The growing demand for high-speed and efficient wireless communication systems has led to the development of advanced modulation techniques like DFT-s-OFDM, particularly for uplink scenarios in 5G networks. This study investigates DFT-s-OFDM as an effective technique for reducing Peak-to-Average Power Ratio (PAPR) with lower complexity, making it well-suited for high-speed wireless communication systems. Through a systematic literature review (SLR), the study identified the most suitable subcarrier mapping method (localized and distributed ) for further optimization. The proposed FFT-less DFT-s-OFDM model was developed to achieve additional complexity reduction in DFT-s-OFDM. A comparative analysis was then conducted to evaluate the performance of the proposed model against the standard DFT-s-OFDM model using key metrics such as PAPR, Error Vector Magnitude (EVM), and Power Spectral Density (PSD).