Novel Transceiver Architecture for an Asynchronous Grant-Free IDMA System

被引:20
|
作者
Kim, Soohyun [1 ]
Kim, Hyunsoo [1 ]
Noh, Hoondong [2 ]
Kim, Younsun [2 ]
Hong, Daesik [1 ]
机构
[1] Yonsei Univ, Sch Elect & Elect Engn, Seoul 120749, South Korea
[2] Samsung Elect Co, Samsung Res, Seoul 06765, South Korea
基金
新加坡国家研究基金会;
关键词
Asynchronous transmission; grant-free transmission; interleave-division multiple access (IDMA); preamble; PARAMETER-ESTIMATION; MULTIUSER DETECTION; ACCESS;
D O I
10.1109/TWC.2019.2925791
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper investigates a grant-free non-orthogonal multiple access (NOMA) system where massive number of users wake up and send data right away without performing a grant-based initial access procedure. Since no scheduling grant is used in this system, the base station (BS) does not know which user is transmitting on each resource. Also, due to the lack of an uplink (UL) timing control process, multiple user's signals are asynchronously received at the BS. This causes asynchronous interference, or multiuser inter-carrier and inter-symbol interference. We propose two ideas to address these two problems. We first propose an auxiliary preamble structure to successfully detect the user activity, even in the presence of a massive number of users. We, then, propose a modification to the interleave-division multiple access (IDMA) receiver to mitigate asynchronous interference. The simulation results show that the proposed scheme significantly improves the preamble detection performance and BER performance compared to the conventional schemes. Furthermore, we show that the proposed grant-free NOMA system can achieve much better performance than the grant-based NOMA system in terms of transmission time and signaling overhead.
引用
收藏
页码:4491 / 4504
页数:14
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