The conflation of cognitive radio (CR) and nonorthogonal multiple access (NOMA) concepts is a promising approach to fulfil the massive connectivity goals future networks given spectrum scarcity. Accordingly, this letter investigates outage performance imperfect cooperative CR-NOMA under hardware impairments interference. Our analysis involved with derivation end-to-end probability (OP) for seco...

Intelligent reflecting surface (IRS) is a promising new paradigm to achieve high spectral and energy efficiency for future wireless networks by reconfiguring the signal propagation via passive reflection. To reap gains of IRS, channel state information (CSI) essential, whereas estimation errors are inevitable in practice due limited training resources. In this paper, order optimize performance ...

Reconfigurable intelligent surface (RIS) or reflecting (IRS) has recently been envisioned as one of the most promising technologies in future sixth-generation (6G) communications. In this letter, we consider joint optimization transmit beamforming at base station (BS) and phase shifts RIS for an RIS-aided wireless communication system with both hardware impairments imperfect channel state infor...