Multimodality fusion terminal and method based on software radio and soft hand-offTechnical field
The present invention relates to emergency communication fields, and in particular to a kind of emergency communication method and multimode of the multimodality fusion of terminalConvergent terminal.
Background technique
In recent years, the natural calamities such as earthquake take place frequently, communication becomes the technological means of most critical, and not communicating can not just knowKnow the situation at scene and carry out rescue and relief work, under the application scenarios such as field or coal mine, it is logical to realize to establish emergency communication systemLetter and rescue are of great significance.
Mainly pass through Emergency communication vehicle in rescue site at present and reach scene, communication link is established by Emergency communication vehicleIt connects, however the place that Emergency communication vehicle is lacked or can not be reached is difficult to establish local communication network rapidly, is emergency repairFaster networking measure is provided.
Due to terminal do not have emergency communication function and ability, under emergency environmental, section communication mode be destroyed orSignal is difficult to penetrate barrier transmission under emergency environmental due to communication mode, and can not achieve emergency communication.
Summary of the invention
In view of the above problem of the prior art, according to one aspect of the present disclosure, based on software radio and softHandoff technique provides a kind of emergency method of multimodality fusion, and public network mobile communication terminal, cluster communication terminal, Beidou communication is wholeIt holds, the communication function of satellite communication terminal is fused together, the terminal multi-mode communication of the comprehensive various different communication standards of foundation.ThisInvention uses following technical scheme: one kind being based on software radio and soft hand-off multimodality fusion method, can be applied to meet an urgent needIn communication, it is characterised in that:
It carries out the communication channel for a variety of communication standards that terminal is supported to be aggregated to form channel list, and stores；
Multi-mode subchannel extractor extracts channel capacity according to the channel list；
When finding that a certain channel condition can support communication, that is, it is communicated to communication mode corresponding with the channel and is led toLetter.
Further, when discovery to more preferable channel capacity channel when and holding the first preset duration, then cutIt changes, otherwise without switching.
Further, the first order of multi-mode subchannel extractor is by least one improved cic filter and at leastOne compensating filter is formed by cascade, and the second level is formed by least one FIR filter；The first order and describedSecond level cascade.
Wherein, the plurality of communication schemes of the support includes 2G/3G/4G/5G mobile communication, cluster communication, Beidou/satelliteCommunication, low frequency emergency communication etc..
Disclosed another aspect according to the present invention, provides a kind of multimodality fusion based on software radio and soft hand-offTerminal, it is characterised in that:
Including extraction unit, multi-mode subchannel extractor, RF analog processing unit, ADC module, baseband processing unit, controlUnit and multi-mode communication module processed, the RF analog processing unit, the ADC module cascade, the subchannel extractor cascades,The baseband processing unit, control unit, multi-mode communication unit successively cascade；
The extraction unit extracts the communication channel under various standards according to the communication standard that terminal is supported, forms channelList；
Wherein, multi-mode subchannel extractor, including realizing the first order of restructural filtering extraction and realizing channel selection filterThe second level of wave is constituted, can be flexibly according to extracting channel in channel list；
Control unit judges whether signal-to-noise ratio is more than a certain preset threshold according to the result of subchannel extractor, and is being more thanControl is connect with the communication pattern of the respective channels of multi-mode communication unit when preset threshold；And when a certain channel condition of discovery canWhen supporting communication, i.e., soft handover is communicated to communication mode corresponding with the channel.
Particularly, further include relay unit, connect with control unit, the signal of other multimodality fusion terminals can be carried outRelay transmission, the relay transmission mode include that amplification retransmits or decode re-transmission.
Further, the multi-mode communication unit includes 2G/3G/4G/5G mobile communication module, cluster communication module, northBucket/satellite communication module, low frequency emergency communication module, the mode that control unit can select one select the company of certain communication moduleIt is logical.
Technical effect
1, it the problem of can only communicating under single communication standard the present invention overcomes past terminal, can be applied to meet an urgent needThe scene of communication merges a variety of communication standards well, and greatly improving can communication capacity.
2, can in real time to supporting the communication channel under standard be monitored, the case where according to channel capacity, with software withoutThe theory of line electricity and the mode of soft handover are quickly switched on better channel.
3, terminal of the invention also has relay function, can autonomous transmission Path selection, greatly improve emergency communication ringCommunication capacity under border.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show belowThere is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only thisSome embodiments of invention for those of ordinary skill in the art without creative efforts, can be withIt obtains other drawings based on these drawings.
Fig. 1 is terminal multimodality fusion method flow diagram of the invention
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is done further with reference to the accompanying drawingGround detailed description.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the inventionMade any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Embodiment 1
As shown in Figure 1, one aspect of the present invention, which provides one kind, is based on software radio and soft hand-off multimodality fusion method,It can be applied in emergency communication, it may be convenient to realize to the channel monitoring under a variety of communication standards, switching, improve Continued communicationGuarantee, it is characterised in that the following steps are included:
Step S1 carries out the communication channel for the plurality of communication schemes that terminal is supported to be aggregated to form channel list, and stores；
Since the standard that terminal is supported is limited, the common frequency range that multiple types are communicated, collection summarizes various communication standardsAnd communication channel, establish communication channel list.The channel list includes communication standard title, frequency spectrum designation, channel name.ThisThe terminal of invention can have relay function, can construct different communication links by the forwarding of itself or other terminals,Therefore, the different terminals situation that can be also communicated according to surrounding, dynamically updates the channel list.
Step S2, multi-mode subchannel extractor extract channel capacity, the subchannel extractor packet according to the channel listIt includes the first order for realizing restructural filtering extraction and realizes the second level of channel selection filtering, to realize what flexible channel extractedSoftware-controllable；
Due to traditional subchannel extractor, some channel of user at a time can only be only extracted, and remainingChannel is not utilized, and this method lacks flexibility, and resource utilization is not high, and subchannel extractor works in the number of receiverWord front end obtains channel capacity by height sampling.Respective tones are obtained with output end by changing prime filter extraction coefficientThe software radio receiver of band can extract flexibly reconstruct to channel.The subchannel extractor is made of two-stage: prime realization can weighStructure filtering extraction is cascaded by a cic filter or a compensating filter；Rear class realizes letter by a FIT filterRoad selection.
Step S3, when finding that a certain channel condition can support communication, i.e. soft handover to communication corresponding with the channelMode is communicated.
Specifically, a settable preset threshold, when channel condition is higher than the preset threshold, showing can be by the letterRealize communication in road.
Preferably, soft handover has more preferable communication to described when finding that another channel has better communication conditionThe corresponding communication mode communication of channel.Preferably, when discovery to more preferable channel capacity channel when and keep first presetDuration then switches over, otherwise without switching.
Further, due to terminal of the invention have relay function, can amplification retransmit or decoding retransmit by way of,The autonomous Network Communication of midsequent is established, when nearby finding other terminals, it may appear that corresponding channel.When channel condition is preferable,The present invention can obtain the connection ability of the link terminal, when it can realize correspondence with foreign country directly or by other terminals,Information is obtained by Signalling exchange, and when terminal is unable to correspondence with foreign country, the correspondence with foreign country by way of relayed communications.
Wherein, the plurality of communication schemes of the support includes 2G/3G/4G/5G mobile communication, cluster communication, Beidou/satelliteCommunication, low frequency emergency communication etc..The terminal can be mobile phone, PDA, PC and communication terminal special.
Embodiment 2
Disclosed another aspect according to the present invention, provides a kind of multimodality fusion based on software radio and soft hand-offTerminal, it is characterised in that:
Including extraction unit, multi-mode subchannel extractor, RF analog processing unit, ADC module, baseband processing unit, controlUnit and multi-mode communication module processed, the RF analog processing unit, the ADC module cascade, the subchannel extractor cascades,The baseband processing unit, control unit, multi-mode communication unit successively cascade；
The extraction unit extracts the communication channel under various standards according to the communication standard that terminal is supported, forms channelList；
Wherein, multi-mode subchannel extractor, including realizing the first order of restructural filtering extraction and realizing channel selection filterThe second level of wave is constituted, can be flexibly according to extracting channel in channel list；
Control unit judges whether signal-to-noise ratio is more than a certain preset threshold according to the result of subchannel extractor, and is being more thanControl is connect with the communication pattern of the respective channels of multi-mode communication unit when preset threshold；And when a certain channel condition of discovery canWhen supporting communication, i.e., soft handover is communicated to communication mode corresponding with the channel.
Particularly, further include relay unit, connect with control unit, the signal of other multimodality fusion terminals can be carried outRelay transmission, the relay transmission mode include that amplification retransmits or decode re-transmission.
Further, the multi-mode communication unit includes 2G/3G/4G/5G mobile communication module, cluster communication module, northBucket/satellite communication module, low frequency emergency communication module, the mode that control unit can select one select the company of certain communication moduleIt is logical.
More than, the present invention is described in conjunction with specific embodiments, the embodiment introduced is used to help understand this hairBright thought.The detail being not limited in above embodiments of the invention, the done letter of any design according to the inventionMonotropic shape all belongs to the scope of protection of the present invention.