An adaptive frame structure generation method for multi-scenario broadband satellite communications

Abstract

The present invention discloses a method for generating an adaptive and flexible frame structure for complex multi-scenario broadband satellite communication transmission, and belongs to the field of satellite communication technology. The present invention includes adaptively adjusting the length of the leading information according to the satellite position, speed and channel conditions to generate the leading information; selecting whether there is signaling according to the communication mode, and creating signaling information after the leading information if there is signaling; multiplexing the data information after the frame information, and inserting a scattered pilot into the data information, and the insertion frequency of the scattered pilot is determined according to the satellite motion situation, dynamic channel characteristics, platform motion state and speed parameters. The frame structure generated by the present invention can meet the requirements of complex communication scenarios, multi-mode communication, and large-span rate, and can achieve compatibility with high, medium and low orbit satellites and multiple platform communications. It has the advantages of flexibility, high efficiency and versatility, and improves the transmission performance and reliability of various communication systems.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a method for generating an adaptive and flexible frame structure for complex multi-scenario broadband satellite communication transmission. Background Art

[0002] In the communication system, frame structure design is a key technology that directly affects the transmission efficiency and reliability of the system. The traditional frame structure is designed for specific communication environments and needs. Among them, the fixed-point channel state of high-orbit satellites is stable but is affected by white noise and rain attenuation, so the frame structure is required to have strong anti-interference and dynamic adaptability to channel changes; low-orbit satellite mobile communications will have satellite switching, so Doppler and frequency changes and level changes will occur during the communication process, so the frame structure design needs to pay more attention to the characteristics of fast switching and frequent channel changes; high-mobility platforms are fast and flexible, and Doppler frequency shift and Doppler change rate will change significantly. Slow-moving platforms move relatively slowly, and Doppler frequency shift and Doppler change rate will change slightly during the communication process, so there are certain requirements for the frequency of occurrence of tracking pilots in the frame structure.

[0003] In summary, due to the differences in high, medium and low orbit satellite systems, different loading platforms and different channel parameters, the requirements for the anti-Doppler performance and tracking performance of the frame structure are inconsistent. Fixed frame structures are difficult to meet the high reliability and efficient transmission requirements of different platforms and different communication scenarios, resulting in the need to redesign the frame structure to meet the needs of different channel conditions when the equipment is used in different satellite systems or installed on different loading platforms. In view of the complex scenarios such as the need to switch between high and low orbit systems and multi-platform applications during the application of satellite communication equipment, a highly reliable, efficient and flexible frame structure generation method is needed to meet different communication needs and improve the adaptability and performance of the system. Summary of the invention

[0004] The purpose of the present invention is to provide a method for generating an adaptive and flexible frame structure for complex multi-scenario broadband satellite communication transmission in view of the shortcomings of the above-mentioned background technology. The present invention can achieve compatibility with high, medium and low orbit satellites and multi-platform communications, can meet the requirements of complex communication scenarios, multi-mode communications, and large-span rates, and provide an efficient frame structure generation method for different application scenarios, thereby improving the transmission performance and reliability of each communication system.

[0005] The object of the present invention is achieved in that:

[0006] The method for generating an adaptive and flexible frame structure for complex multi-scenario broadband satellite communication transmission includes the following steps:

[0007] Step 1, adaptively adjusting the length of the preamble information according to the satellite position, speed and channel conditions to generate the preamble information;

[0008] Step 2, selecting whether to have signaling according to the communication mode, wherein when the communication mode is FDMA continuous mode and CDMA continuous mode, no signaling information is added, and when the communication mode is TDMA mode, FDMA burst mode and CDMA burst mode, signaling information is created after the leading information, and the signaling information includes communication mode, power control, modulation and coding mode, symbol rate, platform speed and movement direction;

[0009] Step 3, multiplex the data information after the frame information after step 2, and insert scattered pilots into the data information. The insertion frequency of the scattered pilots is determined according to the satellite motion conditions, dynamic channel characteristics, platform motion status and speed parameters.

[0010] Furthermore, in step 1, the leading information length is calculated as follows:

[0011]

[0012] in, is the relative speed, c is the speed of light, is the working frequency, is the signal-to-noise ratio of the leader, is a constant value of 1024. is the required capture probability, is the inverse function of the Q function of the capture probability, is the symbol rate.

[0013] Furthermore, in step 3, the scattered pilots adopt an adaptive insertion strategy, and the insertion frequency of the scattered pilots is calculated as follows:

[0014]

[0015] in, is the relative motion acceleration, is the signal-to-noise ratio of the scattered pilot, where , is a constant value of 15, is the speed of light, is the working frequency.

[0016] Compared with the background technology, the present invention has the following advantages:

[0017] 1. Flexibility: The generation and insertion methods of preamble information, signaling information and scattered pilots are flexible and diverse, and can be flexibly selected according to different communication requirements and environments to improve the adaptability and flexibility of the system.

[0018] 2. High efficiency: The length of the preamble information, the selection of signaling information and the insertion frequency of the scattered pilots are all optimized to maximize data transmission efficiency while ensuring communication quality.

[0019] 3. Versatility: The present invention is applicable to a variety of communication systems and platforms, including high, medium and low orbit satellite communications, ground communications, etc., and has strong versatility and scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flowchart of a method for generating an adaptive and flexible frame structure for complex multi-scenario broadband satellite communication transmission in an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the basic composition of the frame structure in an embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the relationship between satellite and platform parameters and frame structure in an embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the fast capture and tracking capture principle of the frame structure generated in the embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in further detail below.

[0025] Complex multi-scenario broadband satellite communication transmission adaptive flexible frame structure generation method, such as Figure 1 As shown, the following steps are included:

[0026] (1) Generate flexible preamble information: Preamble information is used to achieve symbol synchronization and frame synchronization in communication systems. The key is to balance the capture probability and the length of the preamble information. According to the relationship between the capture probability and the signal-to-noise ratio, the length of the preamble information can be determined so that the system can accurately capture synchronization under different signal-to-noise ratio conditions.

[0027] This method adaptively adjusts the length of the preamble information, and dynamically adjusts the length of the preamble information according to the satellite speed and channel conditions to ensure synchronization performance in high-speed motion scenarios.

[0028] When the receiving end is capturing, the capture parameters can be changed and configured at any time. The capture module can be configured according to the received parameters to make the capture module adapt to different capture lengths corresponding to various satellites and platforms.

[0029] (2) The signaling is selected based on the communication mode. When the communication mode is FDMA continuous mode and CDMA continuous mode, no signaling information is added. When the communication mode is TDMA mode, FDMA burst mode and CDMA burst mode, signaling information is created after the preamble information. The signaling information includes parameters such as communication mode (such as single carrier communication, OFDM, etc.), modulation and coding mode (such as QPSK, 16QAM, etc.), and symbol rate. By flexibly selecting different communication modes and modulation and coding modes, it can adapt to different communication needs and environments, thereby improving the flexibility and applicability of the system.

[0030] This method uses a fast signaling update method to quickly update and adjust the signaling information to adapt to channel changes under high-speed mobile conditions. In addition, according to the feedback information from the receiving end and the channel status, the content and parameters of the signaling information are dynamically adjusted to adapt to different communication environments and scenarios.

[0031] (3) Flexible insertion of scattered pilots: Scattered pilots are used for frequency offset estimation and channel estimation, which are particularly important in high dynamic conditions. Scattered pilots use an adaptive insertion strategy, and the insertion frequency of scattered pilots must take into account the communication rate and the size of the high dynamic range to ensure that the system can effectively track the signal and achieve stable communication.

[0032] Figure 2 The basic composition of the frame structure generated according to the above steps mainly includes three parts: preamble information, signaling information and data information.

[0033] Figure 3 It is the relationship between satellite and platform parameters and frame structure, where the length of the leading information is calculated as follows:

[0034]

[0035] in, is the relative speed, c is the speed of light, is the working frequency, is the signal-to-noise ratio of the leader, is a constant value of 1024. is the required capture probability, is the inverse function of the Q (Marcumq) function of the capture probability, is the symbol rate.

[0036] The insertion frequency of the scattered pilot is calculated as follows:

[0037]

[0038] in, is the relative motion acceleration, is the signal-to-noise ratio of the scattered pilot, where , is a constant value of 15, is the speed of light, is the working frequency.

[0039] like Figure 4 As shown, the receiving end processes the above frame structure as follows:

[0040] After the receiver receives the signal, it first performs filtering and integer multiple sampling processing, where the sampling multiple is generally required to be greater than 2 times and less than 8 times, and then capture is performed. The capture length is configured according to the maximum length of the preamble, and then related operations are performed with the predicted preamble. After the capture is completed, it is determined whether there is signaling based on the communication mode. If there is signaling, the signaling parameter information in the received signal is parsed according to the signaling protocol, and the distribution of scattered pilots in the frame structure is obtained, that is, the frequency of scattered pilots. If there is no signaling, this step is skipped directly for subsequent processing, and the frequency of scattered pilots is the default value. Then the scattered pilots are extracted, and the carrier tracking is performed with the scattered pilots as input to complete the carrier synchronization of the data information.

[0041] This method uses an adaptive scattered pilot insertion strategy based on the satellite motion trajectory and the dynamic channel characteristics of the receiving end to achieve high dynamic range tracking and channel estimation of the signal. According to the platform motion state and speed changes, the insertion position and frequency of the scattered pilot are adjusted in real time to improve the adaptability and performance of the communication system.

[0042] The frame structure generated by this method includes flexible preamble information, signaling information and scattered pilots. The length of the preamble information is determined according to the capture performance and channel characteristics, and the preamble length is adjusted according to the position and motion parameters of high, medium and low orbit satellites. The signaling information includes the communication mode, modulation and coding mode, symbol rate, etc., and the signaling can be selected or the signaling length can be flexibly adjusted according to the TDMA mode, CDMA mode or FDMA mode to meet different needs. The insertion frequency of the scattered pilot is determined according to the communication rate and the size of the high dynamics to achieve effective tracking of the signal under high dynamic conditions.

[0043] In summary, the present invention provides corresponding calculation formulas and algorithms, so that the generated frame structure can meet the requirements of complex communication scenarios, multi-mode communication, and large-span rate, and can achieve compatibility of high, medium and low orbit satellites and multiple platform communications. It has the advantages of flexibility, high efficiency and versatility, and achieves compatibility of high, medium and low orbit satellites and multi-application platform communications. The present invention can provide an efficient frame structure for different application scenarios, improve the transmission performance and reliability of each communication system, and provide new ideas and solutions for performance improvement and application expansion of communication systems.

[0044] The contents not described in detail in this specification are known contents in the art.

[0045] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent replacement or change made by a person skilled in the art based on the technical solution and inventive concept of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for generating an adaptive frame structure for multi-scenario broadband satellite communication, characterized in that: The following steps are involved: Step 1: Adaptively adjust the preamble length according to the satellite position, speed and channel conditions to generate the preamble. The calculation method of the preamble length is as follows: in, is the relative speed, c is the speed of light, is the working frequency, is the signal-to-noise ratio of the leader, is a constant value of 1024. is the required capture probability, is the inverse function of the Q function of the capture probability, is the symbol rate; Step 2, selecting whether to have signaling according to the communication mode, wherein when the communication mode is FDMA continuous mode and CDMA continuous mode, no signaling information is added, and when the communication mode is TDMA mode, FDMA burst mode and CDMA burst mode, signaling information is created after the leading information, and the signaling information includes communication mode, power control, modulation and coding mode, symbol rate, platform speed and movement direction; Step 3, multiplex the data information after the frame information after step 2, and insert the scattered pilot into the data information. The insertion frequency of the scattered pilot is determined according to the satellite motion situation, dynamic channel characteristics, platform motion state and speed parameters; wherein the scattered pilot adopts an adaptive insertion strategy, and the insertion frequency of the scattered pilot is calculated as follows: in, is the relative motion acceleration, is the signal-to-noise ratio of the scattered pilot, where , is a constant value of 15, is the speed of light, is the working frequency.

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