Sparse Code Multiple Access Communication Networks Based on Multi-Level Quality-of-Service Frequency-hopping for Heterogeneous Multi-tier Multi-cell

This paper dedicates to the design of heterogeneous multi-tier multi-cell communication networks and its multi-level Quality-of- Service (QoS) implementation in the future massive connectivity scenarios. To meet the requirement of massive connectivity in heterogeneous multi-tier networks, a Frequency-Hopping (FH) based Sparse Code Multiple Access (FH/SCMA) transmission is proposed for heterogeneous multi-tier infrastructure in this paper. In such a network infrastructure, all users' transmitted data are multiplexed by SCMA technique and all intra- and inter- cells located in multi-tier are distinguished by FH multi-access technique. Since the traditional FH technique just provides a single-level frequency-hit rate (i.e., a single-level error-rate), it can not offer the multi-QoS for heterogeneous multi-tier networks. Thus, a novel type of FH sequence set with two level Hamming-correlations is proposed in this paper, and its construction algorithm is designed via the interleaving technique. The strictly theoretical analysis and extensively simulated analysis are carried out to verify the multi-QoS performance of the proposed heterogeneous FH/SCMA networks. The results of this paper are shown that, by employing the new FH into SCMA, the heterogeneous multi-tier networks possesses the massive connectivity, and the strongly anti- multi-tier interference and anti-fading capability; Meanwhile, it achieves successfully the multi-QoS target (i.e., multi-level Bit-Error Ratio( BER)). The proposed FH/SCMA provides a valuable solution to heterogeneous multi-tier networks and multi-QoS requirement from the viewpoint of signal and transmission.