CN104779987B - A kind of relay transmission method of extensive multiple-input-multiple-output communication system - Google Patents
A kind of relay transmission method of extensive multiple-input-multiple-output communication system Download PDFInfo
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Abstract
The invention discloses a kind of relay transmission methods of extensive multiple-input-multiple-output communication system, belong to field of communication technology, solve the technical issues of how selecting suitable antenna to participate in transmission.The relay transmission method of the extensive multiple-input-multiple-output communication system includes: the channel state information for obtaining the first user terminal and second user terminal to relay node；According to channel state information, the corresponding relay antenna of maximum channel gain range is obtained；Using accessed relay antenna, signal transmission is carried out.The present invention is suitable for extensive multiple-input-multiple-output communication system.
Description
Technical field
The present invention relates to fields of communication technology, specifically, being related to a kind of extensive multiple-input-multiple-output communication system
Relay transmission method.
Background technique
In extensive multiple-input and multiple-output (Multi-input Multi-output, abbreviation MIMO) communication system, transmitting
End is provided with a large amount of or large-scale antenna array, and each antenna element can respective independently transmitted signal, while receiving end can
It is received by one or more antennas and restores prime information.Extensive multiple-input-multiple-output communication system is with its peculiar advantage:
Obtain the channel capacity of more high magnification numbe, lower energy consumption, very accurately space discrimination, relatively inexpensive hardware realization
Deng obtaining the comparable concern of wireless communication field.
In general, the base station end of extensive multiple-input-multiple-output communication system is configured with the antenna of a large amount of numbers, such as 64
Root or 128 need and the same number of radio frequency link of antenna for base station when all antennas are involved in signal transmission；Simultaneously big
Correlation in scale multiple-input-multiple-output communication system, with the increase of base station end number of antennas, between different user channel
Increase with the increase of number of users, the implementation complexity and cost for leading to system are than common multiple-input-multiple-output communication system
Want high more.In order to obtain more preferably system performance while reducing cost and complexity, generally require by selecting base station
Antenna is realized, that is, suitable antenna for base station is selected to participate in transmission.
Summary of the invention
The purpose of the present invention is to provide a kind of relay transmission methods of extensive multiple-input-multiple-output communication system, with solution
The technical issues of certainly how selecting suitable antenna to participate in transmission.
The present invention provides a kind of relay transmission methods of extensive multiple-input-multiple-output communication system, this method comprises:
Obtain the first user terminal and second user terminal to relay node channel state information；
According to channel state information, the corresponding relay antenna of maximum channel gain range is obtained；
Using accessed relay antenna, signal transmission is carried out.
Wherein, using accessed relay antenna, carrying out signal transmission includes:
Based on the transmission mode pre-seted, the signal transmitted between the first user terminal and second user terminal is carried out pair
The conversion process answered；
Using accessed relay antenna, propagation and transformation treated signal.
Wherein, based on the transmission mode pre-seted, to the signal transmitted between the first user terminal and second user terminal
Carrying out corresponding conversion process includes:
Based on the transmission mode pre-seted, corresponding relaying signal transformation matrix is obtained；
According to accessed relaying signal transformation matrix, to what is transmitted between the first user terminal and second user terminal
Signal carries out corresponding conversion process.
Wherein, it obtains the first user terminal and the channel state information of second user terminal to relay node includes:
According to least-squares algorithm or Minimum Mean Squared Error estimation algorithm, the first user terminal and second user terminal are obtained
To the channel state information of relay node.
Wherein, the channel state information is instantaneous channel state information or statistical channel status information.
Wherein, transmission mode includes reception pattern and forward mode.
Wherein, reception pattern is maximum-ratio combing mode or urgent null mode, and forward mode is high specific transmission mode or compels
Null mode.
Wherein, the pass-through mode of relay node is amplification forwarding mode.
Present invention offers following the utility model has the advantages that providing a kind of relaying biography of extensive multiple-input-multiple-output communication system
Transmission method, the relay node in the present invention after obtaining channel state information, can according to based on channel gain maximization principle,
Obtain reception and forwarding of the corresponding relay antenna to carry out signal.This method advantageously reduces extensive multiple-input and multiple-output
Communication system carries out computation complexity when relay antenna selection, convenient for quickly and efficiently obtaining suitable relay antenna.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, required in being described below to embodiment
Attached drawing does simple introduction:
Fig. 1 is the process of the relay transmission method of the extensive multiple-input-multiple-output communication system in the embodiment of the present invention
Figure；
Fig. 2 is the structural schematic diagram of the extensive multiple-input-multiple-output communication system in the embodiment of the present invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
The embodiment of the invention provides a kind of relay transmission method of extensive multiple-input-multiple-output communication system, such as Fig. 1
It is shown, this method comprises:
Step S101, obtain the first user terminal and second user terminal to relay node channel state information.
As shown in Fig. 2, the first user terminal S1It is provided with total K antenna, second user terminal S2It is also equipped with total K
A antenna, K are any integers greater than 1.First user terminal S1With second user terminal S2Between be provided with a relay node,
Total M antenna is provided on the relay node, M is similarly any integer greater than 1, in extensive multiple input multiple output communications
In system, the value of M is far longer than K.
The first user terminal S is established by relay node1With second user terminal S2Between communication, relay node is first
First need to obtain the first user terminal and second user terminal to relay node channel state information (Channel State
Information, abbreviation CSI).In wireless communication field, so-called CSI is exactly the channel attribute of communication link.It is described
Decay factor of the signal on every transmission paths, the i.e. value of each element in channel gain matrix G, such as signal dispersion, distance
The information such as decaying.Obtaining accurate CSI can make communication system adapt to current channel condition, in multi-antenna systems can for height
Communication by property high-speed provides guarantee.
It in embodiments of the present invention, can be according to least-squares algorithm, alternatively, can also be according to Minimum Mean Squared Error estimation
The channel state information of algorithm, the first user terminal of acquisition and second user terminal to relay node
Wherein, channel matrixM row kth column elementIt indicates from the first user terminal S1K-th of antenna in
After the estimated value of the channel state information between m-th of antenna of node；Channel matrixM row kth column elementIt indicates from second user terminal S2K-th of antenna to the channel state information between m-th of antenna of relay node
Estimated value.
In practical application, CSI has instantaneous CSI (Instantaneous CSI) and statistical CSI (Statistical CSI)
Two kinds.Wherein, instantaneous CSI refers to channel immediate status, it can make transmitting terminal adjust transmitting signal in time, therefore it can be with
Optimal reception signal can be obtained in space multiplexing system by obtaining low error rate.
And statistical CSI refers to the statistical property of channel whithin a period of time, it contains the distribution of fading channel, average letter
Road gain, sighting distance (Line of Sight, abbreviation LOS) component and spatial coherence.For instantaneous CSI, statistical CSI
Signal transmit process can be made to be optimal.
In fact, the acquisition of CSI is limited to the speed of channel variation.In rapid fading system, possible channel is in transmission one
It just changes after a character, it is more reasonable to describe channel status with statistical CSI at this time.In slow fading system, channel is being obtained
Can transmit the character of a period of time after instantaneous CSI and just change, communication efficiency can be improved with instantaneous CSI at this time.
In embodiments of the present invention, the pass-through mode of relay node is preferably amplification forwarding (Amplify and
Forward, abbreviation AF) mode, relay node will only relay to destination after the source information received amplification, without solution
Code demodulation, it is easy to accomplish and cost of implementation is lower.
Step S102, according to channel state information, the corresponding relay antenna of maximum channel gain range is obtained.
Relay node can be determined as the first user after getting channel state information according to the channel state information
Terminal S1With second user terminal S2Transmit relay antenna used in signal.
Specifically, in embodiments of the present invention, by taking instantaneous channel state information as an example, relay node is getting the first use
Family terminal S1With second user terminal S2To the instantaneous channel state information of relay nodeWithLater, increased based on channel
Beneficial maximization principle, the channel gain for calculating the extensive multiple-input-multiple-output communication system of sening as an envoy to reach maximum relaying day
Line.Wherein, the selection method of relay antenna is shown below:
Obviously, according to the selected relay antenna i of above formulaSTEnable to all user terminals between relay node
The amplitude square of the channel gain of link and reach that maximum root antenna.
Then, the relay transmission method of extensive multiple-input-multiple-output communication system provided by the present invention further include:
Step S103, using accessed relay antenna, signal transmission is carried out.
After i.e. trunk node selection is used on the relay antenna of transmission, i.e., the reception of signal is carried out using the relay antenna
And forwarding.
For different transmission modes, relay node has different processing modes to signal.Therefore, the embodiment of the present invention
In, relay node is needed based on the transmission mode pre-seted, to the letter transmitted between the first user terminal and second user terminal
Number carry out corresponding conversion process.
Specifically, transmission mode includes reception pattern and forward mode, relay node according to the reception pattern pre-seted and
Forward mode obtains corresponding relaying signal transformation matrix.
In embodiments of the present invention, reception pattern is preferably up to than merging (Maximum Ratio Combining, letter
Claim MRC) mode or force zero (Zero-Forcing, abbreviation ZF) mode, forward mode is preferably up to than transmission (Maximal
Ratio Transmission, abbreviation MRT) mode or urgent null mode.I.e. in embodiments of the present invention, reception pattern and forwarding mould
Formula can have following four kinds of combinations: reception pattern is maximum-ratio combing mode, and forward mode is high specific transmission mode；Reception pattern
It is urgent null mode with forward mode；Reception pattern is to compel null mode, and forward mode is high specific transmission mode；And receive mould
Formula is maximum-ratio combing mode, and forward mode is to compel null mode.
The combination of above-mentioned four kinds of reception patterns and forward mode especially suitable for extensive multiple-input-multiple-output communication system,
Especially relay antenna it is in a large number when, the efficiency of the extensive multiple-input-multiple-output communication system can obtain significantly
It is promoted.
Specifically, the form of the corresponding relaying signal transformation matrix W of the combination of each reception pattern and forward mode is as follows:
If reception pattern is maximum-ratio combing mode, forward mode is high specific transmission mode, and corresponding relaying signal becomes
It is as follows to change matrix W:
If reception pattern and forward mode are urgent null mode, corresponding relaying signal transformation matrix W is as follows:
If reception pattern is to compel null mode, forward mode is high specific transmission mode, corresponding relaying signal transformation matrix W
It is as follows:
If reception pattern is maximum-ratio combing mode, forward mode is to compel null mode, corresponding relaying signal transformation matrix W
It is as follows:
Wherein, in aforementioned four relaying signal transformation matrix,For channel matrixAssociate matrix, correspondingly,For channel matrixAssociate matrix.In addition, each coefficient a in aforementioned four relaying signal transformation matrixmrc/mrt、
azf/zf、azf/mrtAnd amrc/zfIt is the constant in order to meet relay transmission power limit, can be obtained by simple algebraic manipulation,
The embodiment of the present invention repeats no more this.
Relaying signal transformation matrix is determined according to the reception pattern and sending mode pre-seted, and relay node can be according to this
Signal transformation matrix is relayed, the signal transmitted between the first user terminal and second user terminal is carried out at corresponding transformation
Reason.Later, relay node can utilize accessed relay antenna, and the signal after conversion process is transferred out.
To sum up, in embodiments of the present invention, a kind of relay transmission of extensive multiple-input-multiple-output communication system is provided
Method, the relay node in the present invention can be obtained after obtaining channel state information according to based on channel gain maximization principle
Obtain reception and forwarding of the corresponding relay antenna to carry out signal.It is logical that this method advantageously reduces extensive multiple-input and multiple-output
Letter system carries out computation complexity when relay antenna selection, convenient for quickly and efficiently obtaining suitable relay antenna.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (7)
1. a kind of relay transmission method of extensive multiple-input-multiple-output communication system characterized by comprising
Obtain the first user terminal and second user terminal to relay node channel state information；
According to channel state information, the corresponding single relay antenna of maximum channel gain range is obtained；
Using accessed single relay antenna, signal transmission is carried out；
Wherein, the channel state information is instantaneous channel state information or statistical channel status information；When the channel status
When information is instantaneous channel state information, according to the instantaneous channel state information of first user terminal to relay node and institute
The instantaneous channel state information for stating second user terminal to relay node determines first user terminal and second user terminal
Single relay antenna to the amplitude square of the channel gain of the link between relay node and when reaching maximum.
2. the method according to claim 1, wherein carrying out signal transmission using accessed relay antenna
Include:
Based on the transmission mode pre-seted, the signal transmitted between the first user terminal and second user terminal is carried out corresponding
Conversion process；
Using accessed relay antenna, propagation and transformation treated signal.
3. according to the method described in claim 2, it is characterized in that, based on the transmission mode pre-seted, to the first user terminal
The signal transmitted between second user terminal carries out corresponding conversion process:
Based on the transmission mode pre-seted, corresponding relaying signal transformation matrix is obtained；
According to accessed relaying signal transformation matrix, to the signal transmitted between the first user terminal and second user terminal
Carry out corresponding conversion process.
4. the method according to claim 1, wherein obtaining the first user terminal and second user terminal to relaying
The channel state information of node includes:
According to least-squares algorithm or Minimum Mean Squared Error estimation algorithm, the first user terminal and second user terminal are obtained in
After the channel state information of node.
5. according to the method described in claim 3, it is characterized in that,
Transmission mode includes reception pattern and forward mode.
6. according to the method described in claim 5, it is characterized in that,
Reception pattern is maximum-ratio combing mode or urgent null mode, and forward mode is high specific transmission mode or urgent null mode.
7. according to the method described in claim 6, it is characterized in that,
The pass-through mode of relay node is amplification forwarding mode.
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| CN102006654A (en) * | 2010-12-24 | 2011-04-06 | 朱义君 | Method and system for power allocation in multi-relay cooperative communication |
| CN102055565A (en) * | 2010-12-24 | 2011-05-11 | 清华大学 | Space diversity method for physical layer network coding in communication system |
| CN102355291A (en) * | 2011-07-18 | 2012-02-15 | 北京邮电大学 | Multithread bidirectional relay transmission method based on amplification forwarding |
| CN103532602A (en) * | 2012-07-05 | 2014-01-22 | 上海交通大学 | Antenna selection method and relay node |
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| CN102340340A (en) * | 2010-07-21 | 2012-02-01 | 中兴通讯股份有限公司 | Method and system for realizing antenna selection in MIMO relay system |
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| CN102006654A (en) * | 2010-12-24 | 2011-04-06 | 朱义君 | Method and system for power allocation in multi-relay cooperative communication |
| CN102055565A (en) * | 2010-12-24 | 2011-05-11 | 清华大学 | Space diversity method for physical layer network coding in communication system |
| CN102355291A (en) * | 2011-07-18 | 2012-02-15 | 北京邮电大学 | Multithread bidirectional relay transmission method based on amplification forwarding |
| CN103532602A (en) * | 2012-07-05 | 2014-01-22 | 上海交通大学 | Antenna selection method and relay node |
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