Single-User SFLC-OFDM System Realization Based on Channel Reciprocity Recoveryopen access
- Authors
- Kim, Subin; Lee, Han-Gyeol; Lee, Songmin; Kim, Jaehong; Joung, Jingon; Kim, Juyeop
- Issue Date
- Oct-2023
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Space-frequency line code (SFLC); orthogonal frequency-division multiplexing (OFDM); synchronization; channel reciprocity; software-defined radio (SDR); single-instruction multiple-data (SIMD) method
- Citation
- IEEE ACCESS, v.11, pp 109082 - 109094
- Pages
- 13
- Journal Title
- IEEE ACCESS
- Volume
- 11
- Start Page
- 109082
- End Page
- 109094
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159465
- DOI
- 10.1109/ACCESS.2023.3321670
- ISSN
- 2169-3536
- Abstract
- This paper demonstrates the implementation of a space-frequency line coded-orthogonal frequency-division multiplexing (SFLC-OFDM) system. The SFLC-OFDM system utilizes downlink channel state information at the transmitter, which can be obtained from uplink channel estimation under channel reciprocity assumption between uplink-and-downlink channels. However, in practical implementations, channel reciprocity is violated due to the imperfect synchronization and radio frequency chain mismatch between transceivers. To recover the channel reciprocity, frequency-domain signal processing methods are proposed. Furthermore, a low computational complexity single-instruction multiple-data method is implemented to meet the time constraints in real-time operating systems. The experimental results demonstrate that channel reciprocity can be effectively recovered in the implemented SFLC-OFDM system, resulting in practical communication performance regarding the symbol error rate.
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