Abstract

The study investigates physical layer strategies rooted in 5G new radio (NR) to help much-speed connectivity and emerging 6G non-terrestrial network (NTNs). The use of MATLAB-based simulation. We examine the bit error rates of an performance of several modulation schemes data such as QPSK, 16 QAM, OTFS and, FBMC across diverse channel conditions such as AWGN, Raytleign and Rician fading. The analysis assumes ideal channel state information stands for (CSI) at the receiver. We compare traditional modulation formats (QPSK and 16 QAM) with more advanced alternatives of OTFS and FBMC to assess their resilience to noise and multipath effects. The results of the output show that OTFS and FBMC consistently outperformed conventional schemes. especially in dynamic feeding scenarios, offering lower BER and greater robustness. These insight highlight their suitability for integration into the future 6G NTN system. Where dependable and high throughout links are essential for seamless communication across space, air and ground domains.