Multi-carrier communications based on generalized discrete fourier transform

• Main Author: Wang, Jian.
• Other Authors: Gong Yi
• Format: Final Year Project
• Language: English
• Published: 2012
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems
• Online Access: http://hdl.handle.net/10356/50880
• Institution: Nanyang Technological University

Generalized Discrete Fourier Transform (GDFT) with non-linear phase is a complex valued, constant modulus orthogonal function set. GDFT can be effectively used in Orthogonal Frequency Division Multiplexing (OFDM) and Code Division Multiple Access (CDMA) communication systems. In this report, the literature review is the prerequisite in understanding the whole project. It includes the Discrete Fourier Transform (DFT), the principles of CDMA, Walsh Code, Auto-correlation function and Cross-correlation function, Signal to Noise Ratio (SNR) and Bit Error Rate (BER). With the knowledge of those terms and applications, it’s easier in understanding the GDFT principles and specification. In addition, the results from the various research papers provided are constructive and supportive to the whole research for this project. As compared with Walsh Code or DFT, the researched results have shows the GDFT is the best solution in reduce inter carrier interference and inter-symbol interference. In addition, it presents that GDFT over DFT in improving BER performance in direct sequence CDMA as well, and the performance of GDFT in real-world communication scenarios will be investigated.