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The individual applications of network coded opportunistic routing and successive interference cancellation have been proven with significant improvement on throughput performance of wireless multi-hop networks, but there lacks practical optimization on their combination application. Based on a TDMA system, this paper models the throughput maximization as network utility function maximization problem...
This paper addresses the statistical analysis of Transceiver Phase Noise (PHN) effect on Orthogonal Frequency Division Multiple Access (OFDMA) Uplink system performance for arbitrary subcarrier mapping. In most of the previous publications Complex Gaussian distribution of Inter Carrier Interference (ICI) was assumed, however in this paper we derive a closed form expression for the signal-to-interference+...
In this work, coordinated beamforming and power allocation schemes are proposed for multicell downlink non-orthogonal multiple access (NOMA) systems. Beamforming is adopted at the base-station to mitigate both intercell and intracell interference whereas power-domain multiplexing between a pair of users is considered in each spatial dimension. Given the beamforming vectors, intra-pair power allocation...
This paper studies energy-efficient joint transmit and receive beamforming in multi-cell multi-user multiple-input multiple-output systems. We consider conventional network energy efficiency metric where the users can receive unicasting streams in addition to the group-specific common multicasting streams which have certain rate constraints. The goal is to use the transmission resources more efficiently...
A novel distributed scheduling method for minimizing packet routing delays in multi-hop multi-band cognitive radio networks is proposed. The proposed scheduling method exploits spectral awareness in the form of spatial potential fields that characterize sources of interference as repulsive forces and packet destinations as attractive forces. The proposed scheduling protocol operates in four phases,...
Graph-based random access protocols have emerged as an efficient solution to tackle the medium sharing problem for machine type communications. Their remarkable performance is well-understood for scenarios in which devices communicate with a one-hop receiver devoted to collecting packets. Many practical applications, however, foresee the receiver to also act as sender towards a second-hop terminal...
Ultra-dense networks are regarded as a promising candidate for providing high data rate at low implementation cost. With a dense and irregular deployment of access points, spatial reuse will be improved, and varying cellular coverage also known as the amorphous cell is provided, which leads to a more complicated interference environment. In this paper, a novel interference coordination strategy, based...
Co-channel interference is a dominant limiting factor for LTE uplink system capacity. BS (Base station) MMSE-IRC (Minimum mean square error — interference rejection combining) receiver, as a promising approach for spatial domain interference handling, is introduced in LTE-Advanced Release 13. This paper firstly gives the signal model and receiver structure for BS MMSE-IRC. To evaluate MMSE-IRC performance...
Communication, illumination, and energy saving are three basic objectives of visible light communication (VLC) system. However, it's difficult to simultaneously optimize these performances. Therefore, this paper jointly optimizes energy consumption and illumination while communication and other constraints are satisfied. The problem is formulated using multi-objective and multi-control-variable optimization...
Device-to-device (D2D) underlay communication has attracted substantial research attention recently owing to its potential to enhance the network throughput. However, the caused intra-cell interference is quite a challenging issue in D2D underlaying cellular network. In this paper, we investigate the joint power control and resource allocation problem to improve the system performance in such a scenario...
Non-orthogonal multiple access (NOMA) is a promising multiple access scheme to increase the system capacity for future fifth generation (5G) communication systems. However, NOMA with receivers employing conventional successive interference cancellation (SIC) technique requires a careful choice of target rates and power allocation coefficients in order to keep NOMA operational. In this paper, we represent...
In this paper, we use dual-hop relaying to overcome the signal blockage problem that occurs for millimeter waves (mmWaves) due to obstacles located in the propagation environment. Using device-to-device communication, a device in the neighborhood of the transmitter and the receiver can play the role of a relay by amplifying the signal from the source device and forwarding it to the destination device...
We consider a diffusion-based nano-network with N spatially distributed transmitters and one receiver. While the transmitters are linked in a unified entity to perform one transmission, the receiver is large enough to be viewed as a plane. Messages are encoded into the number of nano-scale molecules. Based on these assumptions, we analyze the signal-to-interference ratio, which is based on the average...
In this paper, we consider a scenario of hybrid device-to-device (D2D) & cellular uplink transmissions, where K pairs of D2D user equipments (UEs) are considered. In each D2D pair, one UE intends to communicate with the other UE and access to the base station (BS) at the same time. To deal with the complicated interferences among D2D and cellular uplink transmissions, the power threshold based...
Due to the unreliable nature of wireless links, sensor nodes frequently encounter degraded performance or lack of connection. This paper provides a real-time status monitoring and channel error diagnosis method in a wireless sensor network. It uses a poll and echo procedure to efficiently collect some physical layer and link layer statistics from both transmitter side and receiver side. A machine...
Non-orthogonal multiple access (NOMA) is a promising multiple access technique for 5G wireless technology. In this paper, we first discuss the fundamentals of uplink and downlink NOMA transmissions in a cellular system and outline their key distinctions in terms of implementation complexity, detection and decoding at the SIC receiver(s), and the intra-cell and inter-cell interferences. Later, for...
One of the key ingredients of Intelligent Transportation Systems (ITS) is delivery of broadcast status messages among vehicles for safety purposes. This requires an efficient Medium Access Control (MAC) that provides low average delay and high reliability. To this end, Carrier Sense Multiple Access (CSMA) has been commonly proposed for Vehicle Ad Hoc Networks (VANETs). Nevertheless, the hidden- node...
Pattern Division Multiple Access (PDMA) is a novel non-orthogonal multiple access scheme proposed to meet the demand of massive connection in the future 5G communications. PDMA is based on the joint design of transmitter and receiver. The multiuser signals are superposed on the multiple signal domains based on different characteristic patterns at the transmitter side, and the successive interference...
In this paper, pattern division multiple access with large-scale antenna array (LSA-PDMA) is proposed as a novel non-orthogonal multiple access (NOMA) scheme. In the proposed scheme, pattern is designed in both beam domain and power domain in a joint manner. At the transmitter, pattern mapping utilizes power allocation to improve the system sum rate and beam allocation to enhance the access connectivity...
This paper aims to evaluate the system level performance of the newly proposed non-orthogonal multiple access scheme sparse code multiple access (SCMA) with uplink grant-free transmissions for 5G massive machine-type communication (mMTC) scenario. The challenge lies in the modeling and abstraction of physical layer actions as the link-to-system interface, including the features of overloading, grant-free...
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