He Yizhou
Beijing University of Posts and Telecommunications, China
Posters-Accepted Abstracts: J Aeronaut Aerospace Eng
Because of the integration of long term evolution (LTE) technology and mobile satellite communication systems, uplink access technology for LTE-based GEO satellite has become a popular research topic for satellite system. In order to solve the problem of unreasonable design for PRACH signal structure and reduce the effect of time uncertainty, this paper proposes a novel random access preamble based on time pre-compensation (TPC) for LTE-Satellite System. In this scheme, by applying the method of non-linear least squares, the user terminal (UT) can use the receiving power to estimate the communication round trip delay (RTD) and based on the transmission delay of the beam center and the satellite, RTD can be compensated before transmission. Therefore, the preamble length and duration can be reduced without related to the maximum of RTD. In order to verify the performance of the scheme, the Mat lab is used to build a test system. The simulation results show that the proposed preamble satisfies the requirements of LTE-Satellite System, and the better performance than previous researches is obtained.
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