Frequency Synchronization in Filter Bank Multicarrier and Generalized Frequency Division Multiplexing

Abstract

Filter Bank Multicarrier and Generalized Frequency Division Multiplexing are being considered as the major candidates for the 5G modulation schemes. Owing to some basic limitations such as the out of band spectral leakage which in turn creates a lot of anomalies, Orthogonal Frequency Division Multiplexing will be replaced with a new waveform design for 5G applications. Proposed 5G modulation schemes are also prone to degradation in performance due to the carrier frequency offset. Carrier frequency offset introduces Inter Carrier Interference causing degradation in the Bit Error Rate performance. It is extremely critical to estimate and compensate this channel induced and / or oscillator generated offset at the receiver end for correct deciphering of the transmitted data. This research effort initially focuses on the in-depth investigation of the effect of various system parameters on the BER performance of Filter Bank Multicarrier and Generalized Frequency Division Multiplexing. A detailed performance analysis of the considered modulation scheme along with OFDM is presented for AWGN and frequency selective multipath Rayleigh fading channels. This thesis also presents a detailed literature review on different data aided and non-data aided carrier frequency offset estimation algorithms. Finally, a modified maximum likelihood data aided estimation method is implemented. Results are simulated using MATLAB and error performance is compared with Cramer Rao Lower Bound for either modulation scheme. Performance for the simulated algorithm is also tested and presented in the six variants of the Stanford University Interim channel models. Results of the simulated algorithm are also compared with existing carrier frequency offset estimation algorithms for Filter Bank Multicarrier and Generalized Frequency Division Multiplexing modulation schemes.