第五代(5G)移动通信有服务的许多方面,包括一个通过事(物联网),互联网的技术。为了支持物联网应用的不同业务类型,为大规模的连通性和低延迟异构要求是强制性的。In this paper, service group based filtered orthogonal frequency division multiplexing (FOFDM) combined with interleaved division multiple access (IDMA), i.e., FOFDM-IDMA, is proposed in order to simultaneously support massive connectivity and fulfill the low-latency requirements in the uplink (UL) IoT environment. The proposed FOFDM-IDMA platform has two focal points: first, it enables the coexistence of various time-frequency granularities suitable to diverse service groups, and second, it supports massive connectivity with low latency to provide reliable communications. Thus, the proposed FOFDM-IDMA framework can simultaneously support the requirements of uRLLC (ultrareliable low-latency communications) and mMTC (massive machine-type communications) for the next-generation communication systems. However, the 5G new radio (NR) can solely support the requirements of uRLLC and mMTC independently. Simulation results show that the proposed FOFDM-IDMA platform performs remarkably well, compared to the conventional scheme in the IoT environment.
物联网连接的增长速度明显快于移动宽带连接,预计到2025年联网设备将达到300亿台[GydF4y2Ba
以满足不同服务类别的不同需求[GydF4y2Ba
IDMA是一种多址技术[GydF4y2Ba
在本文中,基于服务组FOFDM与IDMA(FOFDM-IDMA)合并的提出,其允许在不同的时间 - 频率的共存粒度适合于不同的服务组,并且它支持以低等待时间大量连接在的IoT提供可靠的通信环境。此外,提出的FOFDM-IDMA框架可以同时支持下一代通信系统的uRLLC和mMTC的要求。但5G NR只能独立支持uRLLC和mMTC的要求。GydF4y2Ba
本文的其余部分组织如下GydF4y2Ba
数字GydF4y2Ba
在上行链路中对用户OFDM-IDMA收发机的框图GydF4y2Ba
在Rx侧,接收到的信号表示为GydF4y2Ba
我们写GydF4y2Ba
基本信号估计器(ESE)被施加通过芯片干扰消除对每个副载波执行芯片。的ESE的输入包括在方程所接收信号的(GydF4y2Ba
在本节中,服务组基于FOFDM-IDMA平台用于在上行链路的IoT连接的多用户系统,提出了然后,专用参数被配置为根据等待时间要求,以支持不同的服务组。GydF4y2Ba
数字GydF4y2Ba
基于服务组的FOFDM-IDMA收发机的框图。GydF4y2Ba
所发送的信号被表示为GydF4y2Ba
然后,所接收的信号可以被表示为GydF4y2Ba
因此,对于服务组基于FOFDM-IDMA平台的操作过程可以在以下步骤中描述的那样,考虑到要求用户在上行链路中进行服务。GydF4y2Ba
集团GydF4y2Ba
将预定义的参数的设定适合于GydF4y2Ba
所有GydF4y2Ba
在Rx侧的FOFDM解调过程之后,MUD是由ESE和DEC模块执行。的ESE的输出可表示为GydF4y2Ba
此外,DEC模块的功能可以表示为GydF4y2Ba
最后,平均值和所发送的信号的方差由ESE作为估计GydF4y2Ba
值得注意的是,在步骤1中,用户GydF4y2Ba
基于科GydF4y2Ba
灵活的帧结构来支持大量的连接(MC)和低延迟(LL)的多样的IoT服务。GydF4y2Ba
MC和LL的参数配置。GydF4y2Ba
| 参数GydF4y2Ba | MCGydF4y2Ba | 二GydF4y2Ba |
|---|---|---|
| 带宽GydF4y2Ba | 1.4 MHz | |
| TTI长度GydF4y2Ba | 1.2 ms | 0。2 ms |
| 子载波间隔GydF4y2Ba | 3。7五 kHz | 33.33千赫GydF4y2Ba |
| FFT的大小GydF4y2Ba | 512GydF4y2Ba | 48GydF4y2Ba |
| 符号持续时间GydF4y2Ba | 266.67GydF4y2Ba |
三十 |
| 符号#/ TTIGydF4y2Ba | 4GydF4y2Ba | 6GydF4y2Ba |
| CP长度GydF4y2Ba | 10.6GydF4y2Ba |
2.2 |
在表GydF4y2Ba
在本节中,我们执行,用于将滤波的正交频分多址(FOFDMA),OFDM-IDMA,和所提出的FOFDM-IDMA与参数配置为MC的模拟。GydF4y2Ba
对于波形的参数,根据表被配置GydF4y2Ba
研究了FOFDM-IDMA、OFDM-IDMA和FOFDM-IDMA两种方案的误码率性能GydF4y2Ba
BER性能不同FOFDMA,OFDM-IDMA,以及拟议FOFDM-IDMA方案的UE的数量。GydF4y2Ba
三种方案的BER性能:FOFDMA,OFDM-IDMA与MC参数配置,以及所提出的FOFDM-IDMA(包括具有用于MC和LL参数配置两个服务组)中进一步调查GydF4y2Ba
被提议的FOFDM-IDMA、OFDM-IDMA和OFDMA方案的误码率性能与Eb/No的比较。GydF4y2Ba
数字GydF4y2Ba
本文提出的FOFDM-IDMA在物联网环境中提供可靠通信时,能够支持大规模连接并满足低延迟要求。提出了物联网环境的专用框架结构,并为FOFDM平台配置了具体参数。此外,提出的FOFDM-IDMA框架可以同时支持下一代通信系统的uRLLC和mMTC的要求。但5G NR只能独立支持uRLLC和mMTC的要求。仿真结果表明,与传统OFDM-IDMA相比,该方案在目标误码率处的信噪比增益为0.3 dBGydF4y2Ba
我们不应该共享数据,由于项目的隐私政策。GydF4y2Ba
作者宣称,有兴趣就本文发表任何冲突。GydF4y2Ba
林施proposed the idea of the service group based filtered orthogonal frequency division multiplexing (FOFDM) combined with interleaved division multiple access (IDMA), i.e., FOFDM-IDMA, in order to simultaneously support massive connectivity and fulfill the low-latency requirements in the uplink (UL) IoT environment. Moreover, she wrote some technical aspects of the manuscript and also performed the simulations. Ishtiaq Ahmad made all the block diagrams of the manuscript and also drew the flexible frame structure to support diverse IoT services of massive connectivity and low latency. Moreover, he wrote some sections of the manuscript and also corrected all the English mistakes in the manuscript. YuJing He by discussion helped in proposing the FOFDM-IDMA scheme which has the capability of supporting massive connectivity and fulfilling low-latency requirement when providing reliable communications in the IoT environment. Moreover, she wrote some technical equations which helped in the analysis of the proposed scheme. KyungHi Chang was the technical leader of this manuscript. He suggested all the technical issues for the proposed FOFDM-IDMA scheme and also for simulation aspects. In addition, he corrected the whole simulation methodology of this manuscript and also corrected all the mistakes in the simulation environment as well as in the structure of the manuscript.
这项工作是由一个研究所的信息和通信技术促进(IITP)通过为下一代公共安全通信基础技术的发展赠款2017-0下通过科学,信息通信技术和未来规划(MSIP)的韩国政府教育部基金资助支持-00316。GydF4y2Ba