Outage probability computation in multi-backscatter systems with multi-modes of operation

Abstract

In this article, we study the outage performance of an ambient multi-backscatter system supported by non-orthogonal multiple access (NOMA) downlink transmission, where legacy users receive information either directly from the base station (BS) or from multiple backscatter devices (BDs) as well. Specifically, we characterize the network connections between the BS and network users into three modes of operation. In the first mode, the BS communicates with the users via the BDs by exploiting NOMA. In the second mode, the BS communicates directly with the users by employing selection combining (SC) beamforming. In the third mode, the users receive signals from both the BS and BDs simultaneously, by using maximal ratio combining (MRC) to combine the BS and BDs links at the users. Consequently, we derive the exact outage expressions of each mode and utilize Monte Carlo simulations to validate the individual exact expressions.

Throughput analysis of non-orthogonal multiple access and orthogonal multiple access assisted wireless energy harvesting K-hop relaying networks

“…A nearby user can be a relay to transfer the signal to the far user by taking advantage of the benefits of full-duplex mode, allowing the relay to transmit and receive signals at the same time. For efficient data transmission, the shadowing and fading effects of the channels also play an important role [32]- [34]. Additionally, reconfigurable intelligent surfaces (RIS) is an emerging technology that is combined with multiple antennas-aided wireless systems with the presence of NOMA to the assistance improvement of far user performance [35], [36].…”