학술논문
An Implementation of a Low Complexity Integer Carrier Frequency Offset estimator for OFDM
Document Type
Conference
Author
Source
2022 IEEE International Symposium on Circuits and Systems (ISCAS) Circuits and Systems (ISCAS), 2022 IEEE International Symposium on. :1695-1698 May, 2022
Subject
Language
ISSN
2158-1525
Abstract
Uncertainty in local oscillators and the doppler shift effect can cause frequency errors in OFDM systems. Frequency errors, often referred to as Carrier Frequency Offsets (CFO), can be divided into two categories: fractional frequency offset (FCO), which causes Inter-Carrier Interference (ICI) and destroys the orthogonality between carriers, and Integer Carrier Frequency Offset (ICFO), that causes a cyclic shift in carriers. This work presents the analysis and implementation of a robust and simple Integer Carrier Frequency Offset estimator involving the DFT computation for Orthogonal Frequency Division Multiplexing (OFDM) systems. It is designed for the IEEE802.15.4g standard and synthetized in FPGA, achieving improved performance and savings of up to 70% in registers and 39% in combinational logic when compared to a similar method.