CN107070508A - The adaptive retransmission method of signal to noise ratio in cooperative communication network system - Google Patents
The adaptive retransmission method of signal to noise ratio in cooperative communication network system Download PDFInfo
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- CN107070508A CN107070508A CN201710119204.0A CN201710119204A CN107070508A CN 107070508 A CN107070508 A CN 107070508A CN 201710119204 A CN201710119204 A CN 201710119204A CN 107070508 A CN107070508 A CN 107070508A
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- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 238000007476 Maximum Likelihood Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000017105 transposition Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract description 9
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- 238000012545 processing Methods 0.000 abstract description 3
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000205 computational method Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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Abstract
The present invention relates to the adaptive retransmission method of signal to noise ratio in a kind of cooperative communication network system.According to real-Time Signal Transfer environment and channel condition, Soft Inform ation is obtained from the signal received using the adaptive method of estimation of signal to noise ratio；Transmit power is normalized via node, and sends the Soft Inform ation to receiving node；Receiving node detects the signal that the via node is sent using spherical detection algorithm.The present invention had both overcome the defect of amplification forwarding and decoding forwarding, and linear processing techniques is made full use of again, reduces algorithm complex when signal is obtained on via node, improves the real-time and efficiency of signal transmission.
Description
Technical field
The present invention relates to traffic communication field, and in particular to the signal to noise ratio in a kind of cooperative communication network system adaptively turns
Forwarding method.
Background technology
In cooperative communication network, one of key technology is transmission and the retransmission technique of signal.Two kinds of traditional cooperations turn
Forwarding method is that amplification forwarding and decoding are forwarded.Amplification forwarding is to realize a kind of collaboration protocols the simplest, via node only letter
Singly amplify and forward the signal from source node received, during amplification forwarding, receive the noise included in signal
It can be exaggerated.Decoding forwarding is complex, and first remove noise on via node forwards again, so as to overcome noise amplification effect
Should.But, the shortcoming of decoding retransmission method is：Once via node decoding error, will be forwarded to purpose by the signal of mistake
Node.
Existing patent document CN105490721A (denominations of invention：A kind of estimation of full duplex traffic cooperative communication network turns
Forwarding method, date of publication：2016.04.13) propose, via node uses Unconstrained (unconfined) least mean-square error
Algorithm sends the estimation Soft Inform ation of signal to obtain.This method can solve the problem that mainly for full duplex cooperative communication network
The defect of amplification forwarding and decoding forwarding is stated, but the realization of this method needs two transmission communication links in known full duplex network
Channel condition information (or channel information is obtained by channel estimation), therefore computational methods are complex, and in unknown letter
The error band property the come loss of energy because of channel estimation is possible in the case of channel state information.
The content of the invention
In order to solve above mentioned problem of the prior art, the present invention proposes the noise in a kind of cooperative communication network system
Than adaptive retransmission method, the defect of amplification forwarding and decoding forwarding was both overcome, has reduced again and signal is obtained on via node
When algorithm complex, improve signal transmission real-time and efficiency.
The present invention proposes the adaptive retransmission method of signal to noise ratio in a kind of cooperative communication network system, and this method includes：
Via node is according to real-Time Signal Transfer environment and channel condition, using the adaptive method of estimation of signal to noise ratio from connecing
Soft Inform ation (soft information) is obtained in the signal received.
Preferably, the adaptive method of estimation of the use signal to noise ratio obtains Soft Inform ation from the signal received, specifically
For：
Wherein,For Soft Inform ation,To use the signal that Linear Minimum Mean-Square Error Estimation method is obtained,To use
The signal that maximum likelihood estimate is obtained, ωoptFor the optimal value of auto-adaptive parameter, obtained by mathematical analysis：
Wherein, E represents mathematic expectaion, and ω is auto-adaptive parameter, and x is the signal that sending node is sent.
Preferably, it is describedFor the signal obtained using Linear Minimum Mean-Square Error Estimation method, specific method of estimation
For：
R=G1x+n1,
Wherein, G1For the channel condition information of sending node to via node, σ2For noise variance, I represents unit matrix, H
Conjugate transposition is represented, r is the signal that the via node is received, n1For the interchannel noise of sending node to via node.
Preferably, it is describedFor the signal obtained using maximum likelihood estimate, specific method of estimation is：
Wherein,The set of element is possible to by signal modulation symbol.
Preferably, transmit power is normalized the via node, and sends the soft letter to receiving node
Breath.
Preferably, the receiving node detects the signal that the via node is sent using spherical detection algorithm.
Preferably, the cooperative communication network system is a single aerial system and/or multiaerial system.
Preferably, in traffic cooperative communication network system, via node is the car-mounted terminal with collaboration communication function
And/or road side base station.
The present invention on via node according to real-Time Signal Transfer environment and channel condition, using signal to noise ratio estimating adaptively
Meter method obtains Soft Inform ation from the signal received；Transmit power is normalized via node, and is saved to receiving
Point sends the Soft Inform ation；Receiving node detects the signal that the via node is sent using spherical detection algorithm.The present invention
Both the defect of amplification forwarding and decoding forwarding had been overcome, linear processing techniques is made full use of again, has reduced and is obtained on via node
Algorithm complex during signal, improves the real-time and efficiency of signal transmission.
Brief description of the drawings
During Fig. 1 is the present embodiment, by the schematic diagram that once forwards in traffic collaboration communication；
During Fig. 2 is the present embodiment, by the schematic diagram that forwards twice in traffic collaboration communication.
Embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the technical principle of the present invention, it is not intended that limit the scope of the invention.
The present invention proposes the adaptive retransmission method of signal to noise ratio in a kind of cooperative communication network system, and this method includes：In
After node according to real-Time Signal Transfer environment and channel condition, using the adaptive method of estimation of signal to noise ratio from the signal received
Middle acquisition Soft Inform ation.
The present invention is applied to cooperative communication network system, including：Single antenna and multiaerial system.Due to cooperative communication network
In, the signal processing technology on via node is very crucial, the environment quickly moved in particular for vehicle in car networking, relaying
The reliability of nodes forward signals directly affects the transmission quality of signal between car and car, Che Yulu.In addition, traffic channel when
Denaturation and Doppler frequency shift are serious so that signal is disturbed with channel fading influence seriously, more highlights traffic collaboration communication
The importance of via node signal transacting and retransmission method in network.
Consider traditional amplification forwarding and the decoding respective shortcoming of retransmission method, signal to noise ratio proposed by the present invention is adaptive
Retransmission method is answered to obtain the systematic function better than both the above retransmission method, and without switching.Via node is received
Information from sending node, the adaptive Soft Inform ation of signal to noise ratio is carried out to it and is calculated, the forwarding of transmit power coefficient is adjusted afterwards
Give purpose vehicle node.
In the present embodiment, by taking traffic cooperative communication network system as an example, to illustrate method that signal to noise ratio is adaptively forwarded.Such as
Shown in Fig. 1, all car-mounted terminals and road side base station all have collaboration communication function, can be used as via node.Assuming that signal
By sending node VsSend, by via node V1After forwarding, by receiving node VdReceived, it is concretely comprised the following steps：
Step S1, sending node VsSend signal x；
Step S2, via node V1Signal is received, shown in the signal received such as formula (1)：
R=G1x+n1 (1)
Wherein, G1For sending node VsTo via node V1Channel condition information, n1For sending node VsTo via node
V1Interchannel noise；
Step S3, in via node V1On, by using signal to noise ratio adaptive estimation method, obtain Soft Inform ationSuch as formula
(2) shown in：
Wherein, ω is auto-adaptive parameter,For the signal obtained using Linear Minimum Mean-Square Error Estimation method, such as public affairs
Shown in formula (3)：
Wherein, σ2For noise variance, I represents unit matrix, and H represents conjugate transposition；
For using the signal of maximum likelihood estimate acquisition, such as formula (4) is shown：
Wherein,The set of element is possible to by signal modulation symbol；
For auto-adaptive parameter ω, its optimal value ω is obtained by the mathematical analysis shown in formula (5)opt：
Wherein, E represents mathematic expectaion；
Therefore, obtained Soft Inform ation is finally estimatedAs shown in formula (6)：
Step S4, via node V1Transmit power is normalized, and to receiving node VdSend the soft letter
Breath；
Step S5, receiving node VdSignal is received, shown in the signal received such as formula (7)：
Wherein, G2For the channel condition information of via node to receiving node, n2For the channel of via node to receiving node
Noise；
Step S6, receiving node obtains final signal using spherical detection algorithm, effectively reduces detection complexity.
As shown in Fig. 2 signal is from sending node VsAfter sending, successively by R1And V1The forwarding of the two via nodes, most
Afterwards just by receiving node VdReceived, its specific steps is similar with above-mentioned steps S1~step S6, it is simply to forwarded once more：
In sending node VsSend after signal, that be initially received signal is via node R1, in R1Upper use signal to noise ratio is certainly
Adapt to method of estimation and obtain Soft Inform ation, then to transmit power normalized, and send out；And then, via node V1
Signal is received, in V1Upper use signal to noise ratio adaptive estimation method obtains Soft Inform ation, then to transmit power normalized,
And send out；Finally by receiving node VdReceive signal.
As a same reason, may be by repeatedly forwarding when distant between sending node and receiving node, could most
Received eventually by receiving node.Wherein, all via nodes can be using the adaptive retransmission method of the signal to noise ratio of the present invention.
Those skilled in the art should be able to recognize that, the side of each example described with reference to the embodiments described herein
Method step, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate electronic hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with electronic hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.
Those skilled in the art can realize described function to each specific application using distinct methods, but this reality
Now it is not considered that beyond the scope of this invention.
So far, combined preferred embodiment shown in the drawings describes technical scheme, still, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (8)
1. the adaptive retransmission method of signal to noise ratio in a kind of cooperative communication network system, it is characterised in that this method includes：
Via node is according to real-Time Signal Transfer environment and channel condition, using the adaptive method of estimation of signal to noise ratio from receiving
Signal in obtain Soft Inform ation.
2. according to the method described in claim 1, it is characterised in that the adaptive method of estimation of the use signal to noise ratio is from reception
To signal in obtain Soft Inform ation, be specially：
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Wherein,For Soft Inform ation,To use the signal that Linear Minimum Mean-Square Error Estimation method is obtained,For using maximum
The signal that possibility predication method is obtained, ωoptFor the optimal value of auto-adaptive parameter, obtained by mathematical analysis：
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Wherein, E represents mathematic expectaion, and ω is auto-adaptive parameter, and x is the signal that sending node is sent.
3. method according to claim 2, it is characterised in that describedTo use Linear Minimum Mean-Square Error Estimation
The signal that method is obtained, specific method of estimation is：
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Wherein, G1For the channel condition information of sending node to via node, σ2For noise variance, I represents unit matrix, and H is represented
Conjugate transposition, r is the signal that the via node is received, n1For the interchannel noise of sending node to via node.
4. method according to claim 3, it is characterised in that describedFor the letter obtained using maximum likelihood estimate
Number, specific method of estimation is：
Wherein,The set of element is possible to by signal modulation symbol.
5. method according to claim 4, it is characterised in that the via node transmit power is normalized place
Reason, and send the Soft Inform ation to receiving node.
6. method according to claim 5, it is characterised in that the receiving node is using spherical detection algorithm to detect
State the signal that via node is sent.
7. according to method according to any one of claims 1 to 6, it is characterised in that the cooperative communication network system is single
Antenna system and/or multiaerial system.
8. according to method according to any one of claims 1 to 6, it is characterised in that in traffic cooperative communication network system,
Via node is car-mounted terminal and/or road side base station with collaboration communication function.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100195751A1 (en) * | 2009-02-05 | 2010-08-05 | Orlik Philip V | Method for Estimating Channels in Two-Hop MIMO AF Networks |
| CN204291405U (en) * | 2014-11-28 | 2015-04-22 | 东莞中国科学院云计算产业技术创新与育成中心 | A kind of low power consumption device realizing bus or train route communication |
| CN105490721A (en) * | 2015-10-30 | 2016-04-13 | 青岛智能产业技术研究院 | Estimate-forward method of full-duplex transportation cooperative-communication network |
| EP3101855A1 (en) * | 2014-02-26 | 2016-12-07 | Huawei Technologies Co., Ltd. | Signal processing method and base station |
-
2017
- 2017-03-02 CN CN201710119204.0A patent/CN107070508B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100195751A1 (en) * | 2009-02-05 | 2010-08-05 | Orlik Philip V | Method for Estimating Channels in Two-Hop MIMO AF Networks |
| EP3101855A1 (en) * | 2014-02-26 | 2016-12-07 | Huawei Technologies Co., Ltd. | Signal processing method and base station |
| CN204291405U (en) * | 2014-11-28 | 2015-04-22 | 东莞中国科学院云计算产业技术创新与育成中心 | A kind of low power consumption device realizing bus or train route communication |
| CN105490721A (en) * | 2015-10-30 | 2016-04-13 | 青岛智能产业技术研究院 | Estimate-forward method of full-duplex transportation cooperative-communication network |
Non-Patent Citations (1)
| Title |
|---|
| S. HAN等: "《Soft-Output Extension of an SNR-adaptive Sphere Decoder for Coded MIMO Systems》", 《2012 25TH IEEE CCECE》 * |
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