On the design of an OFDMA-based software-defined modem: A CFO estimation perspective

Minkyeong Jeong; Sang Won Choi; Juyeop Kim

ICT Express (Feb 2024)

On the design of an OFDMA-based software-defined modem: A CFO estimation perspective

Minkyeong Jeong,
Sang Won Choi,
Juyeop Kim

Affiliations

Minkyeong Jeong: 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 Korea
Sang Won Choi: Correspondence 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 Korea
Juyeop Kim: Corresponding 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 Korea

Journal volume & issue: Vol. 10, no. 1
pp. 184 – 193

Abstract

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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.

Published in ICT Express

ISSN: 2405-9595 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Technology (General): Industrial engineering. Management engineering: Information technology
Website: http://www.journals.elsevier.com/ict-express/

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