The user-collaborative PDMA technology is introduced into the communication of the downlink system in integrated satellite-terrestrial networks,whose purpose is to allow the best channel users to act as half-duplex relay nodes to decode and forward information from other users when the satellite sends PDMA superimposed signals to users,in order to improve the communication performance of weak users.This paper deduces the outage prob-ability and ergodic capacity expressions of the system under different fading conditions for three users,verifies the correctness of theoretical analysis through simulation,and confirms that compared with traditional orthogonal multiple access and non-collaborative PDMA sys-tems,the user-collaborative PDMA scheme can achieve higher outage performance and erg-odic capacity.
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