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Introducing relay node to Device-to-Device (D2D) technology can extend the cell coverage range and improve the system performance, and the relay selection is a key point of relay-assisted D2D communication. In this paper, the relay selection problem is discussed for D2D communication underlaying cellular network. We propose a two-stages relay selection and resource allocation joint method for relay-assisted...
Full-duplex multiple-input-multiple-output (MIMO) relaying is capable of providing coverage for remote users with low power consumption, by exploiting the spatial dimensions of MIMO to suppress different types of interference, including self interference (SI) and multi-user interference (MUI). In a general network with multiple full-duplex MIMO relays, inter-relay interference (IRI) emerges and degrades...
Low-Power and Lossy networks (LLNs) cover a wide scope of applications, including, but not limit to, industrial control, healthcare and building automation, which has proliferated into both industrial and academic areas in recent years. Routing plays a significant role to the overall architecture of LLNs. The IPv6 Routing Protocol for Low Power and Lossy Networks (RPL) is standardized by IETF to provide...
Full-duplex relaying (FDR) is an efficient technique to serve remote users with low power consumption, however, careful interference suppression is needed to mitigate self interference (SI) and multi-user interference (MUI). When multiple FDRs are employed, inter-relay interference (IRI) emerges and degrades system performance severely by consuming excessive transmit power. In this paper, distributed...
A physical-layer security enhancement scheme in analog network coding systems based on artificial noise is proposed in this paper. In broadcast phase, the Relay node selects part of antennas from its total antennas as the received reference signal, and derives the beamforming matrix and artificial noise vector from the equivalent channel fading matrix. The simulation results show that the proposed...
In this paper, we investigate the energy efficiency maximization problem of analog network coding (ANC) based two-way relay (TWR) assisted cellular network under quality of service (QoS) constraints through transmit power optimization. Circuit power cannot be ignored since it influences energy efficiency greatly. However, the difficulty is that maximizing energy efficiency is shown to be non-convex...
In future cellular systems, some energy harvesting (EH) powered relaying nodes may be deployed to achieve energy saving and quality of service (QoS) improvement, while base stations still get energy from power grid to ensure basic coverage requirements. In this paper, we focus on maximizing the energy efficiency (EE) of the non-EH source with the help of the EH decode-and-forward (DF) relaying nodes...
Most of existing studies about two-way relay network rely on the assumption that two sources transmit with symmetric traffics, which is often unsatisfied in practical application. In this paper, we focus on asymmetric traffics for two-way relay network, and investigate how to minimize system outage probability. To achieve this objective, we first propose a strategy to combine relay selection (RS)...
The station density is believed to be a crucial factor that affects the energy efficiency of relay-assisted cellular networks dramatically, which can not be neglected for practical network design and planning. In this paper, we propose an analytical model to investigate how the station density affects the energy efficiency of relay-assisted cellular networks. With the aid of stochastic geometry theory,...
Capacity and Coverage are the two major concerns for the wireless operators to deploy cellular networks. This paper investigates the uplink capacity and coverage of relay-assisted UMTS network when multiuser detection techniques are employed at both macrocell base station (BS) and relay station (RS). A hierarchical geometric system model is used where the fixed relay stations are deployed within the...
Cooperative spectrum sharing can effectively improve spectrum usage by allowing secondary users (SUs) to dynamically share the licensed bands with primary users (PUs). Meanwhile, an SU can relay a PU's traffic to improve the PU's effective data rate. In this paper, we consider a sequential spectrum bargaining process to achieve cooperative spectrum sharing between one PU and one SU over multiple time...
The mobility patterns of nodes is essential for the design of data dissemination in Delay-Tolerant network (DTN). This paper proposes a data dissemination policy by using human mobility model in DTN in which wireless devices are carried by humans, referred as HMP. HMP selects relay nodes rigidly and improves the efficiency of data forwarding by using the factor set, which is composed of Destination-Matching...
In this paper, we study the joint power and channel resource allocation problem for a multiuser F/TDMA decode-and-forward (DF) relay network under per-node power constraints and a total channel resource constraint. Our goal is to maximize the total throughput achieved by the systems. To that end, we formulate a joint power and channel resource allocation problem. We develop an iterative optimization...
The combination of relay and Multiple-Input Multiple-Output (MIMO) techniques can significantly benefit the signal transmission in cellular networks. In this work, we propose a novel relaying scheme for the relay assisted MIMO broadcast channel including user classification and preceding. The users are firstly classified as Direct Link (DL) users and Relay Link (RL) users according to their channel...
Based on decode-and-forward strategy, we investigate the achievable outage probability of opportunistic relaying, in which there is a single source-destination transmission pair with the help of one of multiple relays. In two-hop scenario, based on adaptive decode-and forward strategy, the achievable diversity-multiplexing tradeoff with the knowledge of channel state amplitudes is analyzed. We show...
We consider a source-destination pair assisted by multiple decode-and-forward relays without channel state information at transmitter (CSIT). We investigate three schemes exploiting spatial diversity including multiple-relay cooperation (MR-Coop), conventional multiple-relay relaying (MR-Relay), and multiple-input-single-output (MISO). The total power is equally allocated to transmission partners...
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