A Novel Framework of K-repetition Grant-free Access via Diversity Slotted Aloha (DSA)

This article introduces a novel framework of multi-user detection (MUD) forK-repetition grant-free non-orthogonal multiple access (K-GF-NOMA), called$\alpha$ iterative interference cancellation diversity slotted aloha($\alpha$-IIC-DSA). The proposed framework targets at a simple yet effectivedecoding process where the AP can intelligently exploit the correlation amongsignals received at different resource blocks (RBs) so as to generate requiredmulti-access interference (MAI) for realizing the signal-interferencecancellation (SIC) based MUD. By keeping all operation and hardware complexityat the access point (AP), the proposed framework is applicable to the scenarioswith random and uncoordinated access by numerous miniature mMTC devices(MTCDs). Numerical experiments are conducted to gain deep understanding on theperformance of launching the proposed framework for K-GF-NOMA.