Design of an Enhanced Two-step Satellite-Ground Random Access Method Under High Dynamic Conditions
The low earth orbit satellite features strong space attenuation,rapid movement,and extensive coverage.To address the is-sues of low velocity and low capacity of satellite-ground random access,as well as the severe impacts from Doppler frequency shifts,this paper proposes an enhanced two-step satellite-ground random access method under high dynamic conditions.On the one hand,by re-peating the user's uplink MsgA data multiple times and incorporating successive interference cancellation at the receiver for demodula-tion,this method allows for the utilization of collided data and reduces the probability of user retransmissions,thus increasing the veloci-ty and capacity of the random access process.On the other hand,by introducing two-root preambles and performing joint detection at the receiver,this method tackles the problem of low preamble detection success rates under high dynamic conditions.Ultimately,compared to traditional random access schemes,the proposed method achieves faster access velocity and higher access capacity.
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