CN113709079A - Frequency hopping method and device for OFDM communication system - Google Patents
Frequency hopping method and device for OFDM communication system Download PDFInfo
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- CN113709079A CN113709079A CN202110913267.XA CN202110913267A CN113709079A CN 113709079 A CN113709079 A CN 113709079A CN 202110913267 A CN202110913267 A CN 202110913267A CN 113709079 A CN113709079 A CN 113709079A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H04B1/713—Spread spectrum techniques using frequency hopping
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Abstract
The invention provides a frequency hopping method for an OFDM communication system, wherein a transmitting end at least comprises a first transmitting antenna Sm and a second transmitting antenna Sn, and a receiving end at least comprises a first receiving antenna Rm and a second receiving antenna Rn, the method comprises the following steps: the transmitting and receiving end communicates through a transmitting end antenna Sm and a receiving end antenna Rm, and stays at a source frequency f1 according to map indication for data transmission and reception; at a preset advanced access moment, an antenna Sn at a transmitting end and an antenna Rn at a receiving end respectively execute advanced access operation, data are transmitted and received at a frequency f2, the frequency access operation is completed by the antenna Sn at the transmitting end and the antenna Rn at the receiving end, and f2 frequency residence is respectively started; the antenna Sm and the antenna Rm stop data transmission at the end of the frequency hopping period T. Based on the embodiment of the invention, the frequency-changing time delay can be reduced or even eliminated, zero-time-delay hopping to a new frequency at the frequency-hopping moment is realized, and the communication performance of the system is improved while the anti-interference capability of the system is ensured.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a frequency hopping system, a frequency hopping apparatus, and a frequency hopping method based on dual connectivity in an OFDM communication system.
Background
Ultra-high definition video services put forward a high-rate transmission demand on a wireless communication system, and in order to meet the demand, a broadband OFDM technology can be applied to the wireless communication system. OFDM is a multi-carrier modulation transmission scheme, in which serial data streams are converted from serial to parallel to form multiple parallel sub-data streams, and then the multiple orthogonal sub-carriers are used for parallel transmission. Due to the orthogonality among the subcarriers, a guard band does not need to be placed among the subcarriers, and the OFDM technology can obtain higher spectral efficiency on limited spectrum resources. Meanwhile, the OFDM technology has good bandwidth expansibility, and can effectively meet the requirement of high-rate service transmission by applying the OFDM technology on a larger bandwidth.
Under a military communication scene, service transmission needs to meet the requirements of resisting interference of an enemy besides the requirement of high speed, so as to ensure that instructions of the enemy are issued smoothly. To meet this transmission requirement, frequency hopping communication techniques may be employed on the basis of wideband OFDM techniques. The frequency hopping communication means that radio frequency hops pseudo-randomly and synchronously in a discrete frequency form in an appointed frequency table under the control of the same synchronization algorithm and pseudo-random frequency hopping pattern algorithm by two communication parties. Frequency hopping communication relies on numerous radio frequencies to spread the interference power of an adversary so that the system can still operate effectively under the condition that a certain number of communication frequencies are interfered. Meanwhile, the hopping speed of the frequency hopping communication is higher than that of the tracking interference machine, and the randomness and the nonlinearity of a frequency hopping pattern are adopted, so that tracking interference can be avoided.
Under the existing frequency hopping mechanism, certain time is needed for switching the frequency hopping center frequency point, so that the communication performance of the frequency hopping communication system is obviously reduced compared with that of a fixed frequency communication system. The specific reason is that the duration of each hop of the frequency hopping mechanism is a frequency hopping period, which includes the sum of the frequency hopping time and the frequency dwell time. The frequency conversion time is the time required by the transient process of switching the frequency of the channel unit, and is mainly caused by the switching time of the frequency synthesizer, the rising time and the falling time of the channel unit and other factors. In order to ensure effective frequency hopping communication, the frequency switching time is generally required to be less than 10% of the frequency hopping period and maximally not more than 20%, and during the frequency switching period, the output frequency of the frequency synthesizer is in an uncontrollable state and cannot transmit effective information. During the frequency conversion period, if the information is not processed, the information corresponding to the frequency conversion time is lost, which causes communication interruption, for the completeness of information transmission, the original continuous data stream needs to be compressed at the transmitting end and transmitted during the frequency residence period, and the interrupted compressed data stream needs to be decompressed at the receiving end to be restored into a continuous data stream. Therefore, the actual data rate of the transmission in the hopping channel is higher than the original data rate, which results in a decrease in the bit signal-to-noise ratio (under the same signal power and channel condition), an increase in the transmission error rate, and a lower supportable hopping rate. In addition, frequency hopping synchronization errors, bit synchronization errors, channel machine tuning errors, sensitivity errors of frequency points of a receiver and the like cause inherent loss of frequency hopping processing, or frequency hopping signals are damaged in processing, so that the frequency hopping communication distance is generally shortened by about 1/5 compared with the fixed frequency communication distance under the conditions of no interference and equal power.
Disclosure of Invention
The present invention is directed to the above problem, and according to a first aspect of the present invention, a frequency hopping method for an OFDM communication system is provided, wherein a transmitting end at least includes a first transmitting antenna Sm and a second transmitting antenna Sn, and a receiving end at least includes a first receiving antenna Rm and a second receiving antenna Rn, the method comprising:
step 200: the transmitting and receiving end communicates through a transmitting end antenna Sm and a receiving end antenna Rm, and stays at a source frequency f1 according to map indication for data transmission and reception;
step 300: the transmitting end transmits the next frequency hopping carrier central frequency point to the up-conversion module through the map interface, and the receiving end transmits the next frequency hopping carrier central frequency point to the down-conversion module through the map interface;
step 400: at a preset advanced access moment, an antenna Sn at a transmitting end and an antenna Rn at a receiving end respectively execute advanced access operation, data are transmitted and received at a frequency f2, the frequency access operation is completed by the antenna Sn at the transmitting end and the antenna Rn at the receiving end, and f2 frequency residence is respectively started;
step 500: stopping data transmission when the antenna Sm of the transmitting end and the antenna Rm of the receiving end finish the frequency hopping period T;
step 600: in the data transmission process, step 200 and step 500 are executed in a loop according to the frequency specified by the frequency hopping map and the access time ahead determined by the frequency hopping time decision module.
In one embodiment of the present invention, further comprising:
step 100: after the transceiver is switched on the initial frequency f1, the transceiver performs frequency hopping synchronization, and the receiver performs frequency hopping initial synchronization and maintains the frequency hopping synchronization in the next time.
In one embodiment of the present invention, step 300 further comprises:
the frequency hopping time decision module of the sending end adopts an intelligent algorithm to carry out advanced access time optimization according to the frequency resource competition condition and the service priority, determines the optimal moment of accessing the target frequency in advance, and transmits the intelligent algorithm parameters to the receiving end through real-time CI or other RRC signaling.
In one embodiment of the present invention, wherein step 400 further comprises: and when the number of the antennas is more than 2, selecting the antenna Sn at the transmitting end and the antenna Rn at the receiving end according to a preset standard.
In one embodiment of the invention, the criterion is antenna load.
According to a second aspect of the present invention, there is provided a transmitting end frequency hopping apparatus for a frequency hopping method of an OFDM communication system of the present invention, comprising a pseudo random sequence generator, a frequency hopping pattern, and a frequency hopping time decision module;
wherein the pseudo-random sequence generator generates a pseudo-random sequence according to a related parameter agreed by a transceiving terminal,
the frequency hopping pattern records the mapping relation between random numbers and the central frequency points of frequency hopping carrier waves, the frequency hopping pattern comprises a pattern interface, the pattern interface of the frequency hopping pattern is used for transmitting the configuration information of the central frequency points of the frequency hopping carrier waves to an up-conversion module,
and the frequency hopping time decision module determines the advanced access time of the dual-connection frequency hopping.
According to a third aspect of the present invention, there is provided a receiving end frequency hopping apparatus for a frequency hopping method of an OFDM communication system of the present invention, comprising a frequency hopping synchronization module of the receiving end for time and frequency synchronization of a transmitting end and the receiving end.
In one embodiment of the present invention, further comprising: pseudo-random sequence generator, frequency hopping map and frequency hopping time decision module
Wherein, the pseudo-random sequence generator generates a pseudo-random sequence which is the same as the sending end according to the appointed related parameters,
the frequency hopping pattern records the mapping relation between random numbers and the central frequency points of frequency hopping carrier waves, the frequency hopping pattern comprises a pattern interface, the pattern interface of the frequency hopping pattern is used for transmitting the configuration information of the central frequency points of the frequency hopping carrier waves to the down-conversion module,
and the frequency hopping time decision module determines the advanced access time of the dual-connection frequency hopping.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium having stored therein one or more computer programs which, when executed, are for implementing the frequency hopping method for an OFDM communication system of the present invention.
According to a fifth aspect of the invention, there is provided a computing system comprising:
a storage device, and one or more processors;
wherein the storage means is adapted to store one or more computer programs which, when executed by the processor, are adapted to implement the frequency hopping method for an OFDM communication system of the invention.
Compared with the prior art, the invention has the advantages that the frequency-shifting time delay can be reduced or even eliminated, the zero-time-delay hopping to the new frequency at the frequency-hopping moment is realized, and the communication performance of the system is improved while the anti-interference capability of the system is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic diagram of two core modules, a transmitting end and a receiving end, according to an embodiment of the present invention;
FIG. 2(a) shows a conventional frequency hopping, frequency occupancy diagram within a hopping period;
fig. 2(b) shows a diagram of dual-connection frequency hopping, frequency occupation within a frequency hopping period, and advanced access according to an embodiment of the invention.
Detailed Description
In order to reduce the influence of frequency conversion time on the system performance in the frequency hopping process, the invention provides a frequency hopping device and a frequency hopping method based on double connections for an OFDM system. Based on the frequency hopping map, the transmitting terminal and the receiving terminal carry out frequency-changing switching operation in advance, the target frequency indicated by the frequency hopping map is accessed in advance, the frequency-changing time delay is reduced or even eliminated, and the purpose that the frequency is close to zero time delay at the frequency hopping moment and is changed to a new frequency is achieved. In addition, because the advance access time affects the resource utilization rate and the frequency hopping performance of the whole system, the invention designs an intelligent advance access time optimization mechanism, and determines the optimal advance access time according to the resource state of the system, the priority of the service and the like.
Frequency hopping device based on multiple antennas
The invention provides a frequency hopping system and a frequency hopping device based on multiple antennas, wherein the system consists of a sending end and a receiving end, and is shown in figure 1. The transmitting end comprises an antenna Sm and an antenna Sn; the receiving end includes antennas Rm and Rn. The frequency hopping module of the sending end consists of a pseudo-random sequence generator 101, a frequency hopping map 103 and a frequency hopping time decision module 102, and is used for configuring a carrier central frequency point for transmission and realizing frequency hopping by switching the carrier central frequency point. The pseudo random sequence generator generates pseudo random number sequences according to parameters appointed by the transceiving end, such as the take-off time, the frequency hopping period, the hopping pattern ID and the like. The frequency hopping map records the mapping relation between the random number and the center frequency point of the frequency hopping carrier, and the configuration information of the center frequency point of the frequency hopping carrier is transmitted to the up-conversion module through the map interface. The frequency hopping time decision unit operates an intelligent algorithm to determine the advanced access time of the dual-connection frequency hopping, and transmits the advanced access time to the receiving end through a real-time link Control (CI) or other Radio Resource Control (RRC) signaling, and at the given advanced access time, an antenna of the transmitting end is accessed to the target hopping frequency in advance, so that the frequency conversion time delay is reduced or even eliminated, and the zero-delay hopping to the new frequency at the frequency hopping time is realized.
Correspondingly, the frequency hopping module of the receiving end consists of a pseudo-random sequence generator (201), a frequency hopping map (203), a frequency hopping time decision module (202) and a frequency hopping synchronization module (204). The pseudo-random sequence generators of the receiving end and the sending end can generate the same pseudo-random sequence according to the appointed related parameters, the receiving end and the sending end have the same frequency hopping map, and the frequency hopping time decision module of the receiving end receives the intelligent algorithm parameters of the sending end to configure consistent advanced access time. Compared with the sending end, due to the strict requirement of time synchronization for frequency hopping switching, the frequency hopping module of the receiving end is additionally provided with the frequency hopping synchronization module which is used for time and frequency synchronization of the sending end and the receiving end, the sending end and the receiving end are kept to jump at the same moment and the same carrier wave center frequency, synchronization is maintained in the frequency hopping process, and the problem of frequency hopping desynchronization caused by factors such as clock drift is avoided.
In order to effectively support the dual-connection frequency hopping method, the transmitting end and the receiving end include a plurality of transmitting and receiving antennas (i.e., the number is greater than or equal to 2).
In a specific implementation, a broadband OFDM frequency hopping system based on multiple antennas as shown in fig. 1 may be employed. According to other embodiments of the invention, the sending end informs the receiving end of the change of the frequency hopping pattern and the advanced access time through signaling such as real-time CI or RRC, so that the design of the receiving end can be simplified, and a pseudo-random sequence generator, the frequency hopping pattern and a frequency hopping time decision module are omitted. In another embodiment, the sink node or other third party nodes in the network signal the changes of the frequency hopping patterns and the advanced access time of the receiving end and the transmitting end, and the pseudo random sequence generator, the frequency hopping patterns and the frequency hopping time decision module of the transmitting end and the receiving end can be omitted.
Frequency hopping method based on double connections
According to an embodiment of the invention, a frequency hopping method based on dual connection is provided, frequency conversion operation is carried out in advance through antennas of a sending end and a receiving end, the target frequency is switched, frequency conversion time delay is reduced or even eliminated, and the purpose that the frequency is close to zero time delay at the frequency hopping time and is converted into new frequency is achieved.
Fig. 2(a) shows a schematic diagram of frequency occupation in a conventional frequency hopping, frequency hopping cycle, and it can be seen that there is no overlap in the time periods occupying different frequencies.
To describe the method of the invention in detail, first 2 time units are defined: t21 and t20, where t21 is the frequency conversion time, and t20 is the time of accessing the target frequency in advance. Referring to fig. 1 and 2(b), the antenna Sm of the transmitting end and the antenna Rm of the receiving end reside at a source frequency f1 for data transmission and reception. Before the f1 hopping period T ends, that is, before the frequency change time T21, another antenna Sn at the transmitting end and another antenna Rn at the receiving end perform an early access operation at time T20(T20 is less than or equal to T21), and start data transmission at the frequency f2, that is, access the frequency f2 in advance of the time period T21-T20. And f2 frequency residing is started when the antenna Sn at the transmitting end and the antenna Rn at the receiving end all finish the frequency accessing operation. And the antenna Sm of the transmitting end and the antenna Rm of the receiving end stop data transmission when the frequency hopping period T is finished. Therefore, compared with the conventional frequency hopping scheme (as shown in fig. 2 (a)), the proposed frequency hopping device and method based on dual connectivity can reduce or even eliminate the frequency hopping delay, and realize zero-delay hopping to a new frequency at the frequency hopping moment. The specific advanced access time affects the resource utilization rate and the frequency hopping performance of the whole system, and the longer the advanced access time is, the shorter the remaining frequency-changing time is, the shorter the frequency hopping time delay is, the higher the transmission quality of data is and the longer the transmission distance is. However, the more frequency resources the service occupies, the lower the system resource utilization rate. Therefore, a specific advanced access time needs to be designed to achieve the balance of performance and efficiency. Therefore, according to an embodiment of the present invention, an intelligent advance access time optimization mechanism may be adopted, a frequency hopping time decision module is introduced into a system device, an artificial intelligence algorithm is adopted to analyze historical system states (such as frequency resource competition and frequency interference) and service demand states (service types, QoS, and the like), predict the system states and service demand states in the current and next frequency hopping periods, and determine the optimal access time with the goal of ensuring the anti-interference capability of the system and the QoS of the service according to the system states, the priority of the service, and the like.
According to one embodiment of the present invention, the frequency hopping method includes the steps of:
step 1: after the transceiver is switched on the initial frequency f1, the frequency hopping synchronization of the transceiver is performed. And the frequency hopping synchronization module at the receiving end carries out frequency hopping initial synchronization and carries out frequency hopping synchronization maintenance in the following time.
Step 2: the transmitting and receiving ends communicate through the transmitting end antenna Sm and the receiving end antenna Rm. Data transmission and reception, respectively, resides at the source frequency f1 according to the map indication.
And step 3: and the transmitting end and the receiving end respectively transmit the next frequency hopping carrier central frequency point to the up-conversion module through the map interface. The sending end frequency hopping time decision module performs advanced access time optimization according to frequency resource competition conditions, service priority and the like by adopting an intelligent algorithm, determines the optimal time t20 of advanced access of the target frequency, and transmits intelligent algorithm parameters to a receiving end through real-time CI or other RRC signaling. And a frequency hopping time decision unit of the receiving end receives the intelligent algorithm parameters of the transmitting end to configure consistent advanced access time.
And 4, step 4: at time t20 when the target frequency is accessed in advance, the antenna Sn at the transmitting end and the antenna Rn at the receiving end perform the advanced access operation, respectively, and start data transmission and reception at the frequency f 2. And f2 frequency residence is respectively started after the antenna Sn at the transmitting end and the antenna Rn at the receiving end complete the frequency access operation.
And 5: and the antenna Sm of the transmitting end and the antenna Rm of the receiving end stop data transmission when the frequency hopping period T is finished.
Step 6: and in the data transmission process, circularly executing the step 2-5 according to the frequency specified by the frequency hopping map and the advanced access time determined by the frequency hopping time decision module.
When the number of antennas is greater than 2, the antennas Sn at the transmitting end and the antennas Rn at the receiving end need to be selected according to a certain criterion (such as antenna load, etc.), and after the selection is completed, the same procedure as that for the number of antennas 2 is performed.
According to an embodiment of the present invention, in step 3, the transmitting end directly informs the receiving end of the change of the central frequency point and the advanced access time of the next frequency hopping carrier through signaling such as real-time CI or RRC, and the receiving end configures consistent frequency and advanced access time. Therefore, the design of a receiving end can be simplified, and a pseudo-random sequence generator, a frequency hopping map and a frequency hopping time decision module of the receiving end are removed.
The previous description is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Moreover, all or a portion of any aspect and/or embodiment may be utilized with all or a portion of any other aspect and/or embodiment, unless stated otherwise. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A frequency hopping method for an OFDM communication system, wherein a transmitting end includes at least a first transmitting antenna Sm and a second transmitting antenna Sn, and a receiving end includes at least a first receiving antenna Rm and a second receiving antenna Rn, the method comprising:
step 200: the transmitting and receiving end communicates through a transmitting end antenna Sm and a receiving end antenna Rm, and stays at a source frequency f1 according to map indication for data transmission and reception;
step 300: the transmitting end transmits the next frequency hopping carrier central frequency point to the up-conversion module through the map interface, and the receiving end transmits the next frequency hopping carrier central frequency point to the down-conversion module through the map interface;
step 400: at a preset advanced access moment, an antenna Sn at a transmitting end and an antenna Rn at a receiving end respectively execute advanced access operation, data are transmitted and received at a frequency f2, the frequency access operation is completed by the antenna Sn at the transmitting end and the antenna Rn at the receiving end, and f2 frequency residence is respectively started;
step 500: stopping data transmission when the antenna Sm of the transmitting end and the antenna Rm of the receiving end finish the frequency hopping period T;
step 600: in the data transmission process, step 200 and step 500 are executed in a loop according to the frequency specified by the frequency hopping map and the access time ahead determined by the frequency hopping time decision module.
2. The method of claim 1, further comprising:
step 100: after the transceiver is switched on the initial frequency f1, the transceiver performs frequency hopping synchronization, and the receiver performs frequency hopping initial synchronization and maintains the frequency hopping synchronization in the next time.
3. The method of claim 1, wherein step 300 further comprises:
the frequency hopping time decision module of the sending end adopts an intelligent algorithm to carry out advanced access time optimization according to the frequency resource competition condition and the service priority, determines the optimal moment of accessing the target frequency in advance, and transmits the intelligent algorithm parameters to the receiving end through real-time CI or other RRC signaling.
4. The method of claim 1, wherein step 400 further comprises: and when the number of the antennas is more than 2, selecting the antenna Sn at the transmitting end and the antenna Rn at the receiving end according to a preset standard.
5. The method of claim 4, wherein the criteria is antenna loading.
6. A transmitting-end frequency hopping apparatus for implementing the method of any one of claims 1 to 5, comprising a pseudo random sequence generator, a frequency hopping pattern, and a frequency hopping time decision module;
wherein the pseudo-random sequence generator generates a pseudo-random sequence according to a related parameter agreed by a transceiving terminal,
the frequency hopping pattern records the mapping relation between random numbers and the central frequency points of frequency hopping carrier waves, the frequency hopping pattern comprises a pattern interface, the pattern interface of the frequency hopping pattern is used for transmitting the configuration information of the central frequency points of the frequency hopping carrier waves to an up-conversion module,
and the frequency hopping time decision module determines the advanced access time of the dual-connection frequency hopping.
7. A receiving-end frequency hopping apparatus for implementing the method of any one of claims 1 to 5, comprising a frequency hopping synchronization module of the receiving end for time and frequency synchronization of the transmitting end and the receiving end.
8. The apparatus of claim 7, further comprising: pseudo-random sequence generator, frequency hopping map and frequency hopping time decision module
Wherein, the pseudo-random sequence generator generates a pseudo-random sequence which is the same as the sending end according to the appointed related parameters,
the frequency hopping pattern records the mapping relation between random numbers and the central frequency points of frequency hopping carrier waves, the frequency hopping pattern comprises a pattern interface, the pattern interface of the frequency hopping pattern is used for transmitting the configuration information of the central frequency points of the frequency hopping carrier waves to the down-conversion module,
and the frequency hopping time decision module determines the advanced access time of the dual-connection frequency hopping.
9. A computer-readable storage medium, in which one or more computer programs are stored, which when executed, are for implementing the method of any one of claims 1-5.
10. A computing system, comprising:
a storage device, and one or more processors;
wherein the storage means is for storing one or more computer programs which, when executed by the processor, are for implementing the method of any one of claims 1-5.
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