CN101102296B - Method for realizing data flow multiplexing and multi-carrier communication system - Google Patents
Method for realizing data flow multiplexing and multi-carrier communication system Download PDFInfo
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Abstract
The key point of the invention is: the subcarriers correlated to same base node under the logical channel node allocated for the data to be transmitted by base station are discontinuously set in the entire sub-band under the physical frame; using said subcarriers to carry the data stream and to make data transmission. By the invention, the actual channel quality can make better fitting to the channel quality fed back during sub-band scheduling such that even if the user's data is transmitted in one base node, the user can also get better frequency diversity so as to improve the transmission performance of low rate users.
Description
Technical field
The present invention relates to the communications field, relate in particular to the multiplex technique of data flow.
Background technology
The multi-carrier transmission technology is that data flow is decomposed into several independently sub data flows, make each sub data flow have lower bit rate, the low rate multimode symbol that uses described low bit rate to form then removes to modulate corresponding subcarrier, constitutes the parallel a plurality of low rate symbols that send.In the last few years, got more and more people's extensive concerning for the multi-carrier transmission technology of representative with OFDM (Orthogonal Frequency Division Multiplexing, OFDM).OFDM is divided into many subcarriers with frequency spectrum, and each subcarrier is modulated with lower data rate.By distributing different subcarriers, can realize OFDMA (Orthogonal Frequency Division Multi Access, orthogonal frequency division multiplexing multiple access inserts) to different users.Each narrow-band sub-carriers adopts different modulation systems, for example QAM (Quarduture Amplitude Modulation, 16-quadrature amplitude modulation), 64-QAM etc.
The OFDMA system will through the coding data to be transmitted as frequency domain information, it is modulated to time-domain signal, and, then carries out the inverse process demodulation at receiving terminal in channel.The modulation and demodulation of OFDMA system can be respectively by IDFT (Inverse Discrete Fourier Transform, against discrete Fourier transform (DFT)) and DFT (Discrete Fourier Transform, discrete Fourier transform (DFT)) replaces: at transmitting terminal, by N point IDFT computing, with the frequency domain data sign reversing is the time domain data symbol, through after the carrier modulation, send in the channel.At receiving terminal, received signal is carried out coherent demodulation, then baseband signal is carried out N point DFT computing, the data symbol that can obtain to send.In actual applications, IDFT/DFT adopts IFFT (Inverse Fast Fourier Transform, contrary fast fourier transform) and FFT (Fast Fourier Transform, fast fourier transform) to realize.The employing of FFT technology makes the complexity of OFDMA system reduce greatly, add the high-performance information processing device, such as PLD (programmable Logic Device, programmable logic device), DSP (Digital Signal Processor, digital signal processor), μ P (Micro Processor, microprocessor) etc. development and application make the realization of OFDMA system be more prone to.
When using ofdm system or OFDMA system transmissions data flow, need be with the multiplexing transmission simultaneously in a physical frame of a plurality of user's data streams.
The prior art relevant with the present invention provides a kind of method of utilizing data flow multiplexing technical transmission data flow, and its implementation procedure is as follows:
At first, different data streams to be sent is given according to the different logic channel node of user's information distribution such as sub-band channel quality in the base station.Handle by transmitter and receiver as shown in Figure 1 then: after at first data packets in data flows to be sent being carried out the coded/modulated processing by transmitter, obtain corresponding data symbol in physical layer; Then according to the logic channel node of base station assigns with on the subcarrier that resulting data symbol is modulated to base node under the described logic channel node is associated, that is to say, the data symbol that obtains is carried out multiplexing on the physical channel that is associated, make transmitter use the physical channel that is associated with base node under the described logic channel node to carry the packet of described data flow to be sent; Handle through multi-carrier modulation and then, go out by antenna transmission at last.
At receiving terminal, after the signal process multicarrier demodulation that antenna receives, extract the data symbol on the subcarrier that the base node under the channel node that described user is assigned to is associated again, then with the data symbol that extracts through symbol demodulation/decoding processing, recover packet at last.
The performance of carrying out multiplexing process in above-mentioned emission process on the physical channel that the data symbol with obtaining that comprises is being associated is as follows:
Transmitter will be used for the subcarrier of whole frequency band of system of transmits data packets and be divided into n subband, and wherein each subband is made up of Ns continuous sub-carriers.In each subband Ns subcarrier is divided into Ng group, each group is become by Nb=Ns/Ng sub carrier group.Suppose that a physical frame comprises Nf OFDM symbol.A continuous Nb subcarrier and Nf continuous OFDM symbol are formed a physical channel resources piece, comprise Ng physical channel resources piece in each subband, and label is 0 ..., Ng-1, then whole frequency band comprises n*Ng physical channel resources piece.
Logic channel adopts the structure of binary tree, and the root node of the superiors is represented the channel resource of whole frequency band.Each node has two child nodes.Orlop has n*Ng leaf node, is called base node (base node).The corresponding subband of subtree that has Nb base node in every binary tree.
Adopt the mode of frequency division multiplexing that the base node under the subtree is multiplexed in the subband corresponding with this subtree in the physical frame, be that a physical channel resources piece in each base node and this subband is associated, as can be seen from Figure 2, Fig. 2 first left base node is associated with physics channel resource block 0 (slash dash area) in first physical frame.In the different physical frames, each base node is associated with different physical channel resources piece in the corresponding subband of described base node.
By the technical scheme of prior art as can be seen, logic channel is being mapped in the process of physical channel, physical channel resources piece in each physical frame that each base node is mapped to is become by N continuous b sub carrier group, therefore too big variation can not take place in the channel quality of described physical channel resources piece within a coherence bandwidth, and subband is made up of a plurality of physical channel resources pieces, much larger than coherence bandwidth, the channel quality of each physical channel resources piece is inequality, if be that unit carries out frequency selective scheduling therefore with the subband, cause the quality of channel that the scheduled user feeds back and the actual channel quality of transfer of data to misfit easily, especially the transmission rate when user data is lower, when only needing physical channel resources piece transmission data, just more feasible is that the frequency selectivity dispatching method of unit can not make the user obtain the frequency selectivity gain with the subband.
Summary of the invention
The invention provides a kind of method and multi-carrier communications systems of data flow multiplexing, in order to solve exist in the prior art since the physical channel resources piece in each physical frame that each base node is mapped to become by N continuous b sub carrier group, and cause when the transmission rate of user data is hanged down, employing is that the method for the frequency selective scheduling of unit can not make the user obtain the problem of frequency selectivity gain with the subband.
The present invention realizes by the following technical solutions:
The invention provides a kind of method that realizes data flow multiplexing, it comprises:
The base station is divided into the N equal portions for the subcarrier that same base node under the logic channel node of user's distribution of flows to be sent is associated, and be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged in the different physical channel resources pieces in the whole subband under the physical frame discontinuously;
Carry described data flow and transmit based on described subcarrier.
Preferably, this method also comprises:
The sub-band channel quality information that the base station is measured according to the user distributes corresponding logic channel node to give described user data flow to be sent.
Preferably, when adopting different physical frame transmitting user data, physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged on process in the different physical channel resources pieces in the whole subband under the physical frame discontinuously, specifically comprises:
Physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously;
And in other physical frame, every one's share of expenses for a joint undertaking carrier wave is arranged on respectively in the different physical channel resources pieces in the whole subband under each physical frame discontinuously according to the frequency hopping mode;
Or,
Physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously;
And in other physical frame, with every one's share of expenses for a joint undertaking carrier wave be arranged on discontinuously with the first physical frame corresponding physical channel resource block in.
Preferably, this method also comprises:
Adopting the frequency division multiplexing mode is on the subcarrier in the different physical channel resources pieces in the same subband under the same physical frame that different base node are multiplexed into described base node is associated of different distribution of flows with the base station.
A kind of multi-carrier communications systems comprises transmitting terminal and receiving terminal, wherein:
Described transmitting terminal comprises the subcarrier map unit, be used for the base station is divided into the N equal portions for the subcarrier that the same base node under the logic channel node of user's distribution of flows to be sent is associated, and be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged on discontinuously in the different physical channel resources pieces in the whole subband under the physical frame;
And the data symbol that obtains after the coded modulation is modulated on the described subcarrier;
Wherein, described subcarrier map unit comprises grouped element and the unit is set;
Described grouped element is used for the base station is divided into the N equal portions for the subcarrier that each base node under the logic channel node of user's distribution of flows to be sent is associated;
The described unit that is provided with, the physical channel resources piece that is used for some is the interval, every one's share of expenses for a joint undertaking carrier wave that grouped element is divided uniformly-spaced is arranged in the different physical channel resources pieces in the whole subband under the physical frame discontinuously.
Preferably, when adopting a plurality of physical frames to transmit data, the described unit that is provided with comprises:
Second is provided with subelement, and the physical channel resources piece that is used for some is the interval, and the every one's share of expenses for a joint undertaking carrier wave that adopts the frequency hopping mode that described grouped element is divided uniformly-spaced is arranged under the different physical frames in the different Physical Resource Block in the whole subband discontinuously;
Or be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave that described grouped element is divided uniformly-spaced is arranged under the different physical frames in the corresponding physical Resource Block in the whole subband discontinuously.
Preferably, described subcarrier map unit also comprises:
Multiplexing Unit, being used for adopting the frequency division multiplexing mode is the subcarrier of the different physical channel resources pieces in the same subband under the same physical frame that different base node are multiplexed into described base node is associated of different distribution of flows with the base station.
By the concrete scheme of the invention described above as can be seen, the present invention brings following beneficial effect:
In the present invention, because the subcarrier that each base node is associated is discontinuously in whole subband, so the channel quality that feeds back when the actual channel quality of transfer of data and sub-band scheduling can coincide preferably, even user data only transmits on a base node like this, also can make the user obtain frequency diversity preferably, thereby can improve the transmission performance of low-rate users.
Description of drawings
The multi-carrier communications systems that Fig. 1 provides for background technology;
Base node that Fig. 2 provides for background technology and the graph of a relation between physical channel;
Fig. 3 is the flow chart of first embodiment provided by the invention;
Fig. 4 is the graph of a relation between base node and physical channel among first embodiment provided by the invention;
Fig. 5 is the graph of a relation between base node and physical channel among second embodiment provided by the invention
Fig. 6 is another graph of a relation between base node and physical channel among second embodiment provided by the invention;
Fig. 7 is the fundamental diagram of the 3rd embodiment provided by the invention;
Fig. 8 is for carrying out the simulation performance curve after the emulation to the technical scheme of the present invention and prior art.
Embodiment
First embodiment provided by the invention is a kind of method of data flow multiplexing, and it mainly is the situation at a physical frame carrying user data, and its implementation process specifically comprises the steps: as shown in Figure 3
The user measures the sub-band channel quality around it in real time or periodically, and the top-quality sub-band channel that will measure reports the base station, and described base station distributes corresponding logic channel node to be used to send data flow to be sent for described user according to the sub-band channel quality information of described reporting of user.
Base station assigns generally adopts the structure of binary tree for user's logic channel.The root node of the superiors is represented the channel resource of whole frequency band, and each node has two child nodes, and orlop has n*Ng leaf node, is called base node (base node).Corresponding subband of every stalk tree with Nb basic node.
In the step 2, at first with the base station for the subcarrier that each base node under the logic channel node of user's distribution of flows to be sent is associated is divided into the N equal portions, then every one's share of expenses for a joint undertaking carrier wave is arranged on discontinuously in the different physical channel resources pieces in the whole subband under the physical frame.When adopting a physical frame transmitting user data, be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different Physical Resource Block in the whole subband under the same physical frame discontinuously.Specific implementation process is as follows:
At first the subcarrier with whole frequency band is divided into n subband.Each subband is made up of Ns continuous sub-carriers.In each subband Ns subcarrier being graded is Ng*Na group, and each group is become by the individual sub carrier group of Nb=Ns/ (Ng*Na).If a physical frame comprises Nf OFDM symbol.A then continuous Nb subcarrier and Nf continuous OFDM symbol are formed a physical channel resources piece.Comprise Ng*Na physical channel resources piece in each subband, label is 0 ..., Ng*Na-1.Whole frequency band comprises n*Ng*Na physical channel resources piece.
By step 1 as can be seen, the corresponding subband of subtree that has Nb basic node.Na physical channel resources piece in the subband of each base node under the subtree and this subtree correspondence is associated like this.The physical channel resources piece that same base node is associated can serve as to be spacedly distributed in subband at interval with Ng-1 Resource Block.
Below in conjunction with Fig. 4, be that example is elaborated to step 2 with the wireless OFDM system:
If the band bandwidth of certain wireless OFDM system is 20MHz, comprise 2048 subcarriers, a physical frame comprises 8 OFDM symbols.It is 1.25MHz that the bandwidth of subband is selected according to the sub-band channel quality information of reporting of user in the base station, i.e. 128 subcarriers, and Ns is 128.As can be seen, the whole frequency band of system can be divided into 16 subbands, and promptly n gets 16.If the minimum particle size that physical channel resources is distributed is 16 (subcarrier) * 8 (OFDM symbol).Be that each base node is associated at each frame and 16 subcarriers, Ng is 16.If consider the effect of frequency diversity, get Na=4, then comprise 16*4 Physical Resource Block in each subband, label is 0 ..., 63.Each physical channel resources piece comprises b=Ns/ (Ng*Na)=4 continuous sub-carriers.Each base node and 4 physical channel resources pieces are associated like this.The physical channel resources piece that is associated with each base node is spacedly distributed on subband with the interval of 15 Resource Block.Such as, can get the physical channel resources piece relevant with the 1st base node number is 0,16,32,48, shown in slash dash area among the figure.The physical channel resources piece relevant with the 2nd base node number is 1,17,33,49 etc.Different base node adopts the mode of frequency division multiplexing in same physical frame.
Second embodiment provided by the invention.Be the method for another kind of data flow multiplexing, it has increased the description to the situation of the identical data flow of a plurality of physical frame carryings on the basis of first embodiment, comprise two kinds of situations:
First kind of situation, as shown in Figure 5, when adopting different physical frame transmitting user data, the channel resource block that same base node is associated is inequality.
In this case, at first the physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously; Then in other physical frame, according to the mode of frequency hopping every one's share of expenses for a joint undertaking carrier wave is arranged in the different physical channel resources pieces in the whole subband under each physical frame discontinuously, in the promptly different physical frames, the subcarrier that carries same data flow changes.
Second kind of situation, as shown in Figure 6, when adopting different physical frame transmitting user data, the channel resource block that same base node is associated is identical, and promptly in the different frame, the subcarrier that carries same data flow is identical.
In this case, at first the physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously; And in other physical frame, every one's share of expenses for a joint undertaking carrier wave is arranged in the corresponding physical channel resource block in the whole subband under each physical frame discontinuously according to the set-up mode identical with first physical frame.
The 3rd embodiment provided by the invention is a kind of multi-carrier communications systems, and its structure comprises transmitting terminal and receiving terminal as shown in Figure 7.
Wherein said transmitting terminal comprises coded modulation unit, subcarrier map unit and multi-carrier modulation unit.Wherein said subcarrier map unit comprises grouped element, unit and Multiplexing Unit is set.The described unit that is provided with comprises that first is provided with the unit.
Wherein said receiving terminal comprises that multicarrier demodulating unit, subcarrier are separated map unit and the demodulating unit of decoding.
After the base station according to the sub-band channel quality information of reporting of user is the intact logic channel node of described user distribution of flows to be sent, encode and modulation treatment to user's data packets in data flows to be sent in coded modulation unit by transmitting terminal, obtain corresponding data symbol, and send described data symbol to described subcarrier map unit;
Described subcarrier map unit is divided into N equal portions with the base station for the subcarrier that each base node under the logic channel node of user's distribution of flows to be sent is associated by grouped element; Every one's share of expenses for a joint undertaking carrier wave that subelement divides grouped element is set is arranged on discontinuously in the different physical channel resources pieces in the whole subband under the physical frame by first in the unit is set then, can be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave that described grouped element is divided equally spaced be arranged in the different Physical Resource Block in the whole subband under the same physical frame discontinuously.Then by Multiplexing Unit adopt the frequency division multiplexing mode with the base station on the subcarrier in the different physical channel resources pieces in the same subband under the same physical frame that different base node are multiplexed into described base node is associated of multi-user's different pieces of information flow distribution.
If certain distribution of flows to 1 base node, the subcarrier that this base node is associated are the subcarrier of 0,16,32, No. 48 Resource Block correspondence.Then the data symbol on this packet is modulated on the subcarrier of 0,16,32, No. 48 Resource Block correspondence and sends.The base node that different distribution of flows is different, the subcarrier multiplex that the mode of employing frequency division multiplexing is associated each base node in same physical frame.
Described multi-carrier modulation unit arrives a plurality of subcarrier-modulated that described subcarrier map unit is mapped to together, and by the antenna of described transmitting terminal described multicarrier data carried by data symbol is sent.
At receiving terminal, at first the signal that receives by antenna is carried out demodulation process by the multicarrier demodulating unit, then according to the base node that is assigned to, penetrate the unit by subcarrier reflection and extract data symbol on the subcarrier that is associated, then the data symbol that extracts is sent to the decoding demodulating unit and carry out the demodulating and decoding processing, recover the data flow that transmitting terminal transmits at last.
The 4th embodiment provided by the invention is the multi-carrier communications systems when adopting a plurality of physical frames to carry same data flow, the difference part of itself and the 3rd embodiment is: no longer be provided with first in the subcarrier map unit of the 3rd embodiment subelement is set, but second be provided with subelement, and the every one's share of expenses for a joint undertaking carrier wave that is used for adopting the frequency hopping mode that described grouped element is divided is arranged in the different Physical Resource Block of whole subband under the different physical frames discontinuously; Or every one's share of expenses for a joint undertaking carrier wave that described grouped element is divided is arranged under the different physical frames in the corresponding physical Resource Block in the whole subband.All the other and the 3rd embodiment provided by the invention duplicate, and are not described in detail here.
The embodiment that is provided by the invention described above as can be seen, because the subcarrier that the present invention is associated each base node is arranged in the whole subband of physical frame discontinuously, the channel quality that has fed back when having guaranteed the actual channel quality of transfer of data and sub-band scheduling can coincide preferably, even make user data only on a base node, transmit, also can obtain frequency diversity preferably, thereby help improving the performance of communication system.Fig. 8 is the simulation performance of the technical scheme that provides of the technical scheme provided by the invention that obtains after carrying out emulation under the PB3 channel model and prior art, No. 1 curve be the prior art scheme FER (frame error rate) curve, FER (frame error rate) curve of No. 2 curves sign technical solution of the present invention wherein.Can see, be 0.01 place at FER, and the technology of the present invention has the gain of 6dB than prior art.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. a method that realizes data flow multiplexing is characterized in that, comprising:
The base station is divided into the N equal portions for the subcarrier that same base node under the logic channel node of user's distribution of flows to be sent is associated, and be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged in the different physical channel resources pieces in the whole subband under the physical frame discontinuously;
Carry described data flow and transmit based on described subcarrier.
2. method according to claim 1 is characterized in that, also comprises:
The sub-band channel quality information that the base station is measured according to the user distributes corresponding logic channel node to give described user data flow to be sent.
3. method according to claim 1, it is characterized in that, when adopting different physical frame transmitting user data, physical channel resources piece with some is the interval, every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged on process in the different physical channel resources pieces in the whole subband under the physical frame discontinuously, specifically comprises:
Physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously; And in other physical frame, every one's share of expenses for a joint undertaking carrier wave is arranged on respectively in the different physical channel resources pieces in the whole subband under each physical frame discontinuously according to the frequency hopping mode;
Or,
Physical channel resources piece with some is the interval, and every one's share of expenses for a joint undertaking carrier wave equally spaced is arranged in the different physical channel resources pieces in the whole subband under first physical frame discontinuously; And in other physical frame, with every one's share of expenses for a joint undertaking carrier wave be arranged on discontinuously with the first physical frame corresponding physical channel resource block in.
4. method according to claim 1 is characterized in that, also comprises:
Adopting the frequency division multiplexing mode is on the subcarrier in the different physical channel resources pieces in the same subband under the same physical frame that different base node are multiplexed into described base node is associated of different distribution of flows with the base station.
5. a multi-carrier communications systems comprises transmitting terminal and receiving terminal, it is characterized in that:
Described transmitting terminal comprises the subcarrier map unit, be used for the base station is divided into the N equal portions for the subcarrier that the same base node under the logic channel node of user's distribution of flows to be sent is associated, and be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave uniformly-spaced is arranged on discontinuously in the different physical channel resources pieces in the whole subband under the physical frame; And the data symbol that obtains after the coded modulation is modulated on the described subcarrier;
Wherein, described subcarrier map unit comprises grouped element and the unit is set;
Described grouped element is used for the base station is divided into the N equal portions for the subcarrier that each base node under the logic channel node of user's distribution of flows to be sent is associated;
The described unit that is provided with, the physical channel resources piece that is used for some is the interval, every one's share of expenses for a joint undertaking carrier wave that grouped element is divided uniformly-spaced is arranged in the different physical channel resources pieces in the whole subband under the physical frame discontinuously.
6. multi-carrier communications systems according to claim 5 when adopting a plurality of physical frames to transmit data, is characterized in that:
The described unit that is provided with comprises that second is provided with subelement, the physical channel resources piece that is used for some is the interval, and the every one's share of expenses for a joint undertaking carrier wave that adopts the frequency hopping mode that described grouped element is divided uniformly-spaced is arranged under the different physical frames in the different Physical Resource Block in the whole subband discontinuously; Or be the interval with the physical channel resources piece of some, every one's share of expenses for a joint undertaking carrier wave that described grouped element is divided uniformly-spaced is arranged under the different physical frames in the corresponding physical Resource Block in the whole subband discontinuously.
7. according to claim 5 or 6 described multi-carrier communications systems, it is characterized in that:
Described subcarrier map unit also comprises Multiplexing Unit, and being used for adopting the frequency division multiplexing mode is the subcarrier of the different physical channel resources pieces in the same subband under the same physical frame that different base node are multiplexed into described base node is associated of different distribution of flows with the base station.
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| US10193655B2 (en) | 2008-01-15 | 2019-01-29 | Futurewei Technologies, Inc. | Method and apparatus for scheduling multimedia streams over a wireless broadcast channel |
| US8005102B2 (en) | 2008-03-31 | 2011-08-23 | Futurewei Technologies, Inc. | System and method for scheduling variable bit rate (VBR) streams in a wireless communications system |
| CN102098735B (en) * | 2009-12-09 | 2014-03-19 | 中兴通讯股份有限公司南京分公司 | Optimization method and device for discontinuous reception on multi-carrier |
| WO2014176774A1 (en) * | 2013-05-02 | 2014-11-06 | Harman International Industries, Incorporated | Transformation between time domain and frequency domain based on nearly orthogonal filter banks |
| CN115277340B (en) * | 2021-04-30 | 2024-04-19 | 维沃移动通信有限公司 | Data transmission method, device, equipment and storage medium |
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| US20020159430A1 (en) * | 2000-01-24 | 2002-10-31 | Hiroyuki Atarashi | Channel constructing method and base station using the method |
| WO2003003617A2 (en) * | 2001-06-29 | 2003-01-09 | Sepura Limited | Communications systems |
| CN1604509A (en) * | 2004-10-29 | 2005-04-06 | 清华大学 | Time-frequency matrix two-dimensional channel dynamic allocation method in multimedia information transmission |
| CN1759582A (en) * | 2003-08-18 | 2006-04-12 | Lg电子株式会社 | Sub-carrier allocation method for reducing inter-cell interference in OFDM cellular environment |
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| US20020159430A1 (en) * | 2000-01-24 | 2002-10-31 | Hiroyuki Atarashi | Channel constructing method and base station using the method |
| WO2003003617A2 (en) * | 2001-06-29 | 2003-01-09 | Sepura Limited | Communications systems |
| CN1759582A (en) * | 2003-08-18 | 2006-04-12 | Lg电子株式会社 | Sub-carrier allocation method for reducing inter-cell interference in OFDM cellular environment |
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