Communication method and device for improving spectrum efficiency in low earth orbit satellite communication system

Abstract

The invention relates to the field of satellite communication, in particular to a communication method and a device for improving spectrum efficiency in a low-orbit satellite communication system. The method comprises the following steps: selecting a plurality of groups of pseudorandom sequences with autocorrelation according to the length of pilot frequency; respectively identifying a control channel and a service channel by using pseudorandom sequences of different groups, and mapping the control channel and the service channel to the same physical layer burst; testing corresponding system bit error rates when the pseudorandom sequences of different groups carry out data transmission in different placement modes in a physical frame structure, and selecting the placement mode with a lower bit error rate as a placement mode of pilot frequencies in the frame structure; and measuring the channel quality by using the placed pilot frequency sequence, and adaptively adjusting the data transmission rate according to the measurement result. According to the method, three aspects of pilot frequency design, multiplexing of the service channel and the control channel and link control are considered respectively, so that the spectrum efficiency in the low-orbit satellite communication system is effectively improved.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a communication method and device for improving spectrum efficiency in a low-orbit satellite communication system. Background technique [0002] In recent years, with the advancement of information processing technology, satellite communication technology has developed rapidly. Satellite communication not only plays an important role in military tasks, but also has a major impact on people's daily production and life. Compared with ground communication, the advantages of satellite communication are mainly reflected in the following aspects: [0003] (1) Satellite communication is not restricted by terrain and landforms, and can achieve full coverage of signals, which can effectively meet the networking needs of oceans, remote lands, alpine forests, deserts and other areas; [0004] (2) Satellite communication is robust. Because the satellite is far away from the ground, c...

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Problems solved by technology

[0007] In the low-orbit satellite communication system, it is necessary to measure and monitor the channel to ensure stable communication transmission; in the prior art, the method of sending pilot frequency is often used to identify the channel type, and the pilot signal is generally a single frequency, which can be used for software Handover, cell selection, open-loop power control, etc., and generally, pilots need to be inserted in the frame structure design, but such pilots cannot realize link control and channel type distinction, and cannot improve the spectral efficiency of the system

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