Missile communication data transmission method with adaptive sensitivity adjustment

Abstract

The present invention proposes a missile communication data transmission method with adaptive sensitivity adjustment, which calculates the channel capacity C by acquiring the real-time channel state information CSI and the noise power spectrum density PSD of the missile communication system; according to the calculated channel capacity, the data transmission rate is adaptively adjusted, the optimal modulation order is calculated based on the current signal-to-noise ratio and the target bit error rate, and the receiver sensitivity is dynamically adjusted by using an adaptive sensitivity adjustment algorithm; data transmission is performed according to the adjusted data transmission rate, modulation order and receiver sensitivity. The method significantly improves the anti-interference capability and communication reliability of the missile communication system, provides key technical support for the precise guidance and real-time control of the missile, and ensures that the communication efficiency meets actual needs.

Description

Technical Field

[0001] The invention belongs to the technical field of communication data transmission, and in particular relates to a missile communication data transmission method with adaptive sensitivity adjustment. Background Art

[0002] In modern missile systems, the reliability and efficiency of communication data transmission are crucial. During the flight of missiles, due to high-speed movement, complex environment and possible enemy interference, their communication systems face huge challenges. Traditional missile communication data transmission methods often use fixed parameter settings, such as fixed data transmission rate, modulation order, receiver sensitivity and coding rate. This fixed parameter method may perform well in static or less variable environments, but its performance will be seriously affected in the dynamic and high-interference environment where the missile is located.

[0003] In the prior art, the use of fixed data transmission rate and modulation order cannot fully utilize channel resources, or leads to an increase in data transmission error rate when channel conditions deteriorate. Traditional receiver sensitivity settings are often based on static environments or average channel conditions, but in actual use, due to changes in channel conditions, fixed receiver sensitivity may not be able to adapt to all situations, resulting in the inability to fully utilize signal strength when channel conditions are good, or the inability to accurately receive signals when channel conditions are poor. In addition, parameters such as the coding rate and interleaving depth of the missile communication system also have an important impact on data transmission performance. The coding rate determines the redundancy of data transmission, while the interleaving depth affects the delay and anti-interference ability of data transmission. In a dynamic environment, if the coding rate and interleaving depth are set improperly, it may lead to reduced data transmission efficiency or increased error rate.

[0004] However, most of the existing missile communication systems lack such an adaptive adjustment mechanism, or their adaptive adjustment algorithms are relatively simple and cannot accurately reflect changes in channel states, resulting in poor adjustment effects. Therefore, developing a missile communication data transmission method with adaptive sensitivity adjustment is of great significance for improving the performance of missile communication systems. Summary of the invention

[0005] The present invention provides a missile communication data transmission method with adaptive sensitivity adjustment, which aims to obtain channel state information (CSI) and noise power spectral density (PSD), and calculate the channel capacity based on this, so as to dynamically adjust key communication parameters such as data transmission rate, modulation order and receiver sensitivity, so as to ensure that the missile can still maintain efficient and reliable communication data transmission in a complex environment.

[0006] The scheme of the present invention is as follows:

[0007] A missile communication data transmission method with adaptive sensitivity adjustment, the method comprising the following steps:

[0008] Step S1, obtain the real-time channel state information CSI and noise power spectrum density PSD of the missile communication system, and calculate the channel capacity .

[0009] ;

[0010] in, is the channel bandwidth, is the transmission power, is the channel gain, is the noise power spectral density.

[0011] Step S2, according to the calculated channel capacity, the data transmission rate is adaptively adjusted, the optimal modulation order is calculated based on the current signal-to-noise ratio and the target bit error rate, and the receiver sensitivity is dynamically adjusted using an adaptive sensitivity adjustment algorithm.

[0012] ;

[0013] ;

[0014] ;

[0015] in, is the data transmission rate, is the adaptive factor, is the target signal-to-noise ratio, is the target bit error rate, is the current bit error rate, M is the optimal modulation order, is the receiver sensitivity, is the initial sensitivity, is the adjustment factor, .

[0016] Step S3, performing data transmission according to the adjusted data transmission rate, modulation order and receiver sensitivity.

[0017] Furthermore, the transmit power is calculated by using the initial transmit power and the current signal-to-noise ratio:

[0018]

[0019] in, is the initial transmission power, is the current signal-to-noise ratio.

[0020] Furthermore, the method further includes dynamically adjusting the coding rate based on the current channel condition, and performing data transmission according to the adjusted coding rate;

[0021]

[0022] in is the adjusted coding rate, and are the current minimum and maximum coding rates respectively, and λ is the coding rate adjustment coefficient;

[0023] Calculate the effective data transmission rate of the system based on the adjusted coding rate :

[0024]

[0025] The coding gain of the system is and the overall system signal-to-noise ratio Respectively expressed as: , .

[0026] Furthermore, the method also includes dynamically adjusting the interleaving depth based on the current channel conditions. :

[0027]

[0028] in, is the initial interleaving depth, according to the interleaving depth Calculate the delay introduced by interleaving :

[0029]

[0030] The overall system delay : ,in, is the propagation delay, To handle delay;

[0031] The system throughput : ,in, The size of the data packet transmitted.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention obtains channel state information and noise power spectrum density in real time and calculates channel capacity accordingly. The present invention can dynamically adjust key communication parameters such as data transmission rate, modulation order and receiver sensitivity, thereby ensuring that the missile communication system can maintain efficient and reliable data transmission in a complex and changeable channel environment, thereby enhancing the adaptability and robustness of the system. At the same time, the method also has high versatility and can be widely used in various communication scenarios and needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a flow chart of the missile communication data transmission method with adaptive sensitivity adjustment of the present invention. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] like Figure 1 As shown, it is a flow chart of the missile communication data transmission method with adaptive sensitivity adjustment of the present invention, and the method comprises the following steps: The missile communication data transmission method with adaptive sensitivity adjustment, the method comprises the following steps:

[0039] Step S1, obtain the real-time channel state information CSI and noise power spectrum density PSD of the missile communication system, and calculate the channel capacity .

[0040] Through the channel estimation module in the missile communication system, we can obtain real-time channel state information, which describes the channel characteristics experienced by the signal during transmission, including channel gain, phase offset, multipath effect, etc. CSI is crucial for optimizing data transmission because it provides real-time information about channel quality and can be used to adjust transmission parameters to improve performance; noise power spectral density describes the noise power per unit frequency bandwidth and is a key indicator for measuring channel noise level.

[0041] Channel capacity is the maximum amount of information that a channel can reliably transmit under a given noise level. As shown in the following formula, the theoretical maximum capacity of the current channel is calculated based on the Shannon capacity formula. Channel capacity is related to channel bandwidth, transmit power, channel gain, and noise power spectral density, and it determines the upper limit of the data transmission rate.

[0042] ;

[0043] in, is the channel bandwidth, is the transmission power, is the channel gain, The noise power spectral density is the noise power spectral density, and a noise estimation algorithm, such as the minimum mean square error (MMSE) method, is used to estimate the noise power spectral density of the current channel.

[0044] Step S2, according to the calculated channel capacity, the data transmission rate is adaptively adjusted, the optimal modulation order is calculated based on the current signal-to-noise ratio and the target bit error rate, and the receiver sensitivity is dynamically adjusted using an adaptive sensitivity adjustment algorithm.

[0045] ;

[0046] ;

[0047] ;

[0048] in, is the data transmission rate, is the adaptive factor, is the target signal-to-noise ratio, is the target bit error rate, is the current bit error rate, M is the optimal modulation order, is the receiver sensitivity, is the initial sensitivity, is the adjustment factor, .

[0049] According to the calculated M value, select the corresponding modulation mode, for example, set M = 2: BPSK; - M = 4: QPSK; M = 8: 8PSK; M = 16: 16QAM; M = 64: 64QAM, etc.

[0050] Step S3, performing data transmission according to the adjusted data transmission rate, modulation order and receiver sensitivity.

[0051] The transmit power is calculated by the initial transmit power and the current signal-to-noise ratio:

[0052]

[0053] in, is the initial transmission power, is the current signal-to-noise ratio.

[0054] The method further includes dynamically adjusting the coding rate based on the current channel condition, and performing data transmission according to the adjusted coding rate;

[0055]

[0056] in is the adjusted coding rate, and are the current minimum and maximum coding rates respectively, and λ is the coding rate adjustment coefficient;

[0057] Calculate the effective data transmission rate of the system based on the adjusted coding rate :

[0058]

[0059] The coding gain of the system is and the overall system signal-to-noise ratio Respectively expressed as: , .

[0060] The method also includes dynamically adjusting the interleaving depth based on current channel conditions :

[0061]

[0062] in, is the initial interleaving depth, according to the interleaving depth Calculate the delay introduced by interleaving :

[0063]

[0064] The overall system delay : ,in, is the propagation delay, To handle delay;

[0065] The system throughput : ,in, The size of the data packet transmitted.

[0066] In addition, this embodiment discloses a corresponding algorithm flow for implementing the above-mentioned adaptive adjustment method:

[0067] 1. Initialize system parameters (initial transmit power, initial sensitivity, initial coding rate, etc.);

[0068] 2. Obtain real-time channel state information (CSI) and noise power spectral density (PSD);

[0069] 3. Calculate the current channel capacity;

[0070] 4. Adjust the data transmission rate;

[0071] 5. Select the optimal modulation method;

[0072] 6. Adjust the receiver sensitivity;

[0073] 7. Adjust the transmit power;

[0074] 8. Adjust the encoding rate;

[0075] 9. Adjust the interweaving depth;

[0076] 10. Calculate the overall system latency and throughput;

[0077] 11. Perform data transfer;

[0078] 12. Obtain performance feedback (such as BER, SNR, etc.);

[0079] 13. Return to algorithm process 2 for the next round of adjustments.

[0080] In order to better understand the missile communication data transmission method with adaptive sensitivity adjustment, this embodiment provides a specific application example.

[0081] Suppose there is a medium-range missile communication system that needs to maintain stable and reliable communication in a complex electromagnetic environment. The flight time of the missile from launch to target is about 300 seconds. During this process, the missile needs to continuously exchange data with the ground control station, including position information, target updates and telemetry data. In order to ensure the stability and reliability of communication, we adopted a missile communication data transmission method with adaptive sensitivity adjustment; the initial parameters are set as: initial transmit power P0 = 10 W, channel bandwidth B = 5 MHz, initial receiver sensitivity S0 = -100 dBm, initial coding rate r0 = 0.75, initial interleaving depth D0 = 1000 bits, target bit error rate BER = 10^-6, target signal-to-noise ratio SN = 15dB, data packet size L = 1000 bytes.

[0082] Missile launch phase (0-50 seconds): When the missile is just launched, due to its close distance to the ground, the electromagnetic interference is relatively small and the channel quality is good; the channel capacity C is calculated based on the real-time channel state information (CSI) and noise power spectral density (PSD); based on the channel capacity C, the data transmission rate R is adaptively adjusted, and the optimal modulation method (such as BPSK or QPSK) is selected; the receiver sensitivity S is adjusted to ensure the quality of the received signal; according to the current signal-to-noise ratio SNR(t), the transmission power P is adjusted; the coding rate r is dynamically adjusted to ensure the reliability of data transmission; according to the coding rate r, the interleaving depth D is adjusted to reduce the bit error rate; the overall system delay Ttal and throughput Th are calculated to ensure communication efficiency.

[0083] Missile mid-flight stage (50-200 seconds): When the missile enters the mid-flight stage, it is far from the ground, electromagnetic interference increases, and channel quality decreases; CSI and PSD are acquired and updated in real time, and the channel capacity C is recalculated; according to the new channel capacity, the data transmission rate R, modulation mode, receiver sensitivity S, transmission power P, coding rate r and interleaving depth D are adaptively adjusted again; due to the degradation of channel quality, it may be necessary to reduce the data transmission rate, increase the modulation order (such as switching from BPSK to QPSK or higher-order modulation modes) and increase the transmission power to ensure the reliability of data transmission; at the same time, according to the adjusted coding rate r, the interleaving depth D is recalculated to reduce the bit error rate; the overall system delay T tal and throughput Th are monitored and adjusted to ensure that the communication efficiency meets the requirements.

[0084] The missile approaches the target stage (200-300 seconds): As the missile approaches the target, electromagnetic interference may further increase and the channel quality may further deteriorate; CSI and PSD are updated in real time, and the channel capacity C is recalculated; according to the new channel capacity, the data transmission rate R, modulation mode, receiver sensitivity S, transmission power P, coding rate r and interleaving depth D are adaptively adjusted again; at this stage, it is necessary to further reduce the data transmission rate, increase the modulation order and transmission power to ensure the reliability of data transmission.

[0085] During the entire flight, the missile communication system can maintain stable and reliable communication by acquiring channel state information and noise power spectrum density in real time and adaptively adjusting parameters such as data transmission rate, modulation mode, receiver sensitivity, transmission power, coding rate and interleaving depth. At the same time, by monitoring and adjusting performance indicators such as the overall system delay and throughput, it can ensure that the communication efficiency meets the data exchange requirements between the missile and the target. In practical applications, this missile communication data transmission method with adaptive sensitivity adjustment will significantly improve the anti-interference capability and communication reliability of the missile communication system.

[0086] It should be noted that those skilled in the art should understand that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of the present invention.

Claims

1. A missile communication data transmission method with adaptive sensitivity adjustment, characterized in that: The method comprises the following steps: Step S1, obtain the real-time channel state information CSI and noise power spectrum density PSD of the missile communication system, and calculate the channel capacity ; ; in, is the channel bandwidth, is the transmission power, is the channel gain, is the noise power spectral density; Step S2, adaptively adjusting the data transmission rate according to the calculated channel capacity, calculating the optimal modulation order based on the current signal-to-noise ratio and the target bit error rate, and dynamically adjusting the receiver sensitivity using an adaptive sensitivity adjustment algorithm; ; ; ; in, is the data transmission rate, is the adaptive factor, is the target signal-to-noise ratio, is the target bit error rate, is the current bit error rate, M is the optimal modulation order, is the receiver sensitivity, is the initial sensitivity, is the adjustment factor, ; Step S3, data transmission according to the adjusted data transmission rate, modulation order and receiver sensitivity; The method further includes dynamically adjusting the coding rate based on the current channel condition, and performing data transmission according to the adjusted coding rate; ; in is the adjusted coding rate, and are the current minimum and maximum coding rates respectively, and λ is the coding rate adjustment coefficient; Calculate the effective data transmission rate of the system based on the adjusted coding rate : ; The coding gain of the system is and the overall system signal-to-noise ratio Respectively expressed as: , ; The method also includes dynamically adjusting the interleaving depth based on current channel conditions : ; in, is the initial interleaving depth, according to the interleaving depth Calculate the delay introduced by interleaving : ; The overall system delay : ,in, is the propagation delay, To handle delay; The system throughput : ,in, The size of the data packet transmitted.

2. The missile communication data transmission method with adaptive sensitivity adjustment according to claim 1 is characterized in that: The transmit power is calculated by the initial transmit power and the current signal-to-noise ratio: ; in, is the initial transmission power, is the current signal-to-noise ratio.

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