CN106788887A - A kind of soft decoding method received based on multi-path distributed transparent hard decision - Google Patents
A kind of soft decoding method received based on multi-path distributed transparent hard decision Download PDFInfo
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- CN106788887A CN106788887A CN201611130957.3A CN201611130957A CN106788887A CN 106788887 A CN106788887 A CN 106788887A CN 201611130957 A CN201611130957 A CN 201611130957A CN 106788887 A CN106788887 A CN 106788887A
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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
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0039—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver other detection of signalling, e.g. detection of TFCI explicit signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
Abstract
The invention discloses a kind of soft decoding method received based on multi-path distributed transparent hard decision, this method includes：The entities such as distributed reception module, hard decision converging information unit, Soft Inform ation generation unit and channel decoding unit, this method obtains independent hard decision information using distributed wireless reception scheme, merge algorithm by big number to realize merging the hard decision data bag of distributed reception, and export Soft Inform ation, this method further realizes the merging to multipath reception using Soft decision decoding, obtains diversity gain.The present invention can be reduced effectively because multipath effect and sharp keen decline cause data-bag lost by being distributed reception, realizing diversity gain by decoding process, cause the situation of data transmission fault, it is also possible to improve the reliability of data receiver.
Description
Technical field
It is more particularly to a kind of to have time and space diversity special the invention belongs to the highly reliable reception field in being wirelessly transferred
The wireless receiving scheme of property.
Background technology
With the development of the communication technology, people are continuously increased to the demand of high speed reliable communication, but sometimes in communication system,
Especially in wireless communication system, the limited strength of transmitting terminal transmission signal, transmission path is complicated, with very big randomness, and
And there is path loss.Also, have because of Rayleigh fading caused by multipath effect toward contact in signals transmission, and also
There is shadow effect.Therefore, receiving terminal is often subject to various interference when the signal sent by transmitting terminal is received and letter occurs
Number distortion, seriously limits the reliability and validity of communication.To ensure that receiving terminal can reliablely and stablely receive transmitting terminal institute
The signal of transmission, channel coding technology and diversity technique have turned into standard technique.
Channel coding is fast with the transmission of the information of sacrificing by increasing redundancy according to certain constraints in the information
Rate be cost in finite bandwidth and compared with low signal-to-noise ratio in the case of realize the low error rate transmission of information, overcome and make an uproar in transmission channel
Sound and the influence for declining.In recent years, researcher proposes the channel coding schemes, energy such as Turbo code, LDPC code close to channel capacity
It is enough to obtain coding gain higher in the channel.
Diversity technique is as the key measure of channel fading loss balancing, its basic thought：Received by multiple channels
Multiple copies of identical information are carried, because signal is transmitted in different channels, the decline thought of signal multiple copy would not phase
Together, thus identical signal different copy correlations it is smaller, receiver is carried out for different copy signals according to certain rule
Merging treatment causes that system received signal to noise ratio is maximum, it is possible to increase system transfers reliability.Diversity technique from spatial domain, frequency domain and
Temporal partitioning is 3 classes：Space diversity, frequency diversity and time diversity.Wherein, the advantage of space diversity technology is abundant profit
System space domain is used, and redundancy is not introduced into time domain or frequency domain, in the case where identical traffic rate conditions are ensured, multipath can be overcome to decline
Fall, diversity gain is obtained, as wireless communication field guardian technique, by the extensive concern of academia.
Inventor realize it is of the invention during, discovery has the following disadvantages and not enough in the prior art：
Carrying out data receiver using single antenna during being wirelessly transferred has packet loss high, transmission performance difference the characteristics of；Separately
On the one hand, can to a certain extent be detected by data after channel coding using single antenna reception and correct mistake, but to property
Can improve limited in one's ability.
Therefore, the shortcoming of wireless receiving is carried out for above-mentioned use single antenna, in order to preferably improve wireless sensor network
Network data transmission credibility, method of the present invention by increasing redundancy in time domain and spatial domain is devised a kind of based on multichannel point
The soft decoding method that the transparent hard decision of cloth is received.
The content of the invention
The invention provides a kind of soft decoding method received based on multi-path distributed transparent hard decision, the present invention relative to
Traditional single antenna reception scheme substantially increases the reliability of information transfer, described below：
A kind of soft decoding method received based on multi-path distributed transparent hard decision, the described method comprises the following steps：
(1) wireless signal is received using multiple distributed reception nodes, each distributed node is received and saved by same transmitting
The data packet signal that point sends, and signal to receiving is demodulated output hard decision data frame；
(2) hard decision converges unit and the multichannel hard decision data frame that distributed reception node is exported is alignd and converged
Merge；
(3) soft decision information generation unit is realized converging hard decision entering by converging the data frame for merging for unit output
Row soft decision information maps；
(4) error correcting coding schemes that channel decoding unit is used according to transmitting terminal, choose available soft-decision decoding method,
The Soft Inform ation exported using Soft Inform ation generation unit carries out Soft decision decoding, obtains multichannel diversity gain and compiles by decoding process
Code gain.
Described to receive wireless signal using multiple distributed reception nodes, each distributed node is received and saved by same transmitting
The data packet signal that point sends, and signal to receiving is demodulated output hard decision data frame, specially：
(1) each distributed node receives the data of the identical transmission of same transmitting node on different geographical spaces, the number
It is to use the error correcting code that can enter row decoding with Soft decision decoding algorithm to be encoded according to frame, and data frame is comprising frame number
's；
(2) each distributed node received signal includes frame number information, the code that initial data is encoded by error correcting code
Word information；The information for being received is the bit information that front end receiver module is exported by hard decision；Frame number is by using strong
Technology such as repeated encoding of the guarantee reliability of change etc. ensures the reliability that signal is received.
The hard decision converging information unit is realized carrying out the hard decision data frame of distributed reception nodal parallel output
Align and concretely comprising the following steps that convergence merges：
(1) by cable network, it is also possible to by highly reliable wireless network, by the individual reception hard decision data transmission of n roads
To hard decision converging information unit, n is the normal number more than 2, represents the amount of parallelism of distributed reception equipment；
(2) the frame number information of each hard decision data frame is obtained, and to each hard decision data frame, is believed according to frame number
Breath carries out hard decision information merging, specially：
(2.1) the frame hard decision data frame received using n distributed node of n buffer memory；
(2.2) when packet loss occurs in wherein any distributed receiving node, namely during frame number missing, data bit in the caching
Zero padding treatment is carried out, frame number information is consistent with current data frame；
(2.3) while data frame in the current identical numbering data frame set of parallel output, hard decision is obtained after obtaining alignment
Information.
The data frame merged by convergence that unit output is converged to hard decision carries out the tool of soft decision information mapping
Body step is：
(1) frame number information in current data frame set, extracts hard decision information；
(2) it is p to calculate the number that the corresponding data frame same position bit of each distributed reception end node is ' 1 '；
(3) Soft Inform ation of each bit is initialized asWherein α is to be optimized just according to different error correction code
Real constant；
(4) row decoding is entered in the soft decision information feeding decoder that will be obtained, while obtaining diversity gain and coding gain.
Brief description of the drawings
Fig. 1 is a kind of realization knot of soft decoding method received based on multi-path distributed transparent hard decision that the present invention is provided
Structure schematic diagram；
Fig. 2 is the hard decision converging information unit process schematic diagram that the present invention is provided；
Fig. 3 is the soft decision information generation unit process schematic that the present invention is provided；
Fig. 4 is the hard decision converging information unit process that the present invention is provided；
Fig. 5 is the hardware architecture diagram that the present invention is provided.
Below in conjunction with the accompanying drawings to a kind of soft decoding transmission side received based on multi-path distributed hard decision proposed by the present invention
Method elaborates.
Referring to Fig. 1, a kind of soft decoding method received based on multi-path distributed transparent hard decision realizes that structure includes：Point
Cloth receiver module, hard decision converging information unit, Soft Inform ation generation unit, channel decoding unit.
The carrying that distributed radio frequency units are launched using multiple distributed reception node multipath receptions by single channel transmitter unit
Have frame number information, initial data by the codeword information of channel coding wireless signal；Further, each distributed reception node
The internal wireless signal to receiving carries out corresponding demodulation process, and carries out hard decision, exports hard decision information；Secondly, sentence firmly
Certainly converge unit and the multichannel hard decision data frame that distributed reception node is exported is alignd and merge with being converged；
Then, soft decision information generation unit realizes converging hard decision the data frame merged by convergence of unit output
Carry out soft decision information mapping；
Finally, the error correcting coding schemes that channel decoding unit is used according to transmitting terminal, choose available Soft decision decoding side
Method, the Soft Inform ation exported using Soft Inform ation generation unit carries out Soft decision decoding, and multichannel diversity gain is obtained by decoding process
With coding gain.
Referring to Fig. 2, the detailed process of realizing of hard decision converging information unit is：
(1) by cable network, it is also possible to by highly reliable wireless network, by the individual reception hard decision data transmission of n roads
To hard decision converging information unit, n is the normal number more than 2, represents the amount of parallelism of distributed reception equipment；
(2) the frame number information of each hard decision data frame is obtained, and to each hard decision data frame, is believed according to frame number
Breath carries out hard decision information merging, specially：
(2.1) the frame hard decision data frame received using n distributed node of n buffer memory；
(2.2) when packet loss occurs in wherein any distributed receiving node, namely during frame number missing, data bit in the caching
Zero padding treatment is carried out, frame number information is consistent with current data frame；
(2.3) while data frame in the current identical numbering data frame set of parallel output, hard decision is obtained after obtaining alignment
Information.
Referring to Fig. 3, the detailed process of realizing of soft decision information generation unit is：
(1) frame number information in current data frame set, extracts hard decision information；
(2) it is p to calculate the number that the corresponding data frame same position bit of each distributed reception end node is ' 1 '；
(3) Soft Inform ation of each bit is initialized asWherein α is to be optimized just according to different error correction code
Real constant；
(4) row decoding is entered in the soft decision information feeding decoder that will be obtained, while obtaining diversity gain and coding gain.
Specific embodiment
The embodiment of the present invention constructs multi-path distributed antenna transmitting-receiving system with embedded-type ARM platform and radio-frequency module CC1101
As a example by system, a kind of soft decoding side received based on multi-path distributed transparent hard decision that the embodiment of the present invention is proposed is described
Method.
Using single wireless sensor node collecting temperature and Lighting information, it is 1/2 to use code check, and code length is 336
Turbo code is encoded as channel coding schemes；It is divided into 4 packets to every frame data frame to be transmitted, before radio frequency
End carries out wireless transmission.Receiving terminal carries out data receiver using 4 distributed radio-frequency front-ends, exports the parallel hard decision information in 4 tunnels；
Soft Inform ation is further exported, deinterleaving is eventually passed through and is obtained the original of each sensor node collection with the decoding of soft-decision Turbo code
Data；Finally, the initial data of collection is sent to PC ends by aggregation node using udp protocol by network interface, in the upper of PC ends
Shown on machine.
It is transmitted because the present embodiment is divided into 4 packets per frame data frame, then hard decision converging information unit is to 4
The process that the hard decision data of distributed reception unit output is converged is as shown in figure 4, be specially：
(1) obtain from 4 hard decision data bags of each distributed reception node parallel, for each distributed reception section
The continuous 4 bag hard decision data bags that receive of point are used as a frame data frame；Wherein, hard decision data bag is by frame number information, Bale No. information
And set of data bits into；
(2) frame number information and Bale No. information of each hard decision data bag are obtained, frame number information and Bale No. information are used respectively
Different pieces of information bag in different pieces of information frame and same data frame is distinguished；
(3) to each hard decision data bag, hard decision information merging is carried out according to frame number information and Bale No. information, specifically
For：
(3.1) hard decision data bag is logically carried out into 4 rows 4 and arranges storage；
(3.2) hard decision data bag is adjusted according to frame number information and Bale No. information, makes the number with identical frame number
Same a line is according to bag, entering ranks according to Bale No. information adjusts, and makes the hard decision data with identical Bale No. in different pieces of information frame
Bag is in same row；
(3.3) there is the most packet set of identical frame number number in 4 × 4 hard decision data bags of acquisition, by the frame collection
Frame number in conjunction is used as current frame number；
(3.4) when 4 × 4 hard decision data Bao Douwei have same data frames, then by after Bale No. mapping, exporting 4 × 4
The data stored in logic unit carry out soft-decision mapping；Otherwise, 4 sentencing firmly from each distributed reception node are obtained again
Certainly packet is covered to non-present frame hard decision data bag, until the packet stored in 4 × 4 logic units is belonged to together
One data frame.
Fig. 5 is distributed reception end hardware platform, mainly includes radio-frequency front-end and CPU.Radio-frequency front-end by
MCU and wireless transmitter module are constituted.The control that MCU realizes receiving and dispatching radio-frequency module by the sequential that I/O port simulates SPI interface, and
And the length for radio frequency chip transmission power and single transmitting and receiving data bag is configured；Radio-frequency module uses CC1101
Module, the main conversion completed between radiofrequency signal and data signal, exports hard decision information.Processed as center from ARM
Module, the big number for completing to receive data merges and channel decoding work.CPU is received by serial ports and comes from front end
The sensing data of radio-frequency module, merge output Soft Inform ation through excessive number carries out Soft decision decoding for Turbo code decoder, enters one
The initial data for obtaining after walking to decoding carries out udp protocol encapsulation, is transmitted to PC host computer user terminals by network interface.
The radiofrequency emitting module that transmitting terminal is used is CC1101 modules, and transmission power is configured to 2W, and transmission rate is
0.6kbps patterns, carrier frequency is 433MHz, and bandwidth 58kHz, modulation system is GFSK.The identical that receiving terminal is also adopted by is penetrated
Frequency module is 433MHz as radio-frequency front-end, wherein carrier frequency, and bandwidth 58kHz, modulation system is GFSK.
Distributed reception antenna is placed on liftoff 20 meters or so height, 4 distribution types by the present embodiment when being tested
Spaced 1 meter of antenna.Single wireless sensor node is placed on into four test points carries out performance test, and test environment is more multiple
Miscellaneous, not only including open ground, also high-lager building and trees is blocked.Wherein, the range distribution formula of test point 1,2,3,4 is received
Nodal distance is respectively 225 meters, 461 meters, 680 meters, 985 meters.
Statistics after 4000 frame data are transmitted, the packet drop of the data frame of receiving terminal each radio frequency reception, CRC check feelings
Condition and Turbo decoding situations, and contrasted using the decoding situation after number merges greatly with aggregation node.Each test point institute
Returned data situation is as shown in table 1~4.Wherein, CRC check mistake and the wrong main cause of decoding are caused in four test points is
Because data-bag lost, also, by contrast, the spaced antenna that the embodiment of the present invention is proposed receives wireless sensor network
Transmission plan relatively has more preferable error correcting capability using single antenna reception, and situation about largely being lost in packet ensures data
Highly reliable reception and decoding, can realize that data higher reliability is transmitted.
The result of 1 test point of table 1
The result of 2 test point of table 2
The result of 3 test point of table 3
The result of 4 test point of table 4
Claims (4)
1. a kind of soft decoding method received based on multi-path distributed transparent hard decision, it is characterised in that comprise the following steps：
(1) wireless signal is received using multiple distributed reception nodes, each distributed node is received to be sent out by same transmitting node
The data packet signal for sending, and signal to receiving is demodulated output hard decision data frame；
(2) hard decision converges unit and the multichannel hard decision data frame that distributed reception node is exported is alignd and conjunction is converged
And；
(3) soft decision information generation unit realizes converging hard decision the data frame merged by convergence of unit output, carries out
Soft decision information maps；
(4) error correcting coding schemes that channel decoding unit is used according to transmitting terminal, choose soft-decision decoding method, using Soft Inform ation
The Soft Inform ation of generation unit output carries out Soft decision decoding, and multichannel diversity gain and coding gain are obtained by decoding process.
2. a kind of soft decoding method received based on multi-path distributed transparent hard decision according to claim 1, its feature
It is to receive wireless signal using multiple distributed reception nodes, each distributed node is received and sent by same transmitting node
Data packet signal, and signal to receiving is specially the step of be demodulated output hard decision data frame：
(1.1) each distributed node receives same transmitting node on different geographical spaces and sends identical data, using can
Encoded with the error correcting code for entering row decoding using Soft decision decoding algorithm, and data frame is comprising frame number；
(1.2) each distributed node received signal includes frame number information, the code word that initial data is encoded by error correcting code
Information；The information for being received is the bit information that front end receiver module is exported by hard decision；Frame number is by using reinforcing
Guarantee reliability technology, it is ensured that signal receive reliability.
3. a kind of soft decoding method received based on multi-path distributed transparent hard decision according to claim 1, its feature
It is that hard decision converging information unit realizes that the hard decision data frame of distributed reception nodal parallel output is alignd and converged
The step of being polymerized simultaneously is specially：
(2.1) by cable network, or by highly reliable wireless network, n roads individual reception hard decision data is transmitted to sentencing firmly
Certainly converging information unit, n is the normal number more than 2, represents the amount of parallelism of distributed reception equipment；
(2.2) the frame number information of each hard decision data frame is obtained, and to each hard decision data frame, according to frame number information
Carry out hard decision information merging；
Wherein, the step is specially：
The frame hard decision data frame that (2.2.1) is received using n distributed node of n buffer memory；
There is packet loss when wherein any distributed node in (2.2.2), namely during frame number missing, data bit is mended in the caching
Zero treatment, frame number information is consistent with current data frame；
(2.2.3) while data frame in the current identical numbering data frame set of parallel output, obtain after alignment hard decision is believed
Breath.
4. a kind of soft decoding method received based on multi-path distributed transparent hard decision according to claim 1, its feature
It is that soft decision information generation unit realizes converging hard decision the data frame merged by convergence of unit output, carries out soft
The step of discriminative information maps is specially：
(3.1) frame number information in current data frame set, extracts hard decision information；
(3.2) it is p to calculate the number that the corresponding data frame same position bit of each distributed reception end node is ' 1 '；
(3.3) Soft Inform ation of each bit is initialized asWherein α is the positive reality optimized according to different error correction code
Number；
(3.4) row decoding is entered in the soft decision information feeding decoder that will be obtained, while obtaining diversity gain and coding gain.
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| CN107682073A (en) * | 2017-09-30 | 2018-02-09 | 北京空间技术研制试验中心 | The communication means of spacecraft and target device out of my cabin |
| CN108055106A (en) * | 2017-12-09 | 2018-05-18 | 天津大学 | One kind detects codeword boundary recognition methods based on RM code Partial Decodes auxiliary differential |
| CN110446005A (en) * | 2019-07-09 | 2019-11-12 | 南京速瑞特信息科技有限公司 | Power system monitor video receiving apparatus and method for processing video frequency |
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| CN107682073A (en) * | 2017-09-30 | 2018-02-09 | 北京空间技术研制试验中心 | The communication means of spacecraft and target device out of my cabin |
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