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S. Kim, H. Kim, H. Noh, Y. Kim and D. Hong, "Novel Transceiver Architecture for an Asynchronous Grant-Free IDMA System," in IEEE Transactions on Wireless Communications
[IEEE Trans. Wireless Commun.]
조회 43703
Status : | Published |
---|---|
Date : | 2019-10 |
Title : | Novel Transceiver Architecture for an Asynchronous Grant-Free IDMA System |
Authors : | Soohyun Kim, Hyunsoo Kim, Hoondong Noh, Younsun Kim, and Daesik Hong |
Journal : | IEEE Transactions on Wireless Communications |
Abstract : | This paper investigates a grant-free non-orthogonal multiple access (NOMA) system where massive numbers 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 users’ 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 interleavedivision multiple access (IDMA) receiver to mitigate asynchronous interference. 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. |
URL : | https://ieeexplore.ieee.org/document/8758401 |
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