Impact of I/Q Imbalance on Amplify-and-Forward Relaying: Optimal Detector Design and Error Performance

Canbilen, Ayşe Elif; Ikki, Salama; Başar, Ertuğrul; Gültekin, Sinan; Develı, İbrahim

doi:10.1109/tcomm.2019.2897797

Cited by 33 publications

(26 citation statements)

References 38 publications

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“…They claim 37.50%, 95.48% and 55.56% reduction in average SEP at 30dB SNR when the system is subject to RX only, TX only and both TX-RX IQI. This reduction exhibits 2dB, 3.5dB and 3dB SNR gain at 1e-2 average SEP for RX only, TX only and both TX-RX IQI systems [295].…”

Section: Error Probability Analysismentioning

confidence: 93%

A Journey From Improper Gaussian Signaling to Asymmetric Signaling

Javed

Amin

Shihada

et al. 2020

IEEE Commun. Surv. Tutorials

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The deviation of continuous and discrete complex random variables from the traditional proper and symmetric assumption to a generalized improper and asymmetric characterization (accounting correlation between a random entity and its complex conjugate), respectively, introduces new design freedom and various potential merits. As such, the theory of impropriety has vast applications in medicine, geology, acoustics, optics, image and pattern recognition, computer vision, and other numerous research fields with our main focus on the communication systems. The journey begins from the design of improper Gaussian signaling in the interference-limited communications and leads to a more elaborate and practically feasible asymmetric discrete modulation design. Such asymmetric shaping bridges the gap between theoretically and practically achievable limits with sophisticated transceiver and detection schemes in both coded/uncoded wireless/optical communication systems. Interestingly, introducing asymmetry and adjusting the transmission parameters according to some design criterion render optimal performance without affecting the bandwidth or power requirements of the systems. This dual-flavored article initially presents the tutorial base content covering the interplay of reality/complexity, propriety/impropriety and circularity/non-circularity and then surveys majority of the contributions in this enormous journey.

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Section: Error Probability Analysismentioning

confidence: 93%

A Journey From Improper Gaussian Signaling to Asymmetric Signaling

Javed

Amin

Shihada

et al. 2020

IEEE Commun. Surv. Tutorials

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show abstract

“…More recently, performance analysis of dual-hop statistical channel state information (CSI) assisted cooperative communications was conducted via simulations in [13] to incorporate the effect of IQI. However, these works [9]- [13] only presented linear-minimum-mean-squareerror (LMMSE) [14] based CE, that requires strong prior CSI. On another front, there are also some works on least-squares (LS) based CE under IQI [15]- [17].…”

Section: A State-of-the-artmentioning

confidence: 99%

“…where g and φ respectively can incorporate any amplitude and phase mismatch, with the constants ∆ g and ∆ φ representing the errors due to fixed sources. Whereas, Ψ g and Ψ φ , respectively denoting errors due to random sources, are assumed to follow the uniform distribution [13], [14] over…”

Section: A Validation Of Proposed Lse Under Practical Iqi Modellingmentioning

confidence: 99%

Optimal Least Squares Estimator and Precoder for Energy Beamforming Over IQ-Impaired Channels

Mishra

Johansson

2019

IEEE Signal Process. Lett.

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Usage of low-cost hardware in large antenna arrays and low-power wireless devices in Internet-of-Things (IoT) has led to the degradation of practical beamforming gains due to the underlying hardware impairments like in-phase-and-quadraturephase imbalance (IQI). To address this timely concern, we present a new nontrivial closed-form expression for the globally-optimal least-squares estimator (LSE) for the IQI-influenced channel between a multiantenna transmitter and single-antenna IoT device. Thereafter, to maximize the realistic transmit beamforming gains, a novel precoder design is derived that accounts for the underlying IQI for maximizing received power in both single and multiuser settings. Lastly, the simulation results, demonstrating a significant −8dB improvement in the mean-squared error of the proposed LSE over existing benchmarks, show that the optimal precoder designing is more critical than accurately estimating IQI-impaired channels. Also, the proposed jointly-optimal LSE and beamformer outperforms the existing designs by providing 24% enhancement in the mean signal power received under IQI.

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“…Likewise, in [10], the impact of antenna misalignment was investigated, while, in [11], the joint impact of antenna misalignment and fading in THz wireless systems was evaluated in terms of outage probability (OP) and capacity. On the other hand, the performance of relaying systems operating in the RF band have been studied in several works (see e.g., [13]- [15] and references therein). The aforementioned contributions assumed that the links at both hops operate in the same frequency band; hence, the same fading distribution was assumed for both of them.…”

Section: Introductionmentioning

confidence: 99%

Error Analysis of Mixed THz-RF Wireless Systems

Boulogeorgos

Alexiou

2020

IEEE Commun. Lett.

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In this letter, we introduce a novel mixed terahertz (THz)-radio frequency (RF) wireless system architecture, which can be used for backhaul/fronthaul applications, and we deliver the theoretical framework for its performance assessment. In more detail, after identifying the main design parameters and characteristics, we derive novel closed-form expressions for the end-to-end signal-to-noise ratio cumulative density function, the outage probability and the symbol error rate, assuming that the system experiences the joint effect of fading and stochastic antenna misalignment. The derived analytical framework is verified through simulations and quantifies the system's effectiveness and reliability. Finally, our results contribute to the extraction of useful design guidelines.Index Terms-Misalignment fading, Mixed THz-RF, Error analysis.

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Impact of I/Q Imbalance on Amplify-and-Forward Relaying: Optimal Detector Design and Error Performance

Cited by 33 publications

References 38 publications

A Journey From Improper Gaussian Signaling to Asymmetric Signaling

A Journey From Improper Gaussian Signaling to Asymmetric Signaling

Optimal Least Squares Estimator and Precoder for Energy Beamforming Over IQ-Impaired Channels

Error Analysis of Mixed THz-RF Wireless Systems

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