The hybrid carrier (HC) system rooted in the carrier fusion concept is gradually garnering attention. In this paper

we study the extended hybrid carrier (EHC) multiple access scheme to ensure reliable wireless communication. By employing the EHC modulation

a power layered multiplexing framework is realized

which exhibits enhanced interference suppression capability owing to the more uniform energy distribution design. The implementation method and advantage mechanism are explicated respectively for the uplink and downlink

and the performance analysis under varying channel conditions is provided. In addition

considering the connectivity demand

we explore the non-orthogonal multiple access (NOMA) method of the EHC system and develop the EHC sparse code multiple access scheme. The proposed scheme melds the energy spread superiority of EHC with the access capacity of NOMA

facilitating superior support for massive connectivity in high mobility environments. Simulation results have verified the feasibility and advantages of the proposed scheme. Compared with existing HC multiple access schemes

the proposed scheme exhibits robust bit error rate performance and can better guarantee multiple access performance in complex scenarios of next-generation communications.