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Exploiting NOMA for Cooperative Edge Computing

IEEE Wireless Communications, None

Edge computing is a promising technology that provides cloud-like computing services at the network edge in close proximity to mobile devices. In this article, we propose a new paradigm of cooperative edge computing that exploits parallel transmission over the whole resource block of NOMA for parallel computation offloading. Specifically, we consider a basic three-node model consisting of a user, a ...


Experimental Demonstration of an NOMA Scheme for Passive Optical Network

2017 Asia Communications and Photonics Conference (ACP), 2017

We propose NOMA-OFDM for PON, which offers a high throughput, high resistance to fiber dispersion and a higher system capacity. Bidirectional NOMA-OFDM-PON transmission is experimentally demonstrated.


Design of physical layer secure transmission scheme based on SWIPT NOMA systems

2017 IEEE 17th International Conference on Communication Technology (ICCT), 2017

This paper mainly studies the physical layer security problem in the non- orthogonal multiple access (NOMA) system of simultaneous wireless information and power transfer (SWIPT) in the downlink channel. There may be eavesdroppers in the cooperation between SWIPT and NOMA, so the security of transmission rate is not guaranteed. We propose a system of SWIPT and NOMA to transmit the ...


Hybrid Active User Detection for Massive Machine-type Communications in IoT

2018 International Conference on Information and Communication Technology Convergence (ICTC), 2018

Massive machine-type communication (mMTC) concerns the access of massive machine-type communication (MTC) devices to the basestation. To support the massive connectivity, non-orthogonal multiple access (NOMA) and grant-free access have been recently introduced. In grant-free access, each device transmits information without scheduling so that the basestation needs to identify the active devices among all potential devices in a cell. This process, ...


Low-Cost Design of Massive Access for Cellular Internet of Things

IEEE Transactions on Communications, None

In this paper, we investigate the issue of low-cost design of massive access for cellular internet of things (IoT) over spatially correlated Rician fading channels. Specifically, by exploiting a low-overhead transmission protocol, a base station (BS) equipped with a large-scale antenna array and low-resolution analog-to-digital converters (ADCs) is deployed to serve a massive number of IoT devices with low-complexity successive ...


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  • Exploiting NOMA for Cooperative Edge Computing

    Edge computing is a promising technology that provides cloud-like computing services at the network edge in close proximity to mobile devices. In this article, we propose a new paradigm of cooperative edge computing that exploits parallel transmission over the whole resource block of NOMA for parallel computation offloading. Specifically, we consider a basic three-node model consisting of a user, a helper, and an AP. The user can simultaneously offload a task to the helper and AP using NOMA, and the helper can compute or/and relay the received task from the user. We first discuss the scenario where the helper acts as either a computing server or a relay. Then we devise a general framework in which the helper has the double roles of assisting the user and has its own task to execute. We show that the proposed scheme can achieve a win-win situation for both the user and helper. Simulations are conducted to illustrate the superior performance of the proposed scheme compared to the conventional schemes without cooperation.

  • Experimental Demonstration of an NOMA Scheme for Passive Optical Network

    We propose NOMA-OFDM for PON, which offers a high throughput, high resistance to fiber dispersion and a higher system capacity. Bidirectional NOMA-OFDM-PON transmission is experimentally demonstrated.

  • Design of physical layer secure transmission scheme based on SWIPT NOMA systems

    This paper mainly studies the physical layer security problem in the non- orthogonal multiple access (NOMA) system of simultaneous wireless information and power transfer (SWIPT) in the downlink channel. There may be eavesdroppers in the cooperation between SWIPT and NOMA, so the security of transmission rate is not guaranteed. We propose a system of SWIPT and NOMA to transmit the physical layer security scheme to attack the eavesdropper. In the QoS of the legitimate users who guarantee the “weak channel”, the “strongest channel” Legal user's security rate. In order to improve the confidentiality of the signals transmitted by the base station, this paper solves the problem of maximizing the security rate by SDR and particle swarm optimization.

  • Hybrid Active User Detection for Massive Machine-type Communications in IoT

    Massive machine-type communication (mMTC) concerns the access of massive machine-type communication (MTC) devices to the basestation. To support the massive connectivity, non-orthogonal multiple access (NOMA) and grant-free access have been recently introduced. In grant-free access, each device transmits information without scheduling so that the basestation needs to identify the active devices among all potential devices in a cell. This process, called an active user detection (AUD), is a challenging problem for the NOMA-based systems since it is difficult to find out the active devices from the superimposed received signal. To address this problem, compressed sensing (CS) based active user detection (AUD) technique exploiting the low activity of devices in mMTC has been introduced. In this paper, we propose an AUD scheme that exploits both pilot and data measurements to improve the AUD performance in grant-free NOMA systems. The key idea is to use the common support information of pilot and data signals in a packet. Numerical results demonstrate that the proposed AUD scheme outperforms the conventional approaches in both AUD and throughput performance.

  • Low-Cost Design of Massive Access for Cellular Internet of Things

    In this paper, we investigate the issue of low-cost design of massive access for cellular internet of things (IoT) over spatially correlated Rician fading channels. Specifically, by exploiting a low-overhead transmission protocol, a base station (BS) equipped with a large-scale antenna array and low-resolution analog-to-digital converters (ADCs) is deployed to serve a massive number of IoT devices with low-complexity successive interference cancellation (SIC) receivers. We first analyze the impacts of the low-cost design on the system performance and derive closed-form expressions for uplink and downlink spectral efficiencies of the cellular IoT. Then, for alleviating the negative impacts of the low-cost design, we propose an algorithm allocating the time for channel estimation, uplink data transmission, and downlink data transmission in a data frame. Finally, extensive simulation results confirm the effectiveness of the proposed low-cost design for the cellular IoT.

  • Optimal Power Allocation for Minimizing the Energy Consumption of a NOMA Base Station with Cell DTx

    In this paper, we consider a base station that jointly employs Non-Orthogonal Multiple Access (NOMA) and Cell Discontinuous Transmission (Cell DTx) in order to reduce its power consumption and we study the problem of optimal power allocation. We show first that this problem is convex and can be solved using only single variable root finding algorithms. Then, we employ numerical simulations in order to assess the performance of the proposed power allocation.

  • Partial Non-Orthogonal Multiple Access (P-NOMA)

    In this paper, we propose a novel hybrid type of power-domain non-orthogonal multiple access (NOMA) in downlink environments, called partial NOMA (P-NOMA). In conventional NOMA, where the signals of user equipments (UEs) are fully overlapped, the utilization of the bandwidth can be maximized, but doing so also maximizes the interference from the other UEs. P-NOMA partially overlaps the UEs’ signals by controlling the extent of the overlap and can thus reduce the interference from other UEs. To verify whether this is a possibility with P-NOMA, we observed the performance tendency of the achievable rate versus the overlap ratio and then confirmed that there is an overlap ratio that achieves performance that is better than that of conventional NOMA with respect to the sum of the achievable rate. In other words, slightly reducing the overlap ratio improves the sum of the achievable rate compared to the full overlap ratio.

  • Experimental demonstration of NOMA visible light communications based on SCFDM

    We experimentally demonstrated a non-orthogonal multiple access (NOMA) scheme in combination with single carrier frequency division multiplexing (SCFDM) for visible light communications (VLC), which in principle could provide high spectral efficiency, high tolerance against multi-path and a lower peak-to- average ratio (PAPR). Compared with orthogonal frequency division multiplexing (OFDM) based NOMA, NOMA-SCFDM has higher tolerance to LED nonlinearity and better bit error rate (BER) performance.

  • Time Switching Based Relaying for Coordinated Transmission Using NOMA

    Simultaneous Wireless Information and Power transfer (SWIPT) is a technique that allows energy harvesting and processing of the received data at the same time. If these two tasks are done one-by-one, SWIPT is said to be using time switching (TS) mechanism. TS is a unique way of mutually scavenging energy and transferring information by slicing the time into two slots for achieving the energy harvesting and information transmission goals together. This paper examines the performance of TS-based SWIPT in a wireless network, where an out-of-coverage user is served utilising Non-Orthogonal Multiple Access (NOMA) technique. NOMA is an evolving power domain multiplexing scheme which combines signals within same frequency/time band by varying power levels for transmission. We consider a relaying environment, where a NOMA based near user is incentivised with energy for transferring the data to a remote user. The performance of our proposed system is evaluated by deriving the expressions for the outage probabilities of all users and the system throughput. The results which are also validated by Monte Carlo simulations, show that the proposed system performs well along and provides additional coverage to a far- located user.

  • Relaying in Non-Orthogonal Multiple Access Systems with Simultaneous Wireless Information and Power Transfer

    Non-orthogonal multiple access (NOMA) technique in cooperative system with energy harvesting is investigated. A decode-and-forward (DF) relay is used to send messages from the base station (BS) to users. Following the time- switching technique, the relay uses a portion of transmission period to collect energy from BS then deliver information to users. System performances are explored in terms of signal-to-noise and outage probability. Simulation results validate the proposed theorem, and show the impact of the combination of these techniques to improve system self-sustainability.



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