CN117895971A - Wide area frequency fast switching method - Google Patents
Wide area frequency fast switching method Download PDFInfo
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Abstract
The invention discloses a wide area frequency fast switching method, which comprises the following steps: dividing a plurality of logic channels according to the application frequency range of the communication equipment; designing a plurality of groups of radio frequency front ends according to the range of the logic channel, wherein the radio frequency efficiency of the same radio frequency front end is consistent in the physical frequency band bandwidth; debugging the radio frequency front ends of different frequency bands respectively; calibrating each logic channel respectively, and forming adjacent logic channels into the same frequency band group, wherein one frequency band group comprises a plurality of logic channels with consistent or approximate calibration parameters; recording the calibrated parameters in the chip; switching frequency. The invention can realize the rapid switching of the frequency and improve the safety performance of the communication equipment. The same-parameter logic channel classification BG design can reduce the chip storage space, effectively reduce the frequency hopping time when the switching time accords with the contract group condition, and improve the efficiency.
Description
Technical Field
The invention belongs to the technical field of chips, and particularly relates to a wide-area frequency rapid switching method.
Background
With the development of technology, communication networks are increasingly widely used. Communication equipment generally comprises one or more radio frequency transmitting and receiving modules, and continuously transmitted electromagnetic wave information greatly increases signal interference. Currently, in order to solve the interference of signals, there are some methods based on hardware or software, when the communication device encounters interference or occupied frequency band, the communication system generally adopts frequency hopping technology to increase anti-interference capability, so as to avoid poor communication or reduce data loss to the minimum. The current mainstream designs use the same RFFE-defined frequency range for frequency hopping. The defect of this is that the logic channel is easy to be detected and locked, if the frequency bandwidth is not large, the logic channel is easy to be covered by the interference source as a whole, so that the communication error rate is improved and even the communication is invalid.
Disclosure of Invention
In order to solve the problems, the invention discloses a wide area frequency rapid switching method which is realized based on in-band digital frequency hopping combined with physical frequency band rapid switching. For any frequency working range, the physical frequency band bandwidth needs to be measured in advance to divide the logic channels, and then the corresponding radio frequency channels are designed.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a wide area frequency fast switching method comprises the following steps:
Step one, dividing a plurality of logic channels according to the application frequency range of the communication equipment;
designing a plurality of groups of radio frequency front ends according to the range of the logic channel, wherein the radio frequency efficiency of the same radio frequency front end in the physical frequency band bandwidth is consistent; debugging the radio frequency front ends of different frequency bands respectively;
Step three, calibrating the logic channels respectively
Calibrating each logic channel respectively, and forming a same frequency band group by a plurality of logic channels with continuous positions and consistent calibration parameters or differences within a preset range;
Step four, recording the calibrated parameters in the chip
Recording the parameters calibrated in the step three in a chip, wherein only one group of parameters is recorded in one frequency band group;
step five, switching frequency
When frequency hopping is carried out to the same logic channel or to different logic channels of the same frequency band group, parameters do not need to be called again;
when frequency hopping is carried out to logic channels of different frequency band groups of the same radio frequency front end, parameters need to be recalled;
when hopping to a logical channel in a different radio frequency front end, the parameters need to be recalled.
Further, the calibration in the third step is to modulate the characteristics of each part on the communication transceiver link.
Further, the characteristics include: digital, analog, and radio frequency.
Further, in the fifth step, when the frequency is hopped to different frequencies in the same logic channel, the hopping time=instruction execution time.
Further, in the fifth step, when hopping to different logic channels of the same band group, the hopping time=negotiation/handshake time+instruction execution time.
Further, in the fifth step, when frequency hopping is performed to logic channels of different band groups in the same rf front end, the frequency hopping time=negotiation/handshake time+call parameter time+instruction execution time.
Further, in the fifth step, when frequency hopping is performed to the logic channels of different radio frequency front ends, the frequency hopping time=negotiation/handshake time+rffe switching time+calling parameter time+instruction execution time.
The beneficial effects of the invention are as follows:
The radio frequency channel designed by the method can cover a wider frequency range, and can realize the rapid switching of the frequency on the basis of the wide frequency range, thereby improving the safety performance of communication equipment. The large-range frequency hopping can avoid the defect that the prior art is easy to detect and lock, greatly reduce the influence of an interference source and keep the communication safe and smooth. The same-parameter logic channel classification BG design can reduce the chip storage space, effectively reduce the frequency hopping time when the switch time accords with the contract group condition, improve the efficiency, reduce the chip area and save the system development cost.
Drawings
Fig. 1 is a schematic structural diagram of a communication device.
Fig. 2 is a schematic diagram of an RFFE radio frequency front end designed with three different frequency bands.
Fig. 3 is a schematic diagram of the same group hopping.
Fig. 4 is a schematic diagram of different group hopping.
Fig. 5 is a schematic diagram of heterogeneous frequency hopping.
Fig. 6 is a schematic diagram of in-band frequency hopping.
Detailed Description
The technical scheme provided by the present invention will be described in detail with reference to the following specific examples, and it should be understood that the following specific examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
The present embodiment will be described by taking a communication device as an example as shown in fig. 1. The communication equipment comprises Application Platform application platforms, an RFSW radio frequency switch and an RFFE radio frequency front end. The application platform comprises a radio frequency chip, a digital chip, an analog chip and the like and a communication equipment main body, wherein the communication equipment main body is responsible for data receiving and processing and peripheral control. The RFSW radio frequency switch is responsible for connecting different radio frequency front ends with the platform and is controlled by the platform. The RFFE radio frequency front end comprises a power amplifier, a low-noise amplifier, a filtering and matching circuit and can also comprise an antenna. Wherein the active devices are controlled and powered by the platform. In fig. 1, the rf front-end is divided into three groups, which are only one example, and specific division and design should be performed according to the logic channel range. A wide area frequency fast switching method comprises the following steps:
Step one, dividing logic channels according to the application frequency range of the communication equipment.
In this example, logical channels 1-30 are planned according to the application of the communication device. The logical channel bandwidths should have consistency, i.e. the divided channels have the same width.
Step two, designing a radio frequency front end according to the logic channel range; the consistency of the radio frequency efficiency is ensured in the physical frequency band bandwidth of the radio frequency front end.
Under the condition of meeting the physical frequency band bandwidth, as shown in fig. 2, three different frequency band RFFE front ends RFFE#1 to RFFE#3 are respectively designed, so that the total bandwidth of the frequency band to be met can be covered. Each RFFE front end has 10 channels. The RFFE is debugged, so that the consistency of the radio frequency efficiency of the application bandwidth is ensured. Each radio frequency front end needs to be debugged respectively. After the RFFE of the same group is debugged, the consistency of output or receiving power and performance can be ensured, namely, the consistency accords with the error tolerance range.
And thirdly, calibrating the logic channels respectively.
The logic channel is pre-calibrated (pre-calibration refers to calling calibration parameters stored in a memory, preferably on the basis of good consistency of the output or receiving power and performance of the same set of RFFE), and the characteristics on the communication transceiver link are modulated, including digital, analog and radio frequency parts.
Calibration for the digital part includes, but is not limited to, the following:
1. Calibrating signal amplitude and phase difference;
2. compensating time sequence difference;
3. filter circuit, digital gain calibration.
Calibration for the analog part includes, but is not limited to, the following:
1. calibrating a clock, a frequency divider/frequency multiplier circuit;
2. Calibrating and compensating a phase-locked loop circuit;
3. local oscillation leakage suppression and direct current compensation calibration;
4. A filter circuit and analog gain calibration;
5. Adjacent channel noise suppression, harmonic suppression, image suppression.
Calibration for the radio frequency part includes, but is not limited to, the following:
1. modulating by a power amplifier and low-noise amplifier matching circuit;
2. filtering and matching an antenna circuit;
3. controlling the time sequence of the radio frequency front end;
4. and (5) calibrating radio frequency index parameters.
Logic channel pre-calibration includes, but is not limited to, the above actions, each time a new logic channel is switched, the correct rf front end is mapped and the above parameters are called for setting.
In the present invention, if calibration parameters of several logic channels with consecutive positions are consistent or have no obvious difference (i.e. errors are within an allowable range, for example, power flatness is not more than ±1dB, the error value is adjustable and should be preset), the calibration parameters can be classified into the same BG (band group frequency band). Thus, each logical channel may be formed into multiple band groups, and the number of logical channels in each group may be the same or different. In FIG. 2, the RF front end RFFE#1 includes channels 1-10 covering Sub-1GHz band, i.e. lower than 1GHz band; the channels 1 to 10 are divided into two groups of BG1 and BG2, and two base groups each cover 5 channels. The RFFE#2 of the radio frequency front end comprises channels 11-20, and covers an L frequency band, namely a 1-2 GHz frequency band; the channels 11-20 are divided into two groups of BG3 and BG4, and each band group covers 5 channels. The RFFE#3 of the radio frequency front end comprises channels 21-30, and covers an S frequency band, namely a 2-4 GHz frequency band; the channels 21-30 are divided into two groups of BG5 and BG6, and each band group covers 5 channels. The frequency distribution shown in the figure is only one possible example and should not be taken as a limitation of the invention.
And step four, recording the calibrated parameters in the chip.
And (3) recording the parameters of each logic channel calibrated in the step (III) in a chip. If the adjacent logic channel calibration parameters are consistent or have no obvious deviation and can be used, it is obvious that the logic channel calibration parameters in the same band group are the same, so that one band group only needs to record one group of parameters, and the parameters of each logic channel do not need to be repeatedly recorded.
The frequency points in the same logic channel can be directly used along the same parameter without additional calibration.
And fifthly, switching the frequency.
When a communication request is made to the controlled equipment, the corresponding channel is switched according to the requirement, and the pre-calibrated parameters are called. Such as hopping to the same logical Channel (Channel) or into the same logical Channel of the band group, there is no need to recall the parameters.
As shown in fig. 3, channels 1 to 10 in rffe#1 are divided into two groups, BG1 and BG2, each group using the same parameter. When receiving the frequency hopping command #1, the initial frequency is chanel, and needs to be switched to chanel and still belongs to BG1, the channels before and after frequency hopping are all in the same BG, and default pre-calibration parameters are still used. When receiving the frequency hopping instruction #2, the user needs to switch to chanel to still belong to BG1, and the channels before and after frequency hopping are in the same BG, so that parameters do not need to be called again. When switching different channels in the same group, frequency hopping time = negotiation/handshake time + instruction execution time.
As shown in fig. 4, channels 1 to 10 divided into two groups are also taken as an example. The initial frequency belongs to chanel and to BG1, when receiving the frequency hopping command #1, the switching to chanel is needed, the initial frequency belongs to BG2, the frequency channels before and after frequency hopping are in different BGs, and different pre-calibration parameters are needed to be used. When receiving the frequency hopping instruction #2, the user needs to switch to chanel, belongs to BG1, and the frequency hopping channels are in different BGs before and after frequency hopping, and parameters need to be recalled. When the frequencies before and after switching belong to different groups, the frequency hopping time=negotiation/handshake time+call parameter time+instruction execution time.
The adoption of Band group can effectively reduce the storage space of the chip and can reduce the frequency hopping time under the condition.
Fig. 3 and 4 show examples of frequency switching in the same RFFE front end. Fig. 5 shows an example of frequency hopping to different RFFE front ends, i.e., different sets of frequency hopping. In fig. 5, the initial frequency belongs to chanel2 in rffe#1, belongs to BG1, when receiving the frequency hopping command#1, needs to be switched to chanel13 in rffe#2, belongs to BG3, and the frequency hopping front and back channels are at front ends of different RFFEs, different BGs need to switch RFFEs and use different pre-calibration parameters. When receiving the frequency hopping instruction #2, the user needs to switch to chanel in the RFFE #3, belongs to BG6, and the front and rear frequency channels of frequency hopping are at the front ends of different RFFEs and different BGs, so that the user needs to switch the RFFEs and recall parameters. When receiving the frequency hopping instruction #3, the user needs to switch to chanel in the RFFE #1, belongs to BG2, and the front and rear frequency channels of frequency hopping are at the front ends of different RFFEs and different BGs, so that the user needs to switch the RFFEs and recall parameters. When receiving the frequency hopping instruction #4, chanel in the RFFE #3 needs to be switched to belong to BG6, and before and after frequency hopping, the channels are at the front ends of different RFFEs, and the RFFEs need to be switched to different BGs and parameters need to be recalled. When the frequencies before and after switching belong to different RFFE front ends, the frequency hopping time=negotiation/handshake time+rffe switching time+call parameter time+instruction execution time.
Fig. 6 is a schematic diagram of frequency hopping within the same channel. The shift to f 1 for fm command #1 and to f 2 for frequency … … uses the same default calibration parameters (i.e., current calibration parameters) due to the frequency hopping within the same pre-calibrated logic channel, and no additional negotiation time is required. Frequency hopping time = instruction execution time.
It should be noted that the foregoing merely illustrates the technical idea of the present invention and is not intended to limit the scope of the present invention, and that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention, which fall within the scope of the claims of the present invention.
Claims (7)
1. The wide area frequency fast switching method is characterized by comprising the following steps:
Step one, dividing a plurality of logic channels according to the application frequency range of the communication equipment;
designing a plurality of groups of radio frequency front ends according to the range of the logic channel, wherein the radio frequency efficiency of the same radio frequency front end in the physical frequency band bandwidth is consistent; debugging the radio frequency front ends of different frequency bands respectively;
Step three, calibrating the logic channels respectively
Calibrating each logic channel respectively, and forming a same frequency band group by a plurality of logic channels with continuous positions and consistent calibration parameters or differences within a preset range;
Step four, recording the calibrated parameters in the chip
Recording the parameters calibrated in the step three in a chip, wherein only one group of parameters is recorded in one frequency band group;
step five, switching frequency
When frequency hopping is carried out to the same logic channel or to different logic channels of the same frequency band group, parameters do not need to be called again;
when frequency hopping is carried out to logic channels of different frequency band groups of the same radio frequency front end, parameters need to be recalled;
when hopping to a logical channel in a different radio frequency front end, the parameters need to be recalled.
2. The method of claim 1, wherein the calibrating in the third step is performed by modulating the characteristics of each part on the communication transceiver link.
3. The wide area frequency fast switching method according to claim 2, wherein the characteristics include: digital, analog, and radio frequency.
4. The method according to claim 1, wherein in the fifth step, when hopping to different frequencies in the same logic channel, the hopping time=instruction execution time.
5. The method according to claim 1, wherein in the fifth step, when hopping frequencies into different logic channels of the same band group, the hopping frequency time=negotiation/handshake time+instruction execution time.
6. The method according to claim 1, wherein in the fifth step, when hopping frequencies to logic channels of different band groups in the same rf front end, the hopping frequency time=negotiation/handshake time+call parameter time+instruction execution time.
7. The method according to claim 1, wherein in the fifth step, when hopping frequencies into logic channels of different radio frequency front ends, the hopping frequency time=negotiation/handshake time+rffe switching time+call parameter time+instruction execution time.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158563A (en) * | 2013-05-15 | 2014-11-19 | 北京化工大学 | Frequency-hopping transmission system based on double-pattern fast synchronization method |
| CN111434046A (en) * | 2017-11-14 | 2020-07-17 | 高通股份有限公司 | Logical channel hopping sequence design |
| CN111713028A (en) * | 2018-02-08 | 2020-09-25 | 华为技术有限公司 | Frequency hopping method and device |
| CN116192190A (en) * | 2022-12-06 | 2023-05-30 | 中电科思仪科技股份有限公司 | High-speed frequency hopping signal capturing device and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158563A (en) * | 2013-05-15 | 2014-11-19 | 北京化工大学 | Frequency-hopping transmission system based on double-pattern fast synchronization method |
| CN111434046A (en) * | 2017-11-14 | 2020-07-17 | 高通股份有限公司 | Logical channel hopping sequence design |
| CN111713028A (en) * | 2018-02-08 | 2020-09-25 | 华为技术有限公司 | Frequency hopping method and device |
| CN116192190A (en) * | 2022-12-06 | 2023-05-30 | 中电科思仪科技股份有限公司 | High-speed frequency hopping signal capturing device and method |
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