Performance of Universal Filter Multi Carrier in the presence of Carrier Frequency Offset

Abstract

Universal Filtered Multi-Carrier (UFMC) is a Non Orthogonal Multiple Access (NOMA) waveform technology for 5G wireless systems, and it combines the simplicity of Orthogonal Frequency Division Multiplexing (OFDM) with the advantage of Filter Bank Multi Carrier (FBMC). UFMC is an alternative multicarrier scheme to FBMC, in which the filtering is done for group of subcarriers instead of single subcarrier. It is a multi-carrier scheme based on sub-band-wise filtering operation for asynchronous operations. Filtering operation reduces out-of-band side lobe levels and subsequently minimizes the Inter-Carrier Interference (ICI) between adjacent users. In synchronous communication systems due to equipment imperfections and Doppler shift, it is impossible to have perfect carrier frequency knowledge. In this paper, the impact of Carrier Frequency Offset (CFO) of the UFMC system is examined and the results are compared with the performance of Cyclic Prefix based Orthogonal Frequency Division Multiplexing (CP-OFDM) systems with different detection techniques like Zero Forcing (ZF), Minimum Mean Square Error (MMSE). UFMC systems is extended to Multi user (MU)-UFMC and MIMO — UFMC with optimal detection technique and evaluated the performance by calculating Symbol Error Rate (SER) with respect to Signal to Noise Ratio (SNR). The SER performance shows that for different communication environments, UFMC system is better than OFDM for single user and multi user. UFMC with MMSE detection technique outperforms the OFDM in case of Multi User (MU) — UFMC and MU-MIMO — UFMC.