Enhancing 5G Cellular Communications: A Comparative Analysis of OTFS and GFDM Multiple Access Schemes

Abstract

The primary goal of 5G cellular communications is to facilitate high-speed data transmission, increased channel capacity, and superior quality of service. Achieving these objectives hinges on the selection of appropriate multiplexing techniques. Among the various options available, Orthogonal Time Frequency Space (OTFS) and Generalized Frequency Division Multiplexing (GFDM) stand out as prominent choices. OTFS modulation employs a unique two-dimensional approach, utilizing delay-Doppler techniques for information symbol multiplexing. Compared to conventional methods, OTFS and GFDM offer improved performance in terms of Bit Error Rate (BER) and Peak to Average Power Ratio (PAPR), owing to pre and post-processing operations in OTFS and Pulse Shaping Filters in GFDM. This paper conducts a comparative analysis between existing multiple access schemes such as UFMC and FBMC, and proposed techniques like GFDM and OTFS. It evaluates various criteria including power spectral density, spectral efficiency, and BER and PAPR performance. A key highlight of this study is the PAPR analysis of OTFS, along with the utilization of the Modified Bartlett Hanning Filter (MBHF) as the Pulse Shaping Filter in GFDM analysis.