TY - JOUR
T1 - Improper Gaussian Signaling for Hardware Impaired Multihop Full-Duplex Relaying Systems
AU - Javed, Sidrah
AU - Amin, Osama
AU - Shihada, Basem
AU - Alouini, Mohamed-Slim
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was funded under grant #AT-35-59 from King Abdulaziz City of Science and Technology.
PY - 2018/12/4
Y1 - 2018/12/4
N2 - In this paper, we analyze the performance degradation of a multi-hop decode-and-forward full-duplex relaying (MH-DF-FDR) 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.
AB - In this paper, we analyze the performance degradation of a multi-hop decode-and-forward full-duplex relaying (MH-DF-FDR) 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.
UR - http://hdl.handle.net/10754/630283
UR - https://ieeexplore.ieee.org/document/8558593
UR - http://www.scopus.com/inward/record.url?scp=85058085353&partnerID=8YFLogxK
U2 - 10.1109/tcomm.2018.2884986
DO - 10.1109/tcomm.2018.2884986
M3 - Article
SN - 0090-6778
VL - 67
SP - 1858
EP - 1871
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 3
ER -