Improper Gaussian Signaling for Hardware Impaired Multihop Full-Duplex Relaying Systems

Javed, Sidrah; Amin, Osama; Shihada, Basem; Alouini, Mohamed-Slim

Abstract

In this paper, we analyze the performance degradation of a multi-hop decode-and-forward full-duplex relaying system caused by the residual self-interference (RSI) and hardware distortions (HWD) imposed by the FDR operation and imperfect hardware, respectively. In addition, we study the benefits of employing improper Gaussian signaling (IGS) in the MH-FDR system. Different from the traditional symmetric signaling scheme, i.e., proper Gaussian signaling (PGS), IGS has non-zero pseudo-variance that can limit the impact of RSI and HWD in the MH-FDR system. To evaluate the system performance gain using IGS, first we express the end-to-end achievable rate of the MH system as the minimum rate supported by all participating links. Then, we optimize the pseudo-variance of all participating transmitters, including source and relays to compensate the interference impact and improve the end-to-end achievable rate. We propose two network optimization schemes based on the system characteristics, i.e., joint optimization framework and distributed optimization scenario. Interestingly, IGS-based scheme outperforms its counterpart PGS-based scheme, especially at higher interference-to-noise ratio. Our findings reveal that using IGS in single-user detection systems that suffer from both RSI and HWD can effectively mitigate the degradation in the achievable rate performance.

Citation

Javed, S., Amin, O., Shihada, B., & Alouini, M.-S. (2019). Improper Gaussian Signaling for Hardware Impaired Multihop Full-Duplex Relaying Systems. IEEE Transactions on Communications, 67(3), 1858-1871. https://doi.org/10.1109/tcomm.2018.2884986

• Journal Article Type: Article
• Online Publication Date: Dec 4, 2018
• Publication Date: 2019-03
• Deposit Date: Dec 11, 2024
• Journal: IEEE Transactions on Communications
• Print ISSN: 0090-6778
• Electronic ISSN: 1558-0857
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 67
• Issue: 3
• Pages: 1858-1871
• DOI: https://doi.org/10.1109/tcomm.2018.2884986
• Public URL: https://durham-repository.worktribe.com/output/3214049