Search Results for author: Tiejun Lv

Found 14 papers, 0 papers with code

Intelligent Reflecting Surfaces and Next Generation Wireless Systems

no code implementations26 Feb 2024 Yashuai Cao, Hetong Wang, Tiejun Lv, Wei Ni

Intelligent reflecting surface (IRS) is a potential candidate for massive multiple-input multiple-output (MIMO) 2. 0 technology due to its low cost, ease of deployment, energy efficiency and extended coverage.

Multi-Carrier NOMA-Empowered Wireless Federated Learning with Optimal Power and Bandwidth Allocation

no code implementations13 Feb 2023 Weicai Li, Tiejun Lv, Yashuai Cao, Wei Ni, Mugen Peng

Wireless federated learning (WFL) undergoes a communication bottleneck in uplink, limiting the number of users that can upload their local models in each global aggregation round.

Federated Learning

Digital Twin-Aided Learning for Managing Reconfigurable Intelligent Surface-Assisted, Uplink, User-Centric Cell-Free Systems

no code implementations10 Feb 2023 Yingping Cui, Tiejun Lv, Wei Ni, Abbas Jamalipour

This paper puts forth a new, reconfigurable intelligent surface (RIS)-assisted, uplink, user-centric cell-free (UCCF) system managed with the assistance of a digital twin (DT).

On Secure Uplink Transmission in Hybrid RF-FSO Cooperative Satellite-Aerial-Terrestrial Networks

no code implementations12 Oct 2022 Yuanyuan Ma, Tiejun Lv, Gaofeng Pan, Yunfei Chen, Mohamed-Slim Alouini

Considering the randomness of R, D, and Eves, and employing a stochastic geometry framework, the secrecy outage performance of the cooperative uplink transmission in the considered SATN is investigated and a closed-form analytical expression for the end-to-end secrecy outage probability is derived.

Multi-Agent Deep Reinforcement Learning for Cost- and Delay-Sensitive Virtual Network Function Placement and Routing

no code implementations24 Jun 2022 Shaoyang Wang, Chau Yuen, Wei Ni, Guan Yong Liang, Tiejun Lv

Then, the joint VNF P&R problem is decoupled into two iterative subtasks: placement subtask and routing subtask.

Effect of Strong Time-Varying Transmission Distance on LEO Satellite-Terrestrial Deliveries

no code implementations11 Jun 2022 Yuanyuan Ma, Tiejun Lv, TingTing Li, Gaofeng Pan, Yunfei Chen, Mohamed-Slim Alouini

In this paper, we investigate the effect of the strong time-varying transmission distance on the performance of the low-earth orbit (LEO) satellite-terrestrial transmission (STT) system.

Joint Resource Management for MC-NOMA: A Deep Reinforcement Learning Approach

no code implementations29 Mar 2021 Shaoyang Wang, Tiejun Lv, Wei Ni, Norman C. Beaulieu, Y. Jay Guo

This paper presents a novel and effective deep reinforcement learning (DRL)-based approach to addressing joint resource management (JRM) in a practical multi-carrier non-orthogonal multiple access (MC-NOMA) system, where hardware sensitivity and imperfect successive interference cancellation (SIC) are considered.

Management reinforcement-learning +1

Tensor-based Multi-dimensional Wideband Channel Estimation for mmWave Hybrid Cylindrical Arrays

no code implementations10 Sep 2020 Zhipeng Lin, Tiejun Lv, Wei Ni, J. Andrew Zhang, Ren Ping Liu

Channel estimation is challenging for hybrid millimeter wave (mmWave) large-scale antenna arrays which are promising in 5G/B5G applications.

Signal Processing

Complex ResNet Aided DoA Estimation for Near-Field MIMO Systems

no code implementations21 Jul 2020 Yashuai Cao, Tiejun Lv, Zhipeng Lin, Pingmu Huang, Fuhong Lin

By converting it into a regression task, a novel DoA estimation framework based on complex-valued deep learning (CVDL) is proposed for the near-field region in short-range MIMO communication systems.

Signal Processing

Analysis and Optimization of Service Delay for Multi-quality Videos in Multi-tier Heterogeneous Network with Random Caching

no code implementations21 Jul 2020 Xuewei Zhang, Tiejun Lv, Yuan Ren, Wei Ni, Norman C. Beaulieu

Aiming to minimize service delay, we propose a new random caching scheme in device-to-device (D2D)-assisted heterogeneous network.

Nested Hybrid Cylindrical Array Design and DoA Estimation for Massive IoT Networks

no code implementations20 Jul 2020 Zhipeng Lin, Tiejun Lv, Wei Ni, J. Andrew Zhang, Ren Ping Liu

As a result, only a small number of RF chains are required to preserve the DoF of the UCyA.

Intelligent Reflecting Surface Aided Multi-User Millimeter-Wave Communications for Coverage Enhancement

no code implementations6 Oct 2019 Yashuai Cao, Tiejun Lv, Wei Ni

Intelligent reflecting surface (IRS) is envisioned as a promising solution for controlling radio propagation environments in future wireless systems.

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