CN103188809A - Free duplex communication system and channel allocation method thereof - Google Patents
Free duplex communication system and channel allocation method thereof Download PDFInfo
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- CN103188809A CN103188809A CN2011104571677A CN201110457167A CN103188809A CN 103188809 A CN103188809 A CN 103188809A CN 2011104571677 A CN2011104571677 A CN 2011104571677A CN 201110457167 A CN201110457167 A CN 201110457167A CN 103188809 A CN103188809 A CN 103188809A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a free duplex communication system and a channel allocation method of the free duplex communication system. Communication devices in common frequency division duplex (FDD) mode or in common time division duplex (TDD) mode are arranged on fringe nodes of the free duplex communication system. A center node carries out bidirectional transceiving on the same physical channel. The center node comprises an independent transmitter and an independent receiver. The receiver receives signals S transmitted by the transmitter through wired connection in the communication device. The channel between a transmitting antenna and a receiving antenna is obtained by estimating. The center node further comprises an interference eliminator which is used for eliminating interference signals of the signal S. As for the TDD mode, the channel allocation method adopts the strategy that all the time slots can be used for ascending and descending at the same time. As for the FDD mode, the channel allocation method adopts the strategy that channels of all the frequency points can be used for receiving and transmitting at the same time. The free duplex communication system and the channel allocation method of the free duplex communication system can greatly reduce frequency spectrum consumption that physical channels are respectively allocated to receiving communication and transmitting communication in order to support bidirection communication.
Description
Technical field
The present invention relates to a kind of communication means, be specifically related to a kind of communication system and method for channel allocation thereof of free duplex, belong to wireless communication field.
Background technology
In recent years, the frequency spectrum resource in the radio communication becomes more and more rare, and how the interference in the minimizing system effectively accurately transmits data at high speed, thereby improves spectrum efficiency and the power system capacity of system, becomes an important topic in the radio communication theoretical research.Present duplex mode mainly be divided into Frequency Division Duplexing (FDD) (Frequency Division Duplex, FDD) and time division duplex (Time Division Duplex, TDD).FDD receives and transmits at the channel of different frequency; TDD is at same frequency, different time-gap receiving and transmitting signal.These two kinds of duplex modes all need to be uplink and downlink distributing independent frequency spectrum resource.Usually, up-downgoing respectively take system's total frequency spectrum half can satisfy the up-downgoing business demand of symmetry.In recent years, (Code Division Duplex, technology CDD), this technology are that up-downgoing distributes different sign indicating number channels to communicate, and also are in essence frequency resource is carried out being the up-downgoing allocated channel after orthogonality is divided to have the researcher to propose code division duplex again.
Figure 1 shows that the channel distribution mode of traditional time division duplex and Frequency Division Duplexing (FDD).In traditional approach, each fringe node carries out in different time or frequency channels with the transmitting-receiving of Centroid in the Star Network.
Summary of the invention
The objective of the invention is to propose a kind of new duplex communication method to save the transmitting-receiving frequency band, the present invention includes system configuration and method for channel allocation.
Basic thought of the present invention is to utilize interference signal to eliminate and/or isolation technology is implemented in two-way communication on the same physical channel, this duplex mode be called free duplex (Free Duplex, FD).
Technical scheme provided by the invention is as follows:
A kind of free duplex (Free Duplex, communication system FD), described communication system are a star network (as shown in Figure 3) that comprises the multi-user, described star network is made up of a Centroid and a plurality of fringe node, it is characterized in that,
Described fringe node all is the communication equipment of common FDD mode, perhaps all is the communication equipment of general T DD mode;
Described Centroid carries out bidirectional transmit-receive (as Fig. 4) at same physical channel;
Described Centroid comprises independently transmitter and receiver.This receiver obtains the signal S that this transmitter is launched at device interior by wired connection, and the channel between transmitting antenna and reception antenna also can be by estimating acquisition;
Described Centroid also comprises an interference eliminator, is used for that above-mentioned signal S is carried out interference signal and eliminates.
Described communication system is characterized in that, communicates by wireless mode between described Centroid and the fringe node.
Described communication system is characterized in that, the transmitting antenna of described Centroid and the channel between reception antenna are by estimating acquisition; Can isolate by baffle plate between transmitting antenna and the reception antenna, to reduce transmitting antenna to the interference of reception antenna.
Described communication system is characterized in that, described channel estimation methods is the channel estimating based on pilot tone, and namely transmitter is launched pilot signal periodically, and receiver carries out least mean-square error channel estimating or maximum likelihood channel estimating according to the pilot signal that receives.
Described communication system is characterized in that, after described receiver obtains transmitter and transmits and obtain channel guess value, described interference eliminator disturbs elimination to the interference signal that receives, and interference signal eliminated from receive signal, disturb eliminate after, receiver carries out demodulation to echo signal.
Described communication system is characterized in that, at radio frequency and digital baseband respectively or unite and disturb elimination.
The method for channel allocation of described communication system (as Fig. 2) is responsible for access and the channel allocation of each node by centralized control unit, again the channel allocation result is sent to communication node by signaling channel, it is characterized in that,
When fringe node is traditional time division duplex equipment, channel reserved time slot dividing mode, but described channel all can be used for uplink and downlink simultaneously at each time slot; For Centroid, each time slot is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other;
When fringe node is traditional Frequency Division Duplexing (FDD) equipment, channel reserve frequency channel distribution mode, but the channel of each frequency all can be used for receiving and emission simultaneously; For Centroid, the channel of each frequency is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other.
Described method for channel allocation is characterized in that, is the situation of traditional time division duplex equipment for fringe node, and its method for channel allocation is as follows:
At first, carry out the downlink or uplink time slot allocation for all users;
Then, the cyclic shift of the downlink or uplink user's time slot that distributes being carried out i time slot has just obtained the result of upstream or downstream time slot allocation.
Described method for channel allocation is characterized in that, is the situation of traditional Frequency Division Duplexing (FDD) equipment for fringe node, and its method for channel allocation is as follows:
At first, carry out the downlink or uplink channel allocation for all users;
Then, the cyclic shift of the downlink or uplink user's frequency channels that distributes being carried out i frequency has just obtained upstream or downstream channel frequency distribution result.
Described method for channel allocation is characterized in that, described method of carrying out the downlink or uplink channel allocation of the first step for all users is the method for channel allocation of poll.
Beneficial effect of the present invention: system and method provided by the invention can be reduced in a large number to be supported two-way communication and distributes to the frequency spectrum consumption that the physical channel of transmitting-receiving communication brings respectively.
Description of drawings
Fig. 1. traditional duplexing channel distribution mode: (a) time-derived channel; (b) frequency splitting channel
Fig. 2. free duplex channel dividing mode: (a) time-derived channel; (b) frequency splitting channel
Fig. 3. the Star Network structure chart
Fig. 4. the Centroid schematic diagram
Fig. 5. time division multiple access user's up-downgoing channel allocation example
Fig. 6. frequency division multiple access user's up-downgoing channel allocation example
Embodiment
Below in conjunction with accompanying drawing the present invention is illustrated in further detail, but the scope that does not limit the present invention in any way.
In cellular radio Communication system, the base station of each cellular cell (being Centroid of the present invention) serves for a plurality of users in the residential quarter.Adopt an execution mode of the inventive method to be, the base station end adopts multi-antenna structure as shown in Figure 4, has independently transmitting antenna and reception antenna.Receiver can obtain the signal that transmitter is launched by wired connection in internal system, and utilizes this signal to disturb elimination.Interference eliminator can use existing interference elimination method, for example: an interference eliminator unit is set at the receiver place, the jamming transmitter signal that this unit by using wired connection transmission comes is handled, and recovers interference signal, then it is cut from receive signal.User terminal can adopt the equipment of existing FDD or the work of TDD mode, can adopt single antenna to receive and dispatch.
Below, be FDD and two kinds of scheme references of TDD channel allocation method according to the terminal use:
(1) user is tdd mode
For reducing the complexity of subscriber terminal equipment, each user's uplink and downlink channel adopts time division duplex.For the base station, each time slot is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other.The base station termination is received the interference that antenna is received self transmitting antenna, need carry out known interfering signal and eliminate.Because the portable terminal signal power is lower, thereby interfering with each other less.By rational management, user terminal does not need to disturb elimination.Figure 5 shows that the user carries out the example that uplink and downlink timeslot distributes, each user's uplink and downlink timeslot is different.
Particularly, disturb duplex channel distribution method step as follows.At first, for carrying out descending time slot, all users distribute.If channel has M time slot, time-gap number is respectively 0,1 ..., M-1, distribution method can adopt any existing resources distribution method, as: based on method for channel allocation of poll etc.Then, the cyclic shift that the downlink user time slot that distributes is carried out i time slot has just obtained the ascending time slot distribution result (1≤i≤M-1) is namely for the descending user who is assigned to j time slot (0≤j≤M-1), its uplink assignment [i+j]
MIndividual time slot, wherein [x]
MExpression rems about M to the digital x in the bracket.In example shown in Figure 4, M=7, i=1.
(2) user is fdd mode
When user's channel adopts the mode of frequency division, for reducing the complexity of subscriber terminal equipment, can be the channel of different frequency with each user's uplink and downlink channel allocation; Be Frequency Division Duplexing (FDD) for the sole user namely, user terminal does not need to disturb elimination.And for the base station, the channel of each frequency is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other.The base station termination is received the interference that signal that antenna receives comprises self transmitting antenna, need carry out known signal and disturb and eliminate.Figure 6 shows that the user carries out the example that the up-downgoing frequency is distributed, each user's up-downgoing frequency is different.
The interference duplex channel distribution method of frequency division multiple access is with similar described in (1).Set up departments and command the wide M of being divided into sub-frequency bands, number from 0 to M-1.At first, for carrying out down channel, all users distribute.Then, the cyclic shift that the downlink user frequency channels that distributes is carried out i frequency has just obtained up channel frequency distribution result (1≤i≤M-1), the i.e. descending user who is assigned to j frequency (0≤j≤M-1), its uplink assignment [i+j]
MThe channel of individual frequency, wherein [x]
MExpression rems to the digital x in the bracket, but M is the dividing frequency number of channel.In example shown in Figure 6, M=7, i=1.
Claims (10)
1. the communication system of a free duplex, described communication system is a star network that comprises the multi-user, described star network is made up of a Centroid and a plurality of fringe node, it is characterized in that,
Described fringe node all is the communication equipment of common FDD mode, perhaps all is the communication equipment of general T DD mode;
Described Centroid carries out bidirectional transmit-receive at same physical channel;
Described Centroid comprises independently transmitter and receiver, and this receiver obtains the signal S that this transmitter is launched at device interior by wired connection;
Described Centroid also comprises an interference eliminator, is used for that above-mentioned signal S is carried out interference signal and eliminates.
2. communication system as claimed in claim 1 is characterized in that, communicates by wireless mode between described Centroid and the fringe node.
3. communication system as claimed in claim 1 is characterized in that, the transmitting antenna of described Centroid and the channel between reception antenna are by estimating acquisition; Isolate by baffle plate between transmitting antenna and the reception antenna, to reduce transmitting antenna to the interference of reception antenna.
4. communication system as claimed in claim 3, it is characterized in that, described channel estimation methods is the channel estimating based on pilot tone, and namely transmitter is launched pilot signal periodically, and receiver carries out least mean-square error channel estimating or maximum likelihood channel estimating according to the pilot signal that receives.
5. communication system as claimed in claim 3, it is characterized in that, after described receiver obtains transmitter and transmits and obtain channel guess value, described interference eliminator disturbs elimination to the interference signal that receives, and interference signal eliminated from receive signal, after disturbing elimination, receiver carries out demodulation to echo signal.
6. communication system as claimed in claim 5 is characterized in that, at radio frequency and digital baseband respectively or unite and disturb elimination.
7. the method for channel allocation of the described communication system of claim 1 is responsible for access and the channel allocation of each node by centralized control unit, again the channel allocation result is sent to communication node by signaling channel, it is characterized in that,
When fringe node is traditional time division duplex equipment, channel reserved time slot dividing mode, but described channel all can be used for uplink and downlink simultaneously at each time slot; For Centroid, each time slot is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other;
When fringe node is traditional Frequency Division Duplexing (FDD) equipment, channel reserve frequency channel distribution mode, but the channel of each frequency all can be used for receiving and emission simultaneously; For Centroid, the channel of each frequency is existing uply also to be had descendingly, and the user of up-downgoing has nothing in common with each other.
8. method for channel allocation as claimed in claim 7 is characterized in that, is the situation of traditional time division duplex equipment for fringe node, and its method for channel allocation is as follows:
At first, carry out the downlink or uplink time slot allocation for all users;
Then, the cyclic shift of the downlink or uplink user's time slot that distributes being carried out i time slot has just obtained the result of upstream or downstream time slot allocation.
9. method for channel allocation as claimed in claim 7 is characterized in that, is the situation of traditional Frequency Division Duplexing (FDD) equipment for fringe node, and its method for channel allocation is as follows:
At first, carry out the downlink or uplink channel allocation for all users;
Then, the cyclic shift of the downlink or uplink user's frequency channels that distributes being carried out i frequency has just obtained upstream or downstream channel frequency distribution result.
10. method for channel allocation as claimed in claim 8 or 9 is characterized in that, described method of carrying out the downlink or uplink channel allocation for all users is the method for channel allocation of poll.
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| CN201110457167.7A CN103188809B (en) | 2011-12-30 | 2011-12-30 | A kind of freely communication system and the method for channel allocation thereof of duplex |
| CN201610010175.XA CN105592466B (en) | 2011-12-30 | 2011-12-30 | A kind of communication channel allocation method of freely duplex |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108183781A (en) * | 2017-11-28 | 2018-06-19 | 北京大学 | A kind of method that NB-IoT systems share frequency spectrum with other wide-band communication systems |
| CN109450569A (en) * | 2018-11-19 | 2019-03-08 | 中国舰船研究设计中心 | A kind of electronic equipment frequency point mutual interference method for quick predicting |
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| CN104981016B (en) * | 2015-04-23 | 2019-02-01 | 四川海格恒通专网科技有限公司 | A kind of link channel distribution method of Radio Link |
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| EP2365623A1 (en) * | 2010-03-10 | 2011-09-14 | Nxp B.V. | Isolated mains power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183781A (en) * | 2017-11-28 | 2018-06-19 | 北京大学 | A kind of method that NB-IoT systems share frequency spectrum with other wide-band communication systems |
| CN108183781B (en) * | 2017-11-28 | 2020-10-09 | 北京大学 | Method for sharing spectrum between NB-IoT system and other broadband communication systems |
| CN109450569A (en) * | 2018-11-19 | 2019-03-08 | 中国舰船研究设计中心 | A kind of electronic equipment frequency point mutual interference method for quick predicting |
| CN109450569B (en) * | 2018-11-19 | 2021-05-25 | 中国舰船研究设计中心 | Method for rapidly predicting frequency point mutual interference of electronic equipment |
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| CN103188809B (en) | 2016-05-11 |
| CN105592466A (en) | 2016-05-18 |
| CN105592466B (en) | 2019-02-01 |
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