CN113452409B - Frequency hopping implementation method of asynchronous ad hoc network - Google Patents
Frequency hopping implementation method of asynchronous ad hoc network Download PDFInfo
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Abstract
The application discloses a frequency hopping realization method of an asynchronous ad hoc network, which comprises the steps of switching local oscillator frequency according to a preset frequency segment; acquiring sampling data of a current local oscillation frequency; mixing the sampling data to each preset carrier frequency in the local oscillation frequency; calculating the energy of the sampled data after frequency mixing to obtain energy data; sequentially comparing each energy data with a preset threshold; if the current energy data is smaller than the preset threshold, returning to the initial step; if the current energy data is larger than a preset threshold, maintaining the local oscillation frequency corresponding to the carrier frequency; acquiring subsequent sampling data of the carrier frequency as a communication frame; demodulating the communication frame to obtain communication content; wherein the sampled data includes a frequency synchronization field transmitted concurrently with the communication frame. The frequency hopping implementation method solves the problems that the stability of a frequency hopping network is reduced due to poor and unstable time slot synchronization precision of the existing scheme, and the anti-interference capability or the anti-interception capability is poor due to carrying of service frames or signaling frames.
Description
Technical Field
The present application relates to the field of network transmission technologies, and in particular, to a frequency hopping implementation method for an asynchronous ad hoc network.
Background
The self-organizing network is mainly characterized by no center, self-organizing, multi-hop routing and dynamic topology, the whole network does not depend on any infrastructure, nodes in the network have double roles, and the nodes are not only common mobile terminals, but also have the functions of relay routers. When the source node and the destination node of communication can not communicate directly, the message can be forwarded through the intermediate node, and the function of multi-hop wireless communication is realized. Therefore, the method has the advantages of rapid network deployment, strong survivability, flexible networking and the like, and the self-organizing network becomes one of important communication means for tasks such as battle, emergency, rescue and the like.
The frequency hopping means that carrier frequencies at two ends of transceiving communication synchronously change along with a preset frequency sequence, so that the anti-interference capability of communication is improved, and the probability of illegal interception of communication information is reduced.
The premise of realizing frequency synchronization of the traditional frequency hopping ad hoc network is that the whole network node completes strict time slot synchronization, and the whole network synchronization of the ad hoc network has larger error due to the uncertainty of wireless communication, especially under the condition of multi-hop network topology, the time slot synchronization precision is more difficult to guarantee, and the frequency synchronization is established on the basis of the time slot synchronization, so that the instability of the time slot synchronization can also cause the instability of the frequency synchronization of the whole network node, and the stability of the frequency hopping network is reduced; in addition, in the case of network interference, if the service frame for timeslot synchronization is attacked, some nodes of the network may fail to synchronize, and in severe cases, the network may even burst, so that the existence of timeslot synchronization signaling impairs the anti-interference capability of the frequency hopping network. Finally, in order to realize the time slot synchronization of the whole network, the nodes in the network need to periodically send signaling frames for time slot synchronization even if no service to be sent exists, and an eavesdropper can obtain the sending frequency information of the nodes at any time, so that convenience is provided for the eavesdropper to crack the law of frequency hopping and intercept communication contents, and the interception resistance of the frequency hopping network is reduced.
Therefore, designing a frequency hopping implementation method of an asynchronous ad hoc network, which can improve stability and anti-interference effect and improve anti-interception capability, is a problem to be solved by technical personnel in the field.
Disclosure of Invention
In order to solve the technical problems, the application provides a frequency hopping implementation method of an asynchronous ad hoc network, which solves the problems that in the existing scheme, the time slot synchronization precision is difficult to guarantee, the instability of the time slot synchronization causes the instability of the frequency synchronization of nodes in the whole network, the stability of a frequency hopping network is reduced, and the anti-interference capability is poor due to the fact that the time slot synchronization needs to carry service frames or the anti-interception capability is poor due to the fact that the time slot synchronization needs to carry signaling frames.
The technical scheme provided by the application is as follows:
a frequency hopping realization method of an asynchronous ad hoc network comprises the following steps:
switching local oscillation frequency according to a preset frequency band;
acquiring sampling data of the current local oscillation frequency;
mixing the sampling data to each preset carrier frequency in the local oscillation frequency;
calculating the energy of the sampled data after frequency mixing to obtain energy data;
comparing each energy data with a preset threshold in sequence;
if the current energy data is smaller than the preset threshold, returning to the initial step;
if the current energy data is larger than the preset threshold, keeping the local oscillation frequency corresponding to the carrier frequency;
acquiring subsequent sampling data of the carrier frequency as a communication frame;
demodulating the communication frame to obtain communication content;
wherein the sampled data includes a frequency synchronization field transmitted simultaneously with the communication frame.
Preferably, before the switching the local oscillation frequency according to the preset frequency band, the method further includes:
initializing the frequency synchronization field;
wherein the frequency synchronization field is bound with the communication frame and is disposed at a front portion of the communication frame.
Preferably, the frequency synchronization field is generated after M-sequence modulation and filtering, and the length thereof is formed according to the frequency conversion time, the fast synchronization time and the total number of frequency conversion of the frequency hopping receiving end.
Preferably, before the switching the local oscillation frequency according to the preset frequency band, the method further includes:
decomposing the frequency hopping working bandwidth into i frequency segments as the preset frequency segments;
wherein, each frequency band has the same bandwidth, and the center frequency is denoted as Fi.
Preferably, after the dividing the frequency hopping operating bandwidth into i frequency segments as the preset frequency segment, the method further includes:
setting Fi to j carrier frequencies according to the working bandwidth of a communication frame;
wherein the carrier frequency is denoted fij.
Preferably, after the local oscillation frequency is switched according to the preset frequency band, the method further includes:
judging whether the local oscillation frequency is stable;
if the stability is stable, entering the next step;
if the data is not stable, the judgment is carried out again.
Preferably, after the initializing the frequency synchronization field, the method further includes:
switching to the carrier frequency;
transmitting the frequency synchronization field and the communication frame.
Preferably, before transmitting the frequency synchronization field and the communication frame, the method further includes:
judging whether the carrier frequency is stable;
if the stability is stable, entering the next step;
if the temperature is not stable, returning to the previous step.
Preferably, the energy data obtained by calculating the energy of the mixed sampling data specifically includes:
filtering the sampled data after frequency mixing;
and calculating the energy of the filtered sampling data to obtain the energy data.
Preferably, the obtaining of the sampling data of the current local oscillator frequency specifically includes:
staying for a preset time at the current local oscillation frequency;
and collecting the sampling data of the current local oscillation frequency in the preset time.
The frequency hopping realization method of the asynchronous ad hoc network is provided with a frequency synchronization field, the frequency synchronization field which is simultaneously transmitted along with the communication frame is added with sampling data, when the local oscillation frequency is switched, the sampling data containing the frequency synchronization field is mixed to each preset carrier frequency in the local oscillation frequency, the energy data after frequency mixing is calculated, the energy data is compared with a preset threshold, if the energy data is greater than the preset threshold, the local oscillation frequency corresponding to the carrier frequency is kept, and the subsequent sampling data are demodulated.
The frequency synchronization field for frequency synchronization is sent before each node communication, so that time slot synchronization is not needed to be realized for all nodes in the network, and the problems that in the existing scheme, the time slot synchronization precision is difficult to guarantee, the frequency synchronization of the nodes in the whole network is unstable due to instability of the time slot synchronization, the stability of a frequency hopping network is reduced, and the anti-interference capability is poor due to the fact that the time slot synchronization needs to carry service frames or the anti-interception capability is poor due to the fact that the time slot synchronization needs to carry signaling frames are solved.
Meanwhile, the frequency synchronization field is directly added into the communication frame structure, and the communication frame structure is not associated with the modulation coding of the physical layer for subsequent communication, so that the communication frame structure can be combined with any physical layer, and the realization is simple. And the whole frequency hopping working frequency band is segmented, and the carrier frequency of the communication frame is identified through mixed frequency, so that the frequency of local oscillator switching is reduced, the length of a frequency synchronization field in a frame structure of the communication frame is reduced, and the throughput loss caused by adding a frequency hopping function is reduced to the minimum.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a frequency hopping implementation method according to an embodiment of the present invention;
fig. 2 is another schematic flowchart of a frequency hopping implementation method according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of step S104 in the frequency hopping implementation method according to the embodiment of the present invention;
fig. 4 is a flowchart illustrating step S102 in the frequency hopping implementation method according to the embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure to be understood and read by those skilled in the art, and are not used for limiting the practical limitations of the present disclosure, so they do not have the essential technical meaning, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical disclosure of the present disclosure without affecting the function and the achievable purpose of the present disclosure.
Embodiments of the present invention are written in a progressive manner.
The embodiment discloses a frequency hopping implementation method of an asynchronous ad hoc network, as shown in fig. 1, including the following steps:
s101, switching local oscillation frequency according to a preset frequency band;
s102, acquiring sampling data of a current local oscillation frequency;
s103, mixing the sampling data to each preset carrier frequency in the local oscillation frequency;
s104, calculating the energy of the sampled data after frequency mixing to obtain energy data;
s105, comparing each energy data with a preset threshold in sequence;
s106, if the current energy data are smaller than a preset threshold, returning to the initial step;
s107, if the current energy data are larger than a preset threshold, maintaining a local oscillation frequency corresponding to the carrier frequency;
s108, acquiring subsequent sampling data of the carrier frequency as a communication frame;
s109, demodulating the communication frame to obtain communication content;
wherein the sampled data includes a frequency synchronization field transmitted concurrently with the communication frame.
The traditional frequency hopping ad hoc network adopts a TDMA MAC protocol, a time domain channel is firstly cut according to a fixed time length, each fixed time length is called a time slot, nodes in the network can only access the channel according to the time slot, and in order to ensure that each node can access the channel orderly, a mechanism is needed to realize the strict synchronization of the time slots of nodes in the whole network, namely the starting points of the time slots of the nodes in the whole network are all strictly aligned and synchronized; therefore, the time slots are divided into two types, namely a synchronous time slot which is used for the nodes to send service frames so as to realize the time slot synchronization among the nodes; the other is a data time slot used for service transmission; when frequency hopping is added, time slot synchronization among nodes is realized, frequency hopping frequency synchronization is further required to be realized, classical frequency synchronization adopts a fixed receiving frequency waiting mode, namely, a newly-accessed node adopts a certain fixed frequency to wait for receiving in a synchronization time slot, after a service frame is received, frequency synchronization is completed, time slot synchronization is completed by utilizing time information in the service frame, then frequency switching is completed before each time slot starts according to a pre-determined frequency sequence, so that the receiving and transmitting frequencies of the nodes in the whole network are the same in each time slot, and uniform hopping is performed according to the time slot length according to the frequency sequence pre-determined by the time slot.
The frequency hopping sending frame of the embodiment of the invention adds a frequency synchronization field for frequency synchronization relative to a fixed frequency sending frame, the frequency synchronization field is directly stored in an RAM memory, and a frequency hopping sending end reads and sends the frequency synchronization field in sequence each time. That is, a synchronization field for frequency synchronization is added in front of a communication frame of each node, and when transmitting, a transmitting end node selects a frequency for this transmission according to a frequency hopping pattern, switches a carrier frequency of a transmitter to a transmitting frequency, then transmits the frequency synchronization field, and finally transmits modulated data to be transmitted.
And the receiving end node executes step S101, namely, switches the local oscillator frequency between preset frequency segments, enters step S102 to receive and acquire the sampled data after switching, then executes step S013, namely, mixes the sampled data to each preset carrier frequency in the local oscillator frequency, then executes energy detection, enters step S104 to calculate the energy of the mixed sampled data to obtain energy data, executes step S105 by combining with a preset threshold, namely, compares each energy data with the preset threshold in sequence, and then, according to the comparison result, there are two cases.
If the current energy data is smaller than the preset threshold, the first mode is S106, if the receiving and sending frequency synchronization is not finished, the step S101 is returned to, and the loop is switched to another local oscillation frequency to continue circulation; secondly, if the current energy data is greater than the preset threshold, which means that the transceiving frequency synchronization is completed, S107, the local oscillation frequency corresponding to the carrier frequency is maintained until the subsequent communication is completed, and step S108 is performed, i.e., the subsequent sampling data of the carrier frequency is obtained as the communication frame, and then the communication frame is demodulated through step S109 to obtain the communication content. It should be noted that after the carrier frequency is confirmed and the local oscillation frequency corresponding to the carrier frequency is maintained, the received subsequent sampling data directly corresponds to the transmission data, and thus the communication content is finally obtained through demodulation. And after the communication is finished, continuously and circularly switching the local oscillation frequency of the radio frequency channel according to the preset frequency section to carry out frequency synchronization.
It should be noted that there are many implementations of frequency synchronization or frequency acquisition, which are not intended to be the scope of the present invention, and the specific implementation can be determined by the ratio coefficient of the autocorrelation and cross-correlation function, for example, the received sample sequence is R (k),
if it is
And then, frequency synchronization is realized, wherein L is the length of the M sequence, a is a preset threshold coefficient, the transmitting end is supposed to repeatedly transmit two sections of M sequences with the length of L at a certain carrier frequency, after the receiving end switches and receives the sampling data of the carrier frequency, the cross-correlation function value of the sampling data is calculated according to the numerator, the auto-correlation function value of the sampling data is calculated according to the denominator, and then judgment is carried out.
The autocorrelation and the cross-correlation respectively represent the degree of correlation between two time sequences and between values of the same time sequence at any two different moments, that is, the cross-correlation function describes the degree of correlation between values of the random signal x (t) and values of the y (t) at any two different moments t1 and t2, and the autocorrelation function describes the degree of correlation between values of the random signal x (t) at any two different moments t1 and t 2.
According to the frequency hopping implementation method of the asynchronous ad hoc network, the frequency synchronization field used for frequency synchronization is sent before each node communication, time slot synchronization does not need to be achieved for all nodes in the network, the problem that in the existing scheme, the time slot synchronization precision is difficult to guarantee, the instability of the time slot synchronization causes the instability of the frequency synchronization of the nodes in the whole network, the stability of the frequency hopping network is reduced, and the problem that the anti-interference capability is poor due to the fact that the time slot synchronization needs to carry service frames or the anti-interception capability is poor due to the fact that the time slot synchronization needs to carry signaling frames is solved.
Meanwhile, the frequency synchronization field is directly added into the communication frame structure, and the communication frame structure is not associated with the physical layer modulation code for subsequent communication, so that the communication frame structure can be combined with any physical layer, and the realization is simple. And the whole frequency hopping working frequency band is segmented, and the carrier frequency of the communication frame is identified through mixed frequency, so that the frequency of local oscillator switching is reduced, the length of a frequency synchronization field in a frame structure of the communication frame is reduced, and the throughput loss caused by adding a frequency hopping function is reduced to the minimum.
The frequency hopping method provided by the embodiment of the invention does not need to realize the whole network synchronization, can adapt to MAC protocols of burst access such as CSMA/CA, token and the like, each node in the network is independent, and the network cannot easily run due to the ordered shared channel according to the MAC protocol of burst access, and the anti-interference performance is strong; secondly, based on the frequency hopping method of the asynchronous network, the node does not need to periodically broadcast a signaling frame for synchronization, when no data to be sent exists, the node can keep silent for a long time, an eavesdropper cannot obtain the frequency information to be sent, and enough information cannot be accumulated to decipher the rule of the sending frequency, so that the anti-interception performance of the frequency hopping network is guaranteed against loss.
Preferably, as shown in fig. 2, before the step S101, that is, switching the local oscillation frequency according to the preset frequency band, the method further includes:
s201, initializing a frequency synchronization field;
wherein, the frequency synchronization field is bound with the communication frame and is arranged at the front part of the communication frame.
There are many detailed methods for initialization, and the specific methods adopted in this embodiment are: the length L of the M sequences is 2 × N > (frequency conversion time + dwell time + fast synchronization time) is 1.1 times of the total number of the frequency conversion, wherein 2 × N represents the number of the M sequences needing to be sent, and the minimum integer meeting the condition is taken; the dwell time is greater than the transmission time length of the two M-sequences.
The frequency synchronization field after initialization is directly stored in the RAM, and is read and sent in sequence every time, so that temporary generation is avoided when the frequency synchronization field needs to be sent, and subsequent sending requirements can be met only by carrying out initialization once, and further the operation efficiency is improved.
Preferably, the frequency synchronization field is generated after M-sequence modulation and filtering, and the length thereof is formed according to the frequency change time, the fast synchronization time and the total number of frequency changes of the frequency hopping receiving end.
The M sequence is a pseudo-random sequence, the M sequences with the length L of 2 × N are repeatedly transmitted, and a receiving end can be guaranteed to always receive the two repeated M sequences, so that the receiving end can be guaranteed to have enough received signal length to complete frequency synchronization before each communication, and data acquisition omission or communication establishment failure caused by missing can be avoided.
Preferably, as shown in fig. 2, before the step S101, that is, switching the local oscillation frequency according to the preset frequency segment, the method further includes:
s301, decomposing the frequency hopping working bandwidth into i frequency segments serving as preset frequency segments;
wherein each frequency bin has the same bandwidth, and its center frequency is denoted Fi.
The frequency hopping receiving end decomposes the whole frequency hopping operating bandwidth, for example, the frequency hopping operating bandwidth is 200MHz, and decomposes the frequency hopping operating bandwidth into 5 frequency segments, each frequency segment has a bandwidth of 40M, and its central frequency is defined as Fi (i =1,2,3,4, 5), i.e., F1, F2, F3, F4 and F5, which is intended to reduce the frequency switching times of the receiving end and support more frequency hopping frequencies with the minimum frequency switching times.
Preferably, as shown in fig. 2, after the step S301 of dividing the frequency hopping operating bandwidth into i frequency segments as the preset frequency segments, the method further includes:
s302, setting Fi into j carrier frequencies according to the working bandwidth of a communication frame;
where the carrier frequency is denoted fij.
Setting the transmission frequency of the communication frame in each frequency hopping segment according to the operating bandwidth of the communication frame, for example, designing the operating bandwidths of 4 communication frames in a bandwidth with a center frequency F1, where the carrier center frequency is fij (i =1,2,3,4,5 j =1,2,3, 4), i represents the frequency segment where the frequency is located, and j represents the carrier frequency for transmitting the communication frame in the i frequency segment. Assuming that the bandwidth occupied by the communication frame is 5MHz, fi1= Fi-10MHz, fi2= Fi-5MHz, fi3= Fi +5MHz, and Fi4= Fi +10MHz are designed, 20 frequencies are supported to be used for transmitting the communication frame in the 200MHz frequency hopping bandwidth.
Preferably, after the step S101, that is, the local oscillation frequency is switched according to the preset frequency band, the method further includes:
s401, judging whether the local oscillation frequency is stable;
s402, if the stability is ensured, the next step is carried out;
and S403, if the data are not stable, judging again.
In practical application, a simpler way is to obtain the maximum time from frequency conversion to stabilization of batch equipment through experiments, then increase a certain margin, and after frequency conversion, wait for the maximum time plus the margin and then transmit and receive data.
Preferably, in order to ensure that the frequency synchronization field can be used as a basis for frequency synchronization, as shown in fig. 2, after the step S201, that is, initializing the frequency synchronization field, the method further includes:
s202, switching to a carrier frequency;
and S203, sending a frequency synchronization field and a communication frame.
Preferably, before the step S203 of transmitting the frequency synchronization field and the communication frame, the method further includes:
s501, judging whether the carrier frequency is stable;
s502, if the stability is stable, entering the next step;
and S503, if the temperature is not stable, returning to the previous step.
Similar to the above, in practical application, a simpler way is to obtain the maximum time from frequency conversion to stability of batch equipment through experiments, then add a certain margin, and after frequency conversion, wait for the maximum time plus the margin and then transmit and receive data.
Preferably, as shown in fig. 3, the step S104 of calculating the energy of the mixed sampling data to obtain energy data specifically includes:
s601, filtering the sampled data after frequency mixing;
and S602, calculating the energy of the filtered sampling data to obtain energy data.
In practical use, generally, the sampled data is input into a mixer for frequency mixing, then input into a low-pass filter for filtering, and finally the filtered sampled data is calculated for its capability to obtain energy data, wherein the low-pass filter is an electronic filtering device that allows signals below a cutoff frequency to pass through but prevents signals above the cutoff frequency from passing through, so as to avoid interference of some useless signals or interference signals in the data after frequency mixing on energy calculation.
Preferably, as shown in fig. 4, the step S102 of acquiring the sampling data of the current local oscillation frequency specifically includes:
s701, residing in preset time at the current local oscillation frequency;
s702, sampling data of the current local oscillation frequency in preset time is collected.
The receiving end is ensured to have enough received signal length to complete frequency synchronization before each communication by residing for a preset time with a certain length at the current local oscillation frequency, and two complete M sequences can be received.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the modules is only one logical functional division, and other division manners may be implemented in practice, for example: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or modules may be electrical, mechanical or other.
In addition, all functional modules in the embodiments of the present invention may be integrated into one processor, or each module may be separately used as one device, or two or more modules may be integrated into one device; each functional module in each embodiment of the present invention may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by program instructions and related hardware, where the program instructions may be stored in a computer-readable storage medium, and when executed, the program instructions perform the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A frequency hopping realization method of an asynchronous ad hoc network is characterized by comprising the following steps:
switching local oscillation frequency according to a preset frequency band;
acquiring sampling data of the current local oscillation frequency;
mixing the sampling data to each preset carrier frequency in the local oscillation frequency;
calculating the energy of the sampled data after frequency mixing to obtain energy data;
comparing each energy data with a preset threshold in sequence;
if the current energy data is smaller than the preset threshold, returning to the initial step;
if the current energy data is larger than the preset threshold, keeping the local oscillator frequency corresponding to the carrier frequency;
acquiring subsequent sampling data of the carrier frequency as a communication frame;
demodulating the communication frame to obtain communication content;
wherein the sampled data includes a frequency synchronization field transmitted concurrently with the communication frame;
before switching the local oscillation frequency according to the preset frequency band, the method further comprises the following steps:
initializing the frequency synchronization field;
wherein the frequency synchronization field is bound with the communication frame and is disposed at a front portion of the communication frame;
the frequency synchronization field is generated after M sequence modulation and filtering, and the length of the frequency synchronization field is formed according to the frequency conversion time, the fast synchronization time and the total frequency conversion quantity of the frequency hopping receiving end.
2. The method according to claim 1, wherein before the switching the local oscillation frequency according to the preset frequency band, the method further comprises:
decomposing the frequency hopping working bandwidth into i frequency segments as the preset frequency segments;
wherein each of the frequency bins has the same bandwidth, and the center frequency thereof is denoted as Fi.
3. The method according to claim 2, further comprising, after said dividing the frequency hopping operating bandwidth into i frequency segments as the preset frequency segments:
according to the working bandwidth of the communication frame, F i Setting to j of said carrier frequencies;
wherein the carrier frequency is denoted as f ij 。
4. The method for implementing frequency hopping according to claim 1, further comprising, after the switching the local oscillation frequency according to the preset frequency band:
judging whether the local oscillator frequency is stable;
if the stability is stable, entering the next step;
if the current time is not stable, the judgment is carried out again.
5. The method of claim 1, further comprising, after the initializing the frequency synchronization field:
switching to the carrier frequency;
transmitting the frequency synchronization field and the communication frame.
6. The method of claim 5, further comprising, before transmitting the frequency synchronization field and the communication frame:
judging whether the carrier frequency is stable;
if the stability is stable, entering the next step;
and if the temperature is not stable, returning to the previous step.
7. The method according to claim 1, wherein the calculating energy of the mixed sampled data to obtain energy data specifically comprises:
filtering the sampled data after frequency mixing;
and calculating the energy of the filtered sampling data to obtain the energy data.
8. The method according to claim 1, wherein the obtaining of the sampling data of the current local oscillator frequency specifically includes:
staying for a preset time at the current local oscillation frequency;
and acquiring the sampling data of the current local oscillation frequency in the preset time.
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| CN104579417A (en) * | 2013-10-23 | 2015-04-29 | 北京海格神舟通信科技有限公司 | Multistage synchronization method for broadband frequency-hopping wireless communication network |
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| CN107070498B (en) * | 2017-04-17 | 2019-01-25 | 中国电子科技集团公司第五十四研究所 | A kind of sub-clustering multistage ad hoc network method for synchronizing time based on frequency hopping TDMA system |
| EP3429306B1 (en) * | 2017-07-14 | 2020-08-26 | HTC Corporation | Frequency hopping communication recovering method, electronic device, and non-transitory computer readable storage medium |
| CN109194366B (en) * | 2018-08-30 | 2020-12-29 | 杭州波拓科技有限公司 | Wireless ad hoc network frequency hopping radio station based on G3-PLC chip and radio frequency module |
| CN110248320B (en) * | 2019-06-13 | 2021-03-23 | 无锡士康通讯技术有限公司 | Wireless self-organizing network management method based on time synchronization and frequency synchronization |
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