Multi-Sequence Spreading Random Access (MSRA) for Compressive Sensing-Based Grant-Free Communication
- Authors
- Abebe, Ameha Tsegaye; Kang, Chung G.
- Issue Date
- 11월-2021
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Channel estimation; Coherence; Compressive sensing; Data communication; Multiuser detection; NOMA; Narrowband; Wideband; grant-free random access; machine-type communication; multiple measurement vector (MMV); multiple-sequence spreading random access (MSRA); non-orthogonal multiple access (NOMA)
- Citation
- IEEE TRANSACTIONS ON COMMUNICATIONS, v.69, no.11, pp.7531 - 7543
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON COMMUNICATIONS
- Volume
- 69
- Number
- 11
- Start Page
- 7531
- End Page
- 7543
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135851
- DOI
- 10.1109/TCOMM.2021.3103542
- ISSN
- 0090-6778
- Abstract
- The performance of grant-free random access (GF-RA) is limited by the number of accessible random access resources (RRs) due to the absence of collision resolution. Compressive sensing (CS)-based RA schemes scale up the RRs at the expense of increased non-orthogonality among transmitted signals. This paper presents the design of multi-sequence spreading random access (MSRA) which employs multiple spreading sequences to spread the different symbols of a user as opposed to the conventional schemes in which a user employs the same spreading sequence for each symbol. We show that MSRA provides code diversity, enabling the multi-user detection (MUD) to be modeled into a well-conditioned multiple measurement vectors (MMVs) CS problem. The code diversity is quantified by the decrease in the average Babel mutual coherence among the spreading sequences. Moreover, we present a two-stage active user detection (AUD) scheme for both wideband and narrowband implementations. Our theoretical analysis shows that with MSRA activity misdetection falls exponentially while the size of GF-RA frame is increased. Finally, the simulation results show that about 82% increase in utilization of RRs, i.e., more active users, is supported by MSRA than the conventional schemes while achieving the RA failure rate lower bound set by random access collision.
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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