TY  - JOUR
T1  - Subcarrier-Clearing Based Carrier Frequency Offset Estimation Scheme Robust to Heterogeneous Network Interference
AU  - Yeo, Yujin 
AU  - Kim, Juyeop 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2025
DA  - 2025/1/1
DO  - 10.7840/kics.2025.50.2.341
KW  - OFDM
KW  - Carrier frequency offset
KW  - interference
AB  - This study suggests an enhanced carrier frequency offset estimation method based on subcarrier clearing. In heterogeneous network environments where the coverage of two base stations overlaps, a UE receives signals not only from the serving cell but also from other cells. Signals transmitted from non-serving cells can cause interference that degrades the accuracy of CFO estimation of the serving cell signal. This study introduces a method to compensate the effects of interference cell signals on CFO estimation by utilizing the characteristics of subcarrier allocation. Through a USRP testbed, it is experimentally shown that the proposed scheme guarantees effectiveness in both CFO estimation and PBCH decoding improvement.