CN102045735A - Method and unit for realizing automatic frequency detection network creation in frequency hopping radio network - Google Patents
Method and unit for realizing automatic frequency detection network creation in frequency hopping radio network Download PDFInfo
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Abstract
The invention discloses a method for realizing automatic frequency detection network creation in a frequency hopping radio network. The method comprises the following stages of: (1) network creation searching; (2) channel quality feedback; (3) main radio decision; and (4) frequency selection result. The invention also discloses a unit for realizing the automatic frequency detection network creation in the frequency hopping radio network. By the method, frequency detection is automatically started particularly in a severe electromagnetic environment, and an effective means is provided for successful network creation communication for multiple users.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of automatic frequency of in the frequency hopping radio set network, realizing and survey the method and the unit of networking.
Background technology
In all application and service of mobile communication equipment, network connects and corresponding data, services is the service of the active demand of mobile subscriber.Current, the great majority connection between most of wireless devices provides by static infrastructure or dedicated network is realized.The dynamic spy of environment such as military combat, earthquake and the disaster relief means that these application can not rely on the visit communications infrastructure fixing, that set up in advance, this just proposes new requirement to communication equipment, do not need the infrastructure support, dynamically MANET and network must rapid deployments.This just requires mobile communication equipment under the landform and complex electromagnetic environments of the unknown, can the quick detection frequency spectrum, avoid the relatively poor frequency of communication quality, and effectively guarantee each internodal reliable communication and higher communication rate.Existing spectrum detection scheme is primarily aimed at the point-to-point communication based on up-downgoing channel symmetry, and system is just searched for several one-way channels.These schemes also are not suitable for the Ad hoc network of being made up of the multi-section mobile communication equipment.
In the Ad hoc network application, the network coverage that a plurality of nodes are formed is wider, per two internodal available frequencies and up-downgoing channel quality are all inequality, and near the channel situation each node just must be verified by system before networking, whole system is always worked on the reliable frequency.
Summary of the invention
The present invention is in order to overcome the deficiency that above prior art exists, provide a kind of automatic frequency of in the frequency hopping radio set network, realizing to survey the method for networking, especially under abominable electromagnetic environment, begin frequency sonding automatically, for multi-user's success networking communication provides a kind of effective means.
Another object of the present invention is to provide a kind of automatic frequency of in the frequency hopping radio set network, realizing to survey the unit of networking.
The present invention uses the internal structure of equipment to adopt the printed board motherboard to add the scheme of unit box.Adopt based on the hardware architecture of hardware bus with based on the software architecture on the embedded real-time operating system in the radio station, realize modularization, can expand, can inherit, transplantable opening, general system architecture, realize high-speed frequency-hopping, high speed data transfer, networking agreement and multiple business function on this basis.
A kind of automatic frequency of realizing in the frequency hopping radio set network is surveyed the method for networking, it is characterized in that comprising with the next stage:
(1) the search networking stage: the beginning automatic frequency is surveyed networking, at first the radio station operation information is set by human-computer interaction module, after the master control submodule is received operation information, information decomposition is become a series of built-in commands, and the coherent signal processing of control figure signal processing submodule startup Access Layer and physical layer, the digital signal processing sub module sends and surveys received signal according to signal processing results control channel module on frequency that designs or frequency range; Detailed process is as follows:
1., initial probe is synchronous, at main platform with from setting up unified clock between the platform, makes the frequency hopping Frequency Synchronization, and the synchronous reception of physical layer is carried out smoothly; Main platform sends synchronizing information by channel module at N frequency hop-by-hop surveying frequency range, respectively enters long search procedure from platform, receives main platform networking synchronizing information with fixing frequency window; After capturing main platform networking synchronizing information, upgrade the system information of oneself from platform, keep synchronously with main platform, and enter the hop-by-hop receiving course; Every all has separately networking timing from platform; Main platform carries out 64 and takes turns transmission, grows synchronous searching from platform at random 64 frequencies of selection from 256 frequencies, like this from platform all once long synchronous motor meeting on each frequency; On each frequency, grow synchronous searching from platform, search for successfully, through RS16 (15 up to synchronous Pn with fixing 256ms, 11) after the decoding, if the CRC check success is then thought and received detection jumping synchronously, initial synchronisation is finished, otherwise thinks false-alarm, proceeds long synchronous searching;
2., after initial synchronisation finishes, the TON information and the main platform that will upgrade self from platform are consistent, with the least-significant byte of current frequency sequence number as TON, high 24 information in conjunction with TON in the receiving synchronous information obtain total TON information;
3., after the initial synchronisation success, on 256 frequencies, receive successively, the assessment down channel quality is represented with 1bit; Adopt the mode of majority decision, the channel quality of each frequency is initialized as 0, and every successfully reception once then adds 1, otherwise subtracts 1; Last takes turns circulation time, carries out symbol judgement, greater than 0, show that this frequency can use, otherwise this frequency is unavailable as the accumulative total channel quality value; Write down the down channel quality that will feed back with 256bit, the sequence number of the corresponding frequency in each bit position, value are 1 to show that this frequency can use, and value is 0 to show that this frequency is unavailable; Each feedback information from platform needs 32 byte transmission altogether;
(2) the channel-quality feedback stage:, deliver in the digital signal processing sub module and handle the signal that receives by channel module from platform, count the downlink quality of each frequency, again these information are sent to main platform successively by channel module on each frequency; Be divided into 512 jumpings from the feedback time slot of platform, send on 254 frequencies successively, being divided into is the two-wheeled transmission, and the first round is used for sending feedback jumping synchronously, makes main stylobate originally with from the platform success synchronously; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the feedback information of 32 bytes and the CRC check information of 1 byte; Main platform receives feedback channel information successively by channel module on each frequency, simultaneously by digital signal processing sub module estimation uplink signal-channel quality, because carry out the frequency-selecting decision-making at main platform, uplink signal-channel quality information is represented with 4bit, obtains according to the snr computation in the channel estimation process; Channel quality information with each frequency passes to the master control submodule successively; After the end of platform feedback stage, enter the reception stage of frequently showing from platform, the frequency table that receives main platform transmission successively on 256 frequencies is jumped synchronously, withdraws from detection mode up to manual operation, carries out frequency hopping communications according to received frequency table; If do not receive table frequently, then carry out frequency hopping with former frequency table;
(3) the main platform decision phase: after feedback procedure is finished, the digital module of main platform obtains 10 channel quality assessment tables altogether, comprise the down channel quality table of 51 bits and the uplink signal-channel quality table of 54 bits, frequency-selecting decision-making mode being provided with by human-computer interaction module draws final frequency-selecting result;
(4) frequency-selecting result issues the stage: the frequency-selecting result issues and is meant that main platform is handed down to each from platform by channel module at full frequency band with the frequency-selecting result in the digital module, result with main platform decision-making is saved in the digital module from platform, and configuration frequency hopping is separately shown to use for channel module frequently;
1., main platform repeats to send 5 and takes turns and frequently show time slot, every time slot is divided into 512 jumps, and sends on 256 frequencies successively; Be divided into two-wheeled and send, the first round is used for transmission to be shown to jump synchronously frequently, makes from stylobate originally synchronous with main platform success; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the frequency table information of 32 bytes and the CRC check information of 1 byte; The structure that the frequency table data that main platform sends are jumped is identical with the feedback data jumping structure that sends from platform; Frequently after table issued the stage end, main platform entered receipts state on duty, withdraws from detection mode up to manual operation, carries out normal frequency hopping communications with new frequency table;
2., adopting main platform select frequency automatically decision-making, decision-making time is 1024 to jump; Main platform distribute 64 take turns survey jump synchronously after, as fail to receive feedback information from platform, through the fixing main platform decision-making time with after frequently showing transmitting time, continue to send 64 and take turns to survey synchronously and jump, until the feedback information of receiving from platform;
Perhaps adopt the frequency-selecting of manual type to make a strategic decision, enter detection mode transmission 64 and take turns the synchronous jumping of detection,, enter detection mode transmission 64 once more and take turns the synchronous jumping of detection, until the feedback information of receiving from platform if fail to receive from the platform feedback information.
Institute in steps after, to add plurality of data at slow networking time slot and jump to transmit used frequency table information, make can cutting frequently with new frequency hopping table of slow networking from platform.
Frequency-selecting decision-making in the described step (3) is manual type or automated manner frequency-selecting:
The manual type frequency-selecting: these ten tables are outputed to terminal, select frequency by main platform operator, as the frequency table of final selection, the decision-making time is unfixing;
The automated manner frequency-selecting: pick out main platform and each common factor from the best frequency subsets of channel quality between the platform automatically by the decision making algorithm of reserving in advance, as the frequency table of final selection, the decision-making time is fixed.
The decision-making time of described automated manner frequency-selecting is set at 1024ms, and final selecteed frequency table is stored with 32Byte=256Bit, and each bit represents whether the frequency of this sequence number is selected.
In the frequency hopping radio set network, realize the unit of automatic frequency detection networking, it is characterized in that: comprise main platform detection networking unit and survey the networking unit from platform, described main platform is surveyed the networking unit, all comprises mainboard, human-computer interaction module, digital module and channel module from platform detection networking unit that human-computer interaction module, digital module, channel module are connected with mainboard;
Digital module is the core in whole radio station, comprises interconnective master control submodule and digital signal processing sub module;
The master control submodule, comprise interconnective kernel module, plate level support package (BSP, BoardSupport Packet) module, and the control interface module that is connected with kernel module respectively, data interface module, channel access module, routing module, gateway module;
Mainboard, the passage of transfer of data between the module;
Human-computer interaction module, main control command, data and the voice service that receives from the outside, again it is mail to mainboard, also receive state information that mainboard reports simultaneously and the state information that is received is shown, receive speech that mainboard reports and data service and the outside is sent in the speech and the data service that are received;
Channel module mainly provides frequency down-conversion function, and intermediate-freuqncy signal and radiofrequency signal are changed mutually;
The digital signal processing sub module, controlled by the master control submodule, receive data and voice service that the master control submodule issues, handle the back and produce intermediate-freuqncy signal, and described intermediate-freuqncy signal is sent to radio station analog module, the intermediate-freuqncy signal that radio station analog module is brought is handled simultaneously, extract data and speech information, be sent to the master control submodule, the radio station digital signal processing module reports various state informations and radio station analog module is carried out corresponding control toward the master control submodule according to demand;
Kernel module as the interface between operating system and the hardware environment, has been finished the work of hardware initialization, and kernel module is supported operating system, self-defining public variable and function, for each software function module provides unified interaction platform;
Plate level support package module mainly is the support that realizes operating system, for the driver on upper strata provides the function bag of access hardware devices register, makes plate level support package module can better run on mainboard;
The control interface module receives the control command of human-computer interaction module, and reports the radio station state to human-computer interaction module;
Data interface module receives the data from human-computer interaction module, selects different transmit queues according to data type, and receives the data that other module need report, and is sent to human-computer interaction module and exports;
The channel access module, selection inserts the opportunity of radio station channel, avoids collision;
Routing module is realized the DSR Routing Protocol, realizes selection, maintenance and the renewal of route;
Gateway module is realized selection, maintenance and the renewal of gateway;
Described master control submodule comprises the ARM chip, the network interface control chip.
Described digital signal processing sub module comprises dsp chip TMS320C6416, fpga chip XC4VSX35, AD chip AD9862.
Described detection networking unit also comprises frequency compound module, DC power supplier, power amplifier module, the AC power supply module that is connected with mainboard;
Frequently compound module provides accurately stable frequency for digital baseband signal, intermediate-freuqncy signal and channel are synthetic;
DC power supplier is converted into the direct voltage that other modules need with fixing direct voltage;
Power amplifier module, the signal power that channel module is provided is amplified to the user grade is set, and the interface that is connected with antenna is provided;
AC power supply module is converted into direct voltage with AC supply voltage, uses for DC power supplier.
Frequently compound module, DC power supplier, power amplifier module, AC power supply module belong to the basic guarantee module, for the radio station provides basic intermediate frequency, power amplification, guarantees such as power of alterating and direct current, human-computer interaction module, digital module, channel module belong to functional module, realize concrete function by the mutual cooperation between three functional modules, the inventive method mainly designs and concentrates in these three modules.
The present invention has following advantage with respect to prior art:
Main platform repeats to send initial probe on full frequency band synchronous, begins long search networking from platform; Main platform down channel quality after the networking of platform statistics sends to main platform with statistics again on full frequency band, main platform then receives each result from platform at times on full frequency band, and respectively statistics respectively from the uplink signal-channel quality of platform; Main platform is made a strategic decision according to different strategies according to respectively from the uplink and downlink channel result of platform; Main platform issues the frequency sonding result to each from platform, receives and preserve result of detection from platform at full frequency band.Use this method can make user in the frequency hopping radio set network can quick detection go out available frequency under the instant environment, effectively guaranteed each internodal reliable communication.
At first, realize the method for automatic frequency detection networking in this frequency hopping radio set network, allow network radio station under networking model, associating multi-section radio station is surveyed full working frequency range, and the response time is short, the efficient height.
Secondly, the present invention surveys two-way channel simultaneously, and reciprocal process is simple and reliable, and frequency sonding result is accurate.
Moreover the present invention is adapted under the complex electromagnetic environment, and such as the strong electromagnetic compacting, the alpine terrain of fluctuating under the conditions such as low latitudes hygrothermal environment area, all passes through sufficient experimental verification, improves the reliability of multi-section radio station success group-net communication greatly.
At last, the frequency sonding pattern need not independent configuration by user terminal selecting, the automaticity height, and frequency sonding result is shown that by user interface the user can select to use as the case may be.
Description of drawings
Fig. 1 is that the automatic frequency of realizing in the frequency hopping radio set network of the present invention is surveyed the module frame chart of networking.
Fig. 2 is the radio station group network topological structure.
Fig. 3 is detection mode structure of time slot figure.
Fig. 4 is search networking stage structure of time slot figure.
Fig. 5 is channel-quality feedback stage structure of time slot figure.
Fig. 6 is the main information structure chart of jumping synchronously from the platform feedback.
Fig. 7 is the main information structure chart of jumping from the platform feedback data.
Fig. 8 is that the frequency sonding result issues the stage time slot map.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Detection networking method of the present invention comprised with the next stage:
(1) the search networking stage: the beginning automatic frequency is surveyed networking, at first the radio station operation information is set by human-computer interaction module, after the master control submodule is received operation information, information decomposition is become a series of built-in commands, and the coherent signal processing of control figure signal processing submodule startup Access Layer and physical layer, the digital signal processing sub module sends and surveys received signal according to signal processing results control channel module on frequency that designs or frequency range; Detailed process is as follows:
1., initial probe is synchronous, at main platform with from setting up unified clock between the platform, makes the frequency hopping Frequency Synchronization, and the synchronous reception of physical layer is carried out smoothly; Main platform sends synchronizing information by channel module at N frequency hop-by-hop surveying frequency range, respectively enters long search procedure from platform, receives main platform networking synchronizing information with fixing frequency window; After capturing main platform networking synchronizing information, upgrade the system information of oneself from platform, keep synchronously with main platform, and enter the hop-by-hop receiving course; In this process, every all inequality because of environment distance of living in from platform, the time that networks is also not necessarily identical, therefore, every all has separately networking timing (the prior art from platform, main platform will carry out 256 takes turns transmission and could guarantee from platform all once long synchronous motor meeting on each frequency, needs about 66s just can finish altogether, and time delay is too big); Main platform carries out 64 and takes turns transmission in this programme, have only 64 frequencies to have an opportunity to grow synchronously at most from platform, for avoiding a certain section all disabled badness of frequency, grow synchronous searching from platform at random 64 frequencies of selection from 256 frequencies, like this from platform all once long synchronous motor meeting on each frequency; On each frequency, grow synchronous searching from platform, search for successfully, through RS16 (15 up to synchronous Pn with fixing 256ms, 11) after the decoding, if the CRC check success is then thought and received detection jumping synchronously, initial synchronisation is finished, otherwise thinks false-alarm, proceeds long synchronous searching;
2., after initial synchronisation finishes, the TON information and the main platform that will upgrade self from platform are consistent, with the least-significant byte of current frequency sequence number as TON, high 24 information in conjunction with TON in the receiving synchronous information obtain total TON information;
3., after the initial synchronisation success, on 256 frequencies, receive successively, the assessment down channel quality is represented with 1bit; Adopt the mode of majority decision, the channel quality of each frequency is initialized as 0, and every successfully reception once then adds 1, otherwise subtracts 1; Last takes turns circulation time, carries out symbol judgement, greater than 0, show that this frequency can use, otherwise this frequency is unavailable as the accumulative total channel quality value; Write down the down channel quality that will feed back with 256bit, the sequence number of the corresponding frequency in each bit position, value are 1 to show that this frequency can use, and value is 0 to show that this frequency is unavailable; Each feedback information from platform needs 32 byte transmission altogether;
(2) the channel-quality feedback stage:, deliver in the digital signal processing sub module and handle the signal that receives by channel module from platform, count the downlink quality of each frequency, again these information are sent to main platform successively by channel module on each frequency; Be divided into 512 jumpings from the feedback time slot of platform, send on 254 frequencies successively, being divided into is the two-wheeled transmission, and the first round is used for sending feedback jumping synchronously, makes main stylobate originally with from the platform success synchronously; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the feedback information of 32 bytes and the CRC check information of 1 byte; Main platform receives feedback channel information successively by channel module on each frequency, simultaneously by digital signal processing sub module estimation uplink signal-channel quality, because carry out the frequency-selecting decision-making at main platform, uplink signal-channel quality information is represented with 4bit, obtains according to the snr computation in the channel estimation process; Channel quality information with each frequency passes to the master control submodule successively; After the end of platform feedback stage, enter the reception stage of frequently showing from platform, the frequency table that receives main platform transmission successively on 256 frequencies is jumped synchronously, withdraws from detection mode up to manual operation, carries out frequency hopping communications according to received frequency table; If do not receive table frequently, then carry out frequency hopping with former frequency table;
(3) the main platform decision phase: after feedback procedure is finished, the digital module of main platform obtains 10 channel quality assessment tables altogether, comprise the down channel quality table of 51 bits and the uplink signal-channel quality table of 54 bits, frequency-selecting decision-making mode being provided with by human-computer interaction module draws final frequency-selecting result;
(4) frequency-selecting result issues the stage: the frequency-selecting result issues and is meant that main platform is handed down to each from platform by channel module at full frequency band with the frequency-selecting result in the digital module, result with main platform decision-making is saved in the digital module from platform, and configuration frequency hopping is separately shown to use for channel module frequently;
1., main platform repeats to send 5 and takes turns and frequently show time slot, every time slot is divided into 512 jumps, and sends on 256 frequencies successively; Be divided into two-wheeled and send, the first round is used for transmission to be shown to jump synchronously frequently, makes from stylobate originally synchronous with main platform success; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the frequency table information of 32 bytes and the CRC check information of 1 byte; The structure that the frequency table data that main platform sends are jumped is identical with the feedback data jumping structure that sends from platform; Frequently after table issued the stage end, main platform entered receipts state on duty, withdraws from detection mode up to manual operation, carries out normal frequency hopping communications with new frequency table;
2., to adopt main platform select frequency automatically decision-making, decision-making time be 1024 to jump, then the maximum probe time is about 23; Main platform distribute 64 take turns survey jump synchronously after, as fail to receive feedback information from platform, through the fixing main platform decision-making time with after frequently showing transmitting time, continue to send 64 and take turns to survey synchronously and jump, until the feedback information of receiving from platform;
Perhaps adopt the frequency-selecting of manual type to make a strategic decision, enter detection mode transmission 64 and take turns the synchronous jumping of detection,, enter detection mode transmission 64 once more and take turns the synchronous jumping of detection, until the feedback information of receiving from platform if fail to receive from the platform feedback information.
Institute in steps after, to add plurality of data at slow networking time slot and jump to transmit used frequency table information, make can cutting frequently with new frequency hopping table of slow networking from platform.
Frequency-selecting decision-making in the described step (3) is manual type or automated manner frequency-selecting:
The manual type frequency-selecting: these ten tables are outputed to terminal, select frequency by main platform operator, as the frequency table of final selection, the decision-making time is unfixing;
The automated manner frequency-selecting: pick out main platform and each common factor from the best frequency subsets of channel quality between the platform automatically by the decision making algorithm of reserving in advance, as the frequency table of final selection, the decision-making time is fixed.
The decision-making time of described automated manner frequency-selecting is set at 1024ms, and final selecteed frequency table is stored with 32Byte=256Bit, and each bit represents whether the frequency of this sequence number is selected.
As shown in Figure 1, in the frequency hopping radio set network, realize the unit of automatic frequency detection networking, comprise main platform detection networking unit and survey the networking unit from platform, described main platform is surveyed the networking unit, all comprises mainboard, human-computer interaction module, digital module and channel module from platform detection networking unit that human-computer interaction module, digital module, channel module are connected with mainboard;
Digital module is the core in whole radio station, comprises interconnective master control submodule and digital signal processing sub module;
The master control submodule, comprise interconnective kernel module, plate level support package (BSP, BoardSupport Packet) module, and the control interface module that is connected with kernel module respectively, data interface module, channel access module, routing module, gateway module;
Mainboard, the passage of transfer of data between the module;
Human-computer interaction module, main control command, data and the voice service that receives from the outside, again it is mail to mainboard, also receive state information that mainboard reports simultaneously and the state information that is received is shown, receive speech that mainboard reports and data service and the outside is sent in the speech and the data service that are received;
Channel module mainly provides frequency down-conversion function, and intermediate-freuqncy signal and radiofrequency signal are changed mutually;
The digital signal processing sub module, controlled by the master control submodule, receive data and voice service that the master control submodule issues, handle the back and produce intermediate-freuqncy signal, and described intermediate-freuqncy signal is sent to radio station analog module, the intermediate-freuqncy signal that radio station analog module is brought is handled simultaneously, extract data and speech information, be sent to the master control submodule, the radio station digital signal processing module reports various state informations and radio station analog module is carried out corresponding control toward the master control submodule according to demand;
Kernel module as the interface between operating system and the hardware environment, has been finished the work of hardware initialization, and kernel module is supported operating system, self-defining public variable and function, for each software function module provides unified interaction platform;
Plate level support package module mainly is the support that realizes operating system, for the driver on upper strata provides the function bag of access hardware devices register, makes plate level support package module can better run on mainboard;
The control interface module receives the control command of human-computer interaction module, and reports the radio station state to human-computer interaction module;
Data interface module receives the data from human-computer interaction module, selects different transmit queues according to data type, and receives the data that other module need report, and is sent to human-computer interaction module and exports;
The channel access module, selection inserts the opportunity of radio station channel, avoids collision;
Routing module is realized the DSR Routing Protocol, realizes selection, maintenance and the renewal of route;
Gateway module is realized selection, maintenance and the renewal of gateway;
Described master control submodule comprises the ARM chip, the network interface control chip.
Described digital signal processing sub module comprises dsp chip TMS320C6416, fpga chip XC4VSX35, AD chip AD9862.
Described detection networking unit also comprises frequency compound module, DC power supplier, power amplifier module, the AC power supply module that is connected with mainboard;
Frequently compound module provides accurately stable frequency for digital baseband signal, intermediate-freuqncy signal and channel are synthetic;
DC power supplier is converted into the direct voltage that other modules need with fixing direct voltage;
Power amplifier module, the signal power that channel module is provided is amplified to the user grade is set, and the interface that is connected with antenna is provided;
AC power supply module is converted into direct voltage with AC supply voltage, uses for DC power supplier.
Below present embodiment is done more detailed description:
The present invention surveys whole Frequency points of lower channel on interior each radio station node of the interior the whole network of full working frequency range simultaneously.The radio station group network topological structure of a practical application as shown in Figure 2, two internodal connecting lines are represented the data link of two node proper communications.All nodes all connect subscriber terminal equipment and messaging device, subscriber terminal equipment provides the interface of user and the man-machine information interaction of equipment, messaging device mails to radio station (main platform) with this nodal information as real time data, simultaneously constantly receive peripheral nodal information, this node (from platform) information and all mid-side nodes (from platform) information are carried out aggregation process from the radio station.
The user disposes on terminal equipment, the radio station is cut into detection mode after, the radio station enters the frequency sonding flow process, specifically comprises the synchronous networking of initial probe, channel-quality feedback, decision-making of main platform and frequency-selecting result issue four-stage, as Fig. 3.
(1) the search networking stage
System begins automatic frequency and surveys networking, at first the radio station operation information is set by human-computer interaction module, after the master control submodule is received operation information, information decomposition is become a series of built-in commands, and the coherent signal processing of control figure signal processing submodule startup Access Layer and physical layer, the digital signal processing sub module sends and surveys received signal according to signal processing results control channel module on frequency that designs or frequency range.Initial probe is mainly used in main platform synchronously and from setting up unified clock between the platform, guarantees the frequency hopping Frequency Synchronization, guarantees that the synchronous reception of physical layer can be carried out smoothly.Main platform surveying frequency range (N frequency) hop-by-hop transmission synchronizing information, respectively enters long search procedure from platform by channel module, receives main platform networking synchronizing information with fixing frequency window.After capturing main platform networking synchronizing information, upgrade the system information of oneself from platform, keep synchronously with main platform, and enter the hop-by-hop receiving course.In this process, every from platform because environment of living in distance is all inequality, the time of networking is also not necessarily identical, therefore, every all has separately networking timing from platform.Detailed process such as Fig. 4.
Require main platform constantly just to begin to send to survey synchronously at Ton%256==0 and jump, then the least-significant byte of Ton is identical with current frequency sequence number.Main information structure following table is jumped in the detection that main platform sends synchronously:
Every jumping is totally 44 bit, carries out RS16 (15,11) coding, carries out TCM-8PSK then and is encoded to 34 symbols, utilizes loop ends index bit to indicate last transmission circulation.
Bit43-42: wheel synchronization type information, 00: main platform sends to survey synchronously jumps 01: jump synchronously from the feedback that platform sends; 10: main platform issues the synchronous jumping in the stage of frequently showing, and 11: keep.
Bit41-18: high 24 when skip before TON information is used for clock being adjusted to consistent with main platform from platform;
Bit17: indicate whether the residing circulation of current frequency is that last takes turns 1: be 0: not.
Bit16: keep the position, stand-by, be fixed as 1.
Bit15-0:16 bit CRC check information.
Owing to adopted identical synchronous Pn sign indicating number, for the synchronous jumping with the proper communication stage distinguishes, mask process all will be carried out in the CRC check position of jumping synchronously in the whole detection frequency-selecting process, soon a CRC check result and a permanent mask value (for example 0x5555 can not repeat with the mask in the logical dress system) carry out exporting behind the XOR.Employing is placed on ad-hoc location with the position of CRC.
In theory, main platform will carry out 256 takes turns transmission and could guarantee from platform all once long synchronous motor meeting on each frequency, needs about 66s just can finish altogether, and time delay is too big.Adopt 64 to take turns transmission in this programme, have only 64 frequencies to have an opportunity to grow synchronously at most, for avoiding a certain section all disabled badness of frequency, grow synchronous searching from platform at random 64 frequencies of selection from 256 frequencies from platform.
Suppose that total total M frequency can be used in 256 frequencies, the available frequency in 64 frequencies then randomly drawing is counted L and is obeyed hypergeometric distribution, L～Hygep (256, M, 64), and probability distribution is
Average is E (L)=64M/256=M/4; Institute thinks that assurance has at least a frequency to use, and requires available frequency sum will satisfy M＞4.As in 64 search frequencies selecting at random L available frequency being arranged, the probability that each frequency is not gone up synchronously is p
i, then the condition synchronous probability is
Utilize total probability formula, the initial synchronisation probability of success is
As p
i=0.5 o'clock, M=10 is P=0.7398 then; As M=20, P=0.9339 then.
As p
i=0.3 o'clock, M=10 is P=0.8574 then; As M=20, P=0.9808 then.
As p
i=0 o'clock, M=10 is P=0.9470 then; As M=20, P=0.9976 then.
On each frequency, grow synchronous searching from platform, search for successfully, through RS16 (15 up to synchronous Pn with fixing 256ms, 11) after the decoding, if the CRC check success is then thought and received detection jumping synchronously, initial synchronisation is finished, otherwise thinks false-alarm, proceeds long synchronous searching.After initial synchronisation was finished, the TON information and the main platform that will upgrade self from platform were consistent, and with the least-significant byte of current frequency sequence number as TON, high 24 information in conjunction with TON in the receiving synchronous information obtain total TON information.
After the initial synchronisation success, receive successively on 256 frequencies, the assessment down channel quality is represented with 1bit; The preliminary mode of considering to adopt majority decision, the channel quality of each frequency is initialized as 0, and every successfully reception once then adds 1, otherwise subtracts 1.Last takes turns circulation time, carries out symbol judgement, greater than 0, show that this frequency can use, otherwise this frequency is unavailable as the accumulative total channel quality value.
Write down the down channel quality that will feed back with 256bit, the sequence number of the corresponding frequency in each bit position, value are 1 to show that this frequency can use, and value is 0 to show that this frequency is unavailable; So each feedback information QualityDown from platform needs 32 byte transmission altogether.
(2) the channel-quality feedback stage
, deliver in the digital signal processing sub module and handle the signal that receives by channel module from platform, count the downlink quality of each frequency, again these information are sent to main platform successively by channel module on each frequency, as Fig. 5.
Be divided into 512 jumpings from the feedback time slot of platform, send on 254 frequencies successively, being divided into is the two-wheeled transmission, and the first round is used for sending feeds back jumping synchronously, guarantees that main platform is with high probability and synchronous from the platform success; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the feedback information of 32 bytes and the CRC check information of 1 byte.
From synchronous main information structure such as the Fig. 6 that jumps of the feedback of platform transmission.
Synchronizing information is 44bit altogether, behind RS16 (15,11) coding, gets 34 symbols with TCM-8PSK.
Bit43-42: wheel synchronization type information, 00: main platform sends to survey synchronously jumps 01: jump synchronously from the feedback that platform sends; 10: main platform issues the synchronous jumping in the stage of frequently showing, and 11: keep;
Bit41: the radio station grade, the main platform of 0 expression, 1 expression is from platform;
Bit40-38: send MAC Address from platform;
Bit37-30: current frequency is in 256 positional informations in the frequency, value 0～255;
Bit29-16: keep the position, stand-by;
Bit15-0:16 bit CRC check information;
Main information structure such as Fig. 7 that the feedback data that sends from platform is jumped.
Main platform receives feedback channel information successively by channel module on each frequency, simultaneously by digital signal processing sub module estimation uplink signal-channel quality, because carry out the frequency-selecting decision-making at main platform, uplink signal-channel quality information is represented with 4bit, obtains according to the snr computation in the channel estimation process; Channel quality information with each frequency passes to the master control submodule successively;
After the end of platform feedback stage, enter the reception stage of frequently showing from platform, the frequency table that receives main platform transmission successively on 256 frequencies is jumped synchronously, withdraws from detection mode up to manual operation, carries out frequency hopping communications according to received frequency table; If do not receive table frequently, then carry out frequency hopping with former frequency table.
(3) the main platform decision phase
After feedback procedure is finished, the digital module of main platform obtains 10 channel quality assessment tables altogether, comprise the down channel quality table of 51 bits and the uplink signal-channel quality table of 54 bits, the frequency-selecting decision-making mode that is being provided with by human-computer interaction module, draw final frequency-selecting result, and can adopt manual type or automated manner frequency-selecting.
If the manual type frequency-selecting outputs to terminal with these 10 tables, select frequency by main platform operator, the decision-making time is unfixing.If the automated manner frequency-selecting is picked out main platform and each common factor from the best frequency subsets of channel quality between the platform automatically by the decision making algorithm of reserving in advance, as the frequency table of final selection, the decision-making time is fixed, and might as well temporarily be set at 1024ms.
Final selecteed frequency table is stored with 32Byte=256Bit, and each bit represents whether the frequency of this sequence number is selected; Frequently table is issued to each from platform then.
(4) frequency-selecting result issues the stage
The frequency-selecting result issues and is meant that main platform is handed down to each from platform by channel module at full frequency band with frequency-selecting result in the digital module, and the result with main platform decision-making is saved in the digital module from platform, and configuration frequency hopping is separately shown to use for channel module frequently.
Main platform repeats to send 5 and takes turns and frequently show time slot, and every time slot is divided into 512 jumps, and sends on 256 frequencies successively, as Fig. 8.Be divided into two-wheeled and send, the first round is used for sending the frequency table jumps synchronously, guarantees from platform synchronous with high probability and the success of main platform.Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the frequency table information of 32 bytes and the CRC check information of 1 byte;
Main information structure such as following table that the frequency table that main platform sends is jumped synchronously:
Synchronizing information is 44bit altogether, behind RS16 (15,11) coding, gets 34 symbols with TCM-8PSK;
Bit43-42: wheel synchronization type information, 00: main platform sends to survey synchronously jumps 01: jump synchronously from the feedback that platform sends; 10: main platform issues the synchronous jumping in the stage of frequently showing, and 11: keep;
Bit41: the radio station grade, the main platform of 0 expression, 1 expression is from platform;
Bit40-38: the residing transmission wheel of current frequency number, value is 0～4;
Bit37-30: current frequency is in 256 positional informations in the frequency, value 0～255;
Bit29-16: keep the position, stand-by;
Bit15-0:16 bit CRC check information.
The structure that the frequency table data that main platform sends are jumped is identical with the feedback data jumping structure that sends from platform.Frequently after table issued the stage end, main platform entered receipts state on duty, withdraws from detection mode up to manual operation, carries out normal frequency hopping communications with new frequency table.
As adopt main platform select frequency automatically decision-making, and the decision-making time is 1024 jumpings, then the maximum probe time is about 23s.
Main platform distribute 64 take turns survey jump synchronously after, as fail to receive feedback information from platform, through the fixing main platform decision-making time with after frequently showing transmitting time, continue to send 64 and take turns to survey synchronously and jump, continue then according to above process flow operation.As adopt the frequency-selecting of manual type to make a strategic decision, if fail to receive, enter detection mode transmission 64 once more and take turns detection jumping synchronously from the platform feedback information;
Will add plurality of data at slow networking time slot and jump to transmit used frequency table information, what guarantee networking late can cut frequency with new frequency hopping table from platform.
Described above only is a kind of preferred embodiment of the present invention; those of ordinary skills can be under the situation that does not break away from inventive concept; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets claims.
Claims (8)
1. in the frequency hopping radio set network, realize the method for automatic frequency detection networking, it is characterized in that comprising with the next stage:
(1) the search networking stage: the beginning automatic frequency is surveyed networking, at first the radio station operation information is set by human-computer interaction module, after the master control submodule is received operation information, information decomposition is become a series of built-in commands, and the coherent signal processing of control figure signal processing submodule startup Access Layer and physical layer, the digital signal processing sub module sends and surveys received signal according to signal processing results control channel module on frequency that designs or frequency range; Detailed process is as follows:
1., initial probe is synchronous, at main platform with from setting up unified clock between the platform, makes the frequency hopping Frequency Synchronization, and the synchronous reception of physical layer is carried out smoothly; Main platform sends synchronizing information by channel module at N frequency hop-by-hop surveying frequency range, respectively enters long search procedure from platform, receives main platform networking synchronizing information with fixing frequency window; After capturing main platform networking synchronizing information, upgrade the system information of oneself from platform, keep synchronously with main platform, and enter the hop-by-hop receiving course; Every all has separately networking timing from platform; Main platform carries out 64 and takes turns transmission, grows synchronous searching from platform at random 64 frequencies of selection from 256 frequencies, like this from platform all once long synchronous motor meeting on each frequency; On each frequency, grow synchronous searching from platform, search for successfully, after RS16 decoding up to synchronous Pn with fixing 256ms, if the CRC check success thinks then and receives detection jumping synchronously that initial synchronisation is finished, otherwise think false-alarm, proceed long synchronous searching;
2., after initial synchronisation finishes, the TON information and the main platform that will upgrade self from platform are consistent, with the least-significant byte of current frequency sequence number as TON, high 24 information in conjunction with TON in the receiving synchronous information obtain total TON information;
3., after the initial synchronisation success, on 256 frequencies, receive successively, the assessment down channel quality is represented with 1bit; Adopt the mode of majority decision, the channel quality of each frequency is initialized as 0, and every successfully reception once then adds 1, otherwise subtracts 1; Last takes turns circulation time, carries out symbol judgement, greater than 0, show that this frequency can use, otherwise this frequency is unavailable as the accumulative total channel quality value; Write down the down channel quality that will feed back with 256bit, the sequence number of the corresponding frequency in each bit position, value are 1 to show that this frequency can use, and value is 0 to show that this frequency is unavailable; Each feedback information from platform needs 32 byte transmission altogether;
(2) the channel-quality feedback stage:, deliver in the digital signal processing sub module and handle the signal that receives by channel module from platform, count the downlink quality of each frequency, again these information are sent to main platform successively by channel module on each frequency; Be divided into 512 jumpings from the feedback time slot of platform, send on 254 frequencies successively, being divided into is the two-wheeled transmission, and the first round is used for sending feedback jumping synchronously, makes main stylobate originally with from the platform success synchronously; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the feedback information of 32 bytes and the CRC check information of 1 byte; Main platform receives feedback channel information successively by channel module on each frequency, simultaneously by digital signal processing sub module estimation uplink signal-channel quality, because carry out the frequency-selecting decision-making at main platform, uplink signal-channel quality information is represented with 4bit, obtains according to the snr computation in the channel estimation process; Channel quality information with each frequency passes to the master control submodule successively; After the end of platform feedback stage, enter the reception stage of frequently showing from platform, the frequency table that receives main platform transmission successively on 256 frequencies is jumped synchronously, withdraws from detection mode up to manual operation, carries out frequency hopping communications according to received frequency table; If do not receive table frequently, then carry out frequency hopping with former frequency table;
(3) the main platform decision phase: after feedback procedure is finished, the digital module of main platform obtains 10 channel quality assessment tables altogether, comprise the down channel quality table of 51 bits and the uplink signal-channel quality table of 54 bits, frequency-selecting decision-making mode being provided with by human-computer interaction module draws final frequency-selecting result;
(4) frequency-selecting result issues the stage: the frequency-selecting result issues and is meant that main platform is handed down to each from platform by channel module at full frequency band with the frequency-selecting result in the digital module, result with main platform decision-making is saved in the digital module from platform, and configuration frequency hopping is separately shown to use for channel module frequently;
1., main platform repeats to send 5 and takes turns and frequently show time slot, every time slot is divided into 512 jumps, and sends on 256 frequencies successively; Be divided into two-wheeled and send, the first round is used for transmission to be shown to jump synchronously frequently, makes from stylobate originally synchronous with main platform success; Second takes turns the transmission data jumps, and transmits 33 identical bytes during each data is jumped, and comprises the frequency table information of 32 bytes and the CRC check information of 1 byte; The structure that the frequency table data that main platform sends are jumped is identical with the feedback data jumping structure that sends from platform; Frequently after table issued the stage end, main platform entered receipts state on duty, withdraws from detection mode up to manual operation, carries out normal frequency hopping communications with new frequency table;
2., adopting main platform select frequency automatically decision-making, decision-making time is 1024 to jump; Main platform distribute 64 take turns survey jump synchronously after, as fail to receive feedback information from platform, through the fixing main platform decision-making time with after frequently showing transmitting time, continue to send 64 and take turns to survey synchronously and jump, until the feedback information of receiving from platform;
Perhaps adopt the frequency-selecting of manual type to make a strategic decision, enter detection mode transmission 64 and take turns the synchronous jumping of detection,, enter detection mode transmission 64 once more and take turns the synchronous jumping of detection, until the feedback information of receiving from platform if fail to receive from the platform feedback information.
2. the automatic frequency of realizing in the frequency hopping radio set network according to claim 1 is surveyed the method for networking, it is characterized in that: the institute in steps after, to add plurality of data at slow networking time slot and jump, make can cutting frequently with new frequency hopping table of slow networking from platform to transmit used frequency table information.
3. the automatic frequency of realizing in the frequency hopping radio set network according to claim 1 is surveyed the method for networking, it is characterized in that: the frequency-selecting decision-making in the described step (3) is manual type or automated manner frequency-selecting:
The manual type frequency-selecting: these ten tables are outputed to terminal, select frequency by main platform operator, as the frequency table of final selection, the decision-making time is unfixing;
The automated manner frequency-selecting: pick out main platform and each common factor from the best frequency subsets of channel quality between the platform automatically by the decision making algorithm of reserving in advance, as the frequency table of final selection, the decision-making time is fixed.
4. the automatic frequency of realizing in the frequency hopping radio set network according to claim 3 is surveyed the method for networking, it is characterized in that: the decision-making time of described automated manner frequency-selecting is set at 1024ms, final selecteed frequency table is stored with 32Byte=256Bit, and each bit represents whether the frequency of this sequence number is selected.
5. in the frequency hopping radio set network, realize the unit of automatic frequency detection networking, it is characterized in that: comprise main platform detection networking unit and survey the networking unit from platform, described main platform is surveyed the networking unit, all comprises mainboard, human-computer interaction module, digital module and channel module from platform detection networking unit that human-computer interaction module, digital module, channel module are connected with mainboard;
Digital module comprises interconnective master control submodule and digital signal processing sub module;
The master control submodule comprises interconnective kernel module, plate level support package module, and the control interface module that is connected with kernel module respectively, data interface module, channel access module, routing module, gateway module;
Mainboard, the passage of transfer of data between the module;
Human-computer interaction module, main control command, data and the voice service that receives from the outside, again it is mail to mainboard, also receive state information that mainboard reports simultaneously and the state information that is received is shown, receive speech that mainboard reports and data service and the outside is sent in the speech and the data service that are received;
Channel module mainly provides frequency down-conversion function, and intermediate-freuqncy signal and radiofrequency signal are changed mutually;
The digital signal processing sub module, controlled by the master control submodule, receive data and voice service that the master control submodule issues, handle the back and produce intermediate-freuqncy signal, and described intermediate-freuqncy signal is sent to radio station analog module, the intermediate-freuqncy signal that radio station analog module is brought is handled simultaneously, extract data and speech information, be sent to the master control submodule, the radio station digital signal processing module reports various state informations and radio station analog module is carried out corresponding control toward the master control submodule according to demand;
Kernel module as the interface between operating system and the hardware environment, has been finished the work of hardware initialization, and kernel module is supported operating system, self-defining public variable and function, for each software function module provides unified interaction platform;
Plate level support package module mainly is the support that realizes operating system, for the driver on upper strata provides the function bag of access hardware devices register, makes plate level support package module can better run on mainboard;
The control interface module receives the control command of human-computer interaction module, and reports the radio station state to human-computer interaction module;
Data interface module receives the data from human-computer interaction module, selects different transmit queues according to data type, and receives the data that other module need report, and is sent to human-computer interaction module and exports;
The channel access module, selection inserts the opportunity of radio station channel, avoids collision;
Routing module is realized the DSR Routing Protocol, realizes selection, maintenance and the renewal of route;
Gateway module is realized selection, maintenance and the renewal of gateway;
6. the automatic frequency of realizing in the frequency hopping radio set network according to claim 5 is surveyed the unit of networking, and it is characterized in that: described master control submodule comprises the ARM chip, the network interface control chip.
7. the automatic frequency of realizing in the frequency hopping radio set network according to claim 5 is surveyed the unit of networking, and it is characterized in that: described digital signal processing sub module comprises dsp chip TMS320C6416, fpga chip XC4VSX35, AD chip AD9862.
8. the automatic frequency of realizing in the frequency hopping radio set network according to claim 5 is surveyed the unit of networking, and it is characterized in that: described detection networking unit also comprises frequency compound module, DC power supplier, power amplifier module, the AC power supply module that is connected with mainboard;
Frequently compound module provides accurately stable frequency for digital baseband signal, intermediate-freuqncy signal and channel are synthetic;
DC power supplier is converted into the direct voltage that other modules need with fixing direct voltage;
Power amplifier module, the signal power that channel module is provided is amplified to the user grade is set, and the interface that is connected with antenna is provided;
AC power supply module is converted into direct voltage with AC supply voltage, uses for DC power supplier.
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| CN114337894A (en) * | 2021-12-30 | 2022-04-12 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Frequency hopping communication method and system |
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| WO2024092507A1 (en) * | 2022-10-31 | 2024-05-10 | 厦门华数电力科技有限公司 | Low-interference wireless communication method and apparatus, computer-readable medium, and device |
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| CN114362789A (en) * | 2022-03-21 | 2022-04-15 | 北京理工大学 | Frequency hopping communication method, device, system, equipment and storage medium |
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