CN104601293B - Flight test telemetry radio transmitting method based on dynamic LDPC code rate - Google Patents
Flight test telemetry radio transmitting method based on dynamic LDPC code rate Download PDFInfo
- Publication number
- CN104601293B CN104601293B CN201510084903.7A CN201510084903A CN104601293B CN 104601293 B CN104601293 B CN 104601293B CN 201510084903 A CN201510084903 A CN 201510084903A CN 104601293 B CN104601293 B CN 104601293B
- Authority
- CN
- China
- Prior art keywords
- telemetry
- ldpc code
- sequence
- transceiver
- code rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
-
- 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
-
- 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
- H04L1/0063—Single parity check
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
Abstract
Flight test telemetry radio transmitting method based on dynamic LDPC code rate, is related to flight test telemetry radio transmitting method.The present invention is to solve the change of wireless transmission link penetration quality dynamic, the problem of causing telemetry data transmission efficiency and reliability not to be guaranteed.Pass through lot of experiments, when obtaining reliable and effective transmission, the mapping relations between wireless communication link quality and the code check of LDPC code；During practical communication, the telemetry block that airborne transceiver will be sent is divided into data sequence；At regular intervals, Current wireless communication link-quality is estimated；With reference to mapping relations, the code check of LDPC code corresponding to obtaining, LDPC codings and modulation are carried out to telemetry sequence, ground station transceiver is sent to by wireless radio frequency circuit, the ground station transceiver docking collection of letters number is demodulated to be decoded with LDPC, obtains telemetry estimate.The present invention is applied to telemetry field of wireless transmission in flight test.
Description
Technical field
The present invention relates to flight test telemetry radio transmitting method.
Background technology
Requirement and feature due to flight test, to gather aircraft of taking a flight test will be in the performance ginseng under be possible to flight environment of vehicle
Number, and assess the performance of aircraft flight.Therefore during aircraft flight test, the flying speed of high speed and the nothing of dynamic change
Line communication distance phenomenon make it that the wireless communication link quality between airborne transceiver and ground station transceiver is dynamic change
, the reliability and efficiency being wirelessly transferred to telemetry propose severe challenge.Therefore, the present invention proposes to be based on dynamic code rate
The wireless dynamic of test flight data of low-density checksum coding (Low-Density Parity Check Code, LDPC)
Transmission method, change the negative shadow brought to test data efficiency of transmission and reliability to solve wireless communication link penetration quality dynamic
Ring.
The content of the invention
It is that dynamic becomes the present invention is to solve the wireless communication link quality between airborne transceiver and ground station transceiver
Change, the problem of causing reliability that telemetry is wirelessly transferred and efficiency not to be guaranteed, and provide based on dynamic
The flight test telemetry radio transmitting method of LDPC code rate.
Flight test telemetry radio transmitting method based on dynamic LDPC code rate is realized according to the following steps：
First, in aircraft flight test, tested by the test to radio communication between airborne transceiver and ground station transceiver
Card obtains：In given signal to noise ratio snriIn the case of, LDPC code rate R during reliable wireless communicationi, it can thus be concluded that arriving signal to noise ratio snri
With LDPC code rate RiMapping relations M, with M={ (SNRi, Ri) represent, wherein i represents SNRiAnd RiSequence number, and 1≤i≤I,
I ∈ N, I are i maximum, and N represents integer set；Wherein, the LDPC code rate RiIt is that information digit n accounts for code length l after coding
Ratio, i.e. Ri=n/l；The reliable wireless communication refers to that the reception of communication can be properly received the number of sender of communications transmission
According to that is,：Ground station transceiver can be properly received the telemetry that airborne transceiver is sent；
2nd, the telemetry block to be sent is divided into the P telemetry sequence { S that length is n by airborne transceiver1,S2,
S3,...,Sj,...SP, j represents the sequence number of telemetry sequence, and 1≤j≤P, P are the total number of sequence, and its value is big
In 1 positive integer；And for each sequence Sj, have：Represent sequence SjIn k-th
Telemetry, k represent telemetrySequence number, and 1≤k≤n；
3rd, it is 0 that airborne transceiver, which sets its internal timer value, to the nothing between airborne transceiver and ground station transceiver
Line communication time duration starts timing：Airborne transceiver utilizes its internal channel estimator estimation Current wireless communication link
Quality, use signal to noise ratio snriThe height of wireless communication link quality, 1≤i≤I are represented, i ∈ N, N represent integer set；
4th, airborne transceiver is according to signal to noise ratio snriWith mapping relations M, it is determined that corresponding LDPC code rate Ri, airborne transceiver
Using SOQPSK modulation schemes to this LDPC code rate RiIt is modulated, the LDPC code rate carrier signal after being modulated；It is airborne
LDPC code rate carrier signal after modulation is converted into the first wireless signal by transceiver by its internal wireless radio frequency circuit, and
It is sent to ground station transceiver；Ground station transceiver receives the first wireless signal from airborne transceiver, and carries out SOQPSK
Demodulation, obtains LDPC code rate RiInformation；
5th, LDPC code rate R of the airborne transceiver in step 4iThe generator matrix G of LDPC code is obtained, in step 2
Length be n telemetry sequence1≤k≤n, 1≤j≤P carry out LDPC codings, such as
Shown in formula (1), the coding result sequence that length is l is generatedQ presentation code result sequences
CjMiddle dataSequence number, and 1≤q≤l, 1≤j≤P,Presentation code result sequence CjMiddle data, then, with reference to SOQPSK
Scheme is to coding result sequence CjIt is modulated, the coding result sequence carrier signal after being modulated；Finally by airborne receipts
Coding result sequence carrier signal after modulation is converted into second wireless singal by the wireless radio frequency circuit inside hair device, is sent to
Ground station transceiver；
Cj=Sj*G (1)
6th, ground station transceiver, after the second wireless singal for receiving step 5, SOQPSK demodulation is carried out to it, solved
Adjust resultAnd according to the generator matrix G of LDPC code, obtain corresponding check matrix H, root
According to check matrix H to demodulation resultThe decoding of LDPC code is carried out, so as to obtain telemetry sequence SjEstimate
7th, j=j+1 is made, airborne transceiver judges whether telemetry being sent, that is, judges whether j values are equal to P+
1：If so, then terminate this communication；Otherwise step 8 is performed；
8th, airborne transceiver judges whether the value of its timer internal reaches time t set in advance, if so, performing step
Rapid three；Otherwise, step 5 is performed.
Invention effect：
LDPC code：Low-density checksum coding (Low-Density Parity Check Code, LDPC)
Airborne transceiver obtains Current wireless communication link-quality per at regular intervals by link quality valuator
Estimate, the scheme suitably encoded with this dynamic select, Error Correction of Coding, and the shape for passing through less radio-frequency are carried out to telemetry
Formula is sent to earth station.So constantly circulation is gone down.So as to ensure that the functions reliably and efficiently rate of telemetry is transmitted.
(1) according to the height of communication link quality, dynamic adjusts encoder bit rate, also with regard to dynamically have adjusted effective biographies of data
Defeated efficiency.I.e. when link-quality is high, increase encoder bit rate, be also increased by effective efficiency of transmission of telemetry, realize remote measurement
The high-speed transfer of data.It is achieved thereby that the maximization of test flight data throughput of transmissions, relative to the LDPC code of classics, most
Height can improve handling capacity and reach 4 times；
(2) dynamic transmission mechanism when link-quality is low, reduces encoder bit rate, increases communication system used by invention
Error correcting capability, to obtain reliable telemetry data transmission.The reliability of communication is ensure that, i.e., ensure that flight examination to the full extent
Test the reliability of data transfer.
Mechanism proposed by the present invention can also be applied in other channel codings, such as convolutional code, on Turbo code.
The present invention is when radio link quality is high, using efficient transmission means；It is and low in radio link quality
When, using the transmission means of high reliability.Realize the high reliability and efficientibility that telemetry is wirelessly transferred.
Using：The present invention can be applied in fields such as the flight test telemetry double-direction radio transmission based on iNET standards
Close.
Brief description of the drawings
Fig. 1 is the workflow diagram of the present invention.
Embodiment
Embodiment one：The flight test telemetry based on dynamic LDPC code rate of present embodiment is wirelessly transferred
Method is realized according to the following steps：
First, in aircraft flight test, tested by the test to radio communication between airborne transceiver and ground station transceiver
Card obtains：In given signal to noise ratio snriIn the case of, LDPC code rate R during reliable wireless communicationi, it can thus be concluded that arriving signal to noise ratio snri
With LDPC code rate RiMapping relations M, with M={ (SNRi, Ri) represent, wherein i represents SNRiAnd RiSequence number, and 1≤i≤I,
I ∈ N, I are i maximum, and N represents integer set；Wherein, the LDPC code rate RiIt is that information digit n accounts for code length l after coding
Ratio, i.e. Ri=n/l；The reliable wireless communication refers to that the reception of communication can be properly received the number of sender of communications transmission
According to that is,：Ground station transceiver can be properly received the telemetry that airborne transceiver is sent；
2nd, the telemetry block to be sent is divided into the P telemetry sequence { S that length is n by airborne transceiver1,S2,
S3,...,Sj,...SP, j represents the sequence number of telemetry sequence, and 1≤j≤P, P are the total number of sequence, and its value is big
In 1 positive integer；And for each sequence Sj, have：Represent sequence SjIn k-th
Telemetry, k represent telemetrySequence number, and 1≤k≤n；
3rd, it is 0 that airborne transceiver, which sets its internal timer value, to the nothing between airborne transceiver and ground station transceiver
Line communication time duration starts timing：Airborne transceiver utilizes its internal channel estimator estimation Current wireless communication link
Quality, use signal to noise ratio snriThe height of wireless communication link quality, 1≤i≤I are represented, i ∈ N, N represent integer set；
4th, airborne transceiver is according to signal to noise ratio snriWith mapping relations M, it is determined that corresponding LDPC code rate Ri, airborne transceiver
Using SOQPSK modulation schemes to this LDPC code rate RiIt is modulated, the LDPC code rate carrier signal after being modulated；It is airborne
LDPC code rate carrier signal after modulation is converted into the first wireless signal by transceiver by its internal wireless radio frequency circuit, and
It is sent to ground station transceiver；Ground station transceiver receives the first wireless signal from airborne transceiver, and carries out SOQPSK
Demodulation, obtains LDPC code rate RiInformation；
5th, LDPC code rate R of the airborne transceiver in step 4iThe generator matrix G of LDPC code is obtained, in step 2
Length be n telemetry sequence1≤k≤n, 1≤j≤P carry out LDPC codings, such as
Shown in formula (1), the coding result sequence that length is l is generatedQ presentation code result sequences
CjMiddle dataSequence number, and 1≤q≤l, 1≤j≤P,Presentation code result sequence CjMiddle data, then, with reference to SOQPSK
Scheme is to coding result sequence CjIt is modulated, the coding result sequence carrier signal after being modulated；Finally by airborne receipts
Coding result sequence carrier signal after modulation is converted into second wireless singal by the wireless radio frequency circuit inside hair device, is sent to
Ground station transceiver；
Cj=Sj*G (1)
6th, ground station transceiver, after the second wireless singal for receiving step 5, SOQPSK demodulation is carried out to it, solved
Adjust resultAnd according to the generator matrix G of LDPC code, obtain corresponding check matrix H, root
According to check matrix H to demodulation resultThe decoding of LDPC code is carried out, so as to obtain telemetry sequence SjEstimate
7th, j=j+1 is made, airborne transceiver judges whether telemetry being sent, that is, judges whether j values are equal to P+
1：If so, then terminate this communication；Otherwise step 8 is performed；
8th, airborne transceiver judges whether the value of its timer internal reaches time t set in advance, if so, performing step
Rapid three；Otherwise, step 5 is performed.
Airborne transceiver described in step 4 is by its internal wireless radio frequency circuit by this LDPC code rate RiIt is sent to
Ground station transceiver is, it is necessary to first to encoder bit rate RiInformation carries out SOQPSK modulation, is then sent to by internal radio frequency circuit
Ground station transceiver, and transmission times is three times, code rate information to be properly received to ensure that ground station transceiver connects.Earth station receives and dispatches
Device uses SOQPSK demodulation modes, and the first wireless signal received is demodulated, so as to obtain encoder bit rate Ri。
Embodiment two：Present embodiment is unlike embodiment one：Set in the step 1
The information digit n of LDPC code is 4096bit, code check RiIt may be set to 1/4,1/3,2/5,1/2,2/3,3/4,4/5 and 1；
When code check R is 1, corresponding Airborne Telemetry data transmission efficiency is maximum；When code check R is 1/4, information digit n
Account for the 1/4 of code length l.Now, Airborne Telemetry data transmission efficiency is minimum, but error correcting capability is most strong, ensures reliable transmission；
According to the height of radio link quality, dynamic adjusts the code check of LDPC codings, realizes what telemetry was wirelessly transferred
Reliability and broadband transmission.
Other steps and parameter are identical with embodiment one.
Embodiment three：Present embodiment is unlike embodiment one or two：I takes in the step 1
It is worth for 8.
Other steps and parameter are identical with embodiment one or two.
Embodiment four：Unlike one of present embodiment and embodiment one to three：The step 6
Middle G and H meet H*GT=0 relation.
Other steps and parameter are identical with one of embodiment one to three.
Embodiment five：Unlike one of present embodiment and embodiment one to four：The step 8
Middle t spans are 2~10 seconds.
Other steps and parameter are identical with one of embodiment one to four.
Embodiment：
First, in aircraft flight test, tested by the test to radio communication between airborne transceiver and ground station transceiver
Card obtains：In given signal to noise ratio snriIn the case of the LDPC code rate R being wirelessly transferredi, it can thus be concluded that arriving signal to noise ratio snriWith LDPC
Code check RiMapping relations M, with M={ (SNRi, Ri) represent, wherein i represents SNRiAnd RiSequence number, and 1≤i≤I, i ∈ N, I
For i maximum, N represents integer set；Wherein, the LDPC code rate RiIt is the ratio that information digit n accounts for code length l after coding,
That is Ri=n/l；
Wherein, the M mapping relations：
| Signal to noise ratio snri | LDPC code rate Ri |
| 1 | 1/4 |
| 1.4 | 1/3 |
| 1.8 | 2/5 |
| 2.2 | 1/2 |
| 2.6 | 2/3 |
| 3.0 | 3/4 |
| 3.4 | 4/5 |
| 3.8 | 1 |
Information digit n is 4096 bits, I 8.
2nd, it is n=4096 P=1000 remote measurement that the telemetry block to be sent is divided into length by airborne transceiver
Data sequence { S1,S2,S3,...,Sj,...SP, S1,S2,S3,...,Sj,...SPIt is 1*4096 data sequence, j is represented
The sequence number of telemetry sequence, and 1≤j≤P, P are the total number of sequence, its value is the positive integer more than 1；And for each
Individual sequence Sj, have：Represent sequence SjIn k-th of telemetry, k represent telemetrySequence number, and 1≤k≤n；
3rd, it is 0 that airborne transceiver, which sets its internal timer value, to the nothing between airborne transceiver and ground station transceiver
Line communication time duration starts timing：Airborne transceiver utilizes its internal channel estimator estimation Current wireless communication link
Quality, use signal to noise ratio snriRepresent the height of wireless communication link quality, SNRi=2.2,1≤i≤I, i ∈ N；
4th, airborne transceiver is according to signal to noise ratio snriWith mapping relations M, it is determined that corresponding LDPC code rate Ri, airborne transceiver
Using SOQPSK modulation schemes to this LDPC code rate RiIt is modulated, the LDPC code rate carrier signal after being modulated；It is airborne
LDPC code rate carrier signal after modulation is converted into the first wireless signal by transceiver by its internal wireless radio frequency circuit, is sent out
Give ground station transceiver；Ground station transceiver receives the first wireless signal from airborne transceiver, and carries out SOQPSK solutions
Adjust, obtain LDPC code rate RiInformation；SNRi=2.2, then, according to M, obtain Ri=1/2；
5th, the coding code R of LDPC code of the airborne transceiver in step 4i=1/2iObtain the generator matrix G of LDPC code
For 4096*8192 matrix, the telemetry sequence to the length in step 2 for n=40961≤k≤n, 1≤j≤P carry out LDPC codings, and as shown in formula (1), generation length is l
=8192 coding result sequenceCjFor 1*8192 data sequence, q presentation code results
Sequence CjMiddle dataSequence number, and 1≤q≤l, 1≤j≤P,Presentation code result sequence CjMiddle data, then, with reference to
SOQPSK schemes are modulated to coding result sequence, the coding result sequence carrier signal after being modulated；Finally by machine
Carry the wireless radio frequency circuit inside transceiver and the coding result sequence carrier signal after modulation is converted into second wireless singal, send out
Give ground station transceiver；
Cj=Sj*G (1)
6th, ground station transceiver, after the second wireless singal for receiving step 5, SOQPSK demodulation is carried out to it, solved
Adjust resultAnd according to the generator matrix G of LDPC code, obtain corresponding check matrix H, root
According to check matrix H to demodulation resultThe decoding of LDPC code is carried out, so as to obtain telemetry sequence SjEstimate
Wherein, the Ri=1/2,For 1*8192 data sequence
G is 4096*8192 matrix, and H is 4096*8192 matrix
For 1*8192 data sequence,For 1*4096 data sequence
7th, j=j+1 is made, airborne transceiver judges whether telemetry being sent, that is, judges whether j values are equal to P+
1：If so, then terminate this communication；Otherwise step 8 is performed；
P+1=1001, as j=900, perform step 11；Work as j=1001, terminate communication；
8th, airborne transceiver judges whether the value of its timer internal reaches time t set in advance, if so, performing step
Rapid three；Otherwise, step 5 is performed.
T spans are 2~10 seconds, as t=4s, when the value of timer is equal to 2s, j increases by 1, perform step 5；Work as t
=4s, the value of timer are equal to 4s, then perform step 3.
Claims (5)
1. the flight test telemetry radio transmitting method based on dynamic LDPC code rate, it is characterised in that based on dynamic LDPC
The flight test telemetry radio transmitting method of code check is realized according to the following steps：
First, in aircraft flight test, obtained by the test checking to radio communication between airborne transceiver and ground station transceiver
：In given signal to noise ratio snriIn the case of, LDPC code rate R during reliable wireless communicationi, it can thus be concluded that arriving signal to noise ratio snriWith
LDPC code rate RiMapping relations M, with M={ (SNRi, Ri) represent, wherein i represents SNRiAnd RiSequence number, and 1≤i≤I, i
∈ N, I are i maximum, and N represents integer set；Wherein, the LDPC code rate RiIt is that information digit n accounts for code length l after coding
Ratio, i.e. Ri=n/l；The reliable wireless communication refers to that the reception of communication can be properly received the number of sender of communications transmission
According to that is,：Ground station transceiver can be properly received the telemetry that airborne transceiver is sent；
2nd, the telemetry block to be sent is divided into the P telemetry sequence { S that length is n by airborne transceiver1,S2,
S3,...,Sj,...SP, j represents the sequence number of telemetry sequence, and 1≤j≤P, P are the total number of sequence, and its value is big
In 1 positive integer；And for each sequence Sj, have： Represent sequence SjIn it is distant k-th
Data are surveyed, k represents telemetrySequence number, and 1≤k≤n；
3rd, it is 0 that airborne transceiver, which sets its internal timer value, to the channel radio between airborne transceiver and ground station transceiver
Letter time span starts timing：Airborne transceiver estimates the matter of Current wireless communication link using its internal channel estimator
Amount, uses signal to noise ratio snriThe height of wireless communication link quality, 1≤i≤I are represented, i ∈ N, N represent integer set；
4th, airborne transceiver is according to signal to noise ratio snriWith mapping relations M, it is determined that corresponding LDPC code rate Ri, airborne transceiver use
SOQPSK modulation schemes are to this LDPC code rate RiIt is modulated, the LDPC code rate carrier signal after being modulated；Airborne transmitting-receiving
LDPC code rate carrier signal after modulation is converted into the first wireless signal by device by its internal wireless radio frequency circuit, and is sent
Give ground station transceiver；Ground station transceiver receives the first wireless signal from airborne transceiver, and carries out SOQPSK demodulation,
Obtain LDPC code rate RiInformation；
5th, LDPC code rate R of the airborne transceiver in step 4iThe generator matrix G of LDPC code is obtained, to the length in step 2
Spend the telemetry sequence for n1≤k≤n, 1≤j≤P carry out LDPC codings, such as formula
(1) shown in, the coding result sequence that length is l is generatedQ presentation code result sequence CsjIn
DataSequence number, and 1≤q≤l, 1≤j≤P,Presentation code result sequence CjMiddle data, then, with reference to SOQPSK schemes
To coding result sequence CjIt is modulated, the coding result sequence carrier signal after being modulated；Finally by airborne transceiver
Coding result sequence carrier signal after modulation is converted into second wireless singal by internal wireless radio frequency circuit, is sent to ground
Station transceiver；
Cj=Sj*G (1)
6th, ground station transceiver, after the second wireless singal for receiving step 5, SOQPSK demodulation is carried out to it, obtains demodulation knot
FruitAnd according to the generator matrix G of LDPC code, corresponding check matrix H is obtained, according to school
Matrix H is tested to demodulation resultThe decoding of LDPC code is carried out, so as to obtain telemetry sequence SjEstimate
7th, j=j+1 is made, airborne transceiver judges whether telemetry being sent, that is, judges whether j values are equal to P+1：If
It is then to terminate this communication；Otherwise step 8 is performed；
8th, airborne transceiver judges whether the value of its timer internal reaches time t set in advance, if so, performing step 3；
Otherwise, step 5 is performed.
2. the flight test telemetry radio transmitting method according to claim 1 based on dynamic LDPC code rate, it is special
Sign is, the information digit n of LDPC code is set in the step 1 as 4096bit, code check Ri1/4,1/3,2/ can be set as
5,1/2,2/3,3/4,4/5 and 1；
When code check R is 1, corresponding telemetry radio transmission efficiency is maximum；When code check R is 1/4, information digit n accounts for code
The 1/4 of long l.
3. the flight test telemetry radio transmitting method according to claim 1 based on dynamic LDPC code rate, it is special
Sign is that I values are 8 in the step 1.
4. the flight test telemetry radio transmitting method according to claim 3 based on dynamic LDPC code rate, it is special
Sign is that G and H meet H*G in the step 6T=0 relation.
5. the flight test telemetry radio transmitting method according to claim 4 based on dynamic LDPC code rate, it is special
Sign is that t spans are 2~10 seconds in the step 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084903.7A CN104601293B (en) | 2015-02-16 | 2015-02-16 | Flight test telemetry radio transmitting method based on dynamic LDPC code rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084903.7A CN104601293B (en) | 2015-02-16 | 2015-02-16 | Flight test telemetry radio transmitting method based on dynamic LDPC code rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104601293A CN104601293A (en) | 2015-05-06 |
| CN104601293B true CN104601293B (en) | 2017-11-14 |
Family
ID=53126829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510084903.7A Active CN104601293B (en) | 2015-02-16 | 2015-02-16 | Flight test telemetry radio transmitting method based on dynamic LDPC code rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104601293B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109003618A (en) * | 2018-08-14 | 2018-12-14 | Oppo广东移动通信有限公司 | Coding control method, device, electronic equipment and storage medium |
| CN112448778B (en) * | 2020-11-23 | 2022-05-24 | 中国人民解放军63921部队 | Method and device for calculating demodulation time delay of ground remote measurement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1917399A (en) * | 2005-08-18 | 2007-02-21 | 北京泰美世纪科技有限公司 | Digital broadcasting satellite system, and information transmission method, error correction coding system and method |
| CN102664705A (en) * | 2012-04-03 | 2012-09-12 | 西北工业大学 | Aircraft data link adaptive encoding and modulation method |
| CN102891820A (en) * | 2011-07-19 | 2013-01-23 | 苏州东奇信息科技有限公司 | Adaptive receiver for variable-bit-rate EBPSK (Extended Binary Phase Shift Keying) communication system |
| CN103179617A (en) * | 2013-04-03 | 2013-06-26 | 北京航空航天大学 | Method, equipment and system for scheduling and distributing wireless resources of aeronautical mobile communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8340586B2 (en) * | 2008-11-19 | 2012-12-25 | T-Mobile Usa, Inc. | System and method for link adaptation for variable link conditions |
| KR101309615B1 (en) * | 2009-12-01 | 2013-09-23 | 한국전자통신연구원 | Source-channel association coding method and satellite broadcasting system using the same |
-
2015
- 2015-02-16 CN CN201510084903.7A patent/CN104601293B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1917399A (en) * | 2005-08-18 | 2007-02-21 | 北京泰美世纪科技有限公司 | Digital broadcasting satellite system, and information transmission method, error correction coding system and method |
| CN102891820A (en) * | 2011-07-19 | 2013-01-23 | 苏州东奇信息科技有限公司 | Adaptive receiver for variable-bit-rate EBPSK (Extended Binary Phase Shift Keying) communication system |
| CN102664705A (en) * | 2012-04-03 | 2012-09-12 | 西北工业大学 | Aircraft data link adaptive encoding and modulation method |
| CN103179617A (en) * | 2013-04-03 | 2013-06-26 | 北京航空航天大学 | Method, equipment and system for scheduling and distributing wireless resources of aeronautical mobile communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104601293A (en) | 2015-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102273298B (en) | A method and apparatus for encoding and decoding | |
| US8971435B2 (en) | Multi-user communication using sparse space codes | |
| CN102752092B (en) | Based on the satellite link adaptive transmission method of virtual hybrid automatic request retransmission | |
| US11258535B2 (en) | Method and apparatus for transmitting information | |
| US9253785B2 (en) | Multi-cell incremental redundancy | |
| US10887050B2 (en) | Downlink signal reception method and user equipment, and downlink signal transmission method and base station | |
| CN103957083B (en) | A kind of method and device for improving signaling frame transmission robustness | |
| CN107835063A (en) | Method, sending ending equipment and the receiving device of information transfer | |
| CN105049388B (en) | A kind of Shortwave Communication System and its transmission method based on fountain codes and single carrier frequency domain equalization | |
| US11139836B2 (en) | Information transmission method and transmission device, and information reception method and reception device | |
| CN102273300A (en) | multiple component carrier OFDMA communication system | |
| US20220278775A1 (en) | Communication apparatus and communication method for hybrid automatic repeat request transmission | |
| CN102111242B (en) | Method for reducing narrowband noise interference in power line carrier communication | |
| CN104601291B (en) | A kind of flight test remote measurement radio transmitting method based on adaptive LDPC coded modulations | |
| US20210075538A1 (en) | Method and apparatus for transmitting information, and method and apparatus for receiving information | |
| CN107750435B (en) | The device and method of non orthogonal transmissions | |
| EP4274129A1 (en) | Methods and apparatus for coding modulation and demodulation decoding | |
| CN104601293B (en) | Flight test telemetry radio transmitting method based on dynamic LDPC code rate | |
| CN104393955A (en) | ACK/NACK (Acknowledgement and Negative Acknowledgement) signal detection method and device | |
| Olmos et al. | On the use of mutual information at bit level for accurate link abstraction in LTE with incremental redundancy H-ARQ | |
| CN104243386A (en) | Additional channel information transmission method for multi-carrier communication system | |
| CN104753637B (en) | A kind of flight test telemetry radio transmitting method based on dynamic modulation mechanism | |
| CN103780362B (en) | Link performance prediction method and system based on MMIB in a kind of LTE system | |
| CN104168088B (en) | Spatial modulation method and device based on dual interleaving | |
| CN104618070B (en) | The flight test wireless two-way transmission method of the adaptive LDPC coded modulations calculated based on verification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |