On the design of an OFDMA-based software-defined modem: A CFO estimation perspective
Carrier Frequency Offset (CFO) is critical to the decoder performance of an Orthogonal Frequency Division Multiple Access (OFDMA) system and the conventional research works have coped with this issue. On the other hand, excessive enhancement of the estimation accuracy causes redundant computational...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-02-01
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| Series: | ICT Express |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S240595952300139X |
| _version_ | 1797305225138143232 |
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| author | Minkyeong Jeong Sang Won Choi Juyeop Kim |
| author_facet | Minkyeong Jeong Sang Won Choi Juyeop Kim |
| author_sort | Minkyeong Jeong |
| collection | DOAJ |
| description | Carrier Frequency Offset (CFO) is critical to the decoder performance of an Orthogonal Frequency Division Multiple Access (OFDMA) system and the conventional research works have coped with this issue. On the other hand, excessive enhancement of the estimation accuracy causes redundant computational complexity, which is not desirable for SoftWare (SW) defined modems that solely conduct signal processing in a software environment. In this paper, we propose a design methodology of a two-step CFO estimator that controls a specific level of estimation accuracy and computational complexity in the SW defined modem. Based on a generalized numerical model of the estimation accuracy in a noisy environment, we provide how to design coarse and fine CFO estimators that meet the target level of estimation accuracy. To evaluate its validity, we constructed a SW defined modem testbed system that can estimate CFO in a real-time environment. The two-step CFO estimator suitable to a Long Term Evolution (LTE) Physical Broadcast CHannel (PBCH) decoder is implemented on the testbed based on the design methodology. The results show that the two-step CFO estimator is designed properly to operate in various Signal to Noise Ratio (SNR) regimes, maximizing the performance of the PBCH decoder. |
| first_indexed | 2024-03-08T00:22:50Z |
| format | Article |
| id | doaj.art-587700659194403ab72f64959138b4d7 |
| institution | Directory Open Access Journal |
| issn | 2405-9595 |
| language | English |
| last_indexed | 2024-03-08T00:22:50Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | ICT Express |
| spelling | doaj.art-587700659194403ab72f64959138b4d72024-02-16T04:29:48ZengElsevierICT Express2405-95952024-02-01101184193On the design of an OFDMA-based software-defined modem: A CFO estimation perspectiveMinkyeong Jeong0Sang Won Choi1Juyeop Kim2Department of Electrical Engineering, Yonsei University, Seoul, Republic of Korea; Department of Electrical Engineering, Kyonggi University, Suwon, Republic of Korea; Department of Electrical Engineering, Sookmyung Women’s University, Seoul, Republic of KoreaCorrespondence to: School of Electronic Engineering, Kyonggi University, Gyeonggi-do, Republic of Korea.; Department of Electrical Engineering, Yonsei University, Seoul, Republic of Korea; Department of Electrical Engineering, Kyonggi University, Suwon, Republic of Korea; Department of Electrical Engineering, Sookmyung Women’s University, Seoul, Republic of KoreaCorresponding author at: Department of Electrical Engineering, Sookmyung Women’s University, Seoul, Republic of Korea.; Department of Electrical Engineering, Yonsei University, Seoul, Republic of Korea; Department of Electrical Engineering, Kyonggi University, Suwon, Republic of Korea; Department of Electrical Engineering, Sookmyung Women’s University, Seoul, Republic of KoreaCarrier Frequency Offset (CFO) is critical to the decoder performance of an Orthogonal Frequency Division Multiple Access (OFDMA) system and the conventional research works have coped with this issue. On the other hand, excessive enhancement of the estimation accuracy causes redundant computational complexity, which is not desirable for SoftWare (SW) defined modems that solely conduct signal processing in a software environment. In this paper, we propose a design methodology of a two-step CFO estimator that controls a specific level of estimation accuracy and computational complexity in the SW defined modem. Based on a generalized numerical model of the estimation accuracy in a noisy environment, we provide how to design coarse and fine CFO estimators that meet the target level of estimation accuracy. To evaluate its validity, we constructed a SW defined modem testbed system that can estimate CFO in a real-time environment. The two-step CFO estimator suitable to a Long Term Evolution (LTE) Physical Broadcast CHannel (PBCH) decoder is implemented on the testbed based on the design methodology. The results show that the two-step CFO estimator is designed properly to operate in various Signal to Noise Ratio (SNR) regimes, maximizing the performance of the PBCH decoder.http://www.sciencedirect.com/science/article/pii/S240595952300139XCarrier Frequency Offset (CFO)Estimation accuracySW defined modemTwo-step CFO estimator |
| spellingShingle | Minkyeong Jeong Sang Won Choi Juyeop Kim On the design of an OFDMA-based software-defined modem: A CFO estimation perspective ICT Express Carrier Frequency Offset (CFO) Estimation accuracy SW defined modem Two-step CFO estimator |
| title | On the design of an OFDMA-based software-defined modem: A CFO estimation perspective |
| title_full | On the design of an OFDMA-based software-defined modem: A CFO estimation perspective |
| title_fullStr | On the design of an OFDMA-based software-defined modem: A CFO estimation perspective |
| title_full_unstemmed | On the design of an OFDMA-based software-defined modem: A CFO estimation perspective |
| title_short | On the design of an OFDMA-based software-defined modem: A CFO estimation perspective |
| title_sort | on the design of an ofdma based software defined modem a cfo estimation perspective |
| topic | Carrier Frequency Offset (CFO) Estimation accuracy SW defined modem Two-step CFO estimator |
| url | http://www.sciencedirect.com/science/article/pii/S240595952300139X |
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