Overlay Spectrum Sharing using Improper Gaussian Signaling

Amin, Osama; Abediseid, Walid; Alouini, Mohamed‐Slim

doi:10.1109/jsac.2016.2632600

Cited by 23 publications

(31 citation statements)

References 25 publications

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“…Similar DoF results were derived for the four-user interference channel in [14]. After that, a number of new works has emerged, and the payoffs of improper signaling have been revealed for different multiuser scenarios such as the interference channel [3][4][5]15], Z-interference channel [6,[16][17][18], broadcast channels with linear precoding [19,20], underlay and overlay cognitive radio networks [7,8,21] and relay channels [22,23]. More recently, in [24], the authors showed the advantages of improper signaling in a multiuser scenario where a point-to-point link coexists with a multiple access channel.…”

Section: Introductionsupporting

confidence: 53%

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Santamarı́a

Crespo

Lameiro

et al. 2018

Entropy

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Non-circular or improper Gaussian signaling has proven beneficial in several interference-limited wireless networks. However, all implementable coding schemes are based on finite discrete constellations rather than Gaussian signals. In this paper, we propose a new family of improper constellations generated by widely linear processing of a square M-QAM (quadrature amplitude modulation) signal. This family of discrete constellations is parameterized by κ, the circularity coefficient and a phase φ. For uncoded communication systems, this phase should be optimized as φ * (κ) to maximize the minimum Euclidean distance between points of the improper constellation, therefore minimizing the bit error rate (BER). For the more relevant case of coded communications, where the coded symbols are constrained to be in this family of improper constellations using φ * (κ), it is shown theoretically and further corroborated by simulations that, except for a shaping loss of 1.53 dB encountered at a high signal-to-noise ratio (snr), there is no rate loss with respect to the improper Gaussian capacity. In this sense, the proposed family of constellations can be viewed as the improper counterpart of the standard proper M-QAM constellations widely used in coded communication systems.

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Section: Introductionsupporting

confidence: 53%

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Santamarı́a

Crespo

Lameiro

et al. 2018

Entropy

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“…IGS has been recently adopted to improve the performance of different interference-limited communication settings, namely, SISO-IC [7], [8], multiple-input single-output (MISO)-IC [9], multiple-input multiple-output (MIMO)-IC [10], [11], Z-IC [12]- [14], MIMO X-channel [15], interference broadcast channels [16], cognitive radio channels using underlay [17]- [21] and overlay [22] communication paradigms, alternate (two-path, virtual full-duplex) relaying [23], symbol error rate reduction [24] and asymmetric hardware distor-tions [25].…”

mentioning

confidence: 99%

Full-Duplex Relaying With Improper Gaussian Signaling Over Nakagami- $m$ Fading Channels

Gaafar

Khafagy

Amin

et al. 2018

IEEE Trans. Commun.

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We study the potential employment of improper Gaussian signaling (IGS) in full-duplex relaying (FDR) with non-negligible residual self-interference (RSI) under Nakagamim fading. IGS is recently shown to outperform traditional proper Gaussian signaling (PGS) in several interference-limited settings. In this work, IGS is employed as an attempt to alleviate RSI. We use two performance metrics, namely, the outage probability and the ergodic rate. First, we provide upper and lower bounds for the system performance in terms of the relay transmit power and circularity coefficient, a measure of the signal impropriety. Then, we numerically optimize the relay signal parameters based only on the channel statistics to improve the system performance. Based on the analysis, IGS allows FDR to operate even with high RSI. The results show that IGS can leverage higher power budgets to enhance the performance, meanwhile it relieves RSI impact via tuning the signal impropriety. Interestingly, one-dimensional optimization of the circularity coefficient, with maximum relay power, offers a similar performance as the joint optimization, which reduces the optimization complexity. From a throughput standpoint, it is shown that IGS-FDR can outperform not only PGS-FDR, but also half-duplex relaying with/without maximum ratio combining over certain regions of the target source rate.

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“…In [17]- [19], benefits of IGS were studied in different Z-IC scenarios. In [20], [21], the authors showed that IGS improves the performance of underlay and overlay cognitive radio systems, respectively. Finally, [26] showed that IGS can improve the performance of full-duplex relaying systems with fading channels.…”

Section: A Related Workmentioning

confidence: 99%

Improper Signaling for SISO Two-User Interference Channels With Additive Asymmetric Hardware Distortion

Soleymani

Lameiro

Santamarı́a

et al. 2019

IEEE Trans. Commun.

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Hardware non-idealities are among the main performance restrictions for upcoming wireless communication systems. Asymmetric hardware distortions (HWD) happen when the impairments of the I/Q branches are correlated or imbalanced, which in turn generate improper additive interference at the receiver side. When the interference is improper, as well as in other interference-limited scenarios, improper Gaussian signaling (IGS) has been shown to provide rate and/or power efficiency benefits. In this paper, we investigate the rate benefits of IGS in a two-user interference channel (IC) with additive asymmetric HWD when interference is treated as noise. We propose two iterative algorithms to optimize the parameters of the improper transmit signals. We first rewrite the rate region as an pseudosignal-to-interference-plus-noise-ratio (PSINR) region and employ majorization minimization and fractional programming to find a suboptimal solution for the achievable user rates. Then, we propose a simplified algorithm based on a separate optimization of the powers and complementary variances of the users, which exhibits lower computational complexity. We show that IGS can improve the performance of the two-user IC with additive HWD. Our proposed algorithms outperform proper Gaussian signaling and competing IGS algorithms in the literature that do not consider asymmetric HWD.Index Terms-Achievable rate region, asymmetric hardware distortions, difference of convex programming, generalized Dinkelbach algorithm, improper Gaussian signaling, interference channel.

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Overlay Spectrum Sharing using Improper Gaussian Signaling

Cited by 23 publications

References 25 publications

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Full-Duplex Relaying With Improper Gaussian Signaling Over Nakagami- $m$ Fading Channels

Improper Signaling for SISO Two-User Interference Channels With Additive Asymmetric Hardware Distortion

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