Sparse Code Multiple Access Communication Networks Based on Multi-Level Quality-of-Service Frequency-hopping for Heterogeneous Multi-tier Multi-cell
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摘要: 该文主要解决未来大规模接入场景下，无线异构多层多小区通信网络设计及其多级服务质量(QoS)实现等问题。针对多层异构大规模接入网络的通信需求，该文提出一种基于跳频(FH)的稀疏码分多址接入(SCMA)多层异构传输方案(FH/SCMA)。该通信方案中，小区内大规模用户数据通过SCMA技术复用，异构网络的层间小区和层内小区通过跳频码分多址进行区分。由于传统跳频只能提供同一级别的频点碰撞率(即同一误码率)，无法保证异构网络多级QoS需求, 因此该文进而提出一类新的具有两级汉明相关值的跳频序列集合，利用交织技术给出了这类跳频序列的设计方法。为了验证所提出的多级QoS跳频及其异构多层FH/SCMA通信性能，该文从序列设计和系统分析方面进行了严谨的理论分析和大量的仿真验证。研究表明，采用了新型跳频SCMA技术的多层异构网络可保证大规模用户接入、有效抑制多层小区干扰和衰落信道影响；同时，又可实现异构多层网络多级QoS传输质量需求(多级误码率(BER))。该文的研究成果从信号处理与传输角度，为多层异构网络设计及其多级QoS传输需求提供了有价值的解决方案。Abstract: 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.
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