Energy Detection under IQ Imbalance with Single- and Multi-Channel Direct-Conversion Receiver: Analysis and Mitigation

Gokceoglu, Ahmet; Dikmese, Sener; Valkama, Mikko; Renfors, Markku

doi:10.1109/jsac.2014.1403001

Cited by 60 publications

(42 citation statements)

References 17 publications

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“…The effects of RF imperfections in general were studied in several works [10]- [18], while performance degradation due to IQI in particular was investigated in [19]- [32]. For instance, the authors in [20] derived an exact expression for the SINR in orthogonal frequency division multiplexing (OFDM) systems impaired by IQI, assuming that the channel of each subcarrier and its image are uncorrelated.…”

Section: A Related Workmentioning

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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Section: A Related Workmentioning

confidence: 99%

I/Q-Imbalance Self-Interference Coordination

Boulogeorgos

Kapinas

Schober

et al. 2016

IEEE Trans. Wireless Commun.

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“…Note that the wideband conversion is the most general scenario in multi-carrier wireless systems [6]. For notational convenience, we denote the set of subcarriers/UEs…”

Section: Ofdma Systems Impaired By Iqimentioning

confidence: 99%

“…In the above, C 2 represents the hypograph of the original optimization problem in (6), with R being an extra auxiliary variables.…”

Section: Ofdma Systems Impaired By Iqimentioning

confidence: 99%

Optimal Power Allocation for OFDMA Systems under I/Q Imbalance

Boulogeorgos¹,

Diamantoulakis²,

Karagiannidis³

2016

IEEE Signal Process. Lett.

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Abstract-Direct-conversion architectures can offer highly integrated low-cost hardware solutions to communication transceivers. However, it has been demonstrated that radio frequency (RF) impairments, such as amplifier nonlinearities, phase noise and in-phase/quadrature-phase imbalances (IQI), can lead to a severe degradation in the performance and fairness. To this end, we study the power allocation (PA) problem in an orthogonal frequency-division multiple access (ODFMA) system, when the served user equipments (UEs) suffer from different levels of IQI. Additionally, we present a novel low-complexity solution with directly calculated PA policies, given the Lagrange multiplier, which mitigates the impact of IQI and achieves fairness in terms of capacity for the served UEs, by maximizing the minimum achievable capacity of the UEs. The effectiveness of the offered solution is validated through simulation results, which reveal that it can drastically increase the minimum achievable UEs' capacity.

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“…Gain error appears as a non unity scale factor in the amplitude, while phase imbalance corrupt one channel with a fraction of the d ata pulses in the other channel. W ireless d evices f or C ognitive R adio ( CR) applications are v ery sensitive to this problem [6]. Therefore, major effort has been put on the removal of this problem nowadays.…”

Section: Introductionmentioning

confidence: 99%

Baseband I/Q regeneration Method for Direct Conversion Receiver to nullify effect of I/Q mismatch

Shah

Gupta

2016

AEM

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Direct C onversion Receiver is t he c hoice o f t he t oday's designer for low p ower co mpact wireless r eceiver. DCR is attractive d ue to lo w p ower, s mall s ize a nd h ighly monolithic i ntegratable s tructure, b ut d istortions a ffect its performance. I /Q mismatch i s the o ne o f t he major distortion which is responsible for performance degradation. In t his pa per, a novel method f or D irect Conversion Receiver is suggested, which makes it insensitive to the I/Q mismatch. H ere t he cl assical h omodyne ar chitecture is modified t o nu llify e ffect of I/Q mismatch. T he pr oposed method can b e i mplemented i n t he D igital Signal Processing (DSP) b ack-end section also. This feature makes i t accep table i n t he already d esigned/functioning classical homodyne architecture based receiver.

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Energy Detection under IQ Imbalance with Single- and Multi-Channel Direct-Conversion Receiver: Analysis and Mitigation

Cited by 60 publications

References 17 publications

I/Q-Imbalance Self-Interference Coordination

I/Q-Imbalance Self-Interference Coordination

Optimal Power Allocation for OFDMA Systems under I/Q Imbalance

Baseband I/Q regeneration Method for Direct Conversion Receiver to nullify effect of I/Q mismatch

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