On Alternate Relaying With Improper Gaussian Signaling

Gaafar, Mohamed; Amin, Osama; Ikhlef, Aïssa; Chaaban, Anas; Alouini, Mohamed‐Slim

doi:10.1109/lcomm.2016.2577029

Cited by 28 publications

(41 citation statements)

References 12 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 54%

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Santamarı́a

Crespo

Lameiro

et al. 2018

Entropy

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionsupporting

confidence: 54%

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Santamarı́a

Crespo

Lameiro

et al. 2018

Entropy

View full text Add to dashboard Cite

show abstract

“…The maximum achievable rate of the primary network is achieved when the ST is fully dedicated to the primary network and is computed from (5) at α = 1 that reduces to (9). Therefore, if R min < R 0 , the ST uses a portion of its power budget to send the primary message and the rest to send the secondary message while satisfying the primary network QoS.…”

Section: Theoremmentioning

confidence: 99%

“…On the other hand, IGS scheme achieves superior rate improvements for systems not supported with interference cancellation techniques and deal with interference as noise. IGS scheme is employed in different interference scenarios such as two user single input single output interference channel [6], k-user multiple input single output interference channel [7], full duplex relaying [8], alternate relaying [9] and underlay cognitive radio [10]- [16].…”

Section: Introductionmentioning

confidence: 99%

Overlay Spectrum Sharing using Improper Gaussian Signaling

Amin

Abediseid

Alouini

2016

IEEE J. Select. Areas Commun.

Self Cite

View full text Add to dashboard Cite

Abstract-Improper Gaussian signaling (IGS) scheme has been recently shown to provide performance improvements in interference limited networks as opposed to the conventional proper Gaussian signaling (PGS) scheme. In this paper, we implement the IGS scheme in overlay cognitive radio system, where the secondary transmitter broadcasts a mixture of two different signals. The first signal is selected from the PGS scheme to match the primary message transmission. On the other hand, the second signal is chosen to be from the IGS scheme in order to reduce the interference effect on the primary receiver. We then optimally design the overlay cognitive radio to maximize the secondary link achievable rate while satisfying the primary network quality of service requirements. In particular, we consider full and partial channel knowledge scenarios and derive the feasibility conditions of operating the overlay cognitive radio systems. Moreover, we derive the superiority conditions of the IGS schemes over the PGS schemes supported with closed form expressions for the corresponding power distribution and the circularity coefficient and parameters. Simulation results are provided to support our theoretical derivations.

show abstract

“…Hence, IGS offers additional degrees of design freedom pertinent to its circularly asymmetric characteristics. IGS scheme has already been proven to evidently improve system performance in various system configurations such as cognitive radio systems [11]- [14], full duplex relaying [15] and alternating relaying [16].…”

Section: Introductionmentioning

confidence: 99%

Impact of improper Gaussian signaling on hardware impaired systems

Javed

Amin

Ikki

et al. 2017

2017 IEEE International Conference on Communications (ICC)

Self Cite

View full text Add to dashboard Cite

Abstract-In this paper, we accurately model the hardware impairments (HWI) as improper Gaussian signaling (IGS) which can characterize the asymmetric characteristics of different HWI sources. The proposed model encourages us to adopt IGS scheme for transmitted signal that represents a general study compared with the conventional scheme, proper Gaussian signaling (PGS). First, we express the achievable rate of HWI systems when both PGS and IGS schemes are used when the aggregate effect of HWI is modeled as IGS. Moreover, we tune the IGS statistical characteristics to maximize the achievable rate. Then, we analyze the outage probability for both schemes and derive closed form expressions. Finally, we validate the analytic expressions through numerical and simulation results. In addition, we quantify through the numerical results the performance degradation in the absence of ideal transceivers and the gain reaped from adopting IGS scheme compared with PGS scheme.

show abstract

On Alternate Relaying With Improper Gaussian Signaling

Cited by 28 publications

References 12 publications

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Information-Theoretic Analysis of a Family of Improper Discrete Constellations

Overlay Spectrum Sharing using Improper Gaussian Signaling

Impact of improper Gaussian signaling on hardware impaired systems

Contact Info

Product

Resources

About