CN107294550A - It is a kind of to be sent and method of reseptance based on the slotted ALOHA system that interference is eliminated - Google Patents
It is a kind of to be sent and method of reseptance based on the slotted ALOHA system that interference is eliminated Download PDFInfo
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- CN107294550A CN107294550A CN201710438634.9A CN201710438634A CN107294550A CN 107294550 A CN107294550 A CN 107294550A CN 201710438634 A CN201710438634 A CN 201710438634A CN 107294550 A CN107294550 A CN 107294550A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15585—Relay station antennae loop interference reduction by interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
The invention discloses belong to a kind of of technical field of satellite communication to send and method of reseptance based on the slotted ALOHA system signal that interference is eliminated.This method includes initially setting up the reception model of CDMA slotted ALOHA, next to that the ALOHA system receives the method that the signal of model sends and received；Wherein, the signal of the reception model of CDMA slotted ALOHA each message in transmission process randomly chooses multiple time slots in a frame in and repeats to send, different messages, which randomly choose different training sequences, is used for receiving terminal synchronization, and the arrival time delay of each message is estimated by related operation in receiving terminal；Finally, using model progress interference elimination is received, each user message is recovered in the case where message collides so as to realize；This method is applied to slotted ALOHA system, and such as very high frequency(VHF) data exchange system VDES, satellite ship automatic identification system SAT AIS, satellite Internet of Things can significantly improve the capacity of slotted ALOHA system.
Description
Technical field
The invention belongs to technical field of satellite communication, more particularly to a kind of slotted ALOHA system hair eliminated based on interference
Send and method of reseptance.The time slot interference elimination algorithm of specifically a kind of slotted ALOHA system.
Background technology
Using ship automatic identification system (AIS), satellite very high frequency(VHF) data exchange system (VDES) and satellite internet as
CDMA slotted ALOHA agreement is applied in the satellite data exchange system of representative；ALOHA agreements belong to one kind of random storage agreement,
It is divided into pure ALOHA agreements and CDMA slotted ALOHA agreement.Wherein pure ALOHA agreements provide that the multi-access mode of different user is multiple for the time-division
With (TDMA) mode, i.e. transmission signal when each user has a transmitting message demand, if being properly received signal, receiving terminal is returned to
User confirms character (ACK), represents successful message receipt；If receiving terminal is received in the same time from two different users
Signal, then it is assumed that occur message transition collision, message can be caused to be properly received, receiving terminal feedback-less or return NACK signal,
Message sink failure is represented, each user at this moment occurring message transition collision waits certain time to re-start transmission, until message
Untill receiving successfully.The probability that message transition collision occurs when number of users is more for this cut-in method is very big, and message can be caused to block up
Plug.CDMA slotted ALOHA is that one kind of pure ALOHA agreements is improved, and in CDMA slotted ALOHA agreement, is defined using unified clock
Each user sends the time, when user has transmission message demand, it is necessary to wait next time slot proceed-to-send signal, by when
Message transition collision probability, can be reduced to the half of pure ALOHA agreements by the unification of clock.The message of CDMA slotted ALOHA agreement, which is sent, to be shown
It is intended to such as Fig. 1.
CDMA slotted ALOHA agreement is widely used in mobile phone mobile network, WIFI, ship automatic identification system (AIS) and satellite
In the systems such as very high frequency(VHF) data exchange system (VDES), carrier sense (CSTDMA) and self-organizing are frequently utilized that in ground network
(SOTDMA) mode reduces message transition collision probability and improves power system capacity.It is different but in satellite system, system delay is higher
User is apart from each other can not even not to be closed between horizon range, each user by way of intercepting carrier wave and reserving time slots
Reason distribution time slot simultaneously eliminates the interference that message transition collision is brought.It is therefore desirable to multi-user's collision alarm is carried out in DVB
Effectively eliminate interference.
The content of the invention
Sent and method of reseptance based on the slotted ALOHA system that interference is eliminated it is an object of the invention to provide a kind of；It is special
Levy and be, this method includes initially setting up the reception model of CDMA slotted ALOHA, next to that the ALOHA system receives the signal of model
Send the method with receiving；Wherein, the reception device composition of specific CDMA slotted ALOHA is memory and correlator, interference elimination, solution
Adjust series connection；Memory eliminates connection with interference again and local training sequence is connected with correlator；The reception model of CDMA slotted ALOHA
Signal using different training sequences to be used as receiving terminal at random in transmission process synchronous, pass through the same of training sequence in receiving terminal
Step estimates the distribution of each message in a slot；Each message is solved finally by interference elimination, so as to be touched having occurred message
Recover the message of each user in the case of hitting.
The CDMA slotted ALOHA receives the foundation of model, it is assumed that a frame length is N number of time slot in ALOHA agreements, in a frame
There is L user to send signal, slotted ALOHA system model is as follows：
The form of message that user sends：
S [i, n]=[strain[i],spayload[i],sguard]
Wherein s [i, n] represents transmission signal of i-th of the message in time slot n, and in a frame in, same user sends signal phase
Together, thus forThere is s [i, m]=s [i, n]=s [i]；strain[i] represents the training sequence of i-th of message,
The pattern of training sequence is in T1,T2,…TMMiddle random selection；spayload[i] represents that i-th of user needs the data message sent,
sguardFor protection interval, sguard=[0,0 ..., 0].
Receive reception signal waveform of the model in n-th of time slot：
Wherein δ [n] is the window function of n-th of time slot, i.e.,
Wherein slotn represents n-th of time slot, and others represents other time slots, Ak[i, n] is i-th of message in time slot n
The amplitude of signal, D [i, n] is signal transmission delay, and φ [i, n] is phase offset, and Δ ω [i, n] is the frequency deviation of signal, w (n)
For white Gaussian noise, its double-side band power spectral density is σw 2/2；
Model is received using matrix form description
R=Hs+w
Wherein r, to receive signal phasor, is matrix r=[r [1], r [2] ... the r [N]] of N × 1T：
S is transmission signal phasor
Wherein H is N × L matrix, represents the channel of communication system, H the i-th row jth column element Hij=h [i, j] is represented
I-th of time slot receive come and j-th of user message channel, delivered letters if j-th of user does not issue in i-th of time slot
Number then HijFor 0.
W is the white Gaussian noise vector that size is N × 1
Above formula has reacted the reception model of the CDMA slotted ALOHA under Gaussian channel.
Model is received based on above-mentioned ALOHA system, it is described to be sent and recipient based on the slotted ALOHA system that interference is eliminated
Method includes：
The step of signaling method, is as follows：
Step one：The encapsulation of completion message bag, makes message-length control in a time slot, more than the message of a time slot
It will send several times；
Step 2：Training sequence code character allowable is Ti, i=1,2 ... M, each training sequence pattern allowable are that length is M
PN codes or Walsh codes；Each message is random to select training sequence to be used as receiving terminal synchronization in training sequence code character allowable；
Step 3：Message selection sending time slots send signal, and wait receiving terminal to respond；
Step 4：When transmitting terminal does not receive receiving terminal at the appointed time to be responded, random selection time slot continues to send same
One message；Untill receiving receiving terminal back-signalling.
The step of signal acceptance method, is as follows：
Step one：Burst demodulation is carried out to the reception signal of each time slot, if CRC (CRC) verification is correct,
Then respond and confirm character；When colliding, CRC can verify failure, then do not give transmitting terminal feedback signal；It is same with this
When store all data r in a frame length；
Step 2：Set primary condition training sequence label i=1；
Step 3：Utilize training sequence TiEnter line slip to signal related, find out correlation peak location, storage relevant peaks
Number, peak, peak value size；
Step 4：Correlation peak location has following several situations, if only one relevant peaks, and the time slot has a letter
Number；Occur if there is multiple relevant peaks and multiple relevant peaks in identical time slot, then it is assumed that existed simultaneously by multiple different users
The signal of current time slots transmitting；If the signal of these time slots is done cross-correlation by the position of relevant peaks in different time-gap, if
There is peak value, then it is assumed that be same user repeats the signal that sends in different time-gap, otherwise it is assumed that being different user when different
The signal that gap is sent；It can be determined to use current training sequence user number L according to above-mentioned several situationsiWith each user transmitting
The time slot position n of signal；
Step 5：Work as i<During M, i=i+1, return to step three, as i=M, goes to step 6；
Step 6：The signal relevant peaks energy that user sends is estimated by the peak height of relevant peaks in step 3, passed through
Position, amplitude and the phase information of relevant peaks calculate the channel h [i, n] of message；Each signal that recycle step four is obtained
Transmission time slot position.The value of each nonzero element in channel H can be obtained；
Step 7：Using receive signal phasor r and channel H by following formula estimate primary signal s,
Step 8：To vectorIn often capable signal be demodulated, the data that demodulation result is met into CRC are stayed
Under, and to transmitting terminal feedback acknowledgment character (ACK), if CRC check fails, the time slot data are abandoned, and wait user to send out next time
Send；
Step 9：Store next frame data return to step two.
The up middle phenomenon proposition for occurring time slot collision of multi-user in system is directed to the beneficial effects of the invention are as follows this algorithm
The transmission of ALOHA system signal and method of reseptance.Suitable for sparse slotted-ALOHA channelv, such as satellite network, satellite ship are certainly
Dynamic identifying system (AIS), some satellite data exchange systems such as spaceborne very high frequency(VHF) data exchange system (VDES).Can be effectively
Reduce influence of the message transition collision to receptivity.
Brief description of the drawings
Fig. 1 is that CDMA slotted ALOHA receives the schematic diagram that message is distributed in Limited slot.
Fig. 2 is that the slotted ALOHA system signal based on interference elimination is sent and the structure of the reception device of method of reseptance is shown
It is intended to.
Fig. 3 is the flow chart of the interference cancellation algorithm based on CDMA slotted ALOHA.
Fig. 4 estimates the schematic flow sheet of channel so that 64 kinds of training sequences, training sequence pattern are PN codes as an example.
Embodiment
The present invention provides a kind of method that signal of slotted ALOHA system sends and received, and the algorithm includes CDMA slotted ALOHA
Reception model foundation and the ALOHA system model signal send with receive method；Wherein, signal is in transmission process
Be used as receiving terminal using different training sequences at random synchronous, receiving terminal by the synchronization of training sequence estimate each message when
Distribution in gap；Recover each message finally by interference elimination method, so as to recover in the case where having occurred message transition collision
The message of each user；It is explained below in conjunction with the accompanying drawings.
CDMA slotted ALOHA as shown in Figure 1 receives the schematic diagram that message is distributed in Limited slot.Illustrated in figure message A, B,
The distribution schematic diagram of C, D, E in different time-gap；Wherein as time slot N=7, the distribution schematic diagram of message in a frame during L=5,
The foundation of the reception model of CDMA slotted ALOHA assumes that a frame length is N=7 time slot in ALOHA agreements in the example, in a frame
In there is L=5 user to send signal, each user sends signal and repeated 2 to 3 times.
The reception model of CDMA slotted ALOHA is
R=Hs+w.
Wherein r is receives signal, and w is the white Gaussian noise vector that size is N × 1.
H is N × L matrix, represents the channel of communication system, H the i-th row jth column element Hij=h [i, j] is represented i-th
Individual time slot receives the channel from j-th of user message, if j-th of user not if i-th of time slot issues the number of delivering letters
HijFor 0；Situation H shown in Fig. 1 can be expressed as following form:
Example has reacted the reception model of the CDMA slotted ALOHA under Gaussian channel in above formula combination figure one, and Fig. 2, which is shown, to be based on
The reception device schematic diagram of the interference cancellation algorithm of CDMA slotted ALOHA.The reception device composition of specific CDMA slotted ALOHA for memory with
Correlator, interference are eliminated, demodulation series connection；Memory eliminates connection with interference again and local training sequence is connected with correlator.
Based on above-mentioned ALOHA system model,
It is described to be sent and reception including signal with method of reseptance based on the slotted ALOHA system signal transmission that interference is eliminated
Method：
The step of signaling method, is as follows：
The first step：The encapsulation of completion message bag, makes message-length control in a time slot, more than the message of a time slot
It will send several times；
Second step：64 64 PN codes or Walsh codes are locally generated as training sequence code character allowable.Each message with
It is synchronous that machine selects training sequence to be used as receiving terminal in training sequence code character allowable.
3rd step：Message selection sending time slots send signal, and wait receiving terminal to respond；
Step 4：When transmitting terminal does not receive receiving terminal at the appointed time to be responded, random selection time slot continues to send same
One message；Untill receiving receiving terminal back-signalling.
The signal acceptance method general frame such as figure two, the specific flow that receives is as shown in accompanying drawing three：
The first step：A frame signal is stored, for subsequent treatment.
Second step：By the signal of storage by correlator, point of flow estimation message in a slot as described in accompanying drawing four
Cloth situation, carries out related calculation processing first with training sequence and signal, and the relevant peaks that same training sequence is produced have following three
The situation of kind：If only one relevant peaks, there is a signal in the time slot；If there is multiple relevant peaks and multiple relevant peaks
Occur in identical time slot, then it is assumed that be the signal launched simultaneously in current time slots by multiple different users；If the position of relevant peaks
Put in different time-gap, then the signal of these time slots is done into cross-correlation, if there is peak value, then it is assumed that be same user when different
Gap repeats the signal sent, otherwise it is assumed that being the signal that different user is sent in different time-gap.And what different training sequences were produced
Relevant peaks are sent by different user.It can be determined to use current training sequence user number L according to above-mentioned several situationsiWith it is every
The time slot position n of individual user's transmission signal.
4th step：Estimate the channel that user sends by relevant peaks；Recycle the transmitting of each signal of correlator output
Time slot position.The value of each nonzero element in channel H can be obtained；
5th step：Using receive signal phasor r and channel H by following formula estimate primary signal s,
6th step：Result is eliminated to interferenceIn each signal be demodulated, demodulation result is met to the data of CRC check
Leave, and send feedback signal, if CRC check fails, the time slot data are abandoned, and wait user to send next time.
Claims (4)
1. a kind of sent and method of reseptance based on the slotted ALOHA system signal that interference is eliminated, it is characterised in that the algorithm includes
The reception model of CDMA slotted ALOHA is initially set up, next to that the ALOHA system receives the method that the signal of model sends and received；
Wherein, the reception device composition of specific CDMA slotted ALOHA is eliminated for memory with correlator, interference, demodulation is connected；Memory again and
Interference eliminates connection and local training sequence is connected with correlator；The signal of the reception model of CDMA slotted ALOHA is in transmission process
In to be used as receiving terminal using different training sequences at random synchronous, estimate that each message exists by the synchronization of training sequence in receiving terminal
Distribution in time slot；Each message is solved finally by interference elimination, so as to recover in the case where having occurred message transition collision each
The message of individual user.
2. a kind of according to claim 1 sent and method of reseptance based on the slotted ALOHA system signal that interference is eliminated, it is special
Levy and be, the foundation of the reception model of the CDMA slotted ALOHA a, it is assumed that frame length is N number of time slot in ALOHA agreements, in a frame
In there is L user to send signal, set up slotted ALOHA system receive model process it is as follows：
The form of message that user sends：
S [i, n]=[strain[i],spayload[i],sguard]
Wherein s [i, n] represents transmission signal of i-th of the message in time slot n, identical in the same user's transmission signal of a frame in, because
This forThere is s [i, m]=s [i, n]=s [i]；strain[i] represents the training sequence of i-th of message, trains sequence
The pattern of row is in T1,T2,…TMMiddle random selection；spayload[i] represents that i-th of user needs the data message sent, sguardFor
Protection interval, sguard=[0,0 ..., 0]；
Receive reception signal waveform of the model in n-th of time slot：
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This white noise, its double-side band power spectral density is σw 2/2；
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R=Hs+w
Wherein r, to receive signal phasor, is matrix r=[r [1], r [2] ... the r [N]] of N × 1T：
S is transmission signal phasor
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Wherein H is N × L matrix, represents the channel of communication system, H the i-th row jth column element Hij=h [i, j] is represented i-th
Individual time slot receive come and j-th of user message channel, if j-th of user not if i-th of time slot issues the number of delivering letters
HijFor 0；
W is the white Gaussian noise vector that size is N × 1
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Above formula has reacted the reception model of the CDMA slotted ALOHA under Gaussian channel.
3. a kind of according to claim 1 sent and method of reseptance based on the slotted ALOHA system signal that interference is eliminated, it is special
Levy and be, based on above-mentioned CDMA slotted ALOHA reception model signaling method the step of it is as follows：
Step one：The encapsulation of completion message bag, makes message-length control in a time slot, and the message more than a time slot will divide
Repeatedly send；
Step 2：Training sequence code character allowable is Ti, i=1,2 ... M, each training sequence pattern allowable are the PN codes that length is M
Or Walsh codes；Each message is random to select training sequence to be used as receiving terminal synchronization in training sequence code character allowable；
Step 3：Message selection sending time slots send signal, and wait receiving terminal to respond；
Step 4：When transmitting terminal does not receive receiving terminal at the appointed time to be responded, random selection time slot continues to send same disappear
Breath；Untill receiving receiving terminal back-signalling.
4. a kind of according to claim 1 sent and method of reseptance based on the slotted ALOHA system signal that interference is eliminated, it is special
Levy and be, based on above-mentioned CDMA slotted ALOHA reception model signal acceptance method the step of it is as follows：
Step one：Burst demodulation is carried out to the reception signal of each time slot, if CRC check is correct, ACK is responded；When touching
CRC check can fail when hitting, then do not give transmitting terminal feedback signal；At the same time all data r in a frame length are stored；
Step 2：Set primary condition training sequence label i=1；
Step 3：Utilize training sequence TiEnter line slip to signal related, find out correlation peak location, storage relevant peaks number, peak value
Position, peak value size；
Step 4：Correlation peak location has following several situations, if only one relevant peaks, and the time slot has a signal；
Occur if there is multiple relevant peaks and multiple relevant peaks in identical time slot, then it is assumed that be simultaneously current by multiple different users
The signal of slot transmission；If the signal of these time slots is done cross-correlation by the position of relevant peaks in different time-gap, if occurring
Peak value, then it is assumed that be the signal that same user repeats to send in different time-gap, otherwise it is assumed that being that different user is sent out in different time-gap
The signal sent；It can determine according to above-mentioned several situations and use current training sequence user number LiWith each user's transmission signal
Time slot position n；
Step 5：Work as i<During M, i=i+1, return to step three, as i=M, goes to step 6；
Step 6：The channel h [i, n] of each message is calculated by the position of relevant peaks, amplitude and phase information in step 3；Again
The transmission time slot position of each signal obtained using step 4；The value of each nonzero element in channel H can be obtained；
Step 7：Using receive signal phasor r and channel H by following formula estimate primary signal s,
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<mi>H</mi>
<mo>)</mo>
</mrow>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<msup>
<mi>H</mi>
<mi>T</mi>
</msup>
<mi>r</mi>
</mrow>
Step 8：To vectorIn often capable signal be demodulated, the data that demodulation result is met into CRC check leave, and to hair
Sending end feeding back ACK, if CRC check fails, the time slot data are abandoned, and wait user to send next time；
Step 9：Store next frame data return to step two.
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| CN113055863A (en) * | 2021-04-27 | 2021-06-29 | 北京理工大学 | Asynchronous non-orthogonal large-scale random access method for satellite Internet of things |
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