheme for uplink sequence transmission

Also Published As

Publication number Publication date
WO2011060736A1 (en) 2011-05-26

Similar Documents

Publication Publication Date Title
CN109314592B (en) Method and apparatus for measuring reference signals and synchronization
US11038561B2 (en) Method and apparatus for transmitting data
US9107213B2 (en) Reference signal for time and/or frequency tracking in a wireless network
CN102415176B (en) Method of signaling particular types of resource elements in wireless communication system
CN102812763B (en) Signaling and channel estimation for uplink transmit diversity
CN102771061B (en) Indicate the method and system of enable transmission block
CN110999187B (en) Method and apparatus for allocating phase tracking reference signals in a wireless communication system
EP3338419B1 (en) Methods and apparatuses for transmitting and receiving reference signals
CN101416465A (en) Method and arrangement in wireless communication networks using relaying
CN106664182A (en) Method for transmitting d2d signal of terminal in d2d communication, and device for same
CN104584452A (en) Reception of downline data for coordinated multi-point transmission in the event of fall-back
CN103975546A (en) Wireless base station device, wireless communication system, and wireless communication method
CN102684857A (en) Methods and systems for transmitting sfbc signals with csi-rs transmission and related muting in lte-advance systems
KR20100066261A (en) Reference signal transmission method for downlink multiple input multiple output system
CN113475009B (en) Method and apparatus for high rank CSI reporting in a wireless communication system
CN101826944B (en) Method and device for multi-node cooperative transmission
CN101146079A (en) OFDM sub-carrier allocation method based on generic algorithm
US20090262845A1 (en) Method for transmitting and receiving data using pilot structure
CN114828252A (en) Method and device for multi-transmission point data transmission
CN104168092A (en) Enhanced physical hybrid automatic repeat request indicator channel (ePHICH) transmission method and device
CN107294574B (en) Method and device for multi-transmission point data transmission
CN101185268B (en) Multiantenna communication apparatus and multiantenna communication system
CN109983742B (en) Apparatus and method for transmitting and receiving signal in wireless communication system
CN101394259B (en) Space time collaboration diversity method in OFDMA system
CN102075301A (en) Wireless communication system as well as base station and symbol sending method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20110525