CN113098561B - Frequency hopping modulation method, device and system based on frequency point index of frequency hopping pattern - Google Patents
Frequency hopping modulation method, device and system based on frequency point index of frequency hopping pattern Download PDFInfo
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- CN113098561B CN113098561B CN202110362686.9A CN202110362686A CN113098561B CN 113098561 B CN113098561 B CN 113098561B CN 202110362686 A CN202110362686 A CN 202110362686A CN 113098561 B CN113098561 B CN 113098561B
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Abstract
The application relates to a frequency hopping modulation method, a device and a system based on frequency hopping pattern frequency point index. The method comprises the following steps: and coding each frequency hopping pattern frequency point in one frequency hopping period to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point, activating the corresponding frequency hopping pattern frequency point in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency point. And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points. The method and the device aim at the characteristic that the reactive interference only aims at the currently active frequency point to implement interference, so that the reactive symbol-level interference cannot suppress interference communication signals through energy, and are helpful for distinguishing an activated channel from other silent channels, and the bit error rate in the communication transmission process is reduced.
Description
Technical Field
The present invention relates to the field of frequency hopping communications technologies, and in particular, to a frequency hopping modulation method, device, and system based on frequency point index of a frequency hopping pattern.
Background
Due to the openness of the wireless channel, a malicious sender can easily detect the frequency band used by a legal communication party, estimate communication parameters and further implement interference. Frequency hopping communication is a common anti-interference means, and legal transceivers and receivers utilize known frequency hopping patterns to enable the working frequency points of signals to change continuously so as to avoid the influence of interference signals. Because the interference party can not obtain the position of the working frequency point predicted by the frequency hopping pattern, when the hopping speed is fast enough, the interference party can hardly track the interference, so that the frequency hopping communication can have stronger anti-interference capability. However, when an excessively fast hopping rate is adopted to avoid tracking interference, the transmission rate of frequency hopping communication is low because of large signal damage of frequency hopping communication.
In recent years, a reactive interference scheme has appeared for frequency hopping communication. Reactive interference is a relatively intelligent and low power consumption interference that is only directed to the process of receiving packets. Since the Packet handover Ratio (PDR) cannot be accurately determined in practical applications, it is very difficult to detect the reactive interference. Furthermore, there are studies that suggest detecting the presence of reactive interference based on whether PDR is below a threshold by comparing a prior empirical PDR with a current estimated PDR, and in this way detecting and countering reactive interference is still difficult to achieve due to the complexity of the actual channel conditions.
Disclosure of Invention
In view of the above, it is necessary to provide a frequency hopping modulation method, device and system based on frequency point index of frequency hopping pattern, which can combat reactive interference.
A frequency hopping modulation method based on frequency point index of a frequency hopping pattern comprises the following steps:
and coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point.
And activating the corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
In one embodiment, the index communication transmission data includes a transmission mode identification bit. The method further comprises the following steps:
and when the value of the transmission mode identification bit corresponds to the high-frequency spectrum utilization rate mode, demodulating the index communication transmission data to obtain modulation communication transmission data.
In one embodiment, the manner of obtaining the frequency points of the frequency hopping pattern activated in each frequency hopping period in the communication signal includes:
and respectively using an energy maximum likelihood detector in each frequency hopping period, comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
In one embodiment, the generation manner of the frequency points of the frequency hopping pattern includes:
frequency hopping pattern frequency points of each frequency hopping period are generated based on the pseudo random codes.
In one embodiment, the generation manner of the frequency points of the frequency hopping pattern includes:
and generating the frequency hopping pattern frequency points of each frequency hopping period through nonlinear change based on the real-time value and a preset initial key.
A frequency hopping modulation device based on frequency point index of a frequency hopping pattern comprises:
and the frequency hopping pattern coding module is used for coding each frequency hopping pattern in one frequency hopping period according to a preset coding rule to obtain the frequency hopping pattern coded data of each frequency hopping pattern.
And the communication data coding module is used for activating the corresponding frequency hopping patterns in each frequency hopping period, and the index communication transmission data to be transmitted are formed by the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns.
And the communication data recovery module is used for obtaining corresponding index communication transmission data according to the activated frequency hopping patterns in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns.
A frequency hopping modulation system based on frequency point index of frequency hopping patterns comprises a sending end and a receiving end.
The sending end comprises an index mapping unit and is used for coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point, activating the corresponding frequency hopping pattern frequency point in each frequency hopping period, and forming index communication transmission data to be sent by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency point.
The receiving end comprises an index demapping unit, and the index demapping unit is used for obtaining corresponding index communication transmission data according to the frequency hopping pattern frequency points activated in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
In one embodiment, the transmitting end further includes a bit divider configured to divide data to be transmitted into index communication transmission data and modulation communication transmission data.
And the receiving end acquires a transmission mode identification bit in the index communication transmission data, and demodulates the index communication transmission data when the value of the transmission mode identification bit corresponds to the high-frequency spectrum utilization rate mode to obtain modulation communication transmission data.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
and coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point.
And activating the corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
and coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point.
And activating the corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
Compared with the prior art, the frequency hopping modulation method, the frequency hopping modulation device, the frequency hopping modulation system, the computer equipment and the storage medium based on the frequency hopping pattern frequency point index encode each frequency hopping pattern frequency point in one frequency hopping period to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point, activate the corresponding frequency hopping pattern frequency point in each frequency hopping period, and form index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency point. And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points. The method is characterized in that reactive interference is only used for implementing interference on currently active frequency points, a frequency hopping modulation method for transmitting information through activated frequency hopping pattern frequency bands in frequency hopping patterns is designed, and reactive symbol-level interference cannot suppress interference through energy to a communication signal of the frequency hopping modulation method provided by the application; on the contrary, when the energy of the reactive symbol-level interference is too large, the frequency hopping modulation method provided by the application can enhance the channel energy of the activated frequency hopping pattern frequency point due to the interference signal, thereby being more beneficial to distinguishing the activated channel from other silent channels and reducing the bit error rate in the communication transmission process.
Drawings
FIG. 1 is a schematic diagram illustrating a frequency hopping modulation system based on frequency point index of a frequency hopping pattern according to an embodiment;
FIG. 2 is a diagram illustrating steps of a frequency hopping modulation method based on frequency point indices of a frequency hopping pattern according to an embodiment;
fig. 3 is a schematic diagram of a frequency hopping pattern when N is 4 in one embodiment;
FIG. 4 is a schematic view of a communication system model for simulation analysis;
FIG. 5 is a schematic diagram illustrating the effect of reactive interference on a frequency hopping modulation scheme based on frequency point index of a frequency hopping pattern;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method designs a frequency hopping modulation method based on frequency hopping pattern frequency point index by using the characteristic that reactive interference only implements interference aiming at the current active frequency point, and the silent frequency point is completely the same as the state of other frequency points which are not utilized and cannot interfere with the silent frequency point, and transmits information by using the index positions of the active frequency point and the silent frequency point so as to achieve the purpose of resisting reactive symbol-level interference. Because the silent frequency point is hidden in the whole frequency band, the key of anti-interference is the anti-interference design of the active frequency point.
In one embodiment, as shown in fig. 1, a frequency hopping modulation system based on frequency point index of a frequency hopping pattern is provided, which includes a transmitting end and a receiving end. Taking an example that a frequency hopping modulation method based on frequency point indexes of a frequency hopping pattern is applied to the system shown in fig. 1, as shown in fig. 2, the method includes the following steps:
step 202, encoding each frequency hopping pattern frequency point in a frequency hopping period according to a preset encoding rule to obtain frequency hopping pattern encoded data of each frequency hopping pattern frequency point.
Specifically, the purpose of step 202 is to obtain the encoding rule of the index mapping module of the transmitting end to the data to be transmitted and the decoding rule of the index de-mapping module of the receiving end to the received data, so that the entire communication system obtains a uniform encoding and decoding rule. The frequency hopping pattern frequency points of each frequency hopping period can be generated based on pseudo random codes, and also can be generated through nonlinear change based on real-time values and preset initial keys. The coding rule adopted by the application is as follows: in each frequency hopping period, all available K frequency hopping pattern frequency points f in the channel of the slave system 1 ,...,f K Selecting N mutually orthogonal hopsAnd the frequency pattern frequency points are coded. In the present embodiment, N is an integer power of 2 and N is not greater than K, according to the encoding method adopted in the present embodiment. As shown in fig. 3, when N is 4, T is 1 ,...,T B In each of the B hopping periods, 4 orthogonal hopping pattern frequency points, i.e., FH-pattern 1, FH-pattern 2, FH-pattern 3, and FH-pattern 4, are respectively selected, and the mapping rules of the index mapping unit and the index demapping unit are obtained by encoding the 4 hopping pattern frequency points, as shown in table 1.
Table 1 mapping rule when N is 4
| Index bits | Frequency hopping |
| 00 | |
| 01 | |
| 10 | |
| 11 | Pattern 4 |
And 204, activating corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
When a sending end sends information, according to data to be sent, a corresponding frequency hopping pattern frequency point is activated in each frequency hopping period, and different frequency hopping pattern frequency points are activated in a plurality of continuous frequency hopping periods, so that the purpose of converting the data to be sent into communication signals is achieved. And transmitting the frequency point of the frequency hopping pattern activated by the sending end in the current frequency hopping period to the frequency synthesizer so as to control the output frequency of the frequency synthesizer.
And step 206, the receiving end obtains corresponding index communication transmission data according to the activated frequency hopping pattern frequency point in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency point.
The receiving end performs demapping by the local index demapping unit according to the mapping manner shown in table 1 to obtain corresponding bit data, and recovers the data content that the transmitting end wants to transmit.
Further, the transmitting end further includes a bit divider for dividing data to be transmitted into index communication transmission data and modulation communication transmission data.
The index communication data refers to data transmitted by the method described in step 202 to step 204. The activated frequency hopping pattern frequency point does not carry data content to be sent, and the signal has stronger anti-interference performance and is in an anti-interference mode (AJ mode). At this time, the BPSK signal or QPSK signal subjected to the random bit intermediate frequency modulation generated by the random bit generator may be loaded on the activated frequency hopping pattern bin. When the two parties are in an interference-free communication environment, the data content to be sent can be carried in the activated frequency hopping pattern frequency point, so that the utilization rate of the frequency spectrum is improved, and the equipment enters a high-frequency spectrum utilization rate mode (SE mode).
At this time, the sending end uses a bit divider to divide m-bits data to be sent into m 1 Index communication transmission data of bits and m 2 The modulation of bits communicates the transmitted data. M is to be 1 The index communication transmission data of the bits is subjected to frequency hopping modulation based on the frequency point index of the frequency hopping pattern based on the steps 202 to 204, and m is obtained 2 And transmitting the modulation communication transmission data of the bits through modulating the activated frequency hopping pattern frequency point. At this time, mode switching can be realized by setting devices at both transmitting and receiving ends, or in-process mode switching can be realizedAnd a transmission mode identification bit is added in the input bits. For example, when the receiving end recognizes that the value of the transmission mode flag is 1, it indicates that the sending end employs the high spectrum utilization rate mode, and at this time, the receiving end demodulates the index communication transmission data obtained after demapping to obtain the modulation communication transmission data. In addition, when the receiving end recognizes the value of the transmission mode identification bit, the value can be further used for distinguishing the modulation mode on the activated frequency hopping point.
In one embodiment, the manner for the receiving end to obtain the activated frequency hopping pattern frequency points in each frequency hopping period in the communication signal includes:
and respectively using an energy maximum likelihood detector in each frequency hopping period, comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
Specifically, the receiving side obtains N different output frequencies for N frequency points controlled by N hopping pattern frequency points through the frequency synthesizer. And combining the received signals into N paths, multiplying the N paths of signals by the N output frequencies respectively, and obtaining the signals on the N output frequencies through an ideal band-pass filter. Assuming that there is a modulation signal at the kth frequency point, after passing through a gaussian white noise channel, the received signal can be represented as:
where E represents the signal energy.
Is the phase controlled by m2-bits or random bit modulation.
And n (t) represents the initial phase and additive white gaussian noise on the channel. After down-conversion and synchronization, the obtained signals are:
wherein, for the signals received on the silent frequency point, the following are:
thereafter, N received signals on legitimate channels are compared using an energy maximum likelihood detector
The frequency point with the maximum energy is regarded as the activated frequency point, namely:
where | represents an absolute value operation. After the energy maximum likelihood detection, the estimated index position of the activated frequency point is input into an index inverse mapper, and the index position is transmitted into an index demapper to obtain index communication transmission data.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical effect of the frequency hopping modulation method based on the frequency point index of the frequency hopping pattern provided by the application is described through simulation experiments. Fig. 4 shows a communication system model, where a is a legitimate transmitter, B is a legitimate receiver, and J is an interferer. A modulates the bit stream to be transmitted and then sends the modulated bit stream to a wireless channel. In the legitimate link between a and B, the legitimate receiver B receives signals from both the legitimate link and the interfering link. The interferer J uses the received information to analyze its modulation class and its parameter information and modulates the random bit stream with the same modulation class and parameter to interfere with B, which forms reactive symbol-level interference.
At this time, the signal received by the legitimate receiver B can be expressed as:
where x (t) represents the time domain signal of unit energy of a transmission, J (t) represents the interference applied by the interferer J, and has the same modulation scheme and energy as x (t). E represents the signal energy and β represents the Power Difference Ratio (Power Difference Ratio) of the interference signal to the signal, where β > 0.Δ θ represents the Phase Offset (Phase Offset) between the interference signal and the original signal. n (t) represents white gaussian noise on the channel. α represents an interference ratio (Jamming ratio), and is defined as follows:
i.e., the ratio of the time of successful interference to the total signal transmission time. Note that in a typical communication system, an interleaver is used to achieve diversity and code error correction. Therefore, the interleaver will apply the influence of interference randomly to the data, and the interference rate can be equated to the probability that the symbol is interfered.
In the adjusting method provided by the application, information is transmitted by the index position of an activated frequency point in available frequency points provided by a plurality of paths of frequency hopping patterns. Because the interference party can only interfere with the channel with energy, the silent frequency points of the untransmitted symbols in the frequency hopping pattern frequency points cannot be detected and tracked. Therefore, reactive symbol-level interference can only be applied at the active frequency points. Taking BPSK modulation as an example, the signal of the receiving end without interference can be represented by a random variable as:
wherein the content of the first and second substances,
mean 0 and variance σ 2 Complex white gaussian noise random variable. Y is Active Indicating a received signal on an active channel, Y idle Representing the signal received on the silent channel. According to the system model in section III, the receiving end signal when the IM-FHSS modulated by BPSK is interfered can be represented as:
where cos (Δ θ) J represents the interference signal mapped on the real axis. J denotes BPSK symbols modulated by random bits, i.e.
It can be seen that when β is 1 and Δ θ is 0, the interference signal has the same amplitude as the original signal and no phase deviation, and the energy correlation degree is strongest. To characterize the degree of energy correlation between the interference signal and the communication signal, the energy correlation coefficient of the reactive symbol-level interference of the BPSK signal is defined as:
when β cos (Δ θ) is 1, the interference has the same energy as the signal, and the energy correlation is strongest, and C is + ∞. When β is 0 or β cos (Δ θ) is 2, the interference signal is independent of the signal energy, and C is 1. When β cos (Δ θ) > 1, the degree of energy independence is greater, where C ≈ 0. Therefore, for BPSK modulated interference signals of different energies, the energy correlation degree with the original BPSK signal can be calculated by the above formula.
Fig. 5 shows the effect of different energy-related coefficients on the probability distribution function of a received signal before and after interference. Wherein, fig. 5 (a) shows the received signal at the non-interference activated frequency point, fig. 5 (b) shows the received signal at the silent frequency point, fig. 5 (c) shows the received signal at the activated frequency point where energy-related interference is applied, and fig. 5 (d) shows the received signal at the activated frequency point where energy-unrelated interference is applied. Since IM-FHSS employs an energy maximum likelihood detection algorithm, comparing the energies in (a) and (b) can distinguish Y Active And Y idle . When C ═ infinity, as shown in (C), a complete energy offset phenomenon (energy offset) occurs, which causes
Half of the probability of coincidence with the received signal of the silent channel will cause an erroneous decision of the signal; when C is 1, then
Half of the probability keeps the energy unchanged, and half of the probability signal energy is enhanced (energy enhancement), which leads to certain improvement of the bit error rate of the system. Further, when C < 1, it is obvious that the distribution function of the received signal will deviate from the signal distribution of the silent channel, the signal energy of the active channel will be enhanced by the interference signal, and the bit error rate of the system will be significantly reduced.
In one embodiment, a frequency hopping modulation apparatus based on frequency point index of a frequency hopping pattern is provided, which includes:
and the frequency hopping pattern coding module is used for coding each frequency hopping pattern in one frequency hopping period according to a preset coding rule to obtain the frequency hopping pattern coded data of each frequency hopping pattern.
And the communication data coding module is used for activating the corresponding frequency hopping patterns in each frequency hopping period, and the index communication transmission data to be transmitted are formed by the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns.
And the communication data recovery module is used for obtaining corresponding index communication transmission data according to the activated frequency hopping patterns in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns.
In one embodiment, the index communication transmission data includes a transmission mode identification bit. And the communication data recovery module is used for demodulating the index communication transmission data to obtain the modulation communication transmission data when the value of the transmission mode identification bit corresponds to the high-frequency spectrum utilization rate mode.
In one embodiment, the system further comprises an activated frequency hopping pattern frequency point detection module, which is used for comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point by using the maximum energy likelihood detector in each frequency hopping period, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
In one embodiment, the system further comprises a frequency hopping pattern frequency point generation module, configured to generate frequency hopping pattern frequency points of each frequency hopping period based on the pseudo random code. Or, based on the real-time value and a preset initial key, generating the frequency hopping pattern frequency points of each frequency hopping period through nonlinear change.
For specific limitation of the frequency hopping modulation device based on the frequency point index of the frequency hopping pattern, reference may be made to the above limitation on the frequency hopping modulation method based on the frequency point index of the frequency hopping pattern, which is not described herein again. All or part of the modules in the frequency hopping modulation device based on the frequency point index of the frequency hopping pattern can be realized by software, hardware and the combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a frequency hopping modulation method based on frequency point indices of a frequency hopping pattern. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is provided a computer device comprising a memory storing a computer program and a processor implementing the following steps when the processor executes the computer program:
and coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point.
And activating the corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
In one embodiment, the index communication transmission data includes a transmission mode identification bit. The processor, when executing the computer program, further performs the steps of: and when the value of the transmission mode identification bit corresponds to the high-frequency spectrum utilization rate mode, demodulating the index communication transmission data to obtain modulation communication transmission data.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and respectively using an energy maximum likelihood detector in each frequency hopping period, comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
In one embodiment, the processor when executing the computer program further performs the steps of: frequency hopping pattern frequency points of each frequency hopping period are generated based on the pseudo random codes. Or, based on the real-time value and a preset initial key, generating the frequency hopping pattern frequency points of each frequency hopping period through nonlinear change.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
and coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point.
And activating the corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
And obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
In one embodiment, the index communication transmission data includes a transmission mode identification bit. The computer program when executed by the processor further realizes the steps of: and when the value of the transmission mode identification bit corresponds to the high-frequency spectrum utilization rate mode, demodulating the index communication transmission data to obtain modulation communication transmission data.
In one embodiment, the computer program when executed by the processor further performs the steps of: and respectively using an energy maximum likelihood detector in each frequency hopping period, comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
In one embodiment, the computer program when executed by the processor further performs the steps of: frequency hopping pattern frequency points of each frequency hopping period are generated based on the pseudo random codes. Or, based on the real-time value and a preset initial key, generating the frequency hopping pattern frequency points of each frequency hopping period through nonlinear change.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A frequency hopping modulation method based on frequency hopping pattern frequency point index is characterized by comprising the following steps:
coding each frequency hopping pattern frequency point in a frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point;
activating corresponding frequency hopping pattern frequency points in each frequency hopping period, and forming index communication transmission data to be transmitted by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points;
and obtaining corresponding index communication transmission data according to the activated frequency hopping pattern frequency points in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
2. The method of claim 1, wherein the index communication transmission data includes a transmission mode identification bit;
the method further comprises the following steps:
and when the value of the transmission mode identification bit corresponds to a high-frequency spectrum utilization rate mode, demodulating the index communication transmission data to obtain modulation communication transmission data.
3. The method of claim 1, wherein obtaining the frequency hopping pattern frequency points activated in each frequency hopping period in the communication signal comprises:
and respectively using an energy maximum likelihood detector in each frequency hopping period, comparing the signal energy of the communication signal in the channel corresponding to each frequency hopping pattern frequency point, and obtaining the activated frequency hopping pattern frequency point in each frequency hopping period according to the signal energy value.
4. The method of claim 1, wherein the frequency hopping pattern frequency points are generated in a manner that comprises:
frequency hopping pattern frequency points of each frequency hopping period are generated based on the pseudo random codes.
5. The method of claim 1, wherein the frequency hopping pattern frequency points are generated in a manner that comprises:
and generating the frequency hopping pattern frequency points of each frequency hopping period through nonlinear change based on the real-time value and a preset initial key.
6. A frequency hopping modulation device based on frequency point index of frequency hopping pattern, the device includes:
the frequency hopping pattern coding module is used for coding each frequency hopping pattern in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern;
the communication data coding module is used for activating corresponding frequency hopping patterns in each frequency hopping period, and the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns form index communication transmission data to be sent;
and the communication data recovery module is used for obtaining corresponding index communication transmission data according to the activated frequency hopping patterns in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping patterns.
7. A frequency hopping modulation system based on frequency point index of a frequency hopping pattern is characterized by comprising a sending end and a receiving end;
the sending end comprises an index mapping unit, and the index mapping unit is used for coding each frequency hopping pattern frequency point in one frequency hopping period according to a preset coding rule to obtain frequency hopping pattern coded data of each frequency hopping pattern frequency point, activating the corresponding frequency hopping pattern frequency point in each frequency hopping period, and forming index communication transmission data to be sent by the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency point;
the receiving end comprises an index demapping unit, and the index demapping unit is used for obtaining corresponding index communication transmission data according to the frequency hopping pattern frequency points activated in each frequency hopping period in the received communication signals and the frequency hopping pattern coded data corresponding to the activated frequency hopping pattern frequency points.
8. The system according to claim 7, wherein the transmitting end further comprises a bit divider for dividing data to be transmitted into index communication transmission data and modulation communication transmission data;
and the receiving end acquires a transmission mode identification bit in the index communication transmission data, and demodulates the index communication transmission data when the value of the transmission mode identification bit corresponds to a high-frequency spectrum utilization rate mode to obtain the modulation communication transmission data.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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