6 results about "Satellite mobile communication" patented technology

The application discloses a satellite switching coordination prediction method for interference avoidance, and relates to the technical field of satellite mobile communication.The application comprises the following steps: after receiving the interference avoidance instruction of a ground network control center, a service satellite precalculates a differentiated switching advance for a terminal according to the antenna type and service quality level of the terminal; then, the inter-satellite link is used to acquire the predicted coverage time window and load state of a neighboring satellite for the area where the satellite terminal is located, and a comprehensive score is obtained; and finally, at the switching trigger moment, the satellite terminal is switched to the neighboring satellite with the highest comprehensive score, so that the target satellite can provide continuous and stable service in the subsequent period of time, and the risk of'secondary switching' caused by the subsequent interference avoidance of the target satellite is effectively avoided.The application significantly improves the continuity of high-priority services and the overall resource utilization efficiency of the system by deeply coordinating the management of the interference avoidance plan and the switching mechanism.

The application is a satellite 5G large dynamic high-speed transmission real-time receiving and time synchronization method and system based on FPGA, and belongs to the technical field of wireless communication.The system is provided with a real-time receiving module, a time synchronization module and the like at the receiving end of a satellite-ground transmission link.The method comprises the following steps: the receiving end stores data into a DDR3 in real time by using an asynchronous FIFO, and performs time synchronization once every transmission half-frame signal;the starting point of a symbol is calculated in a multi-symbol combination mode, the content of each symbol is obtained according to the starting point of the symbol, a correlation value is calculated according to a known PSS sequence, the starting point of the half-frame signal is obtained, and subsequent CP removal and demodulation operations are continuously performed;the application solves the problem of timing synchronization difficulty caused by large time delay and large frequency offset, realizes low complexity and timing synchronization error not affected by carrier frequency offset under the premise of ensuring accuracy, and can be used for the time synchronization process of a satellite mobile communication system with large dynamic frequency offset.

The application provides a multi-user cooperative communication system and method based on satellite mobile communication. The system comprises: a gateway station receiving various types of information sent by corresponding user terminals through satellite mobile communication connection and sending the information to an information transmission service module; the information transmission service module sending the information to a multi-user cooperative communication service module; sending a service request to the multi-user cooperative communication service module; the multi-user cooperative communication service module receiving the information; sending corresponding information to corresponding user terminals according to the service request; the user terminals sending various types of information and service requests to the gateway station, receiving service information fed back by the multi-user cooperative communication service module through the gateway station and forwarding the service information to other user terminals in corresponding groups; and a data monitoring center monitoring and obtaining the information received by the multi-user cooperative communication service module and the service information fed back. The system can adapt to various scenes and meet efficient communication among user groups in a small range.

The present application relates to a kind of low-orbit satellite switching methods based on double activation protocol stack, belong to satellite mobile communication technical field.The method includes: in low-orbit satellite network environment, design with the average rate of user equipment maximization and the switching interruption delay minimization as optimization target's switching architecture based on double activation protocol stack, and establish original optimization problem;Establish low-orbit satellite network multi-stage switching mechanism;Based on the multi-stage switching mechanism established, original optimization problem is decomposed into bandwidth allocation sub-problem and switching strategy sub-problem;Bandwidth allocation sub-problem is solved using alternate direction multiplier method;Switching strategy sub-problem is solved using simulated annealing algorithm;The final optimal solution is obtained by combining the solving results of bandwidth allocation sub-problem and switching strategy sub-problem.The present application can effectively deal with the challenge of frequent satellite switching and limited satellite resources in satellite network, while realizing high-speed, seamless connection, and improving user experience.

The application provides a beam switching method, device and satellite mobile communication system, wherein a satellite terminal in the satellite mobile communication system has a first service communication module and a second service communication module. In the case that the first service communication module of the satellite terminal establishes a first service channel with an access network based on a first beam, if the satellite terminal detects that the satellite terminal is in a beam overlapping area of multiple beams, a second beam to be switched to is determined from the multiple beams; a second service channel is established with the access network based on the second beam through the second service communication module, and if the satellite terminal confirms that the second service channel has been successfully established, the first service channel between the first service communication module and the access network is released. The scheme of the application can improve the beam switching success rate.

This invention relates to the field of multi-carrier communication systems and proposes a blind RS detection method based on the similarity of adjacent subcarriers. It aims to solve the problem of high network signaling overhead caused by high-frequency RS signal transmission in dense, large-scale constellation scenarios, eliminating the need to rely on higher-layer signaling and dynamic control signaling to indicate the RS signal pattern. The method first obtains the estimated frequency response sequence of the subcarrier channel corresponding to the RS symbol. Then, through N parallel processing units, it performs differential, modulus-square, and accumulation operations on the N RS patterns supported by the system to obtain the frequency response differential power sum of each pattern. Finally, it retrieves the branch corresponding to the minimum value, and the associated RS pattern is the detection result. This invention designs two implementation schemes: parallel accumulation and sequential accumulation. The former improves detection efficiency, while the latter has low logic resource consumption and is easy to implement in hardware. It is applicable to various multi-carrier systems such as cellular mobile communication, satellite mobile communication, and non-terrestrial network communication.