In this paper, we study uplink-downlink non-orthogonal multiple access (NOMA) systems by considering the secure performance at physical layer. considered system model, base station acts a relay to allow two users left side communicate with right side. By imperfect channel state information (CSI), need be studied since an eavesdropper wants overhear signals processed downlink. To provide metric,...

In this paper, we analyze and evaluate the impacts of imperfect channel state information (CSI) short packet communication (SPC) in a non-orthogonal multiple access (NOMA) visible light (VLC) system. We consider downlink NOMA VLC system, which one emitting diode (LED) serves two single-photodiode users with estimation error. To end, derive closed-form expression for block error rate (BLER) CSI ...

Abstract In heterogeneous V2X networks, the channel state information (CSI) undergoes rapid fluctuations owing to dynamic mobility of vehicles. Therefore, it is important redevelop a more suitable description for resource allocation in vehicular communications. this paper, we concentrate on effect imperfect CSI with practical achieve maximum energy efficiency (EE) vehicle-to-vehicle (V2V) links...

this paper concerns the transmission of two independent gaussian sources over a two-user decentralized interference channel, assuming that the transmitters are unaware of the instantaneous csis. the availability of the channel state information at receivers (csir) is considered in two scenarios of perfect and imperfect csir. in the imperfect csir case, we consider a more practical assumption of...

Previous research efforts on OFDMA resource allocation have typically assumed the availability of perfect channel state information (CSI). Unfortunately, this is unrealistic, primarily due to channel estimation errors, and more importantly, channel feedback delay. In this paper, we develop optimal resource allocation algorithms for OFDMA systems assuming the availability of only partial (imperf...

Multiuser scheduling is an important aspect in the performance optimization of a wireless network since it allows multiple users to access a shared channel efficiently by exploiting multiuser diversity. To perform efficient scheduling, channel state information (CSI) for users is required, and is obtained via their respective feedback channels. In this paper, a more realistic imperfect CSI feed...