Energy beamforming has emerged as a promising technique for enhancing the energy transfer efficiency of radio-frequency (RF) enabled wireless power (WPT). However, performance conventional may seriously degrade due to non-linear RF direct current (DC) conversion at receivers (ERs). To tackle this issue, letter proposes new time-division scheme, in which different matrices (of high ranks general...

In this manuscript, we present an energy-efficient alternating optimization framework based on the multi-antenna ambient backscatter communication (AmBSC) assisted cooperative non-orthogonal multiple access (NOMA) for next-generation (NG) internet-of-things (IoT) enabled networks. Specifically, energy-efficiency maximization is achieved considered AmBSC-enabled multi-cluster IoT NOMA system by ...

In this paper, we consider an energy efficient resource allocation technique for a hybrid time division multiple access (TDMA) - non-orthogonal (NOMA) system. such system, the available transmission is divided into several sub-time slots, and slot allocated to serve group of users (i.e., cluster). Furthermore, signals in each cluster are transmitted based on NOMA approach. With NOMA, can be ser...

For the problems brought by malicious interference in unmanned aerial vehicle (UAV) swarm network, we establish a cluster-based UAV information transmission model. We mainly consider four aspects: cluster head selection, channel allocation, power allocation and position. In order to improve backhaul rate of swarm, propose joint optimization method spectrum resource with goal maximizing sum thro...

In practice, residual transceiver hardware impairments inevitably lead to distortion noise which causes the performance loss. this letter, we study robust transmission design for a reconfigurable intelligent surface (RIS)-aided secure communication system in presence of impairments. We aim maximizing secrecy rate while ensuring transmit power constraint on active beamforming at base station and...

Unmanned aerial vehicle (UAV) enabled Internet of Things (IoT) can keep network connectivity when the ground infrastructures are paralyzed. However, its transmission perform will be restricted due to limited energy UAV. In this paper, a multi-UAV IoT is proposed, where UAVs as base stations send information nodes via downlink within flight time. And fair energy-efficient resource optimization s...

In this paper, we discuss the security and reliability performance of a communication system, where base station (BS) transmits signals to multiple users an unmanned aerial vehicle (UAV) jammer sends friendly jamming protect against full-duplex active eavesdropper with aid caching. We derive closed-form expressions outage probability (OP) intercept (IP) for legitimate eavesdropper, respectively...

The degrees of freedom (DoFs) attained in monostatic integrated sensing and communications (ISAC) are analyzed. Specifically, aims for extracting target-orientation information from the line sight (LoS) channel between transmitter target, since Non-LoS (NLoS) paths only contain clutter or interference. By contrast, wireless communications, typically, both LoS NLoS exploited achieving diversity ...

This paper aims to investigate the benefit of using intelligent reflecting surface (IRS) in multi-user multiple-input single-output (MU-MISO) systems, presence eavesdroppers. We maximize weighted sum secrecy rate by jointly designing secure beamforming (BF), artificial noise (AN), as well phase shift IRS. An alternating optimization (AO) method is proposed deal with formulated non convex proble...

In this paper, a reconfigurable intelligent surface (RIS)-aided millimeter wave (mmWave) non-orthogonal multiple access (NOMA) system is analyzed. particular, we consider an RIS-aided mmWave-NOMA downlink with hybrid beamforming structure. To maximize the achievable sum-rate under minimum rate constraint for users and maximum transmit power constraint, joint RIS phase shifts, beamforming, alloc...