Date of Award

2-1-2025

Publication Type

Thesis

Degree Name

M.A.Sc.

Department

Electrical and Computer Engineering

Supervisor

Behnam Shahrrava

Rights

info:eu-repo/semantics/embargoedAccess

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is extensively utilized in LTE and 5G networks but faces challenges with high Peak to Average Power Ratio (PAPR) in uplink communication. For this, single-carrier schemes like DFT spread OFDM (DFT-s-OFDM) and DCT spread OFDM (DCT-s-OFDM) have been proposed. However, these methods suffer from redundancy and energy inefficiency due to the cyclic prefix (CP) which is mainly used to mitigate intersymbol interference (ISI). Alternatives like Zero-Tail DFT-s-OFDM aim to eliminate the CP but do not achieve the optimal performance of CP-OFDM due to ISI. Furthermore, the role of subcarrier mapping on Zero-Tail DFT-s-OFDM remains unexplored in the existing literature. The first part of this thesis aims to investigate the application of zero-tail and zero-head techniques for DFT-s-OFDM using two subcarrier mapping schemes (Localized and Interleaved). It has been observed that localized mapping necessitates a zero-head for acceptable error performance. In contrast, interleaved subcarrier mapping substantially improves error performance and obviates the necessity for zero-head to mitigate ISI, while concurrently minimizing transmitter complexity to a great extent. In the second part of the study, the main goal was to replicate the implementations of Zero-Tail DFT-s-OFDM for DCT-s-OFDM to compare their characteristics, including different DCT types. The Bit Error Rate (BER) and PAPR characteristics of Zero-Tail DFT-s-OFDM and Zero-Tail DCT-s-OFDM were evaluated for different subcarrier mapping schemes. It was found that Zero-Tail DCT-s-OFDM often outperforms its DFT counterpart, despite the increased complexity at the receiver.

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