CN101316155A - Wireless transmission method adopting distributed MIMO and network coding technique - Google Patents
Wireless transmission method adopting distributed MIMO and network coding technique Download PDFInfo
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Abstract
The invention relates to a wireless transmission method which adopts distributed MIMO and network coding technology. The wireless data transmission usually cannot reach the ideal rate due to the limited emissive power, frequency spectra resource and so on. The specific steps of the method provided by the invention include transmission of source information, data reception and decoding at a trunk node, coding and data transmission at the trunk node, diversity reception and decoding at an information destination node. When a plurality of information source nodes all need to multicast the information to the information destination node, the information transmission to the trunk node is firstly carried out by the distributed MIMO mechanism, the trunk node adopts the network coding to carry out the distributed time-space coding. The communication between the trunk node and the information destination node also adopts the distributed MIMO mechanism. The method combines the MIMO mechanism with the network coding, which realizes the information transmission within a shorter time slot, also the antenna amount is reduced for the same transmission rate by utilizing the advantages of the network coding in the multicast.
Description
Technical field
The invention belongs to the wireless network transmissions field, relate to a kind of radio transmitting method that adopts network coding technique and distributed MIMO mechanism simultaneously, specifically be that a kind of utilization is when adopting distributed MIMO mechanism to improve the cordless communication network bandwidth, adopt the technology of network code at via node, make it possible to the more efficient use network bandwidth, reduce the number of antennas of the required employing of radio node when reaching transmission rate request.
Background technology
In the more than ten years in past, personal communication and mobile radio telecommunications have obtained extremely swift and violent development.Radio communication makes the transmission of data become convenient, quick, as long as in the area of coverage of network signal, just can carry out transfer of data anywhere or anytime, has eliminated the region restriction of using cable network to cause.Along with development of wireless communication devices, radio communication is being played the part of more and more important role in social economy and daily life, and people have gone out than higher in the past requirement the quality and the channel capacity of communication simultaneously.Yet the restriction of bandwidth, the decay of propagation, the time-varying characteristics of channel, factors such as noise jamming and multi-path problem are all restricting the development of radio communication service, make reliable high-rate wireless transfer of data become one and have challenging problem.
MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) technology is the important breakthrough of wireless communication field intelligent antenna technology, this technology is utilized many transmitting antennas and Duo Gen reception antenna, adopts diversity technique to obtain space diversity degree (sending order of diversity and receive diversity degree) to improve reliability of information transmission; Utilize the space channel between different dual-mode antennas, adopt space multiplexing technique to transmit a plurality of data flow simultaneously to increase the validity of message transmission.Because the signal that each transmitting antenna sends simultaneously takies identical frequency band,, greatly improve the rate of information throughput and improve information transmission performance so can under the prerequisite that does not additionally increase bandwidth, improve the capability of communication system and the availability of frequency spectrum exponentially.
The appearance of network code (Network coding) makes people for the network routing mode new understanding arranged, and perhaps has one day and will thoroughly change existing network transport mechanism.In the working method of network code, via node is no longer only transmitted the information of being received, but its coding back is transmitted, and this network transport mechanism can significantly improve the utilization ratio of the network bandwidth in the application of network multicast.When one or several node simultaneously when several other nodes send data, often will be by the transmission of other nodes.In traditional network, can only duplicate to the received signal, amplify and transmit as the node of relaying, this sometimes is a kind of waste for Internet resources.Network coding technique has been broken this restriction, and its allows via node that the information that receives is encoded, and a plurality of packets that will receive reconfigure according to certain special algorithm again and send.If the minimal cut between information source node and the information destination node is greater than information source information speed, by network code, information destination node just can recover the information of information source node fully so.
Utilization of network bandwidth when network code can significantly improve multicast, MIMO then can make the transmission rate of wireless network significantly improve.If network code and distributed MIMO transmission mechanism are combined, will bring into play the advantage of MIMO and network code simultaneously, thereby improve the rate of information throughput of wireless network.
Summary of the invention
The purpose of this invention is to provide the radio transmitting method that a kind of network code and distributed MIMO mechanism combine, this method is a target with bandwidth availability ratio and the transmission reliability that improves wireless network.This method is a kind of novel radio transmitting method, it introduces the thought of network code in the wireless network that uses distributed MIMO, be the mode that via node in the wireless network and information destination node all adopt multi-antenna diversity to receive, make message transmission in less time slot, to finish.And via node is not that the information of receiving is directly transmitted, but carries out sending after the network code again.The employing network code can be under the applied environment of multicast, the network bandwidth of more efficient use, and under the situation of the time slot that uses as much, can reduce required number of antennas.
The concrete steps of the inventive method are information source information transmission, regeneration node data reception and decoding, via node coding and data transmission, information destination node diversity reception and decoding.Specific as follows:
The method that described information source information sends adopts the wireless transmission method of current maturation for each information source node, and the information that needs are sent is carried out after chnnel coding and the modulation, sends to via node in the transmission range with the form of broadcasting.Because via node adopts many antennas to receive, and can receive the information of a plurality of information source node simultaneously, so the information source node information of can carrying out simultaneously sends.This transmission means is similar to the MIMO mechanism of the Space Time Coding that adopts horizontal slice, the number that needs to guarantee reception antenna is not more than the transmitting antenna number, therefore will be according to the number of antennas that topology of networks and via node had, allow information source node select suitable time slot to send information, make the number of the multiline message that via node receives be no more than its employed number of antennas.
Described regeneration node data receives and decoding is that via node adopts many antennas with the information decoding of receiving in each time slot, and the method for existing decoding demixing time space is adopted in decoding; The demodulation method of the modulation system correspondence that adopts according to information source node carries out demodulation then; Decipher according to the mode of the chnnel coding that information source information adopted again, the result who deciphers is stored.
It is that via node carries out the decoding information of storage to send behind network code and the distributed Space Time Coding that described via node coding and data send, and concrete steps are:
(1) via node carries out network code with the decoding information that decoding obtains, and coding adopts distributed random network code, or encodes based on the centralized network of global information.
(2) data that obtain after according to decoding information and network code of via node are carried out distributed Space Time Coding.Information after the different via node network codes can be regarded as the different layers of demixing time space when carrying out distributed Space Time Coding, adopt the horizontal slice Space Time Coding, also can be according to the concrete suitable distributed Space Time Coding of scene design.
(3) information after via node adopts distributed MIMO mechanism with Space Time Coding is sent to information destination node.Because the correct decoding Space Time Coding has certain requirement to the number of transmitting antenna and reception antenna, so the number of antennas that via node also needs to be had according to the mode of its Space Time Coding that adopts, network topology structure and other via node and information destination node is selected sending time slots, make other via node and information destination node satisfy under the restriction of required satisfied transmitting antenna of decoding Space Time Coding and reception antenna number relation, the data behind the coding are sent.
Described information destination node diversity reception and decoding are that each information destination node adopts multi-antenna diversity to receive information, and the information that receives is recovered complete raw information by decoding, and concrete steps are:
(1) information destination node is according to the mode of Space Time Coding that via node is taked, and the multiline message that uses corresponding interpretation method that aerial array is received is deciphered.Interpretation method is the interpretation method of existing horizontal slice Space Time Coding or the pairing interpretation method of specific Space Time Coding of employing.Decode results is via node and carries out network code resulting information afterwards.
(2) information destination node is utilized the decode results in the step (1), and the coding function that adopts when carrying out network code according to via node is deciphered, and recovers raw information.The coding function of the network code that via node adopted can be specified in advance, also can be included among the packet header of packet.According to the thought of network code, the requirement of the information network coding and decoding that this information destination node is received just can recover complete information source information.
The invention solves the problem of cast communication in the wireless network.When can't direct communication between a plurality of information destination node of wanting to communicate by letter in information source node and it, adopt via node to carry out information relay.When a plurality of information source node all need its information of multicast to give information destination node, at first carry out message transmission by the mechanism of distributed MIMO with via node, via node uses a plurality of antennas to receive the various information source node simultaneously, the information that receives is not simply must carry out data forwarding, but elder generation adopts the mode of network code, the information that receives is encoded, carry out distributed Space Time Coding again.The mechanism of distributed MIMO is also adopted in communication between via node and the information destination node.A plurality of via nodes form distributed a plurality of transmitting antenna, and information destination node uses a plurality of antennas to receive information.Adopt this mode, make the information transmission of a plurality of information source node and the information of a plurality of via nodes send to and in less time slot, to finish.And, just can recover complete raw information through deciphering according to the network code function that via node adopted as long as resulting information after the information decoding that information destination node receives many antennas satisfies the requirement of network code decoding.
The inventive method combines MIMO mechanism with network code, make and finish the information transmission in less time slot, utilizes the advantage of network code in multicast simultaneously, reduces to reach the same needed number of antennas of transmission rate.
Description of drawings
Fig. 1 is schematic network structure among the present invention;
Fig. 2 is the flow chart of message transmitting procedure among the present invention.
Embodiment
The present invention is applicable under the wireless environment, the scene that a plurality of information source node are communicated by letter with a plurality of information destination node.As shown in Figure 1, information source node A will send a1, a2 to information destination node C and D, and information source node B will send b1, b2 to information destination node C and D.C, D all not in the transmission range of A, B, need via node M1, M2, M3 to carry out information relay.M1, M2 are within the transmission range of A, and M2, M3 are within the transmission range of Node B, and C is within the transmission range of M1 and M2, and D is within the transmission range of M2 and M3.M2 is within the transmission range of M1 and M3, but M1 and M3 be not within the other side's transmission range.Suppose that A, B all use but antenna transmission information, via node M1, M2, M3 all use two antennas to receive information, and information destination node C, D use four antennas to receive information.And suppose that each node sends the information behind the unit data coding at most in the next time slot of the situation of using single antenna.
As shown in Figure 2, adopt the concrete steps of the radio transmitting method of distributed MIMO and network coding technique to be:
(1) information source information sends
Because information source node has only two, and each via node all uses two antenna receiving-sending information, satisfies reception antenna to be not less than the requirement of number of transmit antennas purpose, so two information source node can be transmitted information simultaneously.In the time slot 1, information source node A carries out information a1 chnnel coding and modulates result afterwards sending to M1 and M2, and information b1 is carried out chnnel coding to while information source node B and modulation result afterwards sends to M2 and M3.In the time slot 2, information source node A carries out information a2 chnnel coding and modulates result afterwards sending to M1 and M2, and information b2 is carried out chnnel coding to while information source node B and modulation result afterwards sends to M2 and M3.
(2) regeneration node data receives and decoding
Via node M1 receives A at time slot 1 and sends data, and demodulation also obtains information a1 according to the channel coding method decoding of A, the same information a2 that obtains in time slot 2; Via node M3 receives B at time slot 1 and sends data, and demodulation also obtains information b1 according to the channel coding method decoding of B, the same information b2 that obtains in time slot 2; The data that M2 then arrives two reception antenna diversity receptions in time slot 1 are deciphered according to the method for existing decoding demixing time space earlier, the mode of the channel error correction coding that is adopted according to information source node A, B is deciphered again, obtain a1 and b1, the same data decoding with receiving in the time slot 2 obtains a2 and b2.The information source information that via node M1, M2, M3 all obtain its decoding is stored in separately the memory, uses for ensuing cataloged procedure.
(3) via node coding and data send
A. via node carries out network code according to selected network code mode, selects the centralized network coded system based on global information in this example, and the supposition information destination node network code function having known via node in advance and adopted.M2 obtains x1 with a1 XOR b1, and b2 obtains x2 with the a2 XOR.
B. distributed herein Space Time Coding adopts the simplest mode, promptly adopts the mode of the Space Time Coding that is similar to horizontal slice, regards a1, a2, b1, b2, x1, x2 as layering data afterwards, only it is carried out chnnel coding.
C. because information destination node C, D all adopt four antennas to receive information, node C receives the information of four antenna transmission of M1 and M2, and D receives the information of four antenna transmission of M2 and M3, so satisfy the requirement of horizontal slice Space Time Coding to transmitting antenna and reception antenna number, M1, M2, M3 can send information in same time slot 3.
(4) receiving node diversity reception and decoding
D. information destination node C uses four antenna diversities to receive information, and adopts the method decoding of existing decoding demixing time space earlier, and the deciphering of chnnel coding of carrying out of adopting according to via node obtains a1, a2, x1, x2 again.Similarly information destination node D obtains b1, b2, x1, x2.
E.C obtains b1 with x1 XOR a1, and x2 XOR a2 obtains b2; Same, D obtains a1 with x1 XOR b1, and x2 XOR b2 obtains a2.
Claims (1)
1, adopts the radio transmitting method of distributed MIMO and network coding technique, it is characterized in that steps of the method are information source information transmission, regeneration node data reception and decoding, via node coding and data transmission, information destination node diversity reception and decoding;
Described information source information is sent as information that each information source node adopts wireless transmission method will need to send carry out chnnel coding and modulation after, send to via node in the transmission range with the form of broadcasting;
Described regeneration node data receives and decoding is that via node adopts many antennas that the information of receiving in each time slot is deciphered, and the interpretation method of demixing time space correspondence is adopted in decoding; The demodulation method of the modulation system correspondence that adopts according to information source node carries out demodulation then; Decipher according to the mode of the chnnel coding that information source information adopted again, the result who deciphers is stored;
It is that via node carries out the decoding information of storage to send behind network code and the distributed Space Time Coding that described via node coding and data send, and concrete steps are:
A. via node carries out network code with the decoding information that decoding obtains, and coding adopts distributed random network code method, or based on the centralized network coding method of global information;
B. the data that obtain after according to decoding information and network code of via node are carried out distributed Space Time Coding;
C. the information after via node adopts distributed MIMO mechanism with Space Time Coding is sent to information destination node;
Described information destination node diversity reception and decoding are that each information destination node adopts multi-antenna diversity to receive information, and the information that receives is recovered complete raw information by decoding, and concrete steps are:
D. information destination node is according to the mode of Space Time Coding that via node is taked, and the multiline message that uses corresponding interpretation method that aerial array is received is deciphered;
E. information destination node is utilized decode results, and the coding function that adopts when carrying out network code according to via node is deciphered, and recovers raw information.
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| WO2010078772A1 (en) * | 2009-01-07 | 2010-07-15 | 中兴通讯股份有限公司 | Space time coding method in orthogonal network and relay transmission system |
| WO2011020213A1 (en) * | 2009-08-18 | 2011-02-24 | 上海贝尔股份有限公司 | Method and apparatus for data relay and data decoding |
| CN102511192A (en) * | 2009-09-25 | 2012-06-20 | 索尼公司 | Communication system, method, base station, and communication device |
| WO2012106842A1 (en) * | 2011-02-11 | 2012-08-16 | 富士通株式会社 | Data transmission method, wireless communication system, destination node and relay node |
| WO2013189383A3 (en) * | 2012-08-20 | 2014-02-13 | 中兴通讯股份有限公司 | Processing method and device for performing space-time decoding on mimo signal |
| WO2017113394A1 (en) * | 2015-12-31 | 2017-07-06 | 华为技术有限公司 | Data transmission method and device |
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| WO2011020213A1 (en) * | 2009-08-18 | 2011-02-24 | 上海贝尔股份有限公司 | Method and apparatus for data relay and data decoding |
| CN105656531A (en) * | 2009-09-25 | 2016-06-08 | 索尼公司 | Communication system, method, base station, and communication device |
| CN102511192A (en) * | 2009-09-25 | 2012-06-20 | 索尼公司 | Communication system, method, base station, and communication device |
| CN105656531B (en) * | 2009-09-25 | 2019-04-26 | 索尼公司 | Communication system, communication means, base station and communication equipment |
| US9831990B2 (en) | 2009-09-25 | 2017-11-28 | Sony Corporation | Communication system, method, base station, and communication device |
| US9107207B2 (en) | 2009-09-25 | 2015-08-11 | Sony Corporation | Communication system, method, base station, and communication device |
| WO2012106842A1 (en) * | 2011-02-11 | 2012-08-16 | 富士通株式会社 | Data transmission method, wireless communication system, destination node and relay node |
| US9172450B2 (en) | 2012-08-20 | 2015-10-27 | Zte Corporation | Processing method and device for performing space-time decoding on MIMO signal |
| CN103634078B (en) * | 2012-08-20 | 2017-02-08 | 中兴通讯股份有限公司 | Processing method and device for performing space-time decoding on MIMO signal |
| CN103634078A (en) * | 2012-08-20 | 2014-03-12 | 中兴通讯股份有限公司 | Processing method and device for performing space-time decoding on MIMO signal |
| WO2013189383A3 (en) * | 2012-08-20 | 2014-02-13 | 中兴通讯股份有限公司 | Processing method and device for performing space-time decoding on mimo signal |
| WO2017113394A1 (en) * | 2015-12-31 | 2017-07-06 | 华为技术有限公司 | Data transmission method and device |
| CN109302266A (en) * | 2018-09-21 | 2019-02-01 | 南京航空航天大学 | High energy efficiency cooperative relay network transmission method based on double-layer network coding |
| CN109302266B (en) * | 2018-09-21 | 2020-08-18 | 南京航空航天大学 | High-energy-efficiency cooperative relay network transmission method based on double-layer network coding |
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