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http://hdl.handle.net/10397/107143
Title: | The impact of CFO on OFDM based physical-layer network coding with QPSK modulation | Authors: | Xie, LF Ho, IWH Situ, Z Li, P |
Issue Date: | 2020 | Source: | In Proceedings of 2020 IEEE Wireless Communications and Networking Conference (WCNC), 25-28 May 2020, Seoul, Korea (South) | Abstract: | This paper studies Physical-layer Network Coding (PNC) in a two-way relay channel (TWRC) operated based on OFDM and QPSK modulation but with the presence of carrier frequency offset (CFO). CFO, induced by node motion and/or oscillator mismatch, causes inter-carrier interference (ICI) that impairs received signals in PNC. Our ultimate goal is to empower the relay in TWRC to decode network-coded information of the end users at a low bit error rate (BER) under CFO, as it is impossible to eliminate the CFO of both end users. For that, we first put forth two signal detection and channel decoding schemes at the relay in PNC. For signal detection, both schemes exploit the signal structure introduced by ICI, but they aim for different output, thus differing in the subsequent channel decoding. We then consider CFO compensation that adjusts the CFO values of the end nodes simultaneously and find that an optimal choice is to yield opposite CFO values in PNC. Particularly, we reveal that pilot insertion could play an important role against the CFO effect, indicating that we may trade more pilots for not just a better channel estimation but also a lower BER at the relay in PNC. With our proposed measures, we conduct simulation using repeat-accumulate (RA) codes and QPSK modulation to show that PNC can achieve a BER at the relay comparable to that of point-to-point transmissions for low to medium CFO levels. | Keywords: | Carrier frequency offset OFDM Physical-layer network coding Pilot insertion |
Publisher: | Institute of Electrical and Electronics Engineers | ISBN: | 978-1-7281-3106-1 (Electronic) 978-1-7281-3107-8 (Print on Demand(PoD)) |
DOI: | 10.1109/WCNC45663.2020.9120461 | Description: | 2020 IEEE Wireless Communications and Networking Conference (WCNC), 25-28 May 2020, Seoul, Korea (South) | Rights: | ©2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication L. F. Xie, I. W. -H. Ho, Z. Situ and P. Li, "The Impact of CFO on OFDM based Physical-layer Network Coding with QPSK Modulation," 2020 IEEE Wireless Communications and Networking Conference (WCNC), Seoul, Korea (South), 2020 is available at https://doi.org/10.1109/WCNC45663.2020.9120461. |
Appears in Collections: | Conference Paper |
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Ho_Impact_Cfo_Ofdm.pdf | Pre-Published version | 645.98 kB | Adobe PDF | View/Open |
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