69 citations · 252 across the 66 of their papers we have counts for
55 papers · 1 filter
Rate Loss Analysis for Multiple-Antenna NOMA with Limited Feedback
Ruizhan Shen, Hamid Jafarkhani
In the limited feedback downlink multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) system, both the effective channel gain and the channel direction need to…
Optimizing Cellular Networks for UAV Corridors via Quantization Theory
Saeed Karimi-Bidhendi, Giovanni Geraci, Hamid Jafarkhani
We present a new framework based on quantization theory to design cellular networks optimized for both legacy ground users and uncrewed aerial vehicle (UAV) corridors, dedicated ae…
Reconfigurable Intelligent Surface-Aided NOMA with Limited Feedback
Mojtaba Ahmadi Almasi, Hamid Jafarkhani
The design of feedback channels in frequency division duplex (FDD) systems is a major challenge because of the limited available feedback bits. We consider non-orthogonal multiple…
Analysis of UAV Corridors in Cellular Networks
Saeed Karimi-Bidhendi, Giovanni Geraci, Hamid Jafarkhani
In this article, we introduce a new mathematical framework for the analysis and design of UAV corridors in cellular networks, while considering a realistic network deployment, ante…
Node Deployment in Heterogeneous Rayleigh Fading Sensor Networks
Saeed Karimi-Bidhendi, Hamid Jafarkhani
We study a hierarchical heterogeneous Rayleigh fading wireless sensor network (WSN) in which sensor nodes surveil a region of interest (RoI) and use access points (APs) as relays t…
Reconfigurable Intelligent Surface-Assisted mmWave multi-UAV Wireless Cellular Networks
Lisi Jiang, Hamid Jafarkhani
Unmanned aerial vehicles (UAVs) have brought a lot of flexibility in the network deployment. However, UAVs suffer from the high mobility and instability. To improve the capacity an…
Storage Codes with Flexible Number of Nodes
Weiqi Li, Zhiying Wang, Taiting Lu +1
This paper presents flexible storage codes, a class of error-correcting codes that can recover information from a flexible number of storage nodes. As a result, one can make a bett…
Low-Complexity Dynamic Resource Scheduling for Downlink MC-NOMA Over Fading Channels
Do-Yup Kim, Hamid Jafarkhani, Jang-Won Lee
In this paper, we investigate dynamic resource scheduling (i.e., joint user, subchannel, and power scheduling) for downlink multi-channel non-orthogonal multiple access (MC-NOMA) s…
Energy-Efficient Node Deployment in Static and Mobile Heterogeneous Multi-Hop Wireless Sensor Networks
Saeed Karimi-Bidhendi, Jun Guo, Hamid Jafarkhani
We study a heterogeneous wireless sensor network (WSN) where N heterogeneous access points (APs) gather data from densely deployed sensors and transmit their sensed information to…
Energy-Efficient Node Deployment in Heterogeneous Two-Tier Wireless Sensor Networks with Limited Communication Range
Saeed Karimi-Bidhendi, Jun Guo, Hamid Jafarkhani
We study a heterogeneous two-tier wireless sensor network in which N heterogeneous access points (APs) collect sensing data from densely distributed sensors and then forward the da…
Downlink Asynchronous Non-Orthogonal Multiple Access with Quantizer Optimization
Xun Zou, Mehdi Ganji, Hamid Jafarkhani
In this letter, we study a two-user downlink asynchronous non-orthogonal multiple access (ANOMA) with limited feedback. We employ the max-min criterion for the power allocation and…
Coverage Analysis of Relay Assisted Millimeter Wave Cellular Networks with Spatial Correlation
Simin Xu, Nan Yang, Biao He +1
We propose a novel analytical framework for evaluating the coverage performance of a millimeter wave (mmWave) cellular network where idle user equipments (UEs) act as relays. In th…
Trellis-Coded Non-Orthogonal Multiple Access
Xun Zou, Mehdi Ganji, Hamid Jafarkhani
In this letter, we propose a trellis-coded nonorthogonal multiple access (NOMA) scheme. The signals for different users are produced by trellis coded modulation (TCM) and then supe…
Optimal deployments of UAVs with directional antennas for a power-efficient coverage
Jun Guo, Philipp Walk, Hamid Jafarkhani
To provide a reliable wireless uplink for users in a given ground area, one can deploy Unmanned Aerial Vehicles (UAVs) as base stations (BSs). In another application, one can use U…
MmWave Amplify-and-Forward MIMO Relay Networks with Hybrid Precoding/Combining Design
Lisi Jiang, Hamid Jafarkhani
In this paper, we consider the amplify-and-forward relay networks in mmWave systems and propose a hybrid precoder/combiner design approach. The phase-only RF precoding/combining ma…
Space-Time Signal Design for Multilevel Polar Coding in Slow Fading Broadcast Channels
Hossein Khoshnevis, Ian Marsland, Hamid Jafarkhani +1
Slow fading broadcast channels can model a wide range of applications in wireless networks. Due to delay requirements and the unavailability of the channel state information at the…
Energy Efficient Node Deployment in Wireless Ad-hoc Sensor Networks
Jun Guo, Saeed Karimi-Bidhendi, Hamid Jafarkhani
We study a wireless ad-hoc sensor network (WASN) where sensors gather data from the surrounding environment and transmit their sensed information to fusion centers (FCs) vi…
Cooperative Asynchronous Non-Orthogonal Multiple Access with Power Minimization Under QoS Constraints
Xun Zou, Mehdi Ganji, Hamid Jafarkhani
Recent studies have demonstrated the superiority of non-orthogonal multiple access (NOMA) over orthogonal multiple access (OMA) in cooperative communication networks. In this paper…
MOCZ for Blind Short-Packet Communication: Some Practical Aspects
Philipp Walk, Peter Jung, Babak Hassibi +1
We will investigate practical aspects for a recently introduced blind (noncoherent) communication scheme, called modulation on conjugate-reciprocal zeros (MOCZ), which enables reli…
Using Quantization to Deploy Heterogeneous Nodes in Two-Tier Wireless Sensor Networks
Saeed Karimi-Bidhendi, Jun Guo, Hamid Jafarkhani
We study a heterogeneous two-tier wireless sensor network in which N heterogeneous access points (APs) collect sensing data from densely distributed sensors and then forward the da…
Quantizers with Parameterized Distortion Measures
Jun Guo, Philipp Walk, Hamid Jafarkhani
In many quantization problems, the distortion function is given by the Euclidean metric to measure the distance of a source sample to any given reproduction point of the quantizer.…
Novel Time Asynchronous NOMA schemes for Downlink Transmissions
Mehdi Ganji, Hamid Jafarkhani
In this work, we investigate the effect of time asynchrony in non-orthogonal multiple access (NOMA) schemes for downlink transmissions. First, we analyze the benefit of adding inte…
Low-Complexity Reconfigurable MIMO for Millimeter Wave Communications
Biao He, Hamid Jafarkhani
The performance of millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems is limited by the sparse nature of propagation channels and the restricted number of radio…
Interleaving Channel Estimation and Limited Feedback for Point-to-Point Systems with a Large Number of Transmit Antennas
Erdem Koyuncu, Xun Zou, Hamid Jafarkhani
We introduce and investigate the opportunities of multi-antenna communication schemes whose training and feedback stages are interleaved and mutually interacting. Specifically, unl…