Tianshu Li's research while affiliated with Shanghai Normal University and other places

Publications (4)

Preprint
Full-text available
In this letter, we investigate a reconfigurable intelligent surfaces (RIS)-aided device to device (D2D) communication system over Rician fading channels with imperfect hardware including both hardware impairment at the transceivers and phase noise at the RISs. This paper has optimized the phase shift by a genetic algorithm (GA) method to maximize t...
Article
In this paper, we investigate a reconfigurable intelligent surface (RIS) aided multi-pair communication system, in which multi-pair users exchange information via an RIS. We derive an approximate expression for the achievable rate by assuming that statistical channel state information (CSI) is available. A genetic algorithm (GA) to solve the rate m...
Preprint
Full-text available
In this paper, we investigate an intelligent reflecting surface (IRS) assisted multi-pair communication system, in which multiple pairs of users exchange information via an IRS. We derive an approximate expression for the achievable rate when only statistical channel state information (CSI) is available. Then, a genetic algorithm (GA) is proposed t...

Citations

... Recently, the joint beamforming and phase shift design was studied in a RIS-aided physical layer security system in [11]. Besides the transceiver hardware impairment, the authors of [12] further considered the impact of the phase noise at the RIS and derived the closedform data rate expression, based on which the genetic algorithm was adopted to solve the phase shift optimization problem. In [13], the RIS-aided communication system for serving a mobile user was studied, and the authors proposed an interesting algorithm to predict the positions of the user under HWI. ...
... Note that all the above mentioned works require instantanenous CSI; however, the channel estimation overhead and computational complexity of instantaneous CSI acquisition are usually high. Therefore, some recent works, such as [8]- [11], advocated to utilize statistical CSI to design the phase shift of RIS. In this context, [8] considered a multi-user system and utilized longterm angular information to design the phase shift, while [9] provided a closed-form expression for the optimal phase shift. ...