CN107204826A - Towards the ADAPTIVE MIXED repeating method and device of deep space communication - Google Patents
Towards the ADAPTIVE MIXED repeating method and device of deep space communication Download PDFInfo
- Publication number
- CN107204826A CN107204826A CN201710201512.8A CN201710201512A CN107204826A CN 107204826 A CN107204826 A CN 107204826A CN 201710201512 A CN201710201512 A CN 201710201512A CN 107204826 A CN107204826 A CN 107204826A
- Authority
- CN
- China
- Prior art keywords
- module
- signal
- data
- parameter
- frame
- 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.)
- Pending
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
- H04L1/12—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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- 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
-
- 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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0637—Properties of the code
- H04L1/065—Properties of the code by means of convolutional encoding
-
- 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
-
- 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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1806—Go-back-N protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention discloses a kind of ADAPTIVE MIXED repeating method and device towards deep space communication, the device mainly includes rate adaptation and mixing retransmits two big key function modules, and its feature is：In communication process, sending and receiving end is using the autonomous retransmission for combining rollback N frames and the hybrid repeat method of convolutional encoding, to improve the transmission quality of system；Simultaneously for channel quality conditions it is poor when can influence the mixing retransmission efficiency under fixed rate, variable Rate strategy is added, so as to be adaptively adjusted transmission rate according to channel condition to obtain optimal throughput of transmissions.The present invention proposes the design method that a kind of automatic adjusument speed is combined with mixed automatic retransfer, solve influence of the time varying channel to data transmission performance during deep space communication, the number of retransmissions of system is reduced on the basis of data transmission efficiency is ensured, the highly efficient of data and high-quality transmission is realized.
Description
Technical field
The present invention is a kind of ADAPTIVE MIXED repeating method, belongs to communication technical field, more particularly to deep space communication background
It is used for the ADAPTIVE MIXED repeating method of proximity space communication link down.
Background technology
All the time, the transmission of signal would generally be various by interchannel noise, decay, interference etc. in a wireless communication system
The influence of factor, increases the uncertainty of communications, have impact on the efficiency of transmission and handling capacity of communications.Therefore when logical
, it is necessary to take technology for self-adaptively transmitting dynamically to adjust communication system parameter when letter link transmission is unstable, to ensure that information is passed
Defeated efficiency and quality；Meanwhile, on the premise of communication link is stablized without changing speed relatively, the transmittings of data also into
For one it is most important the problem of, increase mixing retransmission technique undoubtedly can further improve performance.
Compared to traditional terrestrial wireless communication, the channel conditions during deep space communication are complicated severe, when having very big
Denaturation and complexity, this receives the correct demodulation of signal by having a strong impact on, if especially when channel situation is deteriorated still with original
Speed is communicated, then can cause higher data errors.Therefore, under the system protocol based on current international norm, in order to the greatest extent
Possibly take the bit error rate of effective error-control technique reduction data transfer, while improving handling up for system as far as possible again
Amount, needs Transmission system adaptively to be adjusted according to channel status to improve efficiency of transmission, can rely on again during deep space communication
Autonomous retransmission technology is further ensured that the reliability of communication data.
The Proximity-1 consensus standards that Main Basiss international space data system Advisory Board of the present invention proposes are carried out
Shaken hands in design, communication process, number is passed and terminal procedure, frame format PLTU frames as defined in agreement, form is 24 bit synchronous
Head+the bit of data field+32 CRC check position, wherein data field is referred to as V-3 frames, can be divided into the SDU frames for carrying user data and carrying
The SPDU frames of the instructions such as state parameter.
The adaptive technique of the data transmission procedure of deep space communication is mainly change data speed in the present invention, can basis
The snr value of receiving terminal estimation reflects the signal transmission quality of current communications link, so as to improve or reduce transmission rate.
Meanwhile, often introduce phase fuzzy problem in the carrier synchronization process of receiving terminal, it is therefore desirable in rear class signal processing
In, the phase of demodulated signal is made decisions, corrects and exported utilization in correct result, the present invention using effective Given information
Specific synchronous head flag bit cooperates with correction phase ambiguity in Proximity-1 agreements.
The content of the invention
The technical problems to be solved by the invention are to overcome the transmission that time varying channel is brought during existing deep space communication
The problem of efficiency and transmission quality, for this problem, the present invention is designed and there is provided a kind of towards the adaptive of deep space communication
Hybrid repeat method and device.On the one hand, receiving terminal adaptively adjusts local and long-range receipts by estimating the signal to noise ratio of signal
The speed of hair machine, so as to ensure that system has the lower bit error rate and higher handling capacity under time varying channel；On the other hand, receive
Originator is employed with reference to rollback N frames and convolutional encoding, the autonomous retransmission technology of CRC check code, technical basis Proximiti-1
Protocol Design, takes into full account the difficulty or ease of system design and the performance realized, the further raising on the basis with compared with low time delay
The transmission quality of system.At the same time, a kind of ambiguity solution of combined frame synchronization is proposed based on Proximity-1 consensus standards
Algorithm, the algorithm has the time delay of very little, and real-time is high.
The present invention is adopted the following technical scheme that：
A kind of ADAPTIVE MIXED retransmission system towards deep space communication, it includes transmitting terminal and reception in data transmission link
End, the transmitting terminal includes re-transmission control module, emission control word extraction module, basic emission parameter adjusting module, data/ginseng
Array frame module, transmitting buffer module, emission rate control module, coding module and sending module；The receiving terminal includes connecing
Receive module, demodulation module, signal-to-noise ratio (SNR) estimation module, thresholding comparison module, decoding and correction verification module, receive control word extraction mould
Block, feeding back ACK or NACK signal module, substantially reception parameter adjustment module, receiving velocity control module；The transmitting terminal is retransmitted
The output of control module two-way is connected with transmitting buffer module, data/parameter framing module respectively, and transmitting buffer module output is with compiling
Code module is connected, and three outputs of emission control word extraction module adjust mould with re-transmission control module, basic emission parameter respectively
Block, emission rate control module are connected, two of basic emission parameter adjusting module outputs respectively with data/parameter framing mould
Block, coding module are connected, and the output of emission rate control module is connected with coding module, coding module output and sending module phase
Even；The receiving module output of the receiving terminal is connected with demodulation module, two of demodulation module export respectively with signal-to-noise ratio (SNR) estimation
Module, decoding correction verification module be connected, signal-to-noise ratio (SNR) estimation module output is connected with thresholding comparison module, thresholding comparison module export and
STATE FEEDBACK CONTROL word framing module is connected, decoding and two of correction verification module outputs respectively with feeding back ACK or NACK signal mould
Block, receive control word extraction module and be connected, two outputs for receiving control word extraction module receive parameter adjustment with basic respectively
Module, receiving velocity control module are connected, and the output of receiving velocity control module is connected with demodulation module.
Furthermore, the coding of the transmitting terminal, two modules of transmission can further comprise convolutional encoder module, CRC
Coding module, molding filtration module, orthogonal modulation module and interpolation multiple control module；The demodulation of the receiving terminal, decoding with
Correction verification module can further comprise abstraction module, FFT module, carrier synchronization module, sign synchronization module, decoding and ambiguity solution mould
Block and CRC check module；
Two inputs of convolutional encoder module of the transmitting terminal are respectively with launching buffer module, basic emission parameter adjusting module phase
Even, two inputs of CRC coding modules are connected with convolutional encoder module, basic emission parameter adjusting module respectively, CRC coding modules
Output is connected with molding filtration module, and the input of interpolation multiple control module is connected with emission rate control module, orthogonal modulation mould
Two inputs of block are connected with molding filtration module, interpolation multiple control module respectively；The receiving terminal abstraction module input with
Receiving module is connected, and abstraction module input is connected with FFT module, carrier synchronization module two input respectively with receiving velocity control
Module, FFT module are connected, and the output of carrier synchronization module is connected with sign synchronization module, two output difference of sign synchronization module
Be connected with signal-to-noise ratio (SNR) estimation module, decoding with ambiguity solution module, decoding and the output of ambiguity solution module two respectively with CRC check mould
Block, feeding back ACK/NACK signal module are connected, and the output of CRC check module is connected with receiving control word extraction module.
Furthermore, described decoding can further comprise phase rotation module, the first Viterbi with ambiguity solution module
Decoder, the second viterbi decoder and frame synchronization module；The decoding is inputted with the phase rotation module in ambiguity solution module
It is connected with sign synchronization module, two outputs of phase rotation module are translated with the first viterbi decoder, the second Viterbi respectively
Code device is connected, and frame synchronization module input is connected with the first viterbi decoder, the second viterbi decoder respectively, frame synchronization module
Output is connected with CRC check module.
Furthermore, described emission control word extraction module is used for the parameters for extracting emitter；Basic transmitting
Parameter adjustment module is used to adjust the modulation system of transmitting terminal, type of coding, frame length and retransmits the parameters such as mark；Retransmission control mould
Root tuber realizes that normal number is passed according to the transmitting buffering and data/parameter framing module of the re-transmission mark control transmitting terminal of extraction
The pattern switching of process and retransmission processes；Data/parameter framing module is used to bit data is carried out to meet deep space communication standard
Framing；Transmitting buffer module be used for store it is a collection of pending and sent but not confirmed reception frame；Emission rate is controlled
Module is used for the work clock for controlling the transmitter module of transmitting terminal and its adaptive of filter factor of described molding filtration cuts
Change；Coding and sending module are used to the data after framing carrying out convolutional encoding, CRC codings, molding filtration and modulation；Receive and
Demodulation module is used for analog-to-digital conversion and the demodulation of signal；Signal after sign synchronization is carried out signal to noise ratio and estimated by signal-to-noise ratio (SNR) estimation module
Meter, and thresholding comparison module is sent into, so as to map out corresponding adaptation rate value；Decoding is rolled up with correction verification module to data
Product decoding, the phase ambiguity processing of CRC check；Feeding back ACK/NACK signal module is used to generate the state correctly or incorrectly received
Mark；Receiving control word extraction module is used to extract every basic parameter required for receiving terminal；STATE FEEDBACK CONTROL word framing
For adaptation rate value and feeding back ACK/NACK signal to be generated to the frame for feeding back to transmitting terminal；Basic parameter adjusting module
Every basic parameter of receiving terminal is controlled；Receiving velocity control module is used to control the rate adaptation of receiving terminal to adjust
It is whole.
Furthermore, wherein convolutional encoder module uses (2,1,7) convolutional encoding, and it and CRC control modules are used for pair
Bit signal carries out convolutional encoding and 32 CRC codings；Molding filtration module is used to bit signal becoming baseband signal；It is orthogonal
Modulation module is used to baseband signal being multiplied by carrier modulation to intermediate frequency；Interpolation multiple control module is used for the letter under different rates
Identical sample rate is inserted in number；Abstraction module is used to the signal under identical sample rate being drawn into phase according to different receiving velocities
Answer sample rate；FFT module is used for the frequency for quickly estimating the single-carrier signal of deep space communication handshake phase, in order to carrier synchronization
Module can set more accurate initial synchronizing frequency；Carrier synchronization and sign synchronization module be used for the capture of carrier wave, tracking and
Regularly, and can be according to receiving velocity adaptive demodulation；Decoding is used for decoding and the ambiguity solution of convolutional encoding with ambiguity solution module；
CRC check module is used for the error detection that decoded data are carried out with check code.
Furthermore, wherein the first viterbi decoder and the second viterbi decoder are used to tie up two paths of signals
Spy is than decoding；Signal after sign synchronization is divided into two-way with the phase rotation module in ambiguity solution module and carries out 0 ° respectively by decoding
With 90 ° of phase place；Frame synchronization module carries out shiding matching according to the top guide of transmitting data, so that it is determined that valid frame.
The present invention have also been devised a kind of ADAPTIVE MIXED repeating method towards deep space communication, specific as follows：
(1) it is local and remote first to be sent out by fixed rate according to Proximity-1 protocol requirements during deep space communication
Initial parameter is sent and receives, then extraction is sent and received parameter configuration to corresponding module by receiving terminal and transmitting terminal, so that
Formal log-on data transmitting procedure；
(2) when data transfer is normally carried out, local data/parameter framing module is by after user data or state parameter framing
Feeding transmitting buffer module, fetches after the ack signal then then last consignment of data from transmitting buffer module are locally received；This
Ground receiving terminal carries out signal-to-noise ratio (SNR) estimation using the signal after sign synchronization, and the signal to noise ratio after estimation is compared with estimation thresholding,
Map out feeding STATE FEEDBACK CONTROL word framing module after corresponding adaptation rate value；Meanwhile, the signal after sign synchronization
Feeding decoding and correction verification module, and check results are mapped to ACK or NACK signal mark；
(3) after long-range CRC check module detects corrupt data, NACK signal can be generated and feed back to local, while remotely
Receiving terminal casts out the erroneous frame and its frame afterwards, is correctly received until next group retransmits the frame in data；Local transmitting terminal
Start re-transmission control module simultaneously map out be currently needed for retransmit frame number, after current window data are sent completely, it is upper once
The correct next frame for confirming to send starts to take out and send the data frame of a collection of length of window from transmitting buffer module；
(4) corresponding local transmitter speed extracted from the correct data Jing Guo CRC check module when local receiver, connect
Receipts machine speed and re-transmission indicate；When the local receiver speed of extraction is used to control the work of modules at local reception end
Clock, filter coefficient etc., so as to realize that adaptation rate switches；On the other hand the local hair of local transmitter speed feeding extracted
Control word extraction module is penetrated, the parameter of the modules for controlling local transmitting terminal, the working mechanism of remote transceiver is with this
Ground transceiver is consistent；The re-transmission of extraction then needs startup to locally retransmit control module when being masked as NACK signal, retransmit last consignment of
The user data frame not being properly validated.
(5) when locally needing transmission state parameter frame, local transmitting terminal interrupts ongoing data transmission procedure, will
Feeding transmitting buffer module in local feedback states and parameter framing insertion data frame, it is then encoded to join with transmitter module
Number is sent with feedback signal.
Beneficial effect：
1. the present invention proposes a kind of utilize and extracts state control information and adaptively switch transceiver operational clock, shaping filter
Ripple and matched filter coefficient and interpolation, the system schema of extracting multiple, can be achieved the adaptive switching of different rates.
2. the present invention proposes a kind of circuit side that phase ambiguity correction is carried out using top guide information based on frame synchronization
Formula, in the case of with convolutional encoding, the circuit sequentially passes through Wei Te after carrying out phase place to the signal after sign synchronization
Than decoding and frame synchronization process, phase fuzzy problem can be quickly and accurately corrected, is exchanged for very with the overhead for increasing relatively low
Low time delay, this is for needing higher real-time treatability to have good effect in deep space communication.
3. the present invention proposes a kind of association rate adaptively with rollback N frames and the autonomous retransmission with convolutional encoding
Technical scheme, makes full use of both advantages, and realizing higher data transfer with less Design of Digital Circuit complexity imitates
Rate and handling capacity.
Brief description of the drawings
Fig. 1 is overall system structure schematic diagram of the invention；
Fig. 2 is the implementation of sending and receiving end key modules；
Fig. 3 is decoding and ambiguity solution module implementation；
Fig. 4 is rate adaptation handoff algorithms structure chart；
Fig. 5 is mixing retransmission algorithm structure chart；
Fig. 6 is present system error performance and output signal-to-noise ratio relation；
Fig. 7 is present system handling capacity and Between Signal To Noise Ratio.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Referring to the drawings 1, embodiments thereof of the invention is as follows：
For transmitting terminal, wherein emission control word extraction module extracts the parameters of emitter, then matched somebody with somebody by post-module
Put the parameters such as modulation system, type of coding, frame length and the re-transmission mark of transmitting terminal；The speed control word extracted simultaneously is used to configure
Emission rate control module, and then it is adaptively adjusted the clock of transmitter module, molding filtration coefficient and interpolation multiple value.Wherein
Re-transmission control module controls the data or parameter framing of transmitting terminal according to the re-transmission mark of extraction, while controlling and realizing normal
Number is transmitted through journey and the pattern switching of retransmission processes.Wherein data/parameter framing module is used to meet bit data
The framing of Proximity-1 consensus standards, is then fed into transmitting buffer module and interim storage, when what is be currently transmitted
Frame receives the ack signal that receiver is fed back, then the data frame for continuing to remove a collection of length of window is sent.For receiving terminal,
Wherein the signal after sign synchronization is carried out signal-to-noise ratio (SNR) estimation by signal-to-noise ratio (SNR) estimation module, and sends into thresholding comparison module, so as to reflect
Project corresponding adaptation rate value.Wherein decoding carries out folding coding, the phase ambiguity of CRC check with correction verification module to data
Processing, Status Flag and its correspondence frame number that then feeding back ACK/NACK signal module is correctly or incorrectly received for generating.Its
The middle control word extraction module that receives is used to extract every basic parameter required for receiving terminal, then adjusts mould by basic parameter
Block is controlled to every basic parameter of receiving terminal, while receiving velocity can also be sent into receiving velocity control module, and then
It is adaptively adjusted the clock, matched filtering coefficient and extracting multiple value of the demodulation module of receiving terminal.
Referring to the drawings 1 and with reference to accompanying drawing 2, embodiment is as follows：
Wherein emission rate control module is mainly used in controlling the interpolation multiple in orthogonal modulation module, so as to realize not synchronized
There can be identical sample rate after modulates baseband signals intermediate frequency under rate.Wherein the abstraction module of receiving terminal, which has, adopts fixation
The effect of the sample rate under signal extraction to distinct symbols speed correspondence under sample rate, so as to ensure rear class carrier synchronization module
Middle matched filter can according to the change of speed adaptively changing.Wherein FFT module operates mainly in the list of handshake procedure
In the carrier wave stage, quickly estimated for the frequency deviation value to single carrier, be then sent to carrier synchronization module initialization carrier wave
Synchronous initial baseline value, so as to realize the quick and accurate capture of carrier synchronization module after the amount brought forward biography stage and synchronous.
Referring to the drawings shown in 3, the signal feeding phase rotation module after sign synchronization, respectively through 0 ° and 90 ° of phases after allowing
Carry out Viterbi decoding after the rotation of position simultaneously again, decoding result is exported to frame synchronization module, and frame synchronization module is utilized
Frame top guide information in Proximity-1 carries out shiding matching identification, finally will correctly recognize that valid data are exported.
For the ambiguity solution principle in the technology of the present invention, it can be described further：By taking qpsk modulation signal as an example, its synchronization
There can be four kinds of Fuzzy Phases after demodulation：(I, Q), (- Q, I), (- I ,-Q), (Q ,-I), respectively correspond to 0 °, 90 °, 180 ° and
270 °, according to QPSK modulation principles, (I, Q) and (- I ,-Q), (- Q, I) and (Q ,-I) complement code each other, and for convolutional code,
The complement code of each code word is also a code word of this yard, so if the signal after demodulation has 180 ° of phase ambiguities
When, viterbi decoder also can be decoded normally, and the bit data after only decoding negates for correct bit data, thus right
In above-mentioned four kinds of phase ambiguity situations, two groups can be further divided into：It is one group that 0 ° and 180 °, which is one group, 90 ° and 270 °,.Most
Afterwards, branch road is directly then negated into output if correct branch road has 180 ° of phase ambiguities after frame synchronization.
Referring to the drawings shown in 4, the algorithm structure of rate adaptation switching is specific as follows：
After starting working in " shaking hands " process of startup and normally, local receiver enters to its signal after multi tate is demodulated
Row signal-to-noise ratio (SNR) estimation, by the value of estimation with being contrasted with reference to thresholding, then judges corresponding speed gear, and with speed control
The form framing of word processed passes to remote parties, to realize the speed adjust of distance transmitter.Meanwhile, local receiver will receive number
State parameter in is extracted --- it is divided into transmitter parameter and receiver parameters, the transmitter parameter of extraction can switch this
Ground emitter speed, while can also add in " feedback states " module, the receiver parameters of extraction are then sent directly into local reception
In the multi tate demodulation module of machine, to switch the speed of local reception.After this place detects state parameter frame pending, stand
Stop the transmission of current-user data frame, state parameter frame is inserted into transmission troop and sent.
Referring to the drawings shown in 5, the algorithm structure retransmitted is mixed specific as follows：
Sender, which removes, to be done after corresponding coding enters sending mode to bit information, it is necessary to handle three types event：（1）
It is continuous with previous frame when receiving ack signal and frame number, then new data is pushed to buffer area, is delayed while the frame having been acknowledged is removed
Area is deposited, the variables such as frame number are correspondingly updated, timer is restarted when sending next frame.（2）When to NACK signal, then stop next
The transmission of frame, frame number S at that time is judged according to feedback, and retransmit after S it is all sent and not confirmed frame, while restarting meter
When device.（3）If timer expired, sender's re-transmission is all to have sent but has gone back the packet that not confirmed is crossed, and correspondingly also weighs
Open timer.And the workflow for receiving terminal is then relatively easy：（1）When the frame number received is S and correct, if upper one
The secondary frame number received is S-1, then recipient needs to send ack signal for S frames, and updates and next receive on demand
Frame number；If last frame number is not S-1, then recipient abandons the frame, and sends a correct received in-order recently
Frame ack signal.（2）When the frame number received is S but detection error, then a NACK signal is fed back, and for frame number
All cast out for the frame after S, until detect again re-transmission S frames and it is correct untill.
The present invention includes following steps towards the ADAPTIVE MIXED repeating method of deep space communication：
(1) during deep space communication, required according to proximity space link protocol Proximity-1, initial procedure, which starts, " holds
Hand " process, after shaking hands successfully, extraction is sent and received parameter configuration to corresponding module by receiving terminal and transmitting terminal, so that just
Formula log-on data transmitting procedure；
(2) during normal data transfer, local data/parameter framing module is by after user data or state parameter framing
Feeding transmitting buffer module, fetches after the ack signal then then last consignment of data from transmitting buffer module are locally received；This
Ground receiving terminal carries out signal-to-noise ratio (SNR) estimation using the signal after sign synchronization, and the signal to noise ratio after estimation is compared with estimation thresholding,
Map out feeding STATE FEEDBACK CONTROL word framing module after corresponding adaptation rate value；Meanwhile, the signal after sign synchronization
Feeding decoding and correction verification module, and check results are mapped to ACK or NACK signal mark；
(3) in error retransmission processes, long-range CRC check module is detected after corrupt data, can be generated NACK signal and be fed back
To local, while long-range receiving terminal casts out the erroneous frame and its frame afterwards, until next group, to retransmit the frame in data correct
Receive；Local transmitting terminal starts re-transmission control module and maps out the frame number for being currently needed for retransmitting, and is sent in current window data
After the completion of, start to take out from transmitting buffer module in the upper once correct next frame for confirming to send and send a collection of length of window
Data frame；
(4) in parameter extraction process, corresponding local transmitting is locally extracted from the correct data Jing Guo CRC check module
Machine speed, receiver speed and re-transmission mark；The local receiver speed of extraction is used for the modules for controlling local reception end
Work clock, filter coefficient etc., so as to realize that adaptation rate switches；On the other hand the local transmitter speed extracted is sent
Enter local emission control word extraction module, the parameter of the modules for controlling local transmitting terminal, the work of remote transceiver
Mechanism is consistent with local transceiver machine；The re-transmission of extraction then needs startup to locally retransmit control module when being masked as NACK signal, weight
Catch a collection of user data frame not being properly validated.
(5) during transmission state parameter frame, local transmitting terminal interrupts ongoing data transmission procedure, will be local
Feeding transmitting buffer module in feedback states and parameter framing insertion data frame, then it is encoded with transmitter module by parameter with
Feedback signal is sent.
Fig. 6 gives the present invention and 1 × 10 is met under designed system-6System error performance situation when noise
Than simulation curve (not considering that mixing is retransmitted), modulation system is QPSK, wherein output signal after the synchronization of output signal-to-noise ratio digit symbol
Signal to noise ratio.The contrast thresholding that signal-to-noise ratio (SNR) estimation module can be determined by figure is 15.5dB, according to this thresholding so as to tying
The snr value for closing estimation maps out corresponding rate adaptation value, and specific mapping method is the signal to noise ratio for estimating receiving terminal
Mathematic interpolation is done with threshold value, a 3dB is differed, just correspondingly lifts or reduce a few notch speed rates.
The relation that Fig. 7 gives adaptation rate and throughput of system and snr value in the case of two kinds of fixed rate is bent
Line, modulation system is QPSK, and the initial value of character rate is taken as 512bps.From the figure, it can be seen that within a period of time, base
It is higher than the throughput of system based on fixed rate in the throughput of system performance of rate adaptation.For rate adaptation system
System, it is when the signal-to-noise ratio (SNR) estimation value of signal is less than 15.5dB, then automatic to reduce transmission rate to ensure transmission quality；And work as signal
Signal-to-noise ratio (SNR) estimation value be more than 15.5dB when, then automatic lifting transmission rate is to realize more data transfers, and ensure that
The relatively low bit error rate.And use the system of fixed-rate transmission to change transmission rate in real time according to channel situation, can be because low
High rate data transmission under signal to noise ratio and influence transmission quality, or because the lower rate transmissions under high s/n ratio influence efficiency of transmission.
To sum up, the present invention is suitable for the communication protocol and scheme containing handshake procedure with synchronous top guide, especially such as
In the Proximity-1 agreements of deep space communication agreement.It is pointed out that described above is only the preferred embodiment of the present invention, it is right
For those skilled in the art, some improvement can also be made under the premise without departing from the principles of the invention,
These improve also this be considered as protection scope of the present invention.
Claims (8)
1. a kind of ADAPTIVE MIXED retransmission system towards deep space communication, it is characterised in that：
Including the transmitting terminal and receiving terminal in data transmission link, the transmitting terminal includes re-transmission control module, emission control word
Extraction module, basic emission parameter adjusting module, data/parameter framing module, transmitting buffer module, emission rate control mould
Block, coding module and sending module；The receiving terminal includes receiving module, demodulation module, signal-to-noise ratio (SNR) estimation module, thresholding and compared
Module, decoding and correction verification module, receive control word extraction module, feeding back ACK or NACK signal module, receive parameter adjustment substantially
Module, receiving velocity control module；
The transmitting terminal re-transmission control module two-way output is connected with transmitting buffer module, data/parameter framing module respectively, sends out
Buffer module output is penetrated with coding module to be connected, three of emission control word extraction module export respectively with re-transmission control module,
Basic emission parameter adjusting module, emission rate control module are connected, two output difference of basic emission parameter adjusting module
It is connected with data/parameter framing module, coding module, the output of emission rate control module is connected with coding module, coding module
Output is connected with sending module；The receiving module output of the receiving terminal is connected with demodulation module, two outputs of demodulation module
It is connected respectively with signal-to-noise ratio (SNR) estimation module, decoding correction verification module, the output of signal-to-noise ratio (SNR) estimation module is connected with thresholding comparison module, door
Limit comparison module output is connected with STATE FEEDBACK CONTROL word framing module, decoding and two of correction verification module export respectively with feedback
ACK or NACK signal module, receive control word extraction module and be connected, receive two outputs of control word extraction module respectively with base
This reception parameter adjustment module, receiving velocity control module are connected, and the output of receiving velocity control module is connected with demodulation module.
2. the ADAPTIVE MIXED retransmission system of deep space communication according to claim 1, it is characterised in that：
The coding of the transmitting terminal, send two modules and include convolutional encoder module, CRC coding modules, molding filtration module, just
Hand over modulation module and interpolation multiple control module；Demodulation, decoding and the correction verification module of the receiving terminal include abstraction module, FFT
Module, carrier synchronization module, sign synchronization module, decoding and ambiguity solution module and CRC check module；
Two inputs of convolutional encoder module of the transmitting terminal are respectively with launching buffer module, basic emission parameter adjusting module phase
Even, two inputs of CRC coding modules are connected with convolutional encoder module, basic emission parameter adjusting module respectively, CRC coding modules
Output is connected with molding filtration module, and the input of interpolation multiple control module is connected with emission rate control module, orthogonal modulation mould
Two inputs of block are connected with molding filtration module, interpolation multiple control module respectively；
The abstraction module input of the receiving terminal is connected with receiving module, and abstraction module input is connected with FFT module, carrier synchronization
Two inputs of module are connected with receiving velocity control module, FFT module respectively, the output of carrier synchronization module and sign synchronization module
It is connected, two outputs of sign synchronization module are connected with signal-to-noise ratio (SNR) estimation module, decoding with ambiguity solution module respectively, decoding and solution mould
Paste two outputs of module are connected with CRC check module, feeding back ACK/NACK signal module respectively, and CRC check module is exported with connecing
Control word extraction module is received to be connected.
3. the ADAPTIVE MIXED retransmission system of deep space communication according to claim 2, it is characterised in that：
Described decoding includes phase rotation module, the first viterbi decoder, the second viterbi decoder with ambiguity solution module
And frame synchronization module；The decoding is connected with the phase rotation module input in ambiguity solution module with sign synchronization module, phase
Two outputs of rotary module are connected with the first viterbi decoder, the second viterbi decoder respectively, frame synchronization module input
It is connected respectively with the first viterbi decoder, the second viterbi decoder, frame synchronization module output is connected with CRC check module.
4. the ADAPTIVE MIXED retransmission system of the deep space communication according to claim 1,2 or 3, it is characterised in that：
Described emission control word extraction module is used for the parameters for extracting emitter；Basic emission parameter adjusting module is used for
Adjust the parameters such as modulation system, type of coding, frame length and the re-transmission mark of transmitting terminal；Re-transmission control module is according to the re-transmission of extraction
The transmitting buffering and data/parameter framing module of mark control transmitting terminal, realize that normal number is transmitted through journey and retransmission processes
Pattern switching；Data/parameter framing module is used for the framing for bit data meet deep space communication standard；Transmitting buffering mould
Block be used for store it is a collection of pending and sent but not confirmed reception frame；Emission rate control module is used to control transmitting terminal
Transmitter module work clock and its described molding filtration filter factor adaptive switching；Coding and sending module are used
Data after by framing carry out convolutional encoding, CRC codings, molding filtration and modulation；Receive and demodulation module is used for signal
Analog-to-digital conversion and demodulation；Signal after sign synchronization is carried out signal-to-noise ratio (SNR) estimation by signal-to-noise ratio (SNR) estimation module, and is sent into thresholding and compared
Module, so as to map out corresponding adaptation rate value；Decoding carries out folding coding, CRC check with correction verification module to data
Phase ambiguity processing；Feeding back ACK/NACK signal module is used to generate the Status Flag correctly or incorrectly received；Receive control word
Extraction module is used to extract every basic parameter required for receiving terminal；STATE FEEDBACK CONTROL word framing is used for adaptation rate
Value and feeding back ACK/NACK signal generate the frame for feeding back to transmitting terminal；Every base of the basic parameter adjusting module to receiving terminal
This parameter is controlled；Receiving velocity control module is used to control the rate adaptation of receiving terminal to adjust.
5. the ADAPTIVE MIXED retransmission system of the deep space communication according to claim 1,2 or 3, it is characterised in that：
Convolutional encoder module and the CRC control module is used to carry out bit signal convolutional encoding and 32 CRC are encoded；Shaping
Filtration module is used to bit signal becoming baseband signal；Orthogonal modulation module is used to baseband signal being multiplied by carrier modulation in
Frequently；Interpolation multiple control module is used for the Interpolation of signals under different rates to identical sample rate；Abstraction module is used for phase
With the signal under sample rate corresponding sample rate is drawn into according to different receiving velocities；FFT module is used to quickly estimate deep space communication
The frequency of the single-carrier signal of handshake phase, in order to which carrier synchronization module can set more accurate initial synchronizing frequency；Carry
Ripple is synchronous and sign synchronization module is used for the capture, tracking and timing of carrier wave, and can be according to receiving velocity adaptive demodulation；Decoding
It is used for decoding and the ambiguity solution of convolutional encoding with ambiguity solution module；CRC check module is used to verify decoded data
The error detection of code.
6. the ADAPTIVE MIXED retransmission system of the deep space communication according to claim 1,2 or 3, it is characterised in that：
First viterbi decoder and the second viterbi decoder are used to carry out Viterbi decoding to two paths of signals；Decoding and solution mould
Signal after sign synchronization is divided into the phase place that two-way carries out 0 ° and 90 ° respectively by the phase rotation module in paste module；Frame
Synchronization module carries out shiding matching according to the top guide of transmitting data, so that it is determined that valid frame.
7. a kind of ADAPTIVE MIXED repeating method towards deep space communication, it is characterised in that comprise the following steps：
During deep space communication, according to Proximity-1 protocol requirements, it is local and remote first sent by fixed rate and
Initial parameter is received, then extraction is sent and received parameter configuration to corresponding module by receiving terminal and transmitting terminal, so that formally
Log-on data transmitting procedure；
When data transfer is normally carried out, local data/parameter framing module will be sent after user data or state parameter framing
Enter to launch buffer module, fetched after the ack signal then then last consignment of data from transmitting buffer module are locally received；Locally
Receiving terminal carries out signal-to-noise ratio (SNR) estimation using the signal after sign synchronization, and the signal to noise ratio after estimation is compared with estimation thresholding, reflected
Project feeding STATE FEEDBACK CONTROL word framing module after corresponding adaptation rate value；Meanwhile, the signal after sign synchronization is also sent
Enter decoding and correction verification module, and check results are mapped to ACK or NACK signal mark；
After long-range CRC check module detects corrupt data, NACK signal can be generated and feed back to local, while long-range receive
The erroneous frame and its frame afterwards are cast out in end, are correctly received until next group retransmits the frame in data；Local transmitting terminal starts
Re-transmission control module simultaneously maps out the frame number for being currently needed for retransmitting, after current window data are sent completely, upper once correct
Confirm that the next frame sent starts to take out and send the data frame of a collection of length of window from transmitting buffer module；
When local receiver extracts corresponding local transmitter speed, reception from the correct data Jing Guo CRC check module
After machine speed and re-transmission mark, when the local receiver speed of extraction is used to control the work of modules at local reception end
Clock, filter coefficient etc., so as to realize that adaptation rate switches；On the other hand the local hair of local transmitter speed feeding extracted
Control word extraction module is penetrated, the parameter of the modules for controlling local transmitting terminal, the working mechanism of remote transceiver is with this
Ground transceiver is consistent；The re-transmission of extraction then needs startup to locally retransmit control module when being masked as NACK signal, retransmit last consignment of
The user data frame not being properly validated；
When locally needing transmission state parameter frame, local transmitting terminal interrupts ongoing data transmission procedure, will be locally anti-
Feedback state and parameter framing insert feeding transmitting buffer module in data frame, and then encoded and transmitter module is by parameter and instead
Feedback signal is sent.
8. a kind of ADAPTIVE MIXED repeating method towards deep space communication, it is characterised in that the convolutional encoding is rolled up for (2,1,7)
Product coding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710201512.8A CN107204826A (en) | 2017-03-30 | 2017-03-30 | Towards the ADAPTIVE MIXED repeating method and device of deep space communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710201512.8A CN107204826A (en) | 2017-03-30 | 2017-03-30 | Towards the ADAPTIVE MIXED repeating method and device of deep space communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107204826A true CN107204826A (en) | 2017-09-26 |
Family
ID=59905587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710201512.8A Pending CN107204826A (en) | 2017-03-30 | 2017-03-30 | Towards the ADAPTIVE MIXED repeating method and device of deep space communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107204826A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306711A (en) * | 2018-01-02 | 2018-07-20 | 重庆邮电大学 | A kind of data frame based on LoRa quickly continuously transmits method |
| CN110913173A (en) * | 2019-10-30 | 2020-03-24 | 湖北大学 | Unmanned aerial vehicle image transmission system |
| CN110943810A (en) * | 2019-10-17 | 2020-03-31 | 南京航空航天大学 | Deep space communication-oriented rollback N-frame automatic retransmission method and system with variable sliding window length |
| CN110943752A (en) * | 2019-10-17 | 2020-03-31 | 南京航空航天大学 | OQPSK self-adaptive variable rate digital transceiver based on adjacent space link protocol |
| CN113055133A (en) * | 2021-03-11 | 2021-06-29 | 宸芯科技有限公司 | Hybrid automatic repeat request HARQ response method, device, equipment and medium |
| CN114337791A (en) * | 2022-01-05 | 2022-04-12 | 上海航天测控通信研究所 | Method for automatically establishing link for relay communication machine full duplex communication for Mars detection |
| CN115278705A (en) * | 2020-07-10 | 2022-11-01 | 展讯半导体(成都)有限公司 | Communication time sequence planning method, device, related equipment, storage medium and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7397774B1 (en) * | 2003-05-23 | 2008-07-08 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Downlink data multiplexer |
| CN105162735A (en) * | 2015-08-19 | 2015-12-16 | 南京航空航天大学 | Adaptive transmission device and adaptive transmission algorithm oriented to deep space communication |
-
2017
- 2017-03-30 CN CN201710201512.8A patent/CN107204826A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7397774B1 (en) * | 2003-05-23 | 2008-07-08 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Downlink data multiplexer |
| CN105162735A (en) * | 2015-08-19 | 2015-12-16 | 南京航空航天大学 | Adaptive transmission device and adaptive transmission algorithm oriented to deep space communication |
Non-Patent Citations (4)
| Title |
|---|
| 丁锐，杨知行，潘长勇: "《QPSK解调相位模糊度消除方法的改进》", 《现代通信理论与信号处理进展——2003年通信理论与信号处理年会论文集》 * |
| 李松，王成华，朱秋明，湖滨，张小飞，刘伟强: "《基于CCSDS的自适应传输系统设计及实现》", 《航空兵器》 * |
| 涂榫，高勇: "《标准卷积码在QPSK相位模糊下的研究》", 《通信技术》 * |
| 王文博: "《基于CCSDS_Proximity_1的自动重传系统设计与实现》", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306711A (en) * | 2018-01-02 | 2018-07-20 | 重庆邮电大学 | A kind of data frame based on LoRa quickly continuously transmits method |
| CN108306711B (en) * | 2018-01-02 | 2021-05-14 | 重庆邮电大学 | Data frame rapid continuous transmission method based on LoRa |
| CN110943810A (en) * | 2019-10-17 | 2020-03-31 | 南京航空航天大学 | Deep space communication-oriented rollback N-frame automatic retransmission method and system with variable sliding window length |
| CN110943752A (en) * | 2019-10-17 | 2020-03-31 | 南京航空航天大学 | OQPSK self-adaptive variable rate digital transceiver based on adjacent space link protocol |
| CN110913173A (en) * | 2019-10-30 | 2020-03-24 | 湖北大学 | Unmanned aerial vehicle image transmission system |
| CN115278705A (en) * | 2020-07-10 | 2022-11-01 | 展讯半导体(成都)有限公司 | Communication time sequence planning method, device, related equipment, storage medium and system |
| CN115278705B (en) * | 2020-07-10 | 2024-05-14 | 展讯半导体(成都)有限公司 | Communication time sequence planning method, device, related equipment, storage medium and system |
| CN113055133A (en) * | 2021-03-11 | 2021-06-29 | 宸芯科技有限公司 | Hybrid automatic repeat request HARQ response method, device, equipment and medium |
| CN114337791A (en) * | 2022-01-05 | 2022-04-12 | 上海航天测控通信研究所 | Method for automatically establishing link for relay communication machine full duplex communication for Mars detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107204826A (en) | Towards the ADAPTIVE MIXED repeating method and device of deep space communication | |
| US7526705B2 (en) | Acknowledgement message modification in communication networks | |
| CN100539482C (en) | The merging method and the receiver that mix automatic repeat requests in the ofdm system | |
| CN101136722B (en) | Data transmitting method and transmitting equipment suitable for high speed mobile terminal | |
| CN100555928C (en) | A kind of method of the automatic request retransmission of mixing based on OFDM | |
| CN102013966B (en) | Data packet retransmission method based on network coding | |
| CN104782072B (en) | Using the system and method for hybrid automatic repeat-requests agreements such as reliably stopping | |
| EP1304825A1 (en) | An adaptive hybrid retransmission method for wireless communications | |
| EP0948154A3 (en) | Data communication system and method using an hybrid ARQ scheme | |
| JP2000324161A (en) | Transmitter-receiver | |
| CN101919199B (en) | Packet decoding for H-ARQ transmission | |
| CN103647625B (en) | Link-based data reliable transmission method | |
| CN105847199B (en) | The method and device of PUSCH Channel Detection ACK/NACK state | |
| CN101286827A (en) | Packet transmission system and packet transmission method | |
| CN104660323A (en) | Rotor wing shielding resisting satellite communication method for helicopter | |
| CN110943810A (en) | Deep space communication-oriented rollback N-frame automatic retransmission method and system with variable sliding window length | |
| CN105391530A (en) | Satellite network reliable multicast method based on network coding | |
| CN104917590A (en) | Error correction method for channel coding | |
| CN104184568B (en) | The data transmission method and system of communication system | |
| CA2396213A1 (en) | Automatic retransmit request protocol for channels with time-varying capacity | |
| CN102315919B (en) | The method and apparatus that a kind of HARQ data merges | |
| CN101656604A (en) | Method and device for realizing hybrid automatic repeat request | |
| CN101409611B (en) | Communication method for IP scheduling | |
| CN101867439B (en) | Indication method of bit mapping mode | |
| CN1211916C (en) | Method and apparatus for symbol-estimation in a received signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170926 |
|
| RJ01 | Rejection of invention patent application after publication |