CN105553520B - Hard-decision-based diversity reception method and system for short-wave access network - Google Patents
Hard-decision-based diversity reception method and system for short-wave access network Download PDFInfo
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- CN105553520B CN105553520B CN201510952373.3A CN201510952373A CN105553520B CN 105553520 B CN105553520 B CN 105553520B CN 201510952373 A CN201510952373 A CN 201510952373A CN 105553520 B CN105553520 B CN 105553520B
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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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
Abstract
The invention provides a hard-decision-based diversity reception method and system for a short-wave access network, which is suitable for the field of short-wave communication. The hard-decision-based diversity reception method comprises the steps: a remote-end user and a constant station of the short-wave access network perform interaction to complete link establishment and network access; the constant station sends operating frequency f to a control center; the control center, according to the quantity N of paths needing of receiving signals, selects other N-1 constant stations of the short-wave access network and sets the operating frequency to be f, and when the signals need to be sent, the remote-end user sends the signals, and the constant station performs processing and decision and collects verification results into the control center; finally, the control center selects any one path of verification-passing decoded signals as the final signals to be output, and if the verification of the all constant stations is failed, signal reception is judged to be failed. According to the hard-decision-based diversity reception method and system for the short-wave access network, which are provided by the invention, the application of diversity reception in the short-wave access network is achieved, an advantage of an access network on provision of multi-path transmission is fully developed, a diversity reception effect is achieved, and the quality of short-wave communication is effectively improved.
Description
Technical field
The invention belongs to New Technology Of Shortwave Communication field, more particularly, to a kind of shortwave access network is connect based on the diversity that hard values are adjudicated
Receiving method and system.
Background technology
Short wave communication relies primarily on ionospheric reflection and is propagated, and is capable of non-relay telecommunication, has motor-driven
Property strong, the features such as network reconfiguration is quick and survivability is strong, be widely used in the neck such as military affairs, ocean, fishery, the disaster relief, meteorology, diplomacy
Domain.Meanwhile, it is also a kind of emergent and communication of guaranteeing the minimum important means.
Ionosphere is a kind of transmission medium of time-varying in itself, there is multi-path jamming, time selective fading, Doppler's frequency
The complicated factor such as shifting, this leads to traditional point-to-point short wave communication cannot obtain good communication quality.Modern short wave communication
Mainly adopt access network networking model, access network includes fixed station and the control centre being distributed in different geographical.These are fixed
The station is connected with each other by wired mode, and connects to control centre.Remote subscriber is wirelessly accessed by short-wave link
Shortwave access network, realizes communicating with other remote subscribers or wire user.In existing shortwave access network, remote subscriber passes through asynchronous
Pattern (as navigation sound pattern) or synchronous mode (as U.S. army's 3g pattern) network, but this remains a kind of point-to-point communication party
Formula, it is high that signal receives the bit error rate.
Content of the invention
In view of the above problems, it is an object of the invention to provide a kind of diversity reception adjudicated based on hard values of shortwave access network
Method and system receive the high technical problem of the bit error rate it is intended to solve existing point-to-point shortwave access way signal.
On the one hand, described shortwave access network is comprised the steps: based on the diversity receiving method that hard values are adjudicated
Remote subscriber is interacted with one of shortwave access network fixed station by asynchronously or synchronously pattern and completes chain
Road is set up and is networked, and after link establishment, the operating frequency between described remote subscriber and fixed station is f；
Described fixed station is sent described operating frequency f to control centre by cable network；
Number of path n of described control centre receipt signal as needed, other n-1 fixations in selected shortwave access network
The station, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms a receiving station altogether here
Set；
Remote subscriber proceed-to-send signal；
N fixed station receipt signal under being uniformly controlled of the heart in the controlling, n fixed station enters to the signal receiving
Row is processed, and is made decisions according to check results；If verifying successfully, fixed station judges that receipt signal is correct；If verification is lost
Lose, then fixed station judges that receipt signal is wrong；Check results are collected to control centre by n fixed station；
In all check results, as long as there being a fixed station to verify successfully, then assert that signal receives correctly, control centre
Select any one road to verify successful decoded signal to export as final signal, if the verification of all fixed stations is all unsuccessful, control
Signal reception failure is assert at center processed.
On the other hand, described shortwave access network includes remote subscriber and shortwave based on the diversity system that hard values are adjudicated
Access network, the fixed station comprising control centre and being distributed in different geographical in described shortwave access network, described fixed station
Between connected by cable network, and connect to described control centre, described fixed station is used for realizing wirelessly connecing of remote subscriber
Enter, complete wirelessly to arrive wired conversion；
Wherein said remote subscriber includes:
Link setup networking module, for being handed over one of shortwave access network fixed station by asynchronously or synchronously pattern
Mutually complete link establishment and networking, after link establishment, the operating frequency between described remote subscriber and fixed station is f；
Signal transmitting module, for proceed-to-send signal；
Wherein said fixed station includes:
Frequency sending module, for being sent described operating frequency f to control centre by cable network；
Process judging module, for receipt signal under being uniformly controlled of the heart in the controlling, and the signal receiving is carried out
Process, made decisions according to check results；If verifying successfully, judge that receipt signal is correct；If verifying unsuccessfully, judge to receive
Signal is wrong；Then check results are collected to control centre；
Wherein said control centre includes:
Select setup module, for number of path n of receipt signal as needed, other n-1 in selected shortwave access network
Individual fixed station, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms one and connects altogether here
Receive station set；
Signal output module, in all check results, as long as there being a fixed station to verify successfully, then assert letter
Number receive correct, select any one road to verify successful decoded signal and export as final signal, if the verification of all fixed stations
All unsuccessful, assert signal reception failure.
The invention has the beneficial effects as follows: present invention achieves adopting diversity receiving technology scheme in shortwave access network, fill
Advantage in terms of providing multiplexing for the distribution pick access network, remote subscriber is connect by selecting the preferable fixed station of channel quality
Enter, the effect of diversity reception can be reached, effectively lifting short wave communication quality.The present invention realizes simple, in station support cross complaint
On the basis of, less transformation is carried out to existing shortwave access network and can form receiving station set；In addition autgmentability is strong, according to
Demand to received signal quality, control centre can neatly adjust the number of fixed station in receiving station set, with suitable
Answer the demand of unlike signal intensity；Meanwhile, compared with merging with soft value, hard values judgement merges not to be needed in fixed station and control
Special data transmission network is built, cost of implementation is low between the heart.
Brief description
Fig. 1 is the flow process of the diversity receiving method that the shortwave access network that first embodiment of the invention provides is adjudicated based on hard values
Figure；
Fig. 2 is that signal sends the entire block diagram receiving；
Fig. 3 is data frame structure figure；
Fig. 4 is coder structure figure；
Fig. 5 is the relation of the bit error rate during signal of fixed station reception remote subscriber of varying number and bit signal to noise ratio
Figure；
Fig. 6 is the structure of the diversity system that the shortwave access network that second embodiment of the invention provides is adjudicated based on hard values
Figure.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
In order to technical solutions according to the invention are described, to illustrate below by specific embodiment.
Embodiment one:
Fig. 1 shows the stream of the diversity receiving method that shortwave access network provided in an embodiment of the present invention is adjudicated based on hard values
Journey, illustrate only the part related to the embodiment of the present invention for convenience of description.
Step s101, remote subscriber are handed over by one of asynchronously or synchronously pattern and shortwave access network fixed station
Mutually complete link establishment and networking, after link establishment, the operating frequency between described remote subscriber and fixed station is f.
Remote subscriber passes through asynchronous mode (as navigation sound pattern) or synchronous mode (as U.S. army's 3g pattern) is accessed with shortwave
Certain fixed station in net is carried out shaking hands interaction, sets up link and networks.After link establishment, remote subscriber and fixed station work
Make in operating frequency f determining.
Step s102, described fixed station are sent described operating frequency f to control centre by cable network.
Wired mode is adopted to connect between fixed station and between fixed station control centre, such as fiber optic network connects
Connect.Fixed station is responsible for the wireless access of remote subscriber, completes wirelessly to arrive wired conversion.Control centre controls fixed station
Related work, such as receiving and transmitting signal, access authentication of user, route switching, frequency distribution and safety management etc..When remote subscriber connects
Enter to after shortwave access network, between remote subscriber and the fixed station establishing the link therewith, have operating frequency f of a fixation, will
Operating frequency f sends to control centre.
Number of path n of step s103, described control centre receipt signal as needed, other in selected shortwave access network
N-1 fixed station, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms one altogether here
Individual receiving station set.
After control centre receives operating frequency f of fixed station transmission, if system needs to receive n road signal, shortwave connects
Need n fixed station in networking to be all operated in operating frequency f, therefore control centre also needs in shortwave access network selection
Other n-1 fixed stations, its operating frequency is similarly arranged to f, is so operated in all solid in operating frequency f
Determine the station and can receive the signal that remote subscriber sends.Here n fixed station constitutes receiving station set, one of
The fixed station accessing during link setup initial for user, other n-1 control lower operating frequency to be set to consolidating of f for the heart in the controlling
Determine the station.
Step s104, remote subscriber proceed-to-send signal.
Step s105, n fixed station receipt signal under being uniformly controlled of the heart in the controlling, n fixed station is to reception
To signal processed, and made decisions according to check results；If verifying successfully, fixed station is just judging receipt signal
Really；If verifying unsuccessfully, fixed station judges that receipt signal is wrong；Check results are collected to control centre by n fixed station.
In step s106, all check results, as long as there being a fixed station to verify successfully, then assert that signal just receives
Really, control centre selects any one road to verify successful decoded signal as final signal output, if the verification of all fixed stations
All unsuccessful, signal reception failure is assert by control centre.
After the completion of the operating frequency of fixed station sets, remote subscriber gets final product sending signal, and operating frequency is that the n of f is individual solid
Determine the station and receive the signal that remote subscriber sends, then each fixing platform is processed to the signal receiving and adjudicates,
And check results are sent out and is collected to control centre；Control centre determines according to the check results that receive the Frame that receives whether
Correctly, its basis for estimation is as follows: if the check results receiving are all unsuccessfully that abandoning should then it is assumed that the data frame error receiving
Frame；Otherwise, assert that the Frame receiving is correct, and be successfully any selection one multiple signals from receiving check results
Road signal is as final output signal.
In the present embodiment, in order to realize diversity reception, check results are collected to control centre by n fixed station, realize
Receive and merge, obtain diversity, lift system performance.
Because current shortwave access network supports the mutual control function between fixed station, therefore form a receiving station set
Combine reception multiple signals realize fairly simple, to existing shortwave access network transform less.And this method autgmentability is strong, root
According to the demand to received signal quality, control centre can neatly adjust fixed station number in receiving station set, with suitable
Answer the demand of unlike signal intensity.
The present embodiment adopts the diversity receiving method that hard values judgement merges, and according to soft value, (i.e. each fixed station receives
After signal after filtering and down-converted, export baseband discrete sampled signal) diversity receiving method that merges, need each
The baseband discrete sampled signal of fixed station output is collected to and focuses on center processing.Need to merge due to focusing on center
Receive multichannel baseband discrete sampled signal, therefore needed in fixed station using soft value merging mode and focus between center
Transmit substantial amounts of data, and each road receiving data reach and focuses on center and need strict time synchronization, fixed station with
Focus on when there is not special data transfer route between center, soft value merge realize relatively difficult.And the present embodiment side
Method adopts the diversity receiving method that hard values judgement merges, and compared with soft value merging, hard values judgement merges not to be needed in fixed station
Build special data transmission network and control centre between, complexity is low, and cost of implementation is low.
The signal that above-mentioned steps s104-s106 achieve remote subscriber sends, and n fixed station in shortwave access network
The signal stood receives, processes, the process of judgement, and below with remote subscriber as transmitter, fixed station is whole for receiver description
The detailed process sending and receiving.Send the entire block diagram receiving with reference to the signal shown in Fig. 2, remote subscriber is as emission part
Point, by signal to be sent through verification (such as adopting crc to verify), coding (such as adopting fec to encode, using convolutional code),
Symbol mapping, scrambled code, modulation (such as adopting psk to modulate), up-conversion, power amplification；The n fixed station being operated in frequency f
Stand and receive the signal of remote subscriber transmitting, after filtering, down coversion, demodulation, descrambling, inverse mapping, decoding (such as adopts
Viterbi decodes) and verification (such as adopting crc to verify), obtain decoded signal and check results, all fixing platform high-ranking officers
Testing result and deliver to control centre, after control centre receives n check results, if exist verifying successfully, arbitrarily selecting a road
Successfully decoded signal is as final output signal；Otherwise it is assumed that the data frame error receiving.
In the present embodiment, fixed station in receiving station set each complete independently filtering, down coversion, demodulate, go to disturb
Code, inverse mapping, decoding, verification judgement etc. are processed, and obtain final verification and decoding result.The check results of each station are into
Check results are sent to control centre after the completion of station verification by work(or failure, realize receiving merging, lift system performance.By
In each fixed station independent interpretation, and a successful road decoded signal will be verified as final output signal, thus referred to as hard
Value judgement decoding.And in soft value merges, the discrete sample signals that multiple stations receive are collected and are gone forward side by side by the center that focuses on
Row merges.
In order to prove the performance gain that diversity reception brings, below by concrete verification experimental verification:
Simulated voice is sent into vocoder and is processed by remote subscriber transmitting portion, and 75ms exports frame data, and length is
45bit, mends 3 " 0 " bits (bit) to its afterbody, then adds the crc verification of 12bit, obtains the Frame of 60bit, data
Speed is 800bit/s, and data frame structure is as shown in figure 3, bit position is p from left to right0To p59.In the data forming 60bit
During frame, need to add the crc position of 12bit in afterbody, the crc being adopted produces multinomial and is:Low level first exports as p48.Then each frame data are entered
Row code check is 1/2, and constraint length is 9 convolutional encoding, and after coding, speed is 1600bit/s；It is eventually adding targeting sequencing and interior
Slotting pilot tone, carries out symbol mapping, carries out sending after 8psk modulation, up-conversion and power amplification are processed after scrambled code.
60bit data to every frame, carrying out code check is 1/2, and constraint length is 9 convolution coding, and coder structure is such as
Shown in Fig. 4.Encoder generator polynomial is:With WhereinRepresent mould 2 plus computing.Data enters encoder for convolution codes and carries out " stinging
Tail " encodes, and rule is as follows: (1) uses the state of rear 8 initialization encoders in Frame: every frame position p52……p59Right respectively
Answer the x of encoder1……x8, i.e. depositor x1Value be p52, depositor x8Value be p59；(2) shift register x8……x1In
Data shift right once to depositor x7……x0In, then by data the 1st bit p0It is displaced to depositor x8；(3) with
The Sequential output coded-bit of bitout0, bitout1.Input data, right shift, repeat said process until reading 120
Coded-bit.
Fig. 5 shows that the bit error rate (ber) that the fixed station of varying number receives during the signal of remote subscriber is believed with bit
Make an uproar than the relation of (eb/n0).The channel that this test example adopts is rayleigh fading channel, and branches represents path number
The fixed station number of receipt signal (i.e. simultaneously), the channel between remote subscriber and multiple fixed station is separate, merges point 3
Referring to is the signal merging to after the completion of crc verification.As seen from the figure in ber=10-2When, fixed station number
When mesh is respectively 1,2,3,4 and 5, corresponding eb/n0 is about 15db, 8db, 6db, 5.5db and 4.5db.Can from this test
Go out, after diversity technique, systematic function can be significantly improved.
Embodiment two:
Fig. 6 shows the structure of the diversity system that shortwave access network provided in an embodiment of the present invention is adjudicated based on hard values
Figure, illustrate only the part related to the embodiment of the present invention for convenience of description.
The shortwave access network that the present embodiment provides includes remote subscriber 1 and short based on the diversity system that hard values are adjudicated
Ripple access network 2, comprise control centre 21 and the fixed station 22 that is distributed in different geographical in described shortwave access network 2 it is illustrated that
In have 3 fixed stations.Connected by cable network between described fixed station 22, and connect to described control centre 21, described
Fixed station 22 is used for realizing the wireless access of remote subscriber, completes wirelessly to arrive wired conversion；
Wherein said remote subscriber 1 includes:
Link setup networking module, for being handed over one of shortwave access network fixed station by asynchronously or synchronously pattern
Mutually complete link establishment and networking, after link establishment, the operating frequency between described remote subscriber and fixed station is f；
Signal transmitting module, for proceed-to-send signal；
Wherein said fixed station 22 includes:
Frequency sending module, for being sent described operating frequency f to control centre by cable network；
Process judging module, for receipt signal under being uniformly controlled of the heart in the controlling, and the signal receiving is carried out
Process, made decisions according to check results；If verifying successfully, judge that receipt signal is correct；If verifying unsuccessfully, judge to receive
Signal is wrong；Then check results are collected to control centre；
Wherein said control centre 21 includes:
Select setup module, for number of path n of receipt signal as needed, other n-1 in selected shortwave access network
Individual fixed station, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms one and connects altogether here
Receive station set；
Signal output module, in all check results, as long as there being a fixed station to verify successfully, then assert letter
Number receive correct, select any one road to verify successful decoded signal and export as final signal, if the verification of all fixed stations
All unsuccessful, assert signal reception failure.
Each functional module correspondence that the present embodiment provides achieves step s101-s106 in embodiment one, and far-end is used
Family 1 is interacted with one of shortwave access network fixed station by link setup networking module and completes link establishment and networking；Gu
Determine the station 22 to send described operating frequency f to control centre 21 by frequency sending module；Selection in control centre 21 sets
Put number of path n of module receipt signal as needed, other n-1 fixed stations in selected shortwave access network, and by this n-1
The operating frequency of individual fixed station is set to f, and n fixed station forms a receiving station set altogether here；When needs are sent out
During the number of delivering letters, remote subscriber 1 passes through signal transmitting module sending signal, and fixed station 22 is processed by processing judging module
And judgement, if verifying successfully, judge that receipt signal is correct；If verifying unsuccessfully, judge that receipt signal is wrong；Then will verify
Result is collected to control centre；Last control centre 21 selects any one road verification successfully decoding letter by signal output module
Number as final signal output, if all fixed stations verification all unsuccessful, assert signal reception failure.
As a kind of concrete structure, described signal transmitting module includes:
Signal transmitting unit, for carrying out successively verifying to the signal needing to send, encoding, symbol mapping, scrambled code, tune
System, up-conversion, power amplification are processed, and then launch the signal after processing.Using crc verification, coding is adopted for wherein verification
With fec coding, modulation is using psk modulation.
Described process judging module includes:
Processing unit, for being filtered successively to the signal receiving, down coversion, demodulation, descrambling, inverse mapping, decoding
And checking treatment, obtain decoded signal and check results；
Decision unit, makes decisions according to check results, if verifying successfully, judges that receipt signal is correct；If verification is lost
Lose, then judge that receipt signal is wrong；
Result output unit, for being collected to control centre by check results.Wherein decoding is using viterbi decoding, school
Test using crc verification.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (2)
1. the diversity receiving method that a kind of shortwave access network is adjudicated based on hard values is it is characterised in that methods described includes:
Remote subscriber is interacted by asynchronously or synchronously pattern and one of shortwave access network fixed station and completes link and build
Stand and network, after link establishment, the operating frequency between described remote subscriber and fixed station is f；
Described fixed station is sent described operating frequency f to control centre by cable network；
Number of path n of described control centre receipt signal as needed, other n-1 fixed stations in selected shortwave access network
Stand, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms a receiving station collection altogether here
Close；
Remote subscriber proceed-to-send signal, specifically, remote subscriber carries out successively verifying, encodes, accords with to the signal needing to send
Number mapping, scrambled code, modulation, up-conversion, power amplification are processed, and then launch the signal after processing；
N fixed station receipt signal under being uniformly controlled of the heart in the controlling, n fixed station to the signal receiving at
Reason, including being filtered successively, down coversion, demodulation, descrambling, inverse mapping, decoding and checking treatment, obtain decoded signal and verification
As a result, and according to check results make decisions；If verifying successfully, fixed station judges that receipt signal is correct；If verifying unsuccessfully,
Then fixed station judges that receipt signal is wrong；Check results are collected to control centre by n fixed station；
In all check results, as long as there being a fixed station to verify successfully, then assert that signal receives correct, control centre selects
Any one road verifies successful decoded signal and exports as final signal, if the verification of all fixed stations is all unsuccessful, in control
The heart assert signal reception failure.
2. a kind of shortwave access network is adjudicated based on hard values diversity system is it is characterised in that described system includes far-end uses
Family and shortwave access network, the fixed station comprising control centre and being distributed in different geographical in described shortwave access network, institute
State and connected by cable network between fixed station, and connect to described control centre, described fixed station is used for realizing far-end use
The wireless access at family, completes wirelessly to arrive wired conversion；
Wherein said remote subscriber includes:
Link setup networking module, for having been interacted with one of shortwave access network fixed station by asynchronously or synchronously pattern
Become link establishment and networking, after link establishment, the operating frequency between described remote subscriber and fixed station is f；
Signal transmitting module, for proceed-to-send signal, specifically, carrying out successively verifying, encoding, accord with to the signal needing to send
Number mapping, scrambled code, modulation, up-conversion, power amplification are processed, and then launch the signal after processing；
Wherein said fixed station includes:
Frequency sending module, for being sent described operating frequency f to control centre by cable network；
Process judging module, for receipt signal under being uniformly controlled of the heart in the controlling, and the signal receiving processed,
Including being filtered successively, down coversion, demodulation, descrambling, inverse mapping, decoding and checking treatment, obtain decoded signal and verification knot
Really, and according to check results make decisions；If verifying successfully, judge that receipt signal is correct；If verifying unsuccessfully, judge to receive
Signal is wrong；Then check results are collected to control centre；
Wherein said control centre includes:
Select setup module, for number of path n of receipt signal as needed, in selected shortwave access network, other n-1 are individual solid
Determine the station, and the operating frequency of this n-1 fixed station is set to f, n fixed station forms a receiving platform altogether here
Stand set；
Signal output module, in all check results, as long as there being a fixed station to verify successfully, then assert that signal connects
Receive correct, select any one road to verify successful decoded signal and export as final signal, if all fixed stations verify not
Success, assert signal reception failure.
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| CN106102132B (en) * | 2016-06-12 | 2020-01-14 | 广州海格通信集团股份有限公司 | Short wave networking realization method for short wave intelligent frequency selection and diversity |
| CN106376056B (en) * | 2016-09-13 | 2020-02-14 | 广州海格通信集团股份有限公司 | Method for realizing short wave quick link establishment system |
| CN106712828B (en) * | 2016-11-25 | 2020-08-04 | 西安烽火电子科技有限责任公司 | Geographical diversity receiving system and method of short wave frequency |
| CN108307372B (en) * | 2018-01-18 | 2021-04-23 | 陕西烽火实业有限公司 | Multi-path comprehensive processing short wave emergency communication system and method |
| CN110071752B (en) * | 2019-03-07 | 2022-08-12 | 中国人民解放军陆军工程大学 | Short wave multi-station fusion receiving low fault tolerance rapid combination method |
| CN110048809B (en) * | 2019-03-07 | 2022-02-22 | 中国人民解放军陆军工程大学 | Dynamic transmission method for error-free fusion receiving of short wave multi-station |
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| CN101977070A (en) * | 2010-10-18 | 2011-02-16 | 南京大学 | Short-wave cooperative detection system |
| CN103297115B (en) * | 2013-05-29 | 2016-01-06 | 西安烽火电子科技有限责任公司 | A kind of shortwave wide area diversity receiving device and method of reseptance thereof |
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