OFDM AF Relaying Under I/Q Imbalance: Performance Analysis and Baseband Compensation

Mokhtar, Mohamed; Gomaa, Ahmad; Al-Dhahir, Naofal

doi:10.1109/tcomm.2013.020813.120576

Cited by 57 publications

(36 citation statements)

References 18 publications

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“…Recently, several research studies analyzed the performance of wireless communication systems under different types of HWIs and proposed relevant solutions. Many studies focused on the effect of I/Q imbalance on different performance metrics such as outage probability and symbol-error rate [10], [14]- [17]. For instance, a self-interference coordination scheme was investigated in [10] to mitigate the I/Q imbalance in single-antenna multi-carrier system.…”

Section: A Related Workmentioning

confidence: 99%

Multiple Antenna Systems With Hardware Impairments: New Performance Limits

Javed

Amin

Ikki

et al. 2019

IEEE Trans. Veh. Technol.

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Section: A Related Workmentioning

confidence: 99%

Multiple Antenna Systems With Hardware Impairments: New Performance Limits

Javed

Amin

Ikki

et al. 2019

IEEE Trans. Veh. Technol.

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“…respectively, where we set s(k) = s(−k) due to the RC. In (65) and (66), w (k) and w (−k) are given by (13). After combining the received signal using MRC, the overall signal can be written as…”

Section: Comparison With Equal-rate Repetition Coding (Rc)mentioning

confidence: 99%

I/Q-Imbalance Self-Interference Coordination

Boulogeorgos

Kapinas

Schober

et al. 2016

IEEE Trans. Wireless Commun.

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In this paper, we present a novel low-complexity scheme, which improves the performance of single-antenna multi-carrier communication systems, suffering from in-phase and quadrature (I/Q)-imbalance (IQI) at the receiver. We refer to the proposed scheme as I/Q-imbalance self-interference coordination (IQSC). IQSC does not only mitigate the detrimental effects of IQI, but, through appropriate signal processing, also coordinates the self-interference terms produced by IQI in order to achieve second-order frequency diversity. However, these benefits come at the expense of a reduction in transmission rate. More specifically, IQSC is a simple transmit diversity scheme that improves the signal quality at the receiver by elementary signal processing operations across symmetric (mirror) pairs of subcarriers. Thereby, the proposed transmission protocol has a similar complexity as Alamouti's space-time block coding scheme and does not require extra transmit power nor any feedback. To evaluate the performance of IQSC, we derive closed-form expressions for the resulting outage probability and symbol error rate. Interestingly, IQSC outperforms not only existing IQI compensation schemes but also the ideal system without IQI for the same spectral efficiency and practical target error rates, while it achieves almost the same performance as ideal (i.e., IQI-free) equal-rate repetition coding. Our findings reveal that IQSC is a promising low-complexity technique for significantly increasing the reliability of low-cost devices that suffer from high levels of IQI.Comment: Published in IEEE Transactions on Wireless Communication

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“…In [7], we studied the effect of IQI on HD amplify-andforward relaying, showed that direct link transmission can outperform relaying system, and quantified at which IQI level this occurs. In [8], the impact of residual LSI on FD-DF is investigated and the outage probability is derived assuming perfect RF front-end.…”

Section: Introductionmentioning

confidence: 99%

I/Q imbalance and loop-back self interference effects in full-duplex OFDM DF relays

Mokhtar¹,

Al-Dhahir²,

Hamila

2015

2015 IEEE Wireless Communications and Networking Conference (WCNC)

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We analyze the outage probability of dual-hop fullduplex decode-and-forward relaying for an orthogonal frequency division multiplexing system in the presence of I/Q imbalance. We derive accurate analytical approximations which quantify the outage probability's functional dependence on the I/Q imbalance level and the residual loopback self-interference average power level. In addition, we derive the condition at which direct transmission outperforms full-duplex decode-and-forward relay-assisted transmission in the presence of I/Q imbalance. Furthermore, we propose an opportunistic relaying approach and demonstrate its robustness against the detrimental effects of I/Q imbalance and residual loopback self-interference. Our numerical results confirm the accuracy of our analysis.

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OFDM AF Relaying Under I/Q Imbalance: Performance Analysis and Baseband Compensation

Cited by 57 publications

References 18 publications

Multiple Antenna Systems With Hardware Impairments: New Performance Limits

Multiple Antenna Systems With Hardware Impairments: New Performance Limits

I/Q-Imbalance Self-Interference Coordination

I/Q imbalance and loop-back self interference effects in full-duplex OFDM DF relays

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