CN108494530A - A kind of software radio data transmission system and transmission method based on LTE signals - Google Patents
A kind of software radio data transmission system and transmission method based on LTE signals Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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Abstract
The present invention relates to a kind of software radio data transmission systems and transmission method based on LTE signals, channel is divided into synchronizing channel, control channel, three kinds of different physical channels of data channel, and include transmitter and receiver two parts, transmitter and receiver is by analog radio frequency circuit, digital baseband circuit, digital control circuit three parts form, wherein transmitter is responsible for the transmitting of data and receiver is responsible for the receptions of data, both its coding and decoding scheme can by software flexible be configured, parameter configuration scheme, channel estimation and detection algorithm allocation plan etc..The present invention devises the hybrid access protocol HE TDMA of mixing a predistribution and random access feature simultaneously.Method and system provided by the present invention can be realized and the communication system built based on LTE signals is configured flexibly and is used, and enhance its application scenarios simultaneously.
Description
Technical field
The present invention relates to the communications field, especially a kind of software radio data transmission system based on LTE signals and
Transmission method.
Background technology
1.LTE signals.
LTE（Long Term Evolution, long term evolution）It is that the long-term of the UMTS technical standards formulated by 3GPP is drilled
Into physical layer includes OFDM（Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing）、
MIMO（Multi-Input ＆ Multi-Output, multiple-input and multiple-output）With space-time/space-frequency coding etc. key technologies, Neng Gouxian
It writes and improves system transfer rate.LTE and its Advanced Edition LTE-A is the core technology standard of current 4G mainstreams, physical layer skill
Art also will be important support of the following 5G systems in 6GHz or less frequency ranges, therefore have very important meaning to its research and development
Justice and foreground.
LTE system is divided according to its duplex mode, and can be divided into TDD-LTE（Time-division LTE）And FDD-LTE（Frequency division LTE）
Two kinds.Both standards are slightly different only on duplexing multiplex mode, and other aspects have no too big difference.In China,
Be subject to three headed by China Mobile big operation commercial cities mainly carries out the structures of 4G communication systems, therefore the present invention with TDD-LTE
Also it is designed based on TDD-LTE.
The frame format of TDD-LTE is：One frame length is 10ms, and per frame, there are two the fields that length is 5ms to form again；Often
A field includes 4 common subframes and 1 special subframe again, and the length of these subframes is 1ms；There are two long again for common subframe
The time slot that degree is 0.5ms forms, and special subframe is made of uplink pilot time slot, protection time slot, descending pilot frequency time slot three parts again,
Its specific frame structure is as shown in Figure 1.
For TDD-LTE system, it is an OFDM symbol to transmit unit minimum in the time domain, on frequency domain most
Small unit is an OFDM subcarrier.A running time-frequency resource list being made of an OFDM symbol and an OFDM subcarrier
Position, is referred to as a RE（Resource Element, resource particle）.In one time slot in all OFDM symbol and frequency domain
One group of running time-frequency resource unit of 12 sub- carrier wave compositions, is called a RB（Resource Block, resource block）.LTE physical layers
It is and to be the time-frequency money by as unit of RB by as unit of RE when doing resource impact when doing scheduling of resource
Source structure figure is as shown in Figure 2.Horizontal axis is time domain in Fig. 2 and the longitudinal axis is frequency domain, and TDD-LTE system is when carrying out data transmission
It is assigned in specific running time-frequency resource unit firstly the need of by data（This process is referred to as resource impact）, then sent out again
It penetrates.For TDD-LTE system, the resource of uplink and downlink is slightly different in the parameter configuration of standard,
But its basic structure is consistent, and the present invention is designed based on downlink standard.
2. software radio.
Different from all changeless legacy communications system of software and hardware, software radio is a kind of Reprogrammable, can weigh
The radio system of structure, i.e. software radio system, can be according to different need in the case where its system hardware need not change
It asks and completes different functions by loading different software.Software radio system fills on a general hardware platform
The technology using the repeatable programming of software is divided to be precisely controlled to modules to realize, to have the Reconfigurability of height
And flexibility, therefore once proposition, just obtain the extensive attention of the entire communications industry.
Since LTE system can have a variety of alternative coding and decoding schemes, parameter configuration scheme, channel estimation and detection to calculate
Method allocation plan etc., so if to carry out the design of transceiver communication device based on LTE signals, it is evident that software and radio technique
It is reasonable selection.All kinds of parameters for converting LTE system according to different communication scenes by software radio, can reach in this way
To the purpose preferably communicated.
3. multiple access technique.
Multiple access technique refers to the technology how multiple users establish wireless channel connection in wireless communications.Traditional
Multiple access technique includes two kinds of predistribution formula and random access formula.Predistribution formula access technology can distribute fixed frequency, when
Between, space, the resources such as code word, network node has a stable access chance, but the disadvantage is that these resources are often limited, is unfavorable for
The change and extension of network.Predistribution formula access technology is relatively specific for transmission time length, needs to stablize transmission bandwidth, network section
The case where point quantity can be estimated, such as cellular network.And radio access technology does not allocate resource in advance, network node can be random
Network channel is accessed, there is very strong flexibility and scalability, but is easy to happen data collision, transmission is unstable.It connects at random
Enter Technical comparing and is suitable for that transmission time is shorter, do not need long-time busy channel, network topology structure changes frequently, network section
The point unpredictable situation of quantity, such as wireless sense network.
The present invention in summary two kinds of situations, it is believed that access protocol had both needed the biography of stable transmission bandwidth safeguards system
Movement Capabilities, and need flexibly prolongable network topology structure, therefore propose the mixed of mixing predistribution and random access feature
Box-like extension TDMA agreements（Hybrid Extension TDMA, HE-TDMA）.
Invention content
In view of this, the purpose of the present invention is to propose to it is a kind of based on the software radio data transmission system of LTE signals with
And transmission method, it can be to the coding and decoding scheme of LTE system, parameter configuration scheme, channel estimation and detection algorithm allocation plan
Deng progress flexible configuration, this method proposes the hybrid extension TDMA agreements of mixing predistribution and random access feature simultaneously
HE-TDMA enables adaptation to increasingly complex wireless communications environment and occasion.
The present invention is realized using following scheme：A kind of software radio data transmission system based on LTE signals, including hair
Machine and receiver are penetrated, and channel is divided into synchronizing channel, the control channel physical channel different from three kinds of data channel；Wherein,
For the synchronizing channel to send and receive Network Synchronization data packet, the control channel accesses data packet, road to transmit MAC
By data packet, control packet, the data channel is carrying out data transmission；
The transmitter includes the first analog radio frequency circuit, the first digital baseband circuit, the first digital control circuit；Described first
Digital baseband circuit includes the baseband transmitter being located on different physical channels, and the first analog radio frequency circuit includes band logical filter
Wave device BPF, radio-frequency front-end and transmitting antenna；The digital control circuit includes the first arm processor, data distributor, the
One baseband parameter configurator and the first radio frequency parameter configurator, the arm processor receive the user from application layer and need
It asks, carrying out corresponding data transmitting by the first baseband parameter configurator and the first radio frequency parameter configurator according to user demand sets
The data set, and will sent simultaneously distribute to the baseband transmitter on different channels by data distributor；First number
Baseband transmitter in word baseband circuit receives the data from data distributor, and simultaneously according to the first baseband parameter configurator
Setting, to data stream carry out accordingly encode and modulate, and by the data modulated be sent into the first analog radio frequency circuit carry out
Transmitting；
The transmitter includes the second analog radio frequency circuit, the second digital baseband circuit, the second digital control circuit；Described second
Analog radio frequency circuit includes that reception antenna, radio-frequency front-end and bandpass filter BPF, second digital baseband circuit include
Band receiver of base on different physical channels, second digital control circuit include the second arm processor, the second radio frequency
Parameter configuration device, the second baseband parameter configurator and data receiver buffer；The second analog radio frequency circuit passes through first
The reception, demodulation and A/D that reception antenna carries out signal respectively on three kinds of channels are converted, and data flow is then sent into the second number
Word baseband circuit；Band receiver of base in second digital baseband circuit is to the data that are received from the second analog radio frequency circuit
It is set for demodulating and decoding accordingly according to the second baseband parameter configurator, and the data flow after demodulation is sent into data and is connect
It receives buffer further to be adjusted, the data flow after adjustment is re-fed into the second arm processor, the second digital control electricity
Data after road demodulates the second digital baseband circuit are sent to application layer, to complete entire data receiver flow.
Further, the transmitter uses double antenna transmit-receive structure with receiver.
Further, second digital control circuit can also receive user's request from application layer, and root simultaneously
It is asked according to these users to configure the second baseband parameter configurator and the second radio frequency parameter configurator.
The present invention also provides a kind of based on the software radio data transmission system described above based on LTE signals
Transmission method, specially：The baseband transmitter includes channel coding schemes configurator, code rate configurator, interweaving encoding
Arrangements device, source coding scheme configurator, layer mapping scheme and pre-coding matrix configurator, resource impact scheme and power
Assignment configuration device and first circulation prefix length configurator specifically include following steps in the baseband transmitter：
Step S11：The addition of CRC check position is carried out to the bit data to be transmitted first, cyclic redundancy check is attached to transmitted bit
The tail portion of data；
Step S12：Code block segmentation is carried out to the processed data of step S11, the data of input are matched according to channel coding schemes
The requirement for setting device is divided into the maximum input matched code block length of length with the channel coding schemes configurator, then divides again
Block carries out channel coding；
Step S13：Data after channel coding are subjected to Bit Interleave and rate-matched again；Wherein Bit Interleave use with
Machine interleaving scheme, deinterleaving method is configured by interweaving encoding arrangements device, to be suitable for unlike signal and different channels
Condition；It repeats or punches by carrying out bit to the data after channel coding and intertexture, to obtain and code rate configurator phase
Matched code rate；
Step S14：Data Jing Guo rate-matched are subjected to coding cascade, i.e., will again be closed by each code block of code block segmentation
And revert to continuous data flow；
Step S15：By the cascade code stream of code block system mitigating frequency-selective fading will be further increased by symbol interleaving
Ability；Wherein, the deinterleaving method of symbol interleaving is configured by interweaving encoding arrangements device；
Step S16：Specific operation will be carried out with scramble sequence by the code stream to interweave, completes Scrambling Operation, then carry out successively
Constellation mapping, layer mapping, carry out precoding, when tentatively obtaining meeting the orthogonal space of launch requirements to the code stream after layer maps
Or null tone code stream；Wherein, the orthogonal coding matrix that precoding uses is set by layer mapping scheme and pre-coding matrix configurator
It is fixed；
Step S17：Power distribution, time-frequency resource allocating are carried out to the code stream obtained after precoding, are inserted into pilot tone and framing behaviour
Make, design parameter is set by resource impact scheme and power distribution configurator；
Step S18：The code stream after framing will be completed to modulate by OFDM, i.e., serioparallel exchange, IFFT, add and cyclic prefix and go here and there
It after conversion operation, send to the first radio circuit and is emitted, complete baseband transmission work.
Further, the band receiver of base include second circulation prefix length configurator, resource impact arrangements device,
Channel estimation method selector, signal detection algorithm selector, solution layer mapping scheme and precoding decoding matrix configurator, information source
Decoding scheme configurator deinterleaves arrangements device, decoding rate configuration device and channel decoding arrangements device；The base
Include the following steps in band receiver：
Step S21：Data after being demodulated first from radio-frequency front-end carry out OFDM demodulation, i.e., serioparallel exchange, go cyclic prefix,
FFT, parallel-serial conversion operation, frame decoding is carried out by obtained code stream；Wherein the running time-frequency resource of frame decoding requires and frame structure is required by providing
Source mapping scheme configurator is set；
Step S22：The pilot signal obtained after frame decoding is obtained into the frequency response of channel by channel estimation method；Channel estimation
Algorithm is set by channel estimation method selector；
Step S23：The channel frequency response that step S22 is obtained carries out signal detection, when sky after being equalized or space-frequency code
Stream；Wherein signal detection algorithm is configured by signal detection algorithm selector；
Step S24：Step S23 is obtained into code stream successively by solution precoding reconciliation layer mapping, obtains new code stream；Wherein solution is pre-
Orthogonal coding matrix reconciliation layer mapping scheme needed for coding all by solution layer mapping scheme and precoding decoding matrix configurator into
Row parameter setting；
Step S25：The code stream that step S24 is obtained carries out source coding, that is, solves constellation mapping, decoding scheme is by source coding side
Case configurator is configured；The code stream after solution constellation mapping is subjected to descrambling code, solution symbol interleaving operation again；Wherein, symbol is solved
The specific method of intertexture reconciliation Bit Interleave is configured by deinterleaving arrangements device；
Step S26：The code stream that step S25 is obtained carries out code block segmentation, and the code stream after code block segmentation is carried out solution rate successively
Matching, solution Bit Interleave, channel decoding, tentatively obtain source code flow；Wherein the scheme of channel decoding passes through channel decoding scheme
Configurator is configured；
Step S27：Code stream after channel decoding is reverted into continuous bit stream using code block cascade, then using going to the schools CRC
The operation tested, finally obtains source code flow.
Further, the cut-in method of the system uses HE-TDMA agreements：Conventional frame is used under normal circumstances,
It needs to carry out to use superframe extension mechanism when point spread.
Further, extended method used by the superframe extension mechanism is：
Wherein, extended method is：The conventional frame of cut-in method is made of synchronization frame, control frame, N number of data frame；For
For the synchronization frame of regular frame, 8 different nodes can be distributed to by sharing 8 different time slots, and another there are two pilot frames, are used for
It is used with balanced as each node channel estimation of network internal；The time slot that the cut-in method is occupied according to node to each node into
The corresponding number of row, it is No. n-th node to occupy n-th of time slot, and using the minimum node of number as host node, other nodes
For from node；After node is assigned number, the time slot of identical number is used in subsequent control frame and data frame；Work as number of nodes
When amount is more than 8, one frame of HE-TDMA protocol extensions is attached to after regular frame, and extension frame possesses just the same with regular frame
Frame structure；If all nodes can't be accommodated after one extension, extend again.
Further, the node networking flow of the HE-TDMA agreements specifically includes following steps：
Step S31：When network will be added in node, which is intercepted first, is not taken office if intercepted whithin a period of time
What synchronizing information, then the node thinks that network is nearby not present, the node is oneself being set as No. 1 node, when occupying No. 1
Gap, and broadcast the synchronizing information of oneself in No. 1 slot timing of synchronization frame；If the node have receive other node send it is same
Information is walked, then enters step S32；
Step S32：The instruction that networks is sent in the response time slot of the control frame of host node, and judges whether to clash, if occurring
Conflict then sends the instruction that networks, if no conflict occurred, enters step S33 again after certain time-delay；
Step S33：Host node issues network access node distribution sky in the order sending time slots of control frame again after receiving networking instruction
Not busy time-gap number, automatic to extend a frame if present frame does not have free timeslot, network access node then occupies after obtaining this number
The time slot of this number completes networking work.
Further, the HE-TDMA agreements are synchronized in the laggard row clock of node networking, and wherein synchronous method includes from same
Footwork and external synchronization method；The wherein described external synchronization method is synchronized using the clock that satellite information system provides, and is HE-TDMA associations
The acquiescence synchronous method of view；After external synchronization method fails, HE-TDMA agreements start self-synchronizing method, the self-synchronizing method include with
Lower step：
Step S41：Carry out open loop synchronization：Host node is first in the synchronization time slot broadcast synchronization information frame of oneself, synchronizing information frame
Interior includes the host node synchronous base time, and receiving the synchronous base time from node resets the timer of oneself and main section
The synchronous base time of point is consistent, and is synchronized to complete open loop；
Step S42：Carry out closed-loop synchronization：From node on the basis of having completed open loop synchronization, broadcasted in its synchronization time slot
Its synchronizing information frame, this synchronizing information frame include the synchronous base time from node, and host node is receiving this from node
Fiducial time after be compared with the fiducial time of oneself, if the difference of the two be less than preset value if think to synchronously complete, it is no
Then time adjustment is being re-started from the synchronous response time slot of node transmission synchronous base time error to inform from node；From section
Its synchronizing information frame is broadcasted in its synchronization time slot again after point adjustment, step S42 is repeated, is less than until the two is only poor
Preset value.
Further, after HE-TDMA agreements complete time slot distribution and the synchronous working of system, the transmission of data is carried out；
Wherein, the transmission of the data includes the following steps：
Step S51：Sending node is transmitted in the order transmission time slot transmission data of control frame first asks, and receiving node receives this
After a order, responded accordingly in the response time slot of control frame；
Step S52：If sending node is only transmission order, terminate this operation；If sending node also needs to be ordered
Transmission is enabled, then receiving node is after the sending node data transmission subframes of data frame have received data, in the response of data frame
Gap is responded accordingly, completes a data transfer operation.
Compared with prior art, the present invention has following advantageous effect：
1, the present invention can be to the coding and decoding scheme of LTE system, parameter configuration scheme, channel estimation and detection algorithm allocation plan
Deng progress flexible configuration and system.
2, the present invention proposes the hybrid extension TDMA agreements HE- of mixing predistribution and random access feature simultaneously
TDMA enables adaptation to increasingly complex wireless communications environment and occasion.
Description of the drawings
Fig. 1 is the frame structure schematic diagram of TDD-LTE signals in background of invention.
Fig. 2 is the running time-frequency resource structure chart of TDD-LTE system in background of invention.
Fig. 3 is the transmitter principle block diagram designed by the embodiment of the present invention.
Fig. 4 is the receiver principle block diagram designed by the embodiment of the present invention.
Fig. 5 is the baseband transmitter functional block diagram designed by the embodiment of the present invention.
Fig. 6 is the band receiver of base functional block diagram designed by the embodiment of the present invention.
Fig. 7 is HE-TDMA protocol frames and the extension frame structure designed by the embodiment of the present invention.
Fig. 8 is the HE-TDMA synchronization frame structure of time slot designed by the embodiment of the present invention.
Fig. 9 is HE-TDMA control frames designed by the embodiment of the present invention, data frame interval structure.
Figure 10 is the HE-TDMA protocol node networking flows designed by the embodiment of the present invention.
Figure 11 is the HE-TDMA agreement motor synchronizing flows designed by the embodiment of the present invention.
Figure 12 is HE-TDMA protocol commands designed by the embodiment of the present invention, data transmission flow.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
The present embodiment provides a kind of software radio data transmission systems based on LTE signals, including transmitter and reception
Machine, and channel is divided into synchronizing channel, the control channel physical channel different from three kinds of data channel；Synchronizing channel is used for sending
With reception Network Synchronization data packet, control channel is used for transmitting MAC（Media Access Control, media access control）It connects
Enter data packet, routing data packet, command information packet etc., and data channel is then specifically used to carry out data transmission.Meanwhile this implementation
Example significantly improves system transfer rate using double antenna transmit-receive structure and space-time/space-frequency coding techniques.
As shown in figure 3, the transmitter of the present embodiment is by analog radio frequency circuit, digital baseband circuit, digital control circuit three
Part forms.Digital control circuit receives the user demand from application layer, passes through according to demand using ARM kernels as core
Baseband parameter configurator and radio frequency parameter configurator carry out corresponding data transmitting setting, and the data that will be sent simultaneously pass through
Data distributor distributes to the baseband transmitter on different channels.Digital baseband circuit is by baseband transmitter as core, base band
Transmitter receives the data from data distributor, and simultaneously according to the setting of baseband parameter configurator, and phase is carried out to data stream
The coding answered and modulation, and the data modulated feeding radio circuit is emitted.
As shown in figure 4, the receiver of the present embodiment is equally by analog radio frequency circuit, digital baseband circuit, digital control electricity
Road three parts composition.Radio circuit carries out reception, demodulation, the A/D conversion of signal respectively by antenna on three kinds of channels first,
Then data flow is sent into digital baseband circuit.Digital baseband circuit is using band receiver of base as core, to being received from radio circuit
To data be set for demodulating and decoding accordingly according to baseband parameter configurator, and by after demodulation data flow be sent into number
It is further adjusted according to order caching device, the data flow after adjustment is re-fed into digital control circuit.
As shown in figure 5, in the present embodiment, the baseband transmitter in transmitter first has to carry out the bit data of transmission
The addition of CRC check position, cyclic redundancy check are attached to the tail portion of transmitted bit data, and data flow is then carried out code block segmentation again.
The data of input according to the requirement of channel encoder, are divided into the maximum input length with the channel encoder by code block segmentation
The code block length matched, then piecemeal carries out channel coding again.The scheme of channel coding includes Turbo, LDPC, RS convolutional code etc.,
It is configured by channel coding configurator.Data after channel coding carry out rate-matched again through Bit Interleave.Bit
Interweave and use random interleaving scheme, specific deinterleaving method can be configured by interweaving encoding arrangements device, to be suitable for
Unlike signal and different channels condition.Rate-matched is repeated or is beaten by carrying out bit to the data after channel coding and intertexture
Hole, to obtain the code rate to match with code rate configurator.Then, then by the data Jing Guo rate-matched encode
Front is reconsolidated by each code block of code block segmentation, reverts to continuous data flow by cascade.Then, baseband transmission
Machine will further increase the ability of system mitigating frequency-selective fading by the cascade code stream of code block by symbol interleaving.Symbol is handed over
The specific deinterleaving method knitted is configured as the Bit Interleave of front by interweaving encoding arrangements device.It then, then will be through
It crosses the code stream to interweave and carries out Scrambling Operation, carry out specific operation with scramble sequence, complete Scrambling Operation, then reflected into planetary
It penetrates.Since the LTE modulation schemes supported include QPSK, 16QAM, 64QAM etc., it is therefore desirable to according to source coding scheme configurator
Setting the code word of input is mapped on corresponding planisphere.Then, then by code stream carry out layer mapping, layer mapping with later
Precoding according to LTE standard, groundwork is will to input the process that code word is mapped to transmitting antenna.Layer mapping is exactly will be defeated
Enter code word to be mapped on different layers.Layer mapping scheme has single antenna, spatial reuse, three kinds of transmission classification, specific mapping scheme
It is set by layer mapping scheme and pre-coding matrix configurator.Code stream after layer maps carries out precoding again, preliminary to obtain
To the orthogonal space-time/space-frequency code stream for meeting launch requirements.The orthogonal coding matrix that precoding module uses is also by layer mapping scheme
And pre-coding matrix configurator is set.The space-time/space-frequency code stream obtained after precoding must be according to the running time-frequency resource of LTE
It is required that and frame structure requirement, carry out power distribution, time-frequency resource allocating, be inserted into the operations such as pilot tone and framing, design parameter is by providing
Source mapping scheme and power distribution configurator are set.Complete framing after code stream modulated using OFDM, i.e., serioparallel exchange,
After the operations such as IFFT, addition cyclic prefix, parallel-serial conversion, send to radio circuit and emitted, so far complete entire baseband transmission
Work.Wherein the length of cyclic prefix is variable according to LTE standard, therefore need to be set by circulating prefix-length configurator
It sets.
As shown in fig. 6, in the present embodiment, the band receiver of base in receiver is first by the number after being demodulated from radio-frequency front-end
According to carry out OFDM demodulation, i.e., serioparallel exchange, go the operations such as cyclic prefix, FFT, parallel-serial conversion, obtained code stream carries out frame decoding again.
Running time-frequency resource in frame decoding requires and frame structure requires to be set by resource impact arrangements device.The pilot tone obtained after frame decoding
Signal obtains the frequency response of channel by channel estimation method.Channel estimation method includes LS（Least square）Algorithm, LMMSE
（Linear minimum mean-squared error）Algorithm etc. is set by channel estimation method selector.Then the channel frequency recycled
Rate response carries out signal detection, the space-time/space-frequency code stream after being equalized.Signal detection algorithm includes ZF（Force zero）Algorithm,
MMSE（Least mean-square error）Algorithm, solution SFBC（Solve Space Frequency Block Coding）Algorithm etc., specific detection algorithm are calculated by signal detection
Method selector is configured.Space-time/space-frequency code stream obtains new code stream using solution precoding reconciliation layer mapping.Solve precoding
Required orthogonal coding matrix reconciliation layer mapping scheme is all joined by solution layer mapping scheme and precoding decoding matrix configurator
Number setting.Then code stream carries out source coding via solution constellation mapping block again, since the LTE modulation schemes supported include
QPSK, 16QAM, 64QAM etc., therefore decoding scheme need to be configured by source coding arrangements device.After solving constellation mapping
Code stream carries out descrambling code, the operations such as solution symbol interleaving again.Again via code block segmentation, solution rate-matched, solution Bit Interleave, letter are carried out
Road decodes, and tentatively obtains source code flow.Solve symbol interleaving reconciliation Bit Interleave specific method by deinterleaving arrangements device into
Row setting, and the scheme of channel decoding includes Turbo decoders, ldpc decoder, RS Convolutional Decoder Assemblies etc., is translated by channel
Code arrangements device is configured.Code stream after channel decoding is cascaded using code block, reverts to continuous bit stream, then using
The operation for going CRC check, finally obtains source code flow.
On cut-in method, the HE-TDMA access type agreements designed by the present embodiment connect using mixing predistribution and at random
Enter the hybrid cut-in method of feature, use conventional frame under normal circumstances, needs to carry out to use when point spread super
Frame extension mechanism comes the reliability of safeguards system transmission time and the extended capability of network with this.Specifically：
The frame structure of HE-TDMA protocol conventions is as shown in fig. 7, under normal circumstances, the conventional frame of HE-TDMA agreements is by synchronizing
Frame, control frame, N number of data frame composition（N can freely be specified according to different business, be defaulted as 8）.Synchronization frame, control frame with
And the time slot of each data frame is divided according to the frame structure standard of TDD-LTE again.Therefore, for the synchronization frame of regular frame and
Speech, 8 different nodes can be distributed to by sharing 8 different time slots, and another there are two pilot frames, are used as network internal and respectively save
Point channel estimation and equalization is used.The time slot that HE-TDMA agreements are occupied according to node numbers it accordingly, occupies
1 time slot is No. 1 node, and it is No. 2 node to occupy the 2nd time slot, and so on, and to occupy No. 1 section
Point is host node, if No. 1 node is not present, using the minimum node of number as host node, other nodes are from node.Section
Point will also use the time slot of identical number once being assigned number in subsequent control frame and data frame.Due to HE-
The regular frame of TDMA agreements only has 8 different time slots, therefore can only accommodate 8 nodes, once number of nodes is more than 8, HE-
TDMA agreements will extend a frame and be attached to after regular frame.Extension frame possess with the duplicate frame structure of regular frame, if
All nodes can't be accommodated after one extension then to extend again, and so on, therefore the existing tradition of HE-TDMA agreements
The predistribution characteristic of TDMA, also has Stochastic propagation characteristic, is a kind of mixing extension TDMA agreements.
For the synchronization frame of TDMA agreements in addition to pilot frame, other time slots are all divided into two sub-slots, previous sub-slots hair
The synchronizing information of the numbered node, the latter sub-slots is given to send the synchronous response information of the numbered node.Synchronizing information it is interior
Appearance includes totalframes, current frame number, node serial number,
The information such as synchronous base time, synchronous response information are then used as the operations such as calibration response synchronization time.Node synchronizing information
It is the information that a timing is sent, such as 1 second primary, and synchronous response information is not then.The synchronous frame stucture of TDMA agreements is such as
Shown in Fig. 8.
The control frame of HE-TDMA and the structure of data frame are then consistent, including 8 assignable time slots and 2 pilot time slots,
The content of 2 pilot time slots is generated by host node, and order/number that the preceding half-slot of other 8 time slots is the numbered node
According to transmission subframe, rear half-slot is the response subframe of the numbered node, their frame structure is as shown in Figure 9.
In the present embodiment, as shown in Figure 10, when network will be added in node, which is intercepted first, such as
Fruit is intercepted whithin a period of time less than any synchronizing information, then the node thinks that network is nearby not present, then the node is certainly
Oneself is set as No. 1 node, occupies No. 1 time slot, and broadcast the synchronizing information of oneself in No. 1 slot timing of synchronization frame；If should
Node, which has, receives the synchronizing information that other node is sent, then sends the instruction that networks in the response time slot of the control frame of host node, main
Node issues network access node distribution free timeslot number in the order sending time slots of control frame again after receiving networking instruction, if
Present frame does not have free timeslot, then one frame of extension, network access node then smoothly occupy this number after obtaining this number automatically
Time slot completes networking work.Since HE-TDMA is using the method for the fixed time slot of distribution, the process that node networks is entire
The only possible process that data collision occurs of agreement, after data collision occurs, network access node can not receive host node transmission for a long time
Response, therefore inbound information can be retransmited afterwards for a period of time with random delay.
In the present embodiment, as shown in figure 11, after network is added in node, it is necessary to be synchronized by necessary clock to carry out
Clock alignment is to achieve the purpose that stable transmission data.The synchronous method of HE-TDMA agreements include self-synchronizing method with it is outer synchronous
Two kinds of method：The clock that external synchronization method is directly provided using the such as satellite information systems such as GPS, the Big Dipper synchronizes, and is HE-TDMA
The synchronous method of agreement acquiescence；And after external synchronization method fails, HE-TDMA will start self-synchronizing method.Self-synchronizing method refers to network
Internal node is realized by certain agreement with calibration measure autonomous synchronous.The motor synchronizing process of HE-TDMA is that open loop is same first
Step, i.e. host node include first host node synchronous base in the synchronization time slot broadcast synchronization information frame of oneself, synchronizing information frame
Time, from node receive this synchronous base time reset oneself timer and host node the synchronous base time keep
Unanimously, it is synchronized to complete open loop.But due to the influence of propagation delay time, the time slot for completing the node that open loop synchronizes may be still
It cannot be consistent with host node, and there are certain deviations, therefore also need to further complete closed-loop synchronization.The tool of closed-loop synchronization
Body way be from node completed open loop synchronize on the basis of, its synchronizing information frame is broadcasted in its synchronization time slot, this
A synchronizing information frame includes the synchronous base time from node, host node after receiving this fiducial time from node with oneself
Fiducial time be compared, think to synchronously complete if the difference of the two is less than certain value, if not if from node
Synchronous response time slot sends synchronous base time error and re-starts time adjustment to inform from node, after node adjusts
Its synchronizing information frame is broadcasted in its synchronization time slot again, is so recycled, until meeting closed-loop synchronization requirement, flow is as schemed
Shown in 11.
In the present embodiment, as shown in figure 12, after HE-TDMA agreements complete time slot distribution and the synchronous working of system,
It can be carried out the transmission of data.The data transmission of HE-TDMA is realized that control channel is used for transmitting by control frame and data frame
MAC accesses data packet, routing data packet, command information packet etc., and data channel is then used for carrying out data transmission.It is specifically flowed
Cheng Shi, sending node is transmitted in the order transmission time slot transmission data of control frame first asks, and receiving node receives this order
Afterwards, it is responded accordingly in the response time slot of control frame.If sending node is only transmission order, terminate this operation；
If sending node also needs to transmit into line command, receiving node has been received in the sending node data transmission subframes of data frame
It after data, is responded accordingly in the response time slot of data frame, completes a data transfer operation.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (10)
1. a kind of software radio data transmission system based on LTE signals, it is characterised in that：Including transmitter and receiver,
And channel is divided into synchronizing channel, the control channel physical channel different from three kinds of data channel；Wherein, the synchronizing channel is used
To send and receive Network Synchronization data packet, the control channel accesses data packet, routing data packet, control to transmit MAC
Packet, the data channel is carrying out data transmission；
The transmitter includes the first analog radio frequency circuit, the first digital baseband circuit, the first digital control circuit；Described first
Digital baseband circuit includes the baseband transmitter being located on different physical channels, and the first analog radio frequency circuit includes band logical filter
Wave device BPF, radio-frequency front-end and transmitting antenna；The digital control circuit includes the first arm processor, data distributor, the
One baseband parameter configurator and the first radio frequency parameter configurator, the arm processor receive the user from application layer and need
It asks, carrying out corresponding data transmitting by the first baseband parameter configurator and the first radio frequency parameter configurator according to user demand sets
The data set, and will sent simultaneously distribute to the baseband transmitter on different channels by data distributor；First number
Baseband transmitter in word baseband circuit receives the data from data distributor, and simultaneously according to the first baseband parameter configurator
Setting, to data stream carry out accordingly encode and modulate, and by the data modulated be sent into the first analog radio frequency circuit carry out
Transmitting；
The transmitter includes the second analog radio frequency circuit, the second digital baseband circuit, the second digital control circuit；Described second
Analog radio frequency circuit includes that reception antenna, radio-frequency front-end and bandpass filter BPF, second digital baseband circuit include
Band receiver of base on different physical channels, second digital control circuit include the second arm processor, the second radio frequency
Parameter configuration device, the second baseband parameter configurator and data receiver buffer；The second analog radio frequency circuit passes through first
The reception, demodulation and A/D that reception antenna carries out signal respectively on three kinds of channels are converted, and data flow is then sent into the second number
Word baseband circuit；Band receiver of base in second digital baseband circuit is to the data that are received from the second analog radio frequency circuit
It is set for demodulating and decoding accordingly according to the second baseband parameter configurator, and the data flow after demodulation is sent into data and is connect
It receives buffer further to be adjusted, the data flow after adjustment is re-fed into the second arm processor, the second digital control electricity
Data after road demodulates the second digital baseband circuit are sent to application layer, to complete entire data receiver flow.
2. a kind of software radio data transmission system based on LTE signals according to claim 1, it is characterised in that：
The transmitter uses double antenna transmit-receive structure with receiver.
3. a kind of software radio data transmission system based on LTE signals according to claim 1, it is characterised in that：
Second digital control circuit can also receive user's request from application layer simultaneously, and be asked according to these users to match
Set the second baseband parameter configurator and the second radio frequency parameter configurator.
4. a kind of biography based on software radio data transmission system of the claim 1-3 any one of them based on LTE signals
Transmission method, it is characterised in that：The baseband transmitter includes channel coding schemes configurator, code rate configurator, interweaves and compile
Code arrangements device, source coding scheme configurator, layer mapping scheme and pre-coding matrix configurator, resource impact scheme and work(
Rate assignment configuration device and first circulation prefix length configurator specifically include following steps in the baseband transmitter：
Step S11：The addition of CRC check position is carried out to the bit data to be transmitted first, cyclic redundancy check is attached to transmitted bit
The tail portion of data；
Step S12：Code block segmentation is carried out to the processed data of step S11, the data of input are matched according to channel coding schemes
The requirement for setting device is divided into the maximum input matched code block length of length with the channel coding schemes configurator, then divides again
Block carries out channel coding；
Step S13：Data after channel coding are subjected to Bit Interleave and rate-matched again；Wherein Bit Interleave use with
Machine interleaving scheme, deinterleaving method is configured by interweaving encoding arrangements device, to be suitable for unlike signal and different channels
Condition；It repeats or punches by carrying out bit to the data after channel coding and intertexture, to obtain and code rate configurator phase
Matched code rate；
Step S14：Data Jing Guo rate-matched are subjected to coding cascade, i.e., will again be closed by each code block of code block segmentation
And revert to continuous data flow；
Step S15：By the cascade code stream of code block system mitigating frequency-selective fading will be further increased by symbol interleaving
Ability；Wherein, the deinterleaving method of symbol interleaving is configured by interweaving encoding arrangements device；
Step S16：Specific operation will be carried out with scramble sequence by the code stream to interweave, completes Scrambling Operation, then carry out successively
Constellation mapping, layer mapping, carry out precoding, when tentatively obtaining meeting the orthogonal space of launch requirements to the code stream after layer maps
Or null tone code stream；Wherein, the orthogonal coding matrix that precoding uses is set by layer mapping scheme and pre-coding matrix configurator
It is fixed；
Step S17：Power distribution, time-frequency resource allocating are carried out to the code stream obtained after precoding, are inserted into pilot tone and framing behaviour
Make, design parameter is set by resource impact scheme and power distribution configurator；
Step S18：The code stream after framing will be completed to modulate by OFDM, i.e., serioparallel exchange, IFFT, add and cyclic prefix and go here and there
It after conversion operation, send to the first radio circuit and is emitted, complete baseband transmission work.
5. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 4,
It is characterized in that：The band receiver of base includes second circulation prefix length configurator, resource impact arrangements device, channel estimation
Algorithms selection device, signal detection algorithm selector, solution layer mapping scheme and precoding decoding matrix configurator, source coding scheme
Configurator deinterleaves arrangements device, decoding rate configuration device and channel decoding arrangements device；The band receiver of base
In include the following steps：
Step S21：Data after being demodulated first from radio-frequency front-end carry out OFDM demodulation, i.e., serioparallel exchange, go cyclic prefix,
FFT, parallel-serial conversion operation, frame decoding is carried out by obtained code stream；Wherein the running time-frequency resource of frame decoding requires and frame structure is required by providing
Source mapping scheme configurator is set；
Step S22：The pilot signal obtained after frame decoding is obtained into the frequency response of channel by channel estimation method；Channel estimation
Algorithm is set by channel estimation method selector；
Step S23：The channel frequency response that step S22 is obtained carries out signal detection, when sky after being equalized or space-frequency code
Stream；Wherein signal detection algorithm is configured by signal detection algorithm selector；
Step S24：Step S23 is obtained into code stream successively by solution precoding reconciliation layer mapping, obtains new code stream；Wherein solution is pre-
Orthogonal coding matrix reconciliation layer mapping scheme needed for coding all by solution layer mapping scheme and precoding decoding matrix configurator into
Row parameter setting；
Step S25：The code stream that step S24 is obtained carries out source coding, that is, solves constellation mapping, decoding scheme is by source coding side
Case configurator is configured；The code stream after solution constellation mapping is subjected to descrambling code, solution symbol interleaving operation again；Wherein, symbol is solved
The specific method of intertexture reconciliation Bit Interleave is configured by deinterleaving arrangements device；
Step S26：The code stream that step S25 is obtained carries out code block segmentation, and the code stream after code block segmentation is carried out solution rate successively
Matching, solution Bit Interleave, channel decoding, tentatively obtain source code flow；Wherein the scheme of channel decoding passes through channel decoding scheme
Configurator is configured；
Step S27：Code stream after channel decoding is reverted into continuous bit stream using code block cascade, then using going to the schools CRC
The operation tested, finally obtains source code flow.
6. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 5,
It is characterized in that：The cut-in method of the system uses HE-TDMA agreements：Conventional frame is used under normal circumstances, needs to carry out
Superframe extension mechanism is used when point spread.
7. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 6,
It is characterized in that：Extended method is used by the superframe extension mechanism：
Wherein, extended method is：The conventional frame of cut-in method is made of synchronization frame, control frame, N number of data frame；For
For the synchronization frame of regular frame, 8 different nodes can be distributed to by sharing 8 different time slots, and another there are two pilot frames, are used for
It is used with balanced as each node channel estimation of network internal；The time slot that the cut-in method is occupied according to node to each node into
The corresponding number of row, it is No. n-th node to occupy n-th of time slot, and using the minimum node of number as host node, other nodes
For from node；After node is assigned number, the time slot of identical number is used in subsequent control frame and data frame；Work as number of nodes
When amount is more than 8, one frame of HE-TDMA protocol extensions is attached to after regular frame, and extension frame possesses just the same with regular frame
Frame structure；If all nodes can't be accommodated after one extension, extend again.
8. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 7,
It is characterized in that：The node networking flow of the HE-TDMA agreements specifically includes following steps：
Step S31：When network will be added in node, which is intercepted first, is not taken office if intercepted whithin a period of time
What synchronizing information, then the node thinks that network is nearby not present, the node is oneself being set as No. 1 node, when occupying No. 1
Gap, and broadcast the synchronizing information of oneself in No. 1 slot timing of synchronization frame；If the node have receive other node send it is same
Information is walked, then enters step S32；
Step S32：The instruction that networks is sent in the response time slot of the control frame of host node, and judges whether to clash, if occurring
Conflict then sends the instruction that networks, if no conflict occurred, enters step S33 again after certain time-delay；
Step S33：Host node issues network access node distribution sky in the order sending time slots of control frame again after receiving networking instruction
Not busy time-gap number, automatic to extend a frame if present frame does not have free timeslot, network access node then occupies after obtaining this number
The time slot of this number completes networking work.
9. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 8,
It is characterized in that：The HE-TDMA agreements are synchronized in network laggard row clock of node, wherein synchronous method include self-synchronizing method with it is outer
Synchronos method；The wherein described external synchronization method is synchronized using the clock that satellite information system provides, and is the acquiescence of HE-TDMA agreements
Synchronous method；After external synchronization method fails, HE-TDMA agreements start self-synchronizing method, and the self-synchronizing method includes the following steps：
Step S41：Carry out open loop synchronization：Host node is first in the synchronization time slot broadcast synchronization information frame of oneself, synchronizing information frame
Interior includes the host node synchronous base time, and receiving the synchronous base time from node resets the timer of oneself and main section
The synchronous base time of point is consistent, and is synchronized to complete open loop；
Step S42：Carry out closed-loop synchronization：From node on the basis of having completed open loop synchronization, broadcasted in its synchronization time slot
Its synchronizing information frame, this synchronizing information frame include the synchronous base time from node, and host node is receiving this from node
Fiducial time after be compared with the fiducial time of oneself, if the difference of the two be less than preset value if think to synchronously complete, it is no
Then time adjustment is being re-started from the synchronous response time slot of node transmission synchronous base time error to inform from node；From section
Its synchronizing information frame is broadcasted in its synchronization time slot again after point adjustment, step S42 is repeated, is less than until the two is only poor
Preset value.
10. a kind of transmission method of software radio data transmission system based on LTE signals according to claim 9,
It is characterized in that：After HE-TDMA agreements complete time slot distribution and the synchronous working of system, the transmission of data is carried out；Wherein, institute
The transmission for stating data includes the following steps：
Step S51：Sending node is transmitted in the order transmission time slot transmission data of control frame first asks, and receiving node receives this
After a order, responded accordingly in the response time slot of control frame；
Step S52：If sending node is only transmission order, terminate this operation；If sending node also needs to be ordered
Transmission is enabled, then receiving node is after the sending node data transmission subframes of data frame have received data, in the response of data frame
Gap is responded accordingly, completes a data transfer operation.
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