Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks
We investigate the uplink non-orthogonal multiple access (NOMA)-based Internet-of-Things (IoT) networks, where each IoT device (station: STA) equipped with a single antenna exploits the <italic>constellation-rotated</italic> space-time line code (CR-STLC) to send signals to an access poi...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Open Journal of the Communications Society |
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| Online Access: | https://ieeexplore.ieee.org/document/9749606/ |
| _version_ | 1818027358506975232 |
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| author | Ki-Hun Lee Jeong Seon Yeom Jingon Joung Bang Chul Jung |
| author_facet | Ki-Hun Lee Jeong Seon Yeom Jingon Joung Bang Chul Jung |
| author_sort | Ki-Hun Lee |
| collection | DOAJ |
| description | We investigate the uplink non-orthogonal multiple access (NOMA)-based Internet-of-Things (IoT) networks, where each IoT device (station: STA) equipped with a single antenna exploits the <italic>constellation-rotated</italic> space-time line code (CR-STLC) to send signals to an access point (AP) equipped with two receive antennas. The AP decodes the signals transmitted from the STAs with the <italic>optimal</italic> joint maximum-likelihood (JML) detector. As a main result, we mathematically analyze both the bit-error-rate (BER) performance and the spatial diversity order of each STA in the two-user uplink CR-STLC NOMA system. In particular, it is shown that the two-user uplink CR-STLC NOMA system achieves the optimal diversity order regardless of the constellation rotation angle in the high signal-to-noise ratio (SNR) regime. We also consider two different rotation angle optimization techniques (dynamic rotation & fixed rotation) to improve the BER performance in the practical SNR regime, and found that the fixed rotation approach is simple but yields almost the same performance as the dynamic approach. Finally, we show that the uplink CR-STLC NOMA system achieves the spatial diversity order of 1 even when more than two STAs send packets simultaneously. It is worth noting that all STAs obtain an improved spatial diversity gain compared to that without constellation rotation. |
| first_indexed | 2024-12-10T04:46:38Z |
| format | Article |
| id | doaj.art-5f5ce6b3166e4520a3cda83aecc59713 |
| institution | Directory Open Access Journal |
| issn | 2644-125X |
| language | English |
| last_indexed | 2024-12-10T04:46:38Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Communications Society |
| spelling | doaj.art-5f5ce6b3166e4520a3cda83aecc597132022-12-22T02:01:43ZengIEEEIEEE Open Journal of the Communications Society2644-125X2022-01-01370571710.1109/OJCOMS.2022.31648769749606Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT NetworksKi-Hun Lee0https://orcid.org/0000-0002-0415-5603Jeong Seon Yeom1https://orcid.org/0000-0003-0480-034XJingon Joung2https://orcid.org/0000-0002-9551-1123Bang Chul Jung3https://orcid.org/0000-0002-4485-9592Department of Electronics Engineering, Chungnam National University, Daejeon, South KoreaDepartment of Electronics Engineering, Chungnam National University, Daejeon, South KoreaSchool of Electrical and Electronics Engineering, Chung-Ang University, Seoul, South KoreaDepartment of Electronics Engineering, Chungnam National University, Daejeon, South KoreaWe investigate the uplink non-orthogonal multiple access (NOMA)-based Internet-of-Things (IoT) networks, where each IoT device (station: STA) equipped with a single antenna exploits the <italic>constellation-rotated</italic> space-time line code (CR-STLC) to send signals to an access point (AP) equipped with two receive antennas. The AP decodes the signals transmitted from the STAs with the <italic>optimal</italic> joint maximum-likelihood (JML) detector. As a main result, we mathematically analyze both the bit-error-rate (BER) performance and the spatial diversity order of each STA in the two-user uplink CR-STLC NOMA system. In particular, it is shown that the two-user uplink CR-STLC NOMA system achieves the optimal diversity order regardless of the constellation rotation angle in the high signal-to-noise ratio (SNR) regime. We also consider two different rotation angle optimization techniques (dynamic rotation & fixed rotation) to improve the BER performance in the practical SNR regime, and found that the fixed rotation approach is simple but yields almost the same performance as the dynamic approach. Finally, we show that the uplink CR-STLC NOMA system achieves the spatial diversity order of 1 even when more than two STAs send packets simultaneously. It is worth noting that all STAs obtain an improved spatial diversity gain compared to that without constellation rotation.https://ieeexplore.ieee.org/document/9749606/constellation rotationInternet-of-Thingsjoint maximum-likelihood detectionnon-orthogonal multiple accessspace-time line codesspatial diversity |
| spellingShingle | Ki-Hun Lee Jeong Seon Yeom Jingon Joung Bang Chul Jung Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks IEEE Open Journal of the Communications Society constellation rotation Internet-of-Things joint maximum-likelihood detection non-orthogonal multiple access space-time line codes spatial diversity |
| title | Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks |
| title_full | Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks |
| title_fullStr | Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks |
| title_full_unstemmed | Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks |
| title_short | Performance Analysis of Uplink NOMA With Constellation–Rotated STLC for IoT Networks |
| title_sort | performance analysis of uplink noma with constellation x2013 rotated stlc for iot networks |
| topic | constellation rotation Internet-of-Things joint maximum-likelihood detection non-orthogonal multiple access space-time line codes spatial diversity |
| url | https://ieeexplore.ieee.org/document/9749606/ |
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