Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted non-orthogonal multiple access (NOMA) communication systems are investigated in its vicinity, where a STAR-RIS is deployed within predefined region for establishing links users. Both beamformer-based NOMA cluster-based schemes employed at the multi-antenna base station (BS). For each scheme, deploy...

In this article, we aim to minimize the total power of all Internet Things Devices (IoTDs) by jointly optimizing user association, computational capacity, transmit power, and location unmanned aerial vehicles (UAVs) in an UAV-assisted cloud radio access network (C-RAN). order solve nonconvex problem, propose effective algorithm solving four subproblems iteratively. For association capacity subp...

Due to its flexible deployment and high mobility of unmanned aerial vehicles (UAVs), the UAV-assisted cognitive radio (CR) network has attracted a lot attention as one most promising techniques address spectrum congestion issues in futuristic networks. However, performance can be severely affected by blocked line-of-sight (LoS) channel air-to-ground (A2G) links. In this paper, we propose UAV CR...

In this paper, a novel transmissive reconfigurable meta-surface (RMS) transceiver enabled multi-tier computing network architecture is proposed for improving capability, decreasing delay and reducing base station (BS) deployment cost, in which RMS equipped with feed antenna can be regarded as new type of multi-antenna system. We formulate total energy consumption minimization problem by joint o...

By reconfiguring the propagation environment of electromagnetic waves artificially, reconfigurable intelligent surfaces (RISs) have been regarded as a promising and revolutionary hardware technology to improve energy spectrum efficiency wireless networks. In this paper, we study RIS aided multiuser multiple-input multiple-output (MIMO) power transfer (WPT) system, where transmitter is equipped ...

Over-the-air computation (AirComp) has been recognized as a promising technique in Internet-of-Things (IoT) networks for fast data aggregation from large number of wireless devices. However, the accuracy AirComp highly depends on devices with worst channels condition, which degrades severely when becomes large. To address this issue, we exploit massive multiple-input multiple-output (MIMO) hybr...

In this work, we propose ultra-low-complexity design solutions for multi-group multicast beamforming in large-scale systems. For the quality-of-service (QoS) problem, by utilizing optimal structure obtained recently [2], convert original problem into a non-convex weight optimization of lower dimension and two fast first-order algorithms to solve it. Both are based on successive convex approxima...

The first moment and second central moments of the portfolio return, a.k.a. mean variance, have been widely employed to assess expected profit risk portfolio. Investors pursue higher lower variance when designing portfolios. two can well describe distribution return it follows Gaussian distribution. However, real world assets is usually asymmetric heavy-tailed, which far from being a asymmetry ...

Spatial beamforming is an efficient way to realize dual-functional radar-communication (DFRC). In this paper, we study the DFRC design for a general scenario, where base station (BS) simultaneously detects target as multiple-input-multiple-output (MIMO) radar while communicating with multiple multi-antenna communication users (CUs). This necessitates joint transceiver both MIMO and multi-user (...