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Article: Exploiting Semantic Communication for Non-Orthogonal Multiple Access
Title | Exploiting Semantic Communication for Non-Orthogonal Multiple Access |
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Authors | |
Keywords | Fading channel interference management non-orthogonal multiple access rate region semantic communication |
Issue Date | 2023 |
Citation | IEEE Journal on Selected Areas in Communications, 2023, v. 41, n. 8, p. 2563-2576 How to Cite? |
Abstract | A novel semantics-empowered two-user uplink non-orthogonal multiple access (NOMA) framework is proposed for resource efficiency enhancement. More particularly, a secondary far user (F-user) employs the semantic communication (SemCom) while a primary near user (N-user) employs the conventional bit-based communication (BitCom). The fundamental performance limit, namely semantic-versus-bit (SvB) rate region, of the proposed semantics-empowered NOMA framework is characterized. The equivalent SvB rate region achieved by the conventional BitCom-based NOMA is provided as the baseline scheme. It unveils that, compared to BitCom, SemCom can significantly improve the F-user's performance when its permitted transmit power is strictly capped, but may perform worse when its permitted transmit power is high. Guided by this result, the proposed semantics-empowered NOMA framework is investigated over fading channels. An opportunistic SemCom and BitCom scheme is proposed, which enables the secondary F-user to participate in NOMA via the most suitable communication method at each fading state, thus striking a good tradeoff between its own achieved performance and the interference imposed on the primary N-user. Two scenarios are considered for employing the opportunistic scheme, namely on-off resource management and continuous resource management. For each scenario, the optimal communication policy over fading channels is derived for maximizing the ergodic semantic rate achieved at the secondary F-user, subject to the minimum ergodic bit rate constraint of the primary N-user. Numerical results show that: 1) proposed opportunistic scheme in both scenarios can achieve higher communication performance for NOMA than the baseline schemes merely employing SemCom or BitCom; 2) SemCom can better guarantee the performance of the F-user admitted in NOMA than BitCom when the communication requirement of the primary N-user is high; and 3) continuous power control at the F-user is necessary for ensuring high performance over fading channels, while the on-off time scheduling is sufficient. |
Persistent Identifier | http://hdl.handle.net/10722/349924 |
ISSN | 2023 Impact Factor: 13.8 2023 SCImago Journal Rankings: 8.707 |
DC Field | Value | Language |
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dc.contributor.author | Mu, Xidong | - |
dc.contributor.author | Liu, Yuanwei | - |
dc.date.accessioned | 2024-10-17T07:01:53Z | - |
dc.date.available | 2024-10-17T07:01:53Z | - |
dc.date.issued | 2023 | - |
dc.identifier.citation | IEEE Journal on Selected Areas in Communications, 2023, v. 41, n. 8, p. 2563-2576 | - |
dc.identifier.issn | 0733-8716 | - |
dc.identifier.uri | http://hdl.handle.net/10722/349924 | - |
dc.description.abstract | A novel semantics-empowered two-user uplink non-orthogonal multiple access (NOMA) framework is proposed for resource efficiency enhancement. More particularly, a secondary far user (F-user) employs the semantic communication (SemCom) while a primary near user (N-user) employs the conventional bit-based communication (BitCom). The fundamental performance limit, namely semantic-versus-bit (SvB) rate region, of the proposed semantics-empowered NOMA framework is characterized. The equivalent SvB rate region achieved by the conventional BitCom-based NOMA is provided as the baseline scheme. It unveils that, compared to BitCom, SemCom can significantly improve the F-user's performance when its permitted transmit power is strictly capped, but may perform worse when its permitted transmit power is high. Guided by this result, the proposed semantics-empowered NOMA framework is investigated over fading channels. An opportunistic SemCom and BitCom scheme is proposed, which enables the secondary F-user to participate in NOMA via the most suitable communication method at each fading state, thus striking a good tradeoff between its own achieved performance and the interference imposed on the primary N-user. Two scenarios are considered for employing the opportunistic scheme, namely on-off resource management and continuous resource management. For each scenario, the optimal communication policy over fading channels is derived for maximizing the ergodic semantic rate achieved at the secondary F-user, subject to the minimum ergodic bit rate constraint of the primary N-user. Numerical results show that: 1) proposed opportunistic scheme in both scenarios can achieve higher communication performance for NOMA than the baseline schemes merely employing SemCom or BitCom; 2) SemCom can better guarantee the performance of the F-user admitted in NOMA than BitCom when the communication requirement of the primary N-user is high; and 3) continuous power control at the F-user is necessary for ensuring high performance over fading channels, while the on-off time scheduling is sufficient. | - |
dc.language | eng | - |
dc.relation.ispartof | IEEE Journal on Selected Areas in Communications | - |
dc.subject | Fading channel | - |
dc.subject | interference management | - |
dc.subject | non-orthogonal multiple access | - |
dc.subject | rate region | - |
dc.subject | semantic communication | - |
dc.title | Exploiting Semantic Communication for Non-Orthogonal Multiple Access | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1109/JSAC.2023.3288242 | - |
dc.identifier.scopus | eid_2-s2.0-85162863476 | - |
dc.identifier.volume | 41 | - |
dc.identifier.issue | 8 | - |
dc.identifier.spage | 2563 | - |
dc.identifier.epage | 2576 | - |
dc.identifier.eissn | 1558-0008 | - |