CN109246739A - The anti-interference method that remote signal is transmitted under sharing wireless channel - Google Patents
The anti-interference method that remote signal is transmitted under sharing wireless channel Download PDFInfo
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- CN109246739A CN109246739A CN201811107411.5A CN201811107411A CN109246739A CN 109246739 A CN109246739 A CN 109246739A CN 201811107411 A CN201811107411 A CN 201811107411A CN 109246739 A CN109246739 A CN 109246739A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0847—Transmission error
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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Abstract
The invention discloses the anti-interference methods that remote signal under a kind of sharing wireless channel is transmitted, for transmission of the remote signal under shared channel, a kind of channel interference signal appraisal procedure is defined, received signal strength and link-quality instruction are subjected to aggregative weighted, form new signal evaluation vector；It is for statistical analysis to signal evaluation vector, the confidence interval for interference signal occur is obtained in a probabilistic manner；Based on according to this, a kind of method that interference is reduced in shared channel is given.Compared with prior art, interfering with each other for radio signal in shared channel can be effectively reduced in the present invention, enhances the reliability of each remote signal, promotes the stability of whole system operation.
Description
Technical field
The present invention relates to the anti-interference methods that remote signal under a kind of sharing wireless channel is transmitted, and it is anti-dry to belong to wireless communication
Disturb technical field.
Background technique
Wireless communication can provide information service, for example make a phone call, pass by using wireless radio frequency transmissions information for people
Video passes data, or erects the bridge of transmitting information between equipment, realizes the transmitting of industrial equipment state information, far
Journey equipment wireless remote control or Internet of Things application etc..Wireless remote control signals, which can be used to control, all kinds of is equipped with wireless communication device
Electronic equipment, such as unmanned plane, model plane, industrial internet of things equipment etc..Since the radio frequency resources that can be used is limited
, and it is huge and ever-increasing for needing the information transmitted, so the high efficiency to frequency resource uses, is always
One of the important content, and the target pursued of radio communication professional research.
In the late three decades, the method for frequency effective use by frequency division multiplexing, time division multiplexing, code division multiplexing, develop to it is orthogonal
Frequency division multiplexing, dynamic comprehensive scheduling of resource etc., corresponding system design is by 2nd generation mobile communication evolution to the 5th third-generation mobile communication.
For the communication service of the feature with certain time, for example Speech Communication or video communication, frequency are efficiently drawn
Divide and is also required to certain time, and within this section of duration, the use of frequency is mostly (except the code division multiplexing) exclusively enjoyed,
Otherwise communication will receive interference and can not carry out information transmission.In this regard, mobile communication technology has been presented for numerous
Solution.
The communication service that (several seconds or shorter) very short for the duration are characterized, such as the communication of Internet of Things information or remote control
Information transmission etc., frequency resource is then seemed with the model split exclusively enjoyed extremely to be wasted, because the time of frequency of use may gesticulate
The time of crossover rate is also short, and efficiency is lower than 50%.For this communication service, hereinafter referred to as burst service, frequency is shared
The strategy of rate is a kind of more efficient use strategy.But it is various when one of the problem of shared channel resources are brought is exactly communications
Radio signal, which is easy to produce, to be interfered with each other, and will lead to information Transmission when serious, and then is made remotely-controlled equipment failure, lost
, there is consequence hard to predict in control.
The major programme that each subscriber signal interferes with each other under sharing wireless channel is solved at present, is based on WLAN skill
The channel access control program of art, the program is mainly used in the shared channel communication under short distance, small overlay environment, for length
Distance, a wide range of communication are then ineffective.In addition, the requirement for real-time communication, WLAN access technology is also difficult
It is competent.For example industrial Internet of Things or no-manned machine distant control etc. all have high requirements to the real-time of communication, under this requirement,
How sharing wireless channel is effective against interference, still lacks effective solution scheme at present.
Summary of the invention
The technical problems to be solved by the present invention are: transmission of the present invention for remote signal under shared channel, definition
Received signal strength and link-quality instruction are carried out aggregative weighted, are formed new by a kind of channel interference signal appraisal procedure
Signal evaluation vector；It is for statistical analysis to signal evaluation vector, the confidence area for interference signal occur is obtained in a probabilistic manner
Between；Based on according to this, a kind of method that interference is reduced in shared channel is given.
The present invention uses following technical scheme to solve above-mentioned technical problem:
The present invention proposes the anti-interference method that remote signal is transmitted under a kind of sharing wireless channel, includes the following steps:
(1), specific as follows to the appraisal procedure of interference signal:
(101), it is extracted from the wireless channel at place: time, received signal strength RSSI, link-quality instruction LQI, and
Thus three dimensional signal assessment vector S EV, SEV=SQRT (α * RSSI are obtained2+β*LQI2), wherein SQRT () is square root meter
It calculates, α, β are weighting coefficient, and alpha+beta=1；
(102), the synchronous code field in data packet format will be sent as training sequence, receiver receives each grouping
To training sequence calculate its three dimensional signal assessment vector S EV；
(103), confidence interval of the useful signal under certain percentage is obtained after counting, for exceeding confidence interval
SEV is determined as interference signal；
(2), it reduces reception signal and is disturbed degree, specific as follows:
(201), receiver is when receiving signal, and the step method according to (1) implements calculating to interference signal, system
Meter and assessment；
(202), it is defined as follows affirmation mechanism of shaking hands, between transmitter and receiver to realize to being properly received grouping
Confirmation, and the re-transmission to the data grouping that is interfered:
(a), transmitter makes confidence evaluation to shared channel first before sending data grouping；
(b), receiver carries out CRC check to each grouping, while SEV (i) is recorded and being counted；For passing through
The grouping of CRC check sends confirmation message ACK at once, so that transmitter sends next grouping；For not passing through CRC check,
But SEV (i) shows the grouping that probability of interference is lower than certain threshold value occur, sends message NAK, to allow transmitter to retransmit this point
Group；For not by CRC check, SEV (i) shows the grouping that probability of interference is higher than certain threshold value occur, message STOP is sent, with
Just it allows transmitter pause to send grouping, comes back to (a).
Further, anti-interference method of the present invention, in the step (101), received signal strength: RSSI=I2
+Q2, wherein I and Q is respectively receiver baseband digital in-phase and orthogonal output.
Further, anti-interference method of the present invention, in step (101), link-quality instruction: LQI=| T-S
|2, wherein T is received training symbol modulation constellation vector, and S is ideal Modulated constellation vector, and for frequency modulation(PFM), LQI is
The quadratic sum of frequency departure and phase deviation.
Further, anti-interference method of the present invention in step (103), sets 5% for confidence interval, calculates
When influence of the interference signal to useful signal is lower than 5%, average signal assesses vector: SEV (avr)=(SEV (1)+SEV (2)
+ ...+SEV (n))/n, signal evaluation vector mean value when this is undisturbed；
It counts respectively: SEV (i)/SEV (avr)≤1%, SEV (i) variation range when 2%, 3%, 4%, 5%
Obtain the confidence interval that interference is not affected by under these percentages, i=1,2 ... n, n are the quantity of grouping.
Further, anti-interference method of the present invention in step (103), sets 5% for confidence interval, calculates
When influence of the interference signal to useful signal is greater than 5%, average signal assesses vector: SEV (avr)=(SEV (1)+SEV (2)
+ ...+SEV (n))/n, this is signal evaluation vector mean value when being disturbed；
It counts respectively: SEV (i)/SEV (avr) >=5%, 6%, 7% ... 99%, the SEV (i) when 100% changes model
It encloses, can be obtained the confidence interval being interfered under these percentages, i=1,2 ... n, n are the quantity of grouping, Ji Keji
SEV (i) mean value and variation range when calculating and count in the presence of interference.
Further, anti-interference method of the present invention, in step (202), transmitter is first before sending data grouping
Confidence evaluation first is made to shared channel, refers to that providing channel occurs the report of corresponding interference with certain probability, if maximum probability
Event is interfered, then continues to monitor channel, sends grouping when interfering and disappearing.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
Interfering with each other for radio signal in shared channel can be effectively reduced in the present invention, and enhance each remote signal can
By property, the stability of whole system operation is promoted.
Detailed description of the invention
Fig. 1 is transmission data packet format of the invention.
Specific embodiment
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
The present invention proposes the anti-interference method that remote signal is transmitted under a kind of sharing wireless channel, specifically may include walking as follows
It is rapid:
(1) to the assessment of interference signal:
(1) three dimensional signal assessment vector (SEV): time, received signal strength is extracted from the wireless channel at place
(RSSI) and link-quality indicates (LQI).
Thus received signal strength formula can obtain: RSSI=I2+Q2, wherein I and Q is respectively receiver baseband digital in-phase
With orthogonal output.Link-quality instruction can obtain according to this: LQI=| T-S |2, wherein T is that received training symbol modulates star
Seat vector, S are ideal (predetermined) modulation constellation vector.For frequency modulation(PFM), which is the flat of frequency departure and phase deviation
Fang He.
Signal evaluation vector are as follows: SEV=SQRT (α * RSSI2+β*LQI2), SQRT () is square root calculating.α, β are weighting
Coefficient, and alpha+beta=1.
(2) synchronous code field in data packet format will be sent to receive each grouping as training sequence, receiver
Training sequence calculates its three dimensional signal assessment vector S EV.
(3) confidence interval of the useful signal under certain percentage is obtained after counting, for exceeding the SEV of confidence interval
It can be judged to interfering.
When calculating the influence when interference signal to useful signal lower than 5%, i.e. PJ/PSWhen≤5%, average signal assessment arrow
Amount: SEV (avr)=(SEV (1)+SEV (2)+...+SEV (n))/n, signal evaluation vector mean value when this is undisturbed；
It counts respectively: SEV (i)/SEV (avr)≤1%, SEV (i) variation range (and side when 2%, 3%, 4%, 5%
Difference), the confidence interval that interference is not affected by under these percentages can be obtained.
With same method, SEV (i) mean value and variance when can also calculate and count in the presence of interference.
(2) method that signal is disturbed degree that receives is reduced
(1) to the format design of transmission data grouping.
Usual packet format include prefix part (required), synchronization field (optional), address and control field (optional),
Several parts such as payload user data (required), check code (optional), synchronization field is required in the present invention, on the one hand as same
It walks head detection packet synchronization and captures situation, or verified as Subnet Identification；On the other hand, it is shown as training sequence and receives letter
Number degree being interfered.As shown in Figure 1, transmission data packet format of the invention are as follows: prefix, synchronization field, payload user data,
Check code.
Since training sequence is that transmitting-receiving is known altogether, locally generated, as ideal predetermined sequence and transmission can be subjected to, received
It carries out assessment being made to annoyance level according to (one) referring to comparison to interference training sequence.
From the point of view of packet format design, additional cost is not increased.
(2) when receiving signal to the calculating of interference signal, statistics and assessment.
According to the method that (one) describes, receiver can implement the assessment to interference signal while receiving signal.Greatly
Most systems (chip) can provide RSSI value, such as not provide RSSI value, also be convenient to be obtained by the method that (1) in (one) provides
?.The present invention only on the basis of RSSI value, and calculates link-quality indicated value LQI, is integrated to RSSI and LQI
Weighting, forms signal evaluation vector S EV；On this basis, and to SEV statistics and analysis has been carried out, when having obtained noiseless
The confidence interval for receiving signal, becomes the basic basis for judging whether to be interfered.
(3) transmitter and receiver operating protocol.
Affirmation mechanism of shaking hands is defined as follows between transmitter and receiver, to realize the confirmation to grouping is properly received, with
And the re-transmission to the data grouping that is interfered.
(a) transmitter makes confidence evaluation to shared channel first before sending data grouping, that is, provides channel with much
Probability occur it is much interference (dBm) report then continue to monitor channel if Great possibility interferes, interference disappear
When send grouping；
(b) receiver carries out CRC check to each grouping, while SEV (i) is recorded and being counted.For passing through CRC
The grouping of verification sends confirmation message ACK at once, so that transmitter sends next grouping；For not passing through CRC check, but
SEV (i) shows the grouping for probability of interference lower (such as lower than 5%) occur, sends message NAK, should to allow transmitter to retransmit
Grouping；For not by CRC check, SEV (i) shows the grouping for probability of interference higher (for example being higher than 5%) occur, message is sent
STOP comes back to (a) to allow transmitter pause to send grouping.
Specific embodiment:
Transceiver hardware can be designed by micro-control unit (MCU)+private communication block combiner, can also be by leading to
Logic array (FPGA) designed, designed is developed.Implementation of the invention is mainly completed by software.
Software design includes the following contents.
(1) data packet format of design carrying transmission information, is described by (1) in (two)；
(2) signal evaluation vector S EV is calculated, is described by (1) in (one)；
(3) SEV (i) for statisticalling analyze each grouping obtains this time communicating the confidence interval for interfering appearance under particular probability,
It is described by (3) in (one)；
(4) pause grouping is received when defining the protocol for receiving and dispatching confirmation of shaking hands, interfering, or severe jamming occur
Hair, avoids meaningless packet retransmission.Because the interference to shared channel can be further aggravated in the repeating transmission under interference environment.By
(2) (3) describe in.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. the anti-interference method that remote signal is transmitted under a kind of sharing wireless channel characterized by comprising
(1), specific as follows to the appraisal procedure of interference signal:
(101), it is extracted from the wireless channel at place: time, received signal strength RSSI, link-quality instruction LQI, and thus
Obtain three dimensional signal assessment vector S EV, SEV=SQRT (α * RSSI2+β*LQI2), wherein SQRT () is square root calculating, α, β
For weighting coefficient, and alpha+beta=1；
(102), the synchronous code field in data packet format will be sent as training sequence, receiver receives each grouping
Training sequence calculates its three dimensional signal assessment vector S EV；
(103), confidence interval of the useful signal under certain percentage is obtained after counting, for exceeding the SEV of confidence interval
It is determined as interference signal；
(2), it reduces reception signal and is disturbed degree, specific as follows:
(201), receiver is when receiving signal, the step method according to (1) implement calculating to interference signal, statistics with
Assessment；
(202), affirmation mechanism of shaking hands is defined as follows between transmitter and receiver, with realize to be properly received grouping really
Recognize, and the re-transmission to the data grouping that is interfered:
(a), transmitter makes confidence evaluation to shared channel first before sending data grouping；
(b), receiver carries out CRC check to each grouping, while SEV (i) is recorded and being counted；For passing through the school CRC
The grouping tested sends confirmation message ACK at once, so that transmitter sends next grouping；For not passing through CRC check, but SEV
(i) show the grouping that probability of interference is lower than certain threshold value occur, message NAK is sent, to allow transmitter to retransmit the grouping；For
Not by CRC check, SEV (i) shows the grouping that probability of interference is higher than certain threshold value occur, sends message STOP, sends out to allow
It penetrates machine pause and sends grouping, come back to (a).
2. anti-interference method according to claim 1, which is characterized in that in the step (101), received signal strength:
RSSI=I2+Q2, wherein I and Q is respectively receiver baseband digital in-phase and orthogonal output.
3. anti-interference method according to claim 1, which is characterized in that in step (101), link-quality instruction: LQI
=| T-S |2, wherein T is received training symbol modulation constellation vector, and S is ideal Modulated constellation vector, for frequency modulation(PFM),
LQI is the quadratic sum of frequency departure and phase deviation.
4. anti-interference method according to claim 1, which is characterized in that in step (103), set confidence interval to
5%, when calculating the influence when interference signal to useful signal lower than 5%, average signal assesses vector: SEV (avr)=(SEV
(1)+SEV (2)+...+SEV (n))/n, this for it is undisturbed when signal evaluation vector mean value；
Count respectively: SEV (i)/SEV (avr)≤1%, SEV (i) variation range when 2%, 3%, 4%, 5% can be obtained
It is not affected by the confidence interval of interference under these percentages, i=1,2 ... n, n are the quantity of grouping.
5. anti-interference method according to claim 1, which is characterized in that in step (103), set confidence interval to
5%, when calculating the influence when interference signal to useful signal greater than 5%, average signal assesses vector: SEV (avr)=(SEV
(1)+SEV (2)+...+SEV (n))/n, this is signal evaluation vector mean value when being disturbed；
It counts respectively: SEV (i)/SEV (avr) >=5%, 6%, 7% ... 99%, SEV (i) variation range when 100%, i.e.,
It can be obtained the confidence interval being interfered under these percentages, i=1,2 ... n, n are the quantity of grouping, can calculate and unite
SEV (i) mean value and variation range when counting out in the presence of interference.
6. anti-interference method according to claim 1, which is characterized in that in step (202), transmitter is sending data point
Confidence evaluation is made to shared channel first before group, refers to that providing channel occurs the report of corresponding interference with certain probability, if
Great possibility interferes, then continues to monitor channel, sends grouping when interfering and disappearing.
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| CN110942605A (en) * | 2019-12-30 | 2020-03-31 | 芜湖哈特机器人产业技术研究院有限公司 | Communication method for scheduling control |
| CN114071082A (en) * | 2021-11-05 | 2022-02-18 | 深圳蓝集科技有限公司 | Wireless image transmission system and method with anti-interference effect |
| WO2022067493A1 (en) * | 2020-09-29 | 2022-04-07 | 深圳市大疆创新科技有限公司 | Interference processing method, interference processing apparatus, and control device |
| CN116155667A (en) * | 2023-04-19 | 2023-05-23 | 深圳华龙讯达信息技术股份有限公司 | Anti-interference signal transmission processing system |
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