2024 |
Shahab MB, Johnson SJ, Chalup S, 'Data-Driven Low-Complexity Detection in Grant-Free NOMA for IoT', IEEE Internet of Things Journal, 11 12388-12407 (2024)
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2024 |
Salari A, Shirvanimoghaddam M, Shahab MB, Arablouei R, Johnson S, 'Design and Analysis of Clustering-Based Joint Channel Estimation and Signal Detection for NOMA', IEEE Transactions on Vehicular Technology, 73 2093-2108 (2024)
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2023 |
Khan S, Durrani S, Shahab MB, Johnson SJ, Camtepe S, 'Joint User and Data Detection in Grant-Free NOMA With Attention-Based BiLSTM Network', IEEE Open Journal of the Communications Society, 4 1499-1515 (2023) [C1]
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Nova |
2022 |
Salari A, Shirvanimoghaddam M, Shahab MB, Li Y, Johnson S, 'NOMA Joint Channel Estimation and Signal Detection Using Rotational Invariant Codes and GMM-Based Clustering', IEEE Communications Letters, 26 2485-2489 (2022) [C1]
This letter studies the joint channel estimation and signal detection for the uplink power-domain non-orthogonal multiple access. The proposed technique performs both detection an... [more]
This letter studies the joint channel estimation and signal detection for the uplink power-domain non-orthogonal multiple access. The proposed technique performs both detection and estimation without the need of pilot symbols by using a clustering technique. We apply rotational-invariant coding to assist signal detection at the receiver without sending pilot symbols. We utilize Gaussian mixture model (GMM) to automatically cluster the received signals without supervision and optimize decision boundaries to improve the bit error rate (BER) performance. Simulation results show that the proposed scheme without using any pilot symbol achieves almost the same BER performance as that for the conventional maximum likelihood receiver with full channel state information.
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Nova |
2022 |
Shahab MB, Johnson SJ, Shirvanimoghaddam M, Dohler M, 'Enabling transmission status detection in grant-free power domain non-orthogonal multiple access for massive Internet of Things', TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES, 33 (2022) [C1]
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Nova |
2022 |
Azam I, Shahab MB, Shin SY, 'Energy-Efficient Pairing and Power Allocation for NOMA UAV Network Under QoS Constraints', IEEE Internet of Things Journal, 9 25011-25026 (2022) [C1]
Due to the increasing number of unmanned aerial vehicles (UAVs) with generally limited battery power, energy-efficient data transmission schemes with massive connectivity capabili... [more]
Due to the increasing number of unmanned aerial vehicles (UAVs) with generally limited battery power, energy-efficient data transmission schemes with massive connectivity capabilities are required for future wireless networks. Nonorthogonal multiple access (NOMA) is a promising technique that provides such massive connectivity by allowing superposed data transmission of multiple users over the same resource block. This article presents a user pairing and power allocation technique for energy efficiency and Quality-of-Service (QoS)-based NOMA transmission for cellular-connected mobile UAVs and ground users (GUs) in a NOMA UAV network. The aim is to minimize the energy consumption of both aerial users (AUs) and GUs during uplink data transmission and guarantee their required transmission rates through efficient pairing and power optimization. Therefore, a joint pairing and power optimization problem is formulated as a nonconvex optimization problem under QoS constraints. Furthermore, a suboptimal solution is proposed to show that the proposed energy-efficient pairing technique effectively fulfills the QoS requirements of both GUs and AUs in a network with low complexity. The simulation results of the proposed technique show the performance gain in terms of energy efficiency, outage probability, and pairing complexity compared to the conventional channel condition and power-consumption-based NOMA pairing and power allocation techniques.
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Nova |
2021 |
Shahab MB, Johnson SJ, Shirvanimoghaddam M, Dohler M, 'Receiver Design for Uplink Power Domain NOMA with Discontinuous Transmissions', IEEE Communications Letters, 25 2738-2742 (2021) [C1]
Uplink power domain non-orthogonal multiple access (PD-NOMA) allows multiple users to simultaneously transmit their data over the same resource block by using different power leve... [more]
Uplink power domain non-orthogonal multiple access (PD-NOMA) allows multiple users to simultaneously transmit their data over the same resource block by using different power levels, which are exploited by the base station (BS) for multi-user detection (MUD). Conventional PD-NOMA receivers can perform MUD when the data streams from all the multiplexed users are continuous, and the received signal is always a superposition of symbols from each user. However, the data received from each user may not always be continuous due to sporadic activity, and may contain missed packets or moments of silence. In such scenarios, the BS needs to precisely identify the users whose data packets are received at a particular time to successfully recover their messages. In this context, this letter proposes multiple detectors to efficiently detect user activity and perform MUD in such situations. It is shown through simulations that the proposed detectors significantly outperform conventional PD-NOMA receivers in terms of the bit error rate.
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Nova |
2020 |
Hendraningrat DK, Shahab MB, Shin SY, 'Virtual user pairing based non-orthogonal multiple access in downlink coordinated multipoint transmissions', IET Communications, 14 1910-1917 (2020) [C1]
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Nova |
2020 |
Shahab MB, Johnson SJ, Shirvanimoghaddam M, Chafii M, Basar E, Dohler M, 'Index Modulation Aided Uplink NOMA for Massive Machine Type Communications', IEEE Wireless Communications Letters, 9 2159-2162 (2020) [C1]
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Nova |
2020 |
Shahab MB, Abbas R, Shirvanimoghaddam M, Johnson SJ, 'Grant-free Non-orthogonal Multiple Access for IoT: A Survey', IEEE Communications Surveys & Tutorials, 22 1805-1838 (2020) [C1]
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Nova |
2020 |
Azam I, Shahab MB, Shin SY, 'Role switching and power allocation technique for mobile users in non-orthogonal multiple access', Physical Communication, 43 (2020) [C1]
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Nova |
2019 |
Lee MH, Shahab MB, Shin SY, 'On the performance of non-orthogonal multiple access considering backward compatibility', Physical Communication, 37 (2019) [C1]
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Nova |
2018 |
Kader MF, Shahab MB, Shin SY, 'Non-orthogonal multiple access for a full-duplex cooperative network with virtually paired users', COMPUTER COMMUNICATIONS, 120 1-9 (2018)
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2018 |
Shahab MB, Shin SY, 'Time Shared Half/Full-Duplex Cooperative NOMA with Clustered Cell Edge Users', IEEE Communications Letters, 22 1794-1797 (2018) [C1]
This letter proposes time sharing (TS)-based half/full-duplex (HD/FD) cooperative non-orthogonal multiple access (CRNOMA) schemes, namely, TS-HD-CRNOMA and TS-FD-CRNOMA to efficie... [more]
This letter proposes time sharing (TS)-based half/full-duplex (HD/FD) cooperative non-orthogonal multiple access (CRNOMA) schemes, namely, TS-HD-CRNOMA and TS-FD-CRNOMA to efficiently utilize the spectrum of unpaired users. A scenario with more cell edge users (CEUs) than cell center users is considered. Both schemes pair a CCU with multiple clustered CEUs in a TS fashion via a relay, thereby efficiently utilizing the frequency bands of multiple CEUs, which may remain underused in conventional CRNOMA. Ergodic sum capacity of the schemes is analytically derived, validated through simulations, and compared with conventional multiple access schemes to show the achieved capacity gains.
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2018 |
Shahab MB, Shin SY, 'User pairing and power allocation for non-orthogonal multiple access: Capacity maximization under data reliability constraints', Physical Communication, 30 132-144 (2018) [C1]
This paper comprehensively investigates the dynamics of user pairing and power allocation (UPPA) in non-orthogonal multiple access (NOMA). The focal point of this work is to explo... [more]
This paper comprehensively investigates the dynamics of user pairing and power allocation (UPPA) in non-orthogonal multiple access (NOMA). The focal point of this work is to explore the effects of UPPA on capacity and bit error rate (BER) of NOMA users, thereby understanding the tradeoffs involved when UPPA is performed. These tradeoffs facilitate the design of UPPA strategies to maximize system capacity and satisfy individual target data rates of users without exceeding their allowed BER upper bounds to meet the strict data reliability constraints. Data reliability is critical in NOMA and serves as bottleneck to its manifold capacity gains, as NOMA users are prone to significant interference. The existing UPPA strategies focusing on capacity maximization or user fairness completely neglect this extremely critical tradeoff. This paper provides extensive analysis and results of UPPA considering individual/sum capacity and BER of users. Results are summarized in the form of look-up tables, which facilitate swift selection of user pairs and power allocation factors. The process of performing UPPA by using the developed look up tables, such that both capacity and data reliability goals can be simultaneously achieved, is comprehensively explained in the end.
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2017 |
Shahab MB, Usman MA, Shin SY, 'Bandwidth Adaptation by Squeezing Idle Traffic in Browsers: An Active Window Detection Based Approach for Next Generation Networks', IEEE COMMUNICATIONS LETTERS, 21 310-313 (2017) [C1]
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Nova |
2017 |
Kader MF, Shahab MB, Shin SY, 'Exploiting Non-Orthogonal Multiple Access in Cooperative Relay Sharing', IEEE COMMUNICATIONS LETTERS, 21 1159-1162 (2017) [C1]
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2017 |
Shahab MB, Shin SY, 'On the performance of a virtual user pairing scheme to efficiently utilize the spectrum of unpaired users in NOMA', PHYSICAL COMMUNICATION, 25 492-501 (2017) [C1]
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2016 |
Shahab MB, Kader MF, Shin SY, 'A Virtual User Pairing Scheme to Optimally Utilize the Spectrum of Unpaired Users in Non-orthogonal Multiple Access', IEEE SIGNAL PROCESSING LETTERS, 23 1766-1770 (2016) [C1]
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2016 |
Shahab MB, Irfan M, Kader MF, Shin SY, 'User pairing schemes for capacity maximization in non-orthogonal multiple access systems', WIRELESS COMMUNICATIONS & MOBILE COMPUTING, 16 2884-2894 (2016) [C1]
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