This paper considers an angle-domain intelligent reflecting surface (IRS) system. We derive maximum likelihood (ML) estimators for the effective angles from base station (BS) to user and of propagation IRS user. It is demonstrated that accuracy estimated improves with number BS antennas. Also, deploying closer increases angle Then, based on angles, we propose a joint optimization beamforming be...

This paper investigates intelligent reflecting surface (IRS) enabled non-line-of-sight (NLoS) wireless sensing, in which an IRS is dedicatedly deployed to assist access point (AP) sense a target at its NLoS region. It assumed that the AP equipped with multiple antennas and uniform linear array. We consider two types of models, namely extended targets, for aims estimate target's direction-of-arr...

This paper investigates intelligent reflecting surface based backscatter communication (IRS-BackCom), in order to realize computational task offloading of energy-constrained mobile edge computing network a self-sustainable manner. Specifically, the system operation is divided into two phases. In first one, ambient signal energy from power beacon (PB) either provides supply local and harvesting ...

Reconfigurable intelligent surface (RIS) based communications have emerged as a new paradigm. This letter proposes differential reflecting modulation (DRM) scheme for RIS communication systems. In DRM, information bits are jointly carried by the activation permutations of patterns and phases transmitted signals, leading to that DRM can work without any channel state (CSI) at transmitter, or rec...

In this letter, we consider a multicast system where single-antenna transmitter sends common message to multiple users, aided by an intelligent reflecting surface (IRS) equipped with N passive elements. Prior works on IRS have mostly assumed the availability of channel state information (CSI) for designing its beamforming. However, acquisition CSI requires substantial training overhead that inc...

This paper considers a secure multigroup multicast multiple-input single-output (MISO) communication system aided by an intelligent reflecting surface (IRS). Specifically, we aim to minimize the transmit power at Alice via jointly optimizing beamformer, artificial noise (AN) vector and phase shifts IRS subject secrecy rate constraints as well unit modulus of shifts. To tackle optimization probl...

In this paper, we explore the impacts of utilizing intelligent reflecting surfaces (IRS) in a power-splitting based simultaneous wireless information and power transfer (PS-SWIPT) system and compare its performance with the traditional decode and forward relaying system. To analyze a more practical system, it is also assumed that the receiving nodes are subject to decoding cost, and they are on...

Pilot contamination attack (PCA) in a time division duplex wireless communication system is considered, where an eavesdropper (Eve) attacks the reverse pilot transmission phase order to wiretap data transmitted from transmitter, Alice, receiver, Bob. We propose new PCA scheme for Eve, wherein Eve does not emit any signal by itself but uses intelligent reflecting surface (IRS) reflect sent Bob A...