CN101826944B - Method and device for multi-node cooperative transmission - Google Patents
Method and device for multi-node cooperative transmission Download PDFInfo
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Abstract
The invention discloses a method and a device for multi-node cooperative transmission. When the number of access nodes is larger than 2, the method comprises the following steps of: carrying out space-frequency block encoding on data to be transmitted to obtain data in two channels; and dividing the access nodes into two groups, wherein the access nodes in either group respectively transmits the data in one of the two channels. The invention improves the cooperative flexibility.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of coordinated multi-point transmission method and device.
Background technology
Along with senior Long Term Evolution (Long Term Evolution-Advance, referred to as LTE-A) proposition of demand, community average spectral efficiency (ase) and cell edge spectrum efficiency more and more come into one's own, wherein, cell edge spectrum efficiency is of greatest concern, its reason is that the up/down provisional capital of LTE-A system is with OFDM (Orthogonal Frequency-DivisionMultiplexing, referred to as OFDM) be the frequency division systems of basic multiple access multiplexing mode, with traditional with code division multiple access (Code Division Multiple Access, referred to as CDMA) be the wireless communication system difference of basic multiple access multiplexing mode, LTE-A system does not have processing gain, inside, community is due to complete frequency division quadrature, so almost there is no interference problem, but the interference processing at cell edge place has to be solved.
At present, the processing of in LTE, cell edge place being disturbed mainly contains following three kinds of methods: (1) interference randomization; (2) disturb and eliminate; (3) interference coordination (hiding).At these three kinds, disturb in processing method, or cannot effectively eliminate interference, or cannot utilize fully resource.Therefore, utilize the transmitting antenna cooperation transmission of a plurality of communities to realize the higher capacity of cell edge place wireless link and the coordinated multipoint transmission of transmitting (CoordinatedMultiple Point Transmission and Reception, referred to as CoMP) technology becomes research emphasis.
Fig. 1 is according to the schematic diagram of the basic principle of the CoMP of correlation technique, as shown in Figure 1, subscriber equipment (User Equipment, referred to as UE) 1 is positioned at the edge of community (Cell) #1, Cell#2, Cell#3, UE2 is positioned at Cell#1, and UE3 is positioned at Cell#3.
Fig. 2 is according to the schematic diagram of the basic structure of the multi-point joint transmission of correlation technique, as shown in Figure 2, the data of Cell 1 and 2 pairs of inputs of Cell are mapped to access node by weight vector F1, F2 respectively and launch through processing (Preprocessing).
At third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) in 53bis meeting, CoMP is joined in basic framework, in 3GPP54～3GPP 55bis meeting, the delivery plan of a series of CoMP has been proposed, in these schemes, majority is all that the channel information based on desirable is considered.The CoMP emission diversity scheme based on irrelevant transmission existing at present mainly comprises:
Fig. 3 is single frequency network (the Single Frequency Network according to correlation technique, referred to as SFN) schematic diagram of-CoMP transmission diversity method, as shown in Figure 3, in SFN-CoMP, the data of same format are transmitted respectively in different communities, and merge by eating dishes without rice or wine; That is, the data of Cell 1 and 2 pairs of inputs of Cell are mapped to access node transmitting antenna by weight vector F1, F2 respectively and launch.
Fig. 4 is Cyclic Delay Diversity (the Cyclic Delay Diversity according to correlation technique, referred to as CDD) schematic diagram of-CoMP transmission diversity method, as shown in Figure 4, CDD-CoMP: similar with SFN-CoMP, the data that each cell transmission is identical, difference is that the data of different districts transmission carry out different cycle time-delays; That is, Cell 1 and Cell2 are mapped to access node by weight vector F1, F2 respectively to the data of input and launch, and wherein, the data of 2 pairs of transmission of Cell have been carried out cycle time-delay, at frequency domain, are multiplied by cycle phase factor e
j2 π Δ fk τ, wherein, k is the index of subcarrier in frequency domain, and Δ f is the carrier spacing, and τ is corresponding to cycle time-delay amount.
Fig. 5 is Space Frequency Block Coding (the Space Frequency BlockCode according to correlation technique, referred to as SFBC) schematic diagram of-CoMP transmission diversity method, as shown in Figure 5, in SFBC-CoMP, the data of different districts transmission form SFBC coded format, the data of a branch road of each cell transmission SFBC coding.
Particularly, data s
1s
2first through SFBC coding, process, obtain two paths of data, suppose that the two paths of data form obtaining is s
1s
2 *and s
2-s
1 *(can be also other SFBC coding forms).Cell 1 is for transmitting the first via s of SFBC coding output
1s
2*, Cell 2 is for transmitting the second circuit-switched data s of SFBC coding output
2-s
1 *.Then, 2 circuit-switched data of output being mapped to each access node transmitting antenna by weight vector F1, F2 respectively launches.
Simulation result shows, based on SFBC-CoMP scheme, can obtain best effect, but because SFBC only exists two-way, that is, can only process the cooperation transmission of Liang Ge community, for example, situation for 3 or more cell cooperative joint transmission, SFBC cannot directly process, and therefore, has limited the flexibility of cooperation.
Summary of the invention
For correlation technique, limited the problem of the flexibility cooperating and proposed the present invention, for this reason, main purpose of the present invention is to provide a kind of coordinated multipoint transmission diversity scheme based on SFBC, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of coordinated multi-point transmission method.
According to coordinated multi-point transmission method of the present invention, when the number of access node is greater than 2, the method comprises: data waiting for transmission are carried out to Space Frequency Block Coding, obtain two paths of data; Access node is divided into two groups, the circuit-switched data in the access node difference transmitting two paths data in each group.
Preferably, a circuit-switched data in access node transmitting two paths data in each group comprises: for each access node in each group, in time domain, respectively a circuit-switched data waiting for transmission is carried out to different Cyclic Delay Diversity, and transmit the circuit-switched data after Cyclic Delay Diversity.
Preferably, a circuit-switched data in access node transmitting two paths data in each group comprises: for each access node in each group, at frequency domain, respectively a circuit-switched data waiting for transmission is multiplied by the circuit-switched data after the different cycle phase factors is processed, and the circuit-switched data after transmission process.
Preferably, the circuit-switched data in the access node transmitting two paths data in each group comprises: each access node in each group transmits an identical circuit-switched data.
Preferably, the circuit-switched data in the access node transmitting two paths data in each group comprises: in different time slots, subframe or radio frames, select an access node to transmit a circuit-switched data corresponding to this group in each group.
Preferably, when access node exists many antennas, the data of this access node transmission are weighted by wave beam weight, so that data-mapping transmits to many transmit antennas.
Preferably, the corresponding same antenna port of each access node in each group.
Preferably, access node comprise following one of at least: community, base station, relay station, Home eNodeB.
To achieve these goals, according to another aspect of the present invention, provide a kind of coordinated multipoint transmission device.
Coordinated multipoint transmission device according to the present invention comprises: coding module, for data waiting for transmission are carried out to Space Frequency Block Coding, obtains two paths of data; Grouping module, for being divided into two groups by least three access nodes of transmission data; Control module, for a circuit-switched data of every group of access node difference transmitting two paths data after the grouping of control packet module.
Preferably, control module comprises: diversity submodule, for respectively a circuit-switched data waiting for transmission being carried out to different Cyclic Delay Diversity in time domain; Process submodule, for respectively a circuit-switched data waiting for transmission being multiplied by the circuit-switched data after the different cycle phase factors is processed at frequency domain; Chooser module for the time slot different, subframe or radio frames, selects an access node to transmit a circuit-switched data corresponding to this group in each group.
By the present invention, adopt access node is divided into two groups, the circuit-switched data in the access node transmitting two paths data in each group, has solved correlation technique and has limited the problem of the flexibility of cooperation, and then improved the flexibility of cooperation.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the basic principle of the CoMP of correlation technique;
Fig. 2 is according to the schematic diagram of the basic structure of the multi-point joint transmission of correlation technique;
Fig. 3 is according to the schematic diagram of the SFN-CoMP transmission diversity method of correlation technique;
Fig. 4 is according to the schematic diagram of the CDD-CoMP transmission diversity method of correlation technique;
Fig. 5 is according to the schematic diagram of the SFBC-CoMP transmission diversity method of correlation technique;
Fig. 6 is the flow chart of the coordinated multi-point transmission method of example according to the present invention;
Fig. 7 is the schematic diagram of the SFBC-BF-CDD CoMP transmission diversity method of the example one according to the present invention;
Fig. 8 is the schematic diagram of the SFBC-BF-SFN CoMP transmission diversity method of the example two according to the present invention;
Fig. 9 is the schematic diagram of the SFBC-BF-TSTD CoMP transmission diversity method of the example three according to the present invention;
Figure 10 is the structured flowchart of the coordinated multipoint transmission device of the example according to the present invention;
Figure 11 is the concrete structure block diagram of the coordinated multipoint transmission device of the example according to the present invention.
Embodiment
Functional overview
Consider that correlation technique has limited the problem of the flexibility of cooperation, based on SFBC-CoMP, need two-way pilot tone to distinguish the two paths of data of SFBC, the embodiment of the present invention provides the diversity scheme of the coordinated multipoint transmission based on SFBC, employing is divided into two groups by access node, a circuit-switched data in access node transmitting two paths data in each group, can solve the flexibility problem of the CoMP transmission based on SFBC.
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Embodiment of the method
According to embodiments of the invention, a kind of coordinated multi-point transmission method is provided, the method is mainly used in the situation that the number of access node is greater than 2, and the access node is here used to subscriber equipment that service is provided.
Fig. 6 is the flow chart of the coordinated multi-point transmission method of example according to the present invention, and as shown in Figure 6, the method comprises that following step S602 is to step S604:
Step S602, carries out SFBC to data waiting for transmission, obtains two paths of data.
Step S604, is divided into two groups by access node, the circuit-switched data in the access node difference transmitting two paths data in each group.Wherein, the access node here can comprise following one of at least: community, base station, relay station, Home eNodeB.
Particularly, step S604 can realize by following several modes:
Mode one: by Space Frequency Block Coding (SFBC) and beam weighting (Beam Forming, referred to as BF) and Cyclic Delay Diversity (CDD) co-design.
Particularly, for each access node in each group, in time domain, respectively a circuit-switched data waiting for transmission is carried out to different Cyclic Delay Diversity (CDD), and transmit the circuit-switched data after Cyclic Delay Diversity; Or at frequency domain, a circuit-switched data waiting for transmission is multiplied by the circuit-switched data after the different cycle phase factors is processed, and the circuit-switched data after transmission process, so that the effect of acquisition and CDD equivalence.
Mode two: Space Frequency Block Coding (SFBC) is merged to co-design with beam weighting (BF) and SFN.That is to say, each access node in each group transmits an identical circuit-switched data,, the circuit-switched data that this group is corresponding copies, number of copies is the number of access node in community, and at each access node, send this circuit-switched data respectively, then, the mode that recipient merges with SFN receives two paths of data.
Mode three: Space Frequency Block Coding (SFBC) and beam weighting (BF) and time-switching transmit diversity (Time Switch Transmit Diversity, referred to as TSTD) are merged to co-design.That is to say, in different time slots, subframe or radio frames, in each group, select an access node to transmit a circuit-switched data corresponding to this group, for example, for the integral multiple of time slot, subframe or radio frames, the mode of switching with access node in each group selects an access node to transmit a circuit-switched data corresponding to this group.
For three kinds of above-mentioned implementations, when access node exists many antennas, the data of this access node transmission are weighted by wave beam weight, so that data-mapping transmits to many transmit antennas.
It should be noted that, in 2 access node groups, every group while having a plurality of access node, each group can be selected the processing mode described in above-mentioned three kinds of modes independently.
In addition, the corresponding same antenna port of each access node in each group, that is to say, corresponding pilot tone pattern is identical with pilot frequency sequence.
By this embodiment, the above-mentioned three kinds of modes that provide can solve the existing limited flexibility problem of SFBC-CoMP.For the CoMP emission diversity method of SFBC+BF+CDD, can increase further frequency diversity gain by CDD; And the method for SFBC+BF+SFN merges by SFN, can obtain further SFN transmission gain; The CoMP diversity transmission method of SFBC+BF, although cannot obtain CDD diversity gain or the SFN gain of above-mentioned two kinds of methods, but switch by TSTD, can obtain space diversity transmission gain, simultaneously, owing to participating in the number of cells of transmission data, reduce, can reduce the interference problem of community between system-level different cooperations territory.
Below in conjunction with example, the implementation procedure of the embodiment of the present invention is described in detail.
Example one
In this example, employing be the CoMP transmission diversity method of SFBC+BF+CDD, corresponding to above-mentioned mode one.
Fig. 7 is the schematic diagram of the SFBC-BF-CDD CoMP transmission diversity method of the example one according to the present invention, as shown in Figure 7, in the transmission diversity structure that SFBC, the BF that is 3 and CDD combine use, comprises following processing at the access node number that participates in joint transmission:
Data s
1s
2first through SFBC coding, process, obtain two paths of data, suppose that the two paths of data form obtaining is s
1s
2 *and s
2-s
1 *(can be also other SFBC coding forms).
Owing to participating in the number of the access node of joint transmission, be greater than 2, therefore, access node divided into groups.3 access nodes (Cell 1, Cell 2, Cell 3) have been shown in Fig. 7, Cell 1 has been divided into the 1st group, for transmitting the first via s of SFBC coding output
1s
2 *, Cell 2 and Cell 3 are divided into the 2nd group, for transmitting the second circuit-switched data s of SFBC coding output
2-s
1 *.
A plurality of different access node in same group, carries out different circulations to data and delays.In Fig. 7, the data of Cell 2 and Cell 3 transmission are all s
2-s
1 *, still, the data of Cell3 transmission are to s
2-s
1 *carry out cycle time-delay, at frequency domain, be multiplied by cycle phase factor e
j2 π Δ fk τ, wherein, k is the index of subcarrier in frequency domain, and Δ f is the carrier spacing, and τ is corresponding to cycle time-delay amount.This embodiment is multiplied by by frequency domain the cyclic shift effect that the cycle phase factor produces time domain.
Then, 3 circuit-switched data of output are mapped on many transmit antennas of each access node by weight vector F1, F2, F3 respectively.
Now, Cell 2 and the identical pilot tone in the corresponding road of Cell 3, the corresponding other road pilot tone of Cell 1.That is, Cell 2 and Cell 3 launch at same antenna port, and Cell 1 launches at another one antenna port.The data of Cell 2 and Cell 3 transmittings are after space merges, and what recipient, identify is a circuit-switched data corresponding to same antenna port.
The CoMP emission diversity method for SFBC+BF+CDD providing by this example, can increase frequency diversity gain further by CDD.
Example two
In this example, employing be the CoMP transmission diversity method of SFBC+BF+SFN, corresponding to above-mentioned mode two.
Fig. 8 is the schematic diagram of the SFBC-BF-SFN CoMP transmission diversity method of the example two according to the present invention, as shown in Figure 8, in the transmission diversity structure that SFBC, the BF that is 3 at the access node number that participates in joint transmission and SFN combine use, the method and the method in example one that adopt are similar, its difference is only a plurality of different access node in same group, data are not carried out to cycle time-delay, but directly transmit identical data.That is to say, the data of Cell2 and Cell3 transmission are all s
2-s
1 *, still, the data of Cell3 transmission are not to s
2-s
1 *carried out cycle time-delay, other processing is all identical with example one, does not repeat them here.
The SFBC+BF+SFN method providing by this example, merges by SFN, can obtain further SFN transmission gain.
Example three
In this example, employing be the CoMP transmission diversity method of SFBC+BF+TSTD, corresponding to above-mentioned mode three.
Fig. 9 is the schematic diagram of the SFBC-BF-TSTD CoMP transmission diversity method of the example three according to the present invention, as shown in Figure 9, and data s
1s
2first through SFBC coding, process, obtain two paths of data s
1s
2 *and s
2-s
1 *(can be also other SFBC coding forms).The community that participates in joint transmission is divided into two groups equally, and using Cell 1, separately as one group, Cell 2 and Cell 3, as other one group, distinguish transmitting two paths data s
1s
2 *and s
2-s
1 *; The number of community and the inconsistent flexibility problem bringing of data way of SFBC coding output for fear of participating in cooperation, switch at different time-gap the different districts in same group.In Fig. 8, Cell 2 and Cell 3 belong to same group, and Liang Ge community sends a circuit-switched data s of SFBC coding by the mode of switching
2-s
1 *, wherein, the granularity of switching is with time slot or subframe or Zheng Wei unit.
Then, 3 circuit-switched data of output are mapped on many transmit antennas of each access node by weight vector F1, F2, F3 respectively.
Now, Cell 2 and the identical pilot tone in the corresponding road of Cell 3, the corresponding other road pilot tone of Cell 1.That is, Cell 2 and Cell 3 launch at same antenna port, and Cell 1 launches at another one antenna port.The data of Cell 2 and Cell 3 transmittings are after space merges, and what recipient, identify is a circuit-switched data corresponding to same antenna port.
By this embodiment, the SFBC+BF+TSTD method providing, switches by TSTD, can obtain space diversity transmission gain,, owing to participating in the number of cells of transmission data, reduces meanwhile, can reduce the interference problem of community between system-level different cooperations territory.
Device embodiment
According to embodiments of the invention, a kind of coordinated multipoint transmission device is provided, this device can be for realizing above-mentioned coordinated multi-point transmission method.Figure 10 is the structured flowchart of the coordinated multipoint transmission device of the example according to the present invention, and as shown in figure 10, this device comprises: coding module 2, grouping module 4, control module 6, be described said structure below.
Coding module 2, for data waiting for transmission are carried out to Space Frequency Block Coding, obtains two paths of data; Grouping module 4, for being divided into two groups by least three access nodes of transmission data; Control module 6, is connected to coding module 2 and grouping module 4, a circuit-switched data of the two paths of data obtaining for every group of access node transfer encoding module respectively 2 codings after 4 groupings of control packet module.
Figure 11 is the concrete structure block diagram of the coordinated multipoint transmission device of the example according to the present invention, and as shown in figure 11, control module 6 comprises: diversity submodule 62, processing submodule 64, chooser module 66, be described said structure below.
Diversity submodule 62, for carrying out different Cyclic Delay Diversity to a circuit-switched data waiting for transmission respectively in time domain; Process submodule 64, for respectively a circuit-switched data waiting for transmission being multiplied by the circuit-switched data after the different cycle phase factors is processed at frequency domain; Chooser module 66 for the time slot different, subframe or radio frames, selects an access node to transmit a circuit-switched data corresponding to this group in each group.
Particularly, the operation of control module 6 can realize by following several modes:
Mode one: by Space Frequency Block Coding (SFBC) and beam weighting (BF) and Cyclic Delay Diversity (CDD) co-design.
Particularly, for each access node in each group, diversity submodule 62 carries out different Cyclic Delay Diversity (CDD) to a circuit-switched data waiting for transmission respectively in time domain, and transmits the circuit-switched data after Cyclic Delay Diversity; Or process submodule 64, at frequency domain, a circuit-switched data waiting for transmission is multiplied by the circuit-switched data after the different cycle phase factors is processed, and the circuit-switched data after transmission process, so that the effect of acquisition and CDD equivalence.
Mode two: Space Frequency Block Coding (SFBC) is merged to co-design with beam weighting (BF) and SFN.That is to say, each access node in each group transmits an identical circuit-switched data, and the mode that recipient merges with SFN receives two paths of data.
Mode three: Space Frequency Block Coding (SFBC) and beam weighting (BF) and time-switching transmit diversity (Time Switch Transmit Diversity, referred to as TSTD) are merged to co-design.That is to say, in different time slots, subframe or radio frames, chooser module 66 selects an access node to transmit a circuit-switched data corresponding to this group in each group.
For three kinds of above-mentioned implementations, when access node exists many antennas, the data of this access node transmission are weighted by wave beam weight, so that data-mapping transmits to many transmit antennas.
It should be noted that, in 2 access node groups, every group while having a plurality of access node, each group can be selected the processing mode described in above-mentioned three kinds of modes independently.
In addition, the corresponding same antenna port of each access node in each group, that is to say, corresponding pilot tone pattern is identical with pilot frequency sequence.
In sum, by the above embodiment of the present invention, access node is divided into two groups, the circuit-switched data in the access node transmitting two paths data in each group, the above-mentioned three kinds of modes that wherein provide can solve the existing limited flexibility problem of SFBC-CoMP; For the CoMP emission diversity method of SFBC+BF+CDD, can increase further frequency diversity gain by CDD; And the method for SFBC+BF+SFN merges by SFN, can obtain further SFN transmission gain; The CoMP diversity transmission method of SFBC+BF, although cannot obtain CDD diversity gain or the SFN gain of above-mentioned two kinds of methods, but switch by TSTD, can obtain space diversity transmission gain, simultaneously, owing to participating in the number of cells of transmission data, reduce, can reduce the interference problem of community between system-level different cooperations territory.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a coordinated multi-point transmission method, is characterized in that, when the number of access node is greater than 2, described method comprises:
Data waiting for transmission are carried out to Space Frequency Block Coding, obtain two paths of data;
Described access node is divided into two groups, and the access node in each group transmits respectively the circuit-switched data in described two paths of data;
When access node exists many antennas, the data of this access node transmission are weighted by wave beam weight, so that described data-mapping transmits to many transmit antennas;
Wherein, the circuit-switched data that the access node in described each group transmits in described two paths of data comprises:
For each access node in each group, in time domain, respectively a described circuit-switched data waiting for transmission is carried out to different Cyclic Delay Diversity, and transmit the described circuit-switched data after Cyclic Delay Diversity; Or
For each access node in each group, the described circuit-switched data after frequency domain is multiplied by the different cycle phase factors to a described circuit-switched data waiting for transmission respectively and is processed, and the described circuit-switched data after transmission process; Or
In different time slots, subframe or radio frames, in each group, select an access node to transmit a described circuit-switched data corresponding to this group.
2. method according to claim 1, is characterized in that, the circuit-switched data that the access node in described each group transmits in described two paths of data comprises:
Each access node in each group transmits an identical described circuit-switched data.
3. according to the method described in any one in claim 1 to 2, it is characterized in that the corresponding same antenna port of each access node in each group.
4. according to the method described in any one in claim 1 to 2, it is characterized in that, described access node comprise following one of at least:
Community, base station, relay station, Home eNodeB.
5. a coordinated multipoint transmission device, is characterized in that, comprising:
Coding module, for data waiting for transmission are carried out to Space Frequency Block Coding, obtains two paths of data;
Grouping module, for being divided into two groups by least three access nodes of the described data of transmission;
Control module, transmits respectively a circuit-switched data of described two paths of data for controlling every group of access node after the grouping of described grouping module;
Wherein, when access node exists many antennas, described control module is weighted by wave beam weight the data of this access node transmission, so that described data-mapping transmits to many transmit antennas;
Wherein, described control module comprises:
Diversity submodule, for carrying out different Cyclic Delay Diversity to a described circuit-switched data waiting for transmission respectively in time domain;
Process submodule, for the described circuit-switched data after respectively a described circuit-switched data waiting for transmission being multiplied by the different cycle phase factors at frequency domain and being processed;
Chooser module for the time slot different, subframe or radio frames, selects an access node to transmit a described circuit-switched data corresponding to this group in each group.
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| CN103001888B (en) * | 2012-11-23 | 2016-03-30 | 北京东土科技股份有限公司 | A kind of transmission method of real time data and node device |
| EP2943012B1 (en) | 2013-01-28 | 2016-11-09 | Huawei Technologies Co., Ltd. | Method for accessing wireless communication node, wireless communication node and system |
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| EP1755231A1 (en) * | 2005-08-18 | 2007-02-21 | Create-Net | Multiple input - multiple output wireless communication system |
| CN101296012A (en) * | 2007-04-24 | 2008-10-29 | 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 |
| CN101374036A (en) * | 2007-08-23 | 2009-02-25 | 中兴通讯股份有限公司 | Transmission diversity method and system for multi-input multi-output OFDM system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018210463A1 (en) * | 2017-05-19 | 2018-11-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Transmissions of blocks of data in distributed mimo systems |
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