To increase the number of subscribers in passive optical networks (PON), various multiple access schemes like time division multiple access (TDMA), frequency division multiple access (FDMA) and its special form orthogonal FDMA (OFDMA) can be used [1]. OFDMA is spectrally efficient and allows adaption to the channel and traffic demand by flexible bitand power-loading. The uplink (UL) direction i...

Long Term Evolution (LTE) is the latest standard proposed by the 3GPP towards 4G. This paper uses an accurate perform analysis of complete uplink LTE study. Multiple input multiple output (MIMO) techniques have gathered much attention in recent years as a way to improve drastically the performance of wireless mobile communications. Simulated Results compare different channel estimation techniqu...

A current trend in the evolution of mobile communication networks consists integrating Non-Terrestrial Networks (NTN) with Terrestrial ones. One option to implement NTN part this hybrid architecture using Unmanned Aerial Vehicles (UAV) that relay uplink radio signals through optical wireless backhaul links. good choice for waveform is conventional SC-FDMA, which mitigates PAPR and enables a lon...