On the Sum-Rate of Contention Resolution in Massive MIMO With NOMA

Pereira, Hebert Douglas; Brante, Glauber; Farhat, Jamil; Souza, Richard Demo; Marinello, José Carlos; Abrão, Taufik

doi:10.1109/access.2021.3055579

Cited by 4 publications

(9 citation statements)

References 30 publications

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“…the interference enough to be decoded correctly i.e., ∆P ≥ 2. While in setting 2, due fail in any previous crucial process, the SIC is admitted imperfect with residual interference factor ϖ = 0.10; this is a typical value of residual factor adopted in NOMA literature [10], [26], and a threshold rate R (b) th2 = 0.585 [bpcu], hence, the signal of interest can lack enough power difference to be decoded perfectly, in this case, we have adopted 0.5 ≤ ∆P < 2.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Our proposed protocol modifies the activation decision rule proposed in the SUCRe-XL protocol [13]. As proposed in [10] we numerically optimize the scale factor, namely δ (K,B) * NOVR-XL within the bias parameter ϵ k , aiming to maximize the system's sumrate, making more than one user consider themselves able to retransmit the selected pilot (in Step 1); hence, increasing the number of possible false positives, i.e., multiple UEs appoint themselves as the contention winner. This is made in a distributed manner, without cooperation with other UEs.…”

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

“…The collision resolution follows the decentralized decision rule, i.e., each user decides whether to continue in the access attempt, by following the decision rule [10]:…”

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

“…Scale factor optimization: the optimal value δ (K,B) * NOVR-XL is based on [10], by deploying exhaustive search approach. The procedure is numerically optimal in the sense of sumrate maximization; hence, each K inactive UEs and B-SA configuration implies an optimal parameter value.…”

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

“…Another extension is proposed in [9], where a graph-based pilot access (SUCR-GBPA) protocol is proposed, enabling all users who lost contention resolution to choose a new pilot at random. Furthermore, combining NOMA and SUCRe was an important evolution; the work in [10] compares the proposed NOMA-RA protocol to the classical SUCRe scheme, allowing two users trying to access the medium with the same pilot signal to resolve collisions by distinguishing them in the power-domain NOMA and attaining a superior sum-rate performance with reduced average latency.…”

Section: Introductionmentioning

confidence: 99%

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NOMA-Based Random Access in mMTC XL-MIMO

Alves

Abrão

2023

IEEE Access

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In machine-type communication (MTC), massive access attempts are generated and the massive MIMO is the key technology to support this demand. To support massive MTC (mMTC), the recent extra-large scale massive multiple-input multiple-output (XL-MIMO) architecture has been seen as a promising technology for providing very high-data rates in high-user density scenarios. Therefore, the large dimension is of the same order as the distances to the user equipment (UE) causing spatial nonstationarities and visibility regions (VRs) to occur across the huge XL array extension. We investigate the random access (RA) problem in crowded XL-MIMO scenarios; the proposed grant-based random access (GB-RA) protocol combining the advantage of non-orthogonal multiple access (NOMA) and strongest user collision resolutions in extra-large arrays (SUCRe-XL) named NOVR-XL can allow access of multiple colliding users in the same XL subarray (SA) selecting the same pilot sequence. The proposed NOVR-XL GB-RA protocol is able to provide a reduction in the number of attempts to access the network, while improving the average sum-rate, as the number of SA increases.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

“…The collision resolution follows the decentralized decision rule, i.e., each user decides whether to continue in the access attempt, by following the decision rule [10]:…”

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

Section: B Exploring Vrs Subarrays and Noma In Novr-xl Protocolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NOMA-Based Random Access in mMTC XL-MIMO

Alves

Abrão

2023

IEEE Access

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Crowded MTC Random Access in NOMA XL-MIMO

Alves

Abrão

2022

2022 Symposium on Internet of Things (SIoT)

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Massive MIMO is one of the key technologies to support the growth of massive access attempts by devices, such as in massive machine type communication (mMTC). The evolution of antenna array technology brought the recent extra-large scale massive multiple input multiple output (XL-MIMO) systems, seen as a promising technology for providing very high-data rates in high-user density scenarios. Spatial non stationarities and visibility regions (VRs) occur across all huge XL array extension, since its large dimension is of the same order of the distances to the user equipment (UE). We investigate the random access (RA) problem in crowded XL-MIMO scenarios. The proposed nonorthogonal multiple access (NOMA) visible region extra large array (NVR-XL) protocol takes advantage of the power domain NOMA to allow access of two or more users colliding in the same XL sub-array (SA) selecting the same pilot sequence. The NVR-XL provides a reduction in the number of attempts to access the network, while improving the average sum-rate, as the number of SA increases.

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