CN111030729B - Communication mode decision method of frequency hopping communication system - Google Patents

Communication mode decision method of frequency hopping communication system Download PDF

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CN111030729B
CN111030729B CN201911132095.1A CN201911132095A CN111030729B CN 111030729 B CN111030729 B CN 111030729B CN 201911132095 A CN201911132095 A CN 201911132095A CN 111030729 B CN111030729 B CN 111030729B
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power
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CN111030729A (en
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吴道龙
王瑜
迟凯
茅迪
徐媛媛
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CETC 20 Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7154—Interference-related aspects with means for preventing interference

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Abstract

The invention provides a communication mode decision method of a frequency hopping communication system, which aims at the problem that the communication reliability is reduced due to the interference of partial frequency points of the frequency hopping communication system, provides a transmission mode decision method based on frequency spectrum sensing, and ensures the reliability of the system by adjusting parameters such as transmission rate, transmission power and the like under the condition of preferentially ensuring that signals do not have obvious characteristics. When the system finds interference, the interference can be resisted by adjusting the frequency modulation pattern, the speed or the transmitting power, and anti-interference measures are taken before the efficiency of the system is reduced; when the interference is continuous interference such as narrow band, wide band and the like, the system comprehensively considers the power and the bandwidth of the interference and the anti-interference capability of the system waveform, and solves the problem that the waveform has obvious characteristics caused by directly optimizing patterns; when the interference is comb interference, the system comprehensively considers the distribution and power of the interference, and solves the problem of reliable transmission under the condition of preferentially ensuring that the system waveform does not have obvious characteristics.

Description

Communication mode decision method of frequency hopping communication system
Technical Field
The invention relates to the field of digital signal processing in a frequency hopping wireless communication system, mainly aims at the decision problem of transmission rate and transmission mode after interference in the frequency hopping wireless communication system, and particularly relates to a decision method for carrying out transmission rate and transmission mode according to perceived interference signal information, which is used for processing digital signals of the frequency hopping wireless communication system.
Background
The frequency hopping communication system generally disperses different symbol symbols at different frequency points for transmission, thereby resisting interference, preventing signals from being intercepted and intercepted, and improving the transmission reliability and safety of the system. However, when several frequency points in the frequency hopping system are interfered, the reliability of the system is seriously affected. In a patent 'an integrated control method of communication, interference and immunity based on cognition', a method for improving the anti-interference performance of a system by not transmitting on interfered frequency points based on frequency spectrum cognition is provided. However, the method may cause the transmission signal to have typical characteristics, such as frequency hopping of several adjacent frequency points, etc., and the signal is easy to detect and interfere with, thus reducing the security of the system.
Another common anti-interference method is to combine the multi-stage rate of the system to improve the anti-interference performance of the transmission waveform by reducing the rate. Traditional rate decision algorithms such as ARF, AARF, ONOE algorithms, etc. all need to adjust the transmission rate down after sending a certain transmission failure, and have slow response to changes in the system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a communication mode decision method of a frequency hopping communication system. The invention provides a transmission mode decision method based on spectrum sensing aiming at the problem that the communication reliability is reduced due to the interference of partial frequency points of a frequency hopping communication system, and the reliability of the system is ensured by adjusting parameters such as transmission rate, transmission power and the like under the condition of preferentially ensuring that signals do not have obvious characteristics. And when the interference characteristics enable the system not to satisfy the reliable transmission of the full frequency point, the reliability of the system is preferentially ensured for transmission.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
step 1, calculating the SINR of all N transmission frequency points according to the result of spectrum sensingi，i∈[1，N]Counting the number L of frequency points with the signal-to-interference-and-noise ratio lower than the judgment threshold of the current transmission waveform;
step 2, judging L multiplied by NcWhether N is higher than the maximum error number N tolerable by the channel coding adopted by the current system waveformeIn which N iscIf the code length is the code length, entering the next step, otherwise, ending;
step 3, judging whether the available frequency points accord with the frequency hopping rule of the system, namely whether the frequency hopping pattern can be optimized, wherein the optimized frequency hopping pattern refers to the frequency hopping pattern which avoids the interfered frequency points and accords with the frequency hopping rule of the system, if the frequency hopping pattern can be optimized, turning to the step 4, otherwise, turning to the step 7; the frequency hopping rules of the frequency hopping systems are different, and the frequency hopping rules comprise the bandwidth required to be spaced between two adjacent hops and the bandwidth factor occupied by the frequency hopping systems;
step 4, judging whether the interfered frequency point is high-power interference, if so, turning to step 5, otherwise, turning to step 6;
step 5, transmitting at the current transmission rate by using the current transmission power and the optimized frequency hopping pattern, and ending;
step 6, reducing the first-stage transmission rate, transmitting in the full frequency band at the current transmission rate and power, and ending; the first-stage transmission rate reduction means that the demodulation transmission waveform decision threshold is lower than the current transmission rate waveform by one stage;
step 7, judging whether the current rate is the lowest transmission rate, if so, turning to step 8, otherwise, turning to step 11;
step 8, judging whether the current transmitting power is the maximum transmitting power of the system, if so, turning to step 9, otherwise, turning to step 10;
step 9, keeping the current transmission rate and the transmission power, transmitting only at the frequency points which are not interfered, and ending;
step 10, maintaining the current rate, increasing the transmission power to transmit in the current frequency hopping pattern, and ending;
and step 11, reducing the transmission rate until the system communication requirement is met, transmitting by using the current transmission power and the frequency hopping pattern, and ending.
In step 4, the high-power interference finger cannot be demodulated correctly at the lowest transmission rate.
The invention has the beneficial effects that:
1) when the system finds interference, the interference can be countered by adjusting the frequency modulation pattern, the speed or the transmitting power, and anti-interference measures are taken before the system is degraded.
2) When the interference is continuous interference such as narrow band, wide band and the like, the system comprehensively considers the power and the bandwidth of the interference and the anti-interference capability of the system waveform, and solves the problem that the waveform has obvious characteristics caused by directly optimizing the pattern.
3) When the interference is comb interference, the system comprehensively considers the distribution and power of the interference, and solves the problem of reliable transmission under the condition of preferentially ensuring that the system waveform does not have obvious characteristics.
Drawings
FIG. 1 is a decision flow diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
On the basis of frequency spectrum cognition, the invention takes overall consideration of the distribution characteristics of interference and the multi-level speed design of the system to make decisions, and improves the reliability of the system on the basis of ensuring the interception resistance and interception resistance of the system.
The present embodiment is coded by a code using (255,139) Reed-Solomon code with BPSK (symbol error rate 10)-5Demodulation threshold 3.5dB), QPSK (symbol error rate 10)-5Demodulation threshold 6.4dB), 16QAM (symbol error rate 10)-5Demodulation threshold 13dB), each modulated symbol occupies one frequency hopping frequency point to be sent, a plurality of modulated symbols corresponding to the same coded domain element are sent at the same frequency point, 30 sub-bands are counted, 50W and 100W transmission powers are provided, the frequency hopping rule is that at least 3 adjacent frequency points are required to be spaced for two adjacent hops, and the number of the used frequency points occupies more than half of the total frequency points.
Step 1, calculating the SINR of all N transmission frequency points according to the result of spectrum sensingi，i∈[1，N](signal interference noise power ratio), and counting the number L of frequency points with the signal interference noise ratio lower than the judgment threshold of the current transmission waveform;
step 2, judging L multiplied by NcWhether N is higher than the maximum error number N tolerable by the channel coding adopted by the current system waveformeIn which N iscIf the code length is the code length, entering the next step, otherwise, ending;
step 3, judging whether the available frequency points accord with the frequency hopping rule of the system, namely whether the frequency hopping pattern can be optimized, wherein the optimized frequency hopping pattern refers to the frequency hopping pattern which avoids the interfered frequency points and accords with the frequency hopping rule of the system, if the frequency hopping pattern can be optimized, turning to the step 4, otherwise, turning to the step 7; the frequency hopping rules of the frequency hopping systems are different, and the frequency hopping rules comprise the bandwidth required to be spaced between two adjacent hops and the bandwidth factor occupied by the frequency hopping systems;
step 4, judging whether the interfered frequency point is high-power interference, if so, turning to step 5, otherwise, turning to step 6, wherein the high-power interference is related to a system transmission waveform, and the high-power interference cannot be correctly demodulated at the lowest transmission rate;
step 5, transmitting at the current transmission rate by using the current transmission power and the optimized frequency hopping pattern, and ending;
step 6, reducing the first-stage transmission rate, transmitting in the full frequency band at the current transmission rate and power, and ending; the first-level transmission rate reduction refers to a transmission waveform with a demodulation threshold lower by one level (a transmission waveform judgment threshold) than that of a current transmission rate waveform;
step 7, judging whether the current rate is the lowest transmission rate, if so, turning to step 8, otherwise, turning to step 11;
step 8, judging whether the current transmitting power is the maximum transmitting power of the system, if so, turning to step 9, otherwise, turning to step 10;
step 9, keeping the current transmission rate and the transmission power, transmitting only at the frequency points which are not interfered, and ending;
step 10, maintaining the current rate, increasing the transmission power to transmit in the current frequency hopping pattern, and ending;
and step 11, reducing the transmission rate until the system communication requirement is met, transmitting by using the current transmission power and the frequency hopping pattern, and ending.
The invention senses the interference condition of each frequency point of the frequency hopping system before decision making, and carries out comprehensive decision making according to the interference condition of each frequency point and the waveform design of a transmission system. Through the decision based on the frequency spectrum cognition result, the reliability of transmission is ensured under the condition that the signal of the communication system does not have obvious characteristics and has safety; when the reliability can not be ensured at all, the system safety is sacrificed, and the transmission reliability is ensured.
1. Simulation scene 1;
1.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered sub-bands of the system is 5, the number of the interfered sub-bands is 1,6,13,19 and 27, the signal interference noise ratio of the interfered sub-bands is 9dB, and the system transmits by a 16QAM modulation mode and 50W transmitting power.
1.2. Making a decision to realize specifically;
according to the step 1, the demodulation threshold of the transmission waveform of the current system is 13dB, the number L of frequency points lower than the demodulation threshold is 5, and the step 2 is switched to, because the code length N of the (255,139) Reed-Solomon codec225, maximum number of tolerable errors Ne58, current system L5, N30,
Figure BDA0002278594410000041
less than (255,139) the maximum number of tolerable errors for Reed-Solomon will not affect (255,139) the decoding of the Reed-Solomon code, and the process is terminated directly according to step 2.
2. Simulation scene 2;
2.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered sub-bands of the system is 8, the number of the interfered sub-bands is 1,5,9,13,17,21,25 and 30, the signal interference noise ratio of the interfered sub-bands is 0dB, and the system transmits by a 16QAM modulation mode and 50W transmitting power.
2.2 decision making is specifically realized;
according to the step 1, the demodulation threshold of the transmission waveform of the current system is 13dB, the number L of frequency points lower than the demodulation threshold is 8, and the step 2 is switched to, because the code length N of the (255,139) Reed-Solomon codec255, the maximum number of tolerable errors Ne58, current system L8, N30,
Figure BDA0002278594410000051
above (255,139) the maximum number of errors Reed-Solomon can tolerate, affecting (255,139) the decoding of Reed-Solomon codes, proceeding to step 3 according to step 2. Because the interfered frequency points are the 1 st, 5 th, 9 th, 13 th, 17 th, 21 th, 25 th and 30 th frequency points, the available frequency points occupy more than the total frequency point 2/3, and the available frequency points meet the requirement that any one available frequency point can always meet the requirementAnd finding available frequency points with at least 3 frequency points. Thus, the hopping pattern is considered to be optimized, and the process goes to step 4. Since the signal interference noise ratio of the interfered sub-band is 0dB and is less than the demodulation threshold of the lowest transmission rate of the system by 3.5dB, the system considers the high-power interference and goes to step 5. According to step 5, the system still adopts 16QAM modulation, keeps the current transmission power, transmits on the optimized frequency hopping pattern, and ends.
3. Simulation scene 3;
3.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered subbands of the system is 8, the number of the interfered subbands is 1,5,9,13,17,21,25 and 30, the signal to interference noise ratio of the interfered subbands is 9dB, and the system transmits by a 16QAM (quadrature amplitude modulation) mode and 50W transmission power.
3.2 decision making is specifically realized;
according to the step 1, the demodulation threshold of the transmission waveform of the current system is 13dB, the number L of frequency points lower than the demodulation threshold is 8, and the step 2 is switched to, because the code length N of the (255,139) Reed-Solomon codec255, the maximum number of tolerable errors Ne58, current system L8, N30,
Figure BDA0002278594410000052
above (255,139) the maximum number of errors Reed-Solomon can tolerate, affecting (255,139) the decoding of Reed-Solomon codes, proceeding to step 3 according to step 2. Because the interfered frequency points are the frequency points 1,5,9,13,17,21,25 and 30, the available frequency points occupy more than 2/3 of the total frequency point, and the available frequency points meet the requirement that any one available frequency point can always find the available frequency point with at least 3 frequency points. Thus, the hopping pattern is optimized, going to step 4. Since the signal interference noise ratio of the interfered sub-band is 9dB and is 3.5dB greater than the demodulation threshold of the lowest transmission rate of the system, the system considers that the interference is not high-power interference, and goes to step 6. According to step 6, the system reduces the first-level transmission rate, uses QPSK transmission instead, transmits on the optimized frequency hopping pattern, and ends.
4. Simulation scenario 4
4.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered subbands of the system is 8, the number of the interfered subbands is 1,2,3,4,5,6,7,8,9,10,11,12 and 13, the signal to interference noise ratio of the interfered subbands is-2 dB, and the system transmits by using 100W transmission power in a BPSK modulation mode.
4.2 decision making is specifically realized;
according to the step 1, the demodulation threshold of the transmission waveform of the current system is 3.5dB, the number L of frequency points lower than the demodulation threshold is 13, the step 2 is switched to, and the code length N of the Reed-Solomon code is (255,139)c255, the maximum number of tolerable errors Ne58, current system L13, N30,
Figure BDA0002278594410000061
above (255,139) the maximum number of errors Reed-Solomon can tolerate, affecting (255,139) the decoding of Reed-Solomon codes, proceeding to step 3 according to step 2. The interfered frequency points are the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th and 13 th frequency points, the proportion of the available frequency points occupying the total frequency points is lower than 2/3, and the frequency hopping rule is not met, so the frequency hopping pattern cannot be optimized, and the step 7 is carried out. Since the current transmission rate is already the lowest transmission rate of the system, go to step 8. Go to step 9, since the current transmission power is the current highest transmission power. According to step 9, the system keeps the current transmitting power and transmission rate, and only carries out frequency hopping transmission at the frequency points which are not interfered, namely 14-30 frequency points, and the process is finished.
5. Simulation scenario 5
5.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered subbands of the system is 8, the number of the interfered subbands is 1,2,3,4,5,6,7,8,9,10,11,12 and 13, the signal to interference noise ratio of the interfered subbands is-2 dB, and the system transmits by using a BPSK modulation mode and 50W transmitting power.
5.2 decision specific implementation
According to the step 1, the demodulation threshold of the transmission waveform of the current system is 3.5dB, the number L of frequency points lower than the demodulation threshold is 13, the step 2 is switched to, and the code length N of the Reed-Solomon code is (255,139)c255, the maximum number of tolerable errors Ne58, current system L13, N30,
Figure BDA0002278594410000062
above (255,139) the maximum number of errors Reed-Solomon can tolerate, affecting (255,139) the decoding of Reed-Solomon codes, proceeding to step 3 according to step 2. The interfered frequency points are the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th and 13 th frequency points, the proportion of the available frequency points occupying the total frequency points is lower than 2/3, and the frequency hopping rule is not met, so the frequency hopping pattern cannot be optimized, and the step 7 is carried out. Since the current transmission rate is already the lowest transmission rate of the system, go to step 8. Go to step 10, since the current transmission power is not the current highest transmission power. According to step 10, the system keeps the current transmission rate, increases the transmission power to 100W, transmits in the current frequency hopping pattern, and ends.
6. Simulation scenario 6
6.1 simulation scene description;
the system adopts (255,139) Reed-Solomon code coding, has 3 modulation modes in total of BPSK, QPSK and 16QAM, and each symbol occupies one frequency hopping sub-band, and 30 sub-bands in total. The number of the interfered subbands of the system is 13, the number of the interfered subbands is 1,2,3,4,5,6,7,8,9,10,11,12 and 13, the signal interference noise ratio of the interfered subbands is 4dB, and the system transmits by a 16QAM (quadrature amplitude modulation) mode and 50W transmitting power.
6.2 decision specific implementation
According to the step 1, the demodulation threshold of the transmission waveform of the current system is 3.5dB, the number L of frequency points lower than the demodulation threshold is 13, the step 2 is switched to, and the code length N of the Reed-Solomon code is (255,139)c255, the maximum number of tolerable errors Ne58, current system L13, N30,
Figure BDA0002278594410000071
above (255,139) the maximum number of errors Reed-Solomon can tolerate, affecting (255,139) the decoding of Reed-Solomon codes, proceeding to step 3 according to step 2. The interfered frequency points are the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th, 9 th, 10 th, 11 th, 12 th and 13 th frequency points, the proportion of the available frequency points occupying the total frequency points is lower than 2/3, and the frequency hopping rule is not met, so the frequency hopping pattern cannot be optimized, and the step 7 is carried out. Since the current transmission rate is not the lowest transmission rate of the system, go to step 11. According to step 11, the system keeps the transmission power and the frequency hopping pattern, reduces the rate to BPSK modulation to meet the system requirements for transmission, and ends.

Claims (2)

1. A method for determining a communication mode in a frequency hopping communication system, comprising the steps of:
step 1, calculating the SINR of all N transmission frequency points according to the result of spectrum sensingi，i∈[1，N]Counting the number L of frequency points with the signal-to-interference-and-noise ratio lower than the judgment threshold of the current transmission waveform;
step 2, judging L multiplied by NcWhether N is higher than the maximum error number N tolerable by the channel coding adopted by the current system waveformeIn which N iscIf the code length is the code length, entering the next step, otherwise, ending;
step 3, judging whether the available frequency points accord with the frequency hopping rule of the system, namely whether the frequency hopping pattern can be optimized, wherein the optimized frequency hopping pattern refers to the frequency hopping pattern which avoids the interfered frequency points and accords with the frequency hopping rule of the system, if the frequency hopping pattern can be optimized, turning to the step 4, otherwise, turning to the step 7; the frequency hopping rules of the frequency hopping systems are different, and the frequency hopping rules comprise the bandwidth required to be spaced between two adjacent hops and the bandwidth factor occupied by the frequency hopping systems;
step 4, judging whether the interfered frequency point is high-power interference, if so, turning to step 5, otherwise, turning to step 6;
step 5, transmitting at the current transmission rate by using the current transmission power and the optimized frequency hopping pattern, and ending;
step 6, reducing the first-level transmission rate, transmitting on the optimized frequency hopping pattern at the current transmission rate and power, and ending; the first-stage transmission rate reduction means that the demodulation transmission waveform decision threshold is lower than the current transmission rate waveform by one stage;
step 7, judging whether the current rate is the lowest transmission rate, if so, turning to step 8, otherwise, turning to step 11;
step 8, judging whether the current transmitting power is the maximum transmitting power of the system, if so, turning to step 9, otherwise, turning to step 10;
step 9, keeping the current transmission rate and the transmission power, transmitting only at the frequency points which are not interfered, and ending;
step 10, maintaining the current rate, increasing the transmission power to transmit in the current frequency hopping pattern, and ending;
and step 11, reducing the transmission rate until the system communication requirement is met, transmitting by using the current transmission power and the frequency hopping pattern, and ending.
2. The method of claim 1, wherein the method comprises:
the high power interference finger in step 4 cannot demodulate correctly at the lowest transmission rate.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106656372A (en) * 2016-12-12 2017-05-10 西安空间无线电技术研究所 Frequency band interference detection method for frequency hopping system
CN107294640A (en) * 2017-05-11 2017-10-24 中国电子科技集团公司第二十研究所 Based on it is cognitive lead to, disturb, anti-integrated control method
CN107370502A (en) * 2017-07-20 2017-11-21 西安空间无线电技术研究所 A kind of anti-strong arrowband interference method based on spectral line processing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106656372A (en) * 2016-12-12 2017-05-10 西安空间无线电技术研究所 Frequency band interference detection method for frequency hopping system
CN107294640A (en) * 2017-05-11 2017-10-24 中国电子科技集团公司第二十研究所 Based on it is cognitive lead to, disturb, anti-integrated control method
CN107370502A (en) * 2017-07-20 2017-11-21 西安空间无线电技术研究所 A kind of anti-strong arrowband interference method based on spectral line processing

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