A New Approach of Interference Alignment through Asymmetric Complex Signaling and Multiuser Diversity

Shin, Hunyoung; Park, Seok-Hwan; Park, Haewook; Lee, Inkyu

doi:10.1109/twc.2012.010312.102034

Cited by 18 publications

(35 citation statements)

References 8 publications

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“…That work showed an improvement in terms of degrees-of-freedom (DoF), which represent the maximum number of interference-free streams and characterize the asymptotic sum-capacity. Similar DoF results were derived for the 4-user IC [3], the 3-user multiple-input multiple-output (MIMO) IC [4], the interfering broadcast channel [5], and the MIMO X-channel [6]. However, improper signaling not only increases the achievable DoF, but also the achievable rates in interference-limited networks.…”

Section: Introductionsupporting

confidence: 59%

Rate Region Boundary of the SISO Z-Interference Channel With Improper Signaling

Lameiro

Santamarı́a

Schreier

2017

IEEE Trans. Commun.

105

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This paper provides a complete characterization of the boundary of an achievable rate region, called the Pareto boundary, of the single-antenna Z interference channel (Z-IC), when interference is treated as noise and users transmit complex Gaussian signals that are allowed to be improper. By considering the augmented complex formulation, we derive a necessary and sufficient condition for improper signaling to be optimal. This condition is stated as a threshold on the interference channel coefficient, which is a function of the interfered user rate and which allows insightful interpretations into the behavior of the achievable rates in terms of the circularity coefficient (i.e., degree of impropriety). Furthermore, the optimal circularity coefficient is provided in closed form. The simplicity of the obtained characterization permits interesting insights into when and how improper signaling outperforms proper signaling in the singleantenna Z-IC. We also provide an in-depth discussion on the optimal strategies and the properties of the Pareto boundary.

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Section: Introductionsupporting

confidence: 59%

Rate Region Boundary of the SISO Z-Interference Channel With Improper Signaling

Lameiro

Santamarı́a

Schreier

2017

IEEE Trans. Commun.

105

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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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“…These linear equations can be solved when condition (5) is satisfied, and the solution is given in (6).…”

Section: A Ia Feasibility For 3 User Asymmetric Constant Channelsmentioning

confidence: 99%

“…An asymmetric interference alignment and cancelation scheme for 3-user MIMO interference channels is proposed in [5], which transforms a Mdimensional complex system into a 2M-dimensional real system, achieving more DOF than common MIMO IA systems. In [6] and [7], the asymmetric complex signaling IA and multiuser diversity is combined and with the proposed user selection method, the DOF upper bound can be achieved. These brilliant works in fact still utilize two kind of channel diversities among spatial and multiuser.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Phase Based Imperfect Interference Alignment Scheme for 3-User Asymmetric Constant Channel

Suo

et al. 2014

2014 IEEE 79th Vehicular Technology Conference (VTC Spring)

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Interference alignment (IA) is an emerging interference management approach which fully exploits the potential spatial bandwidth in wireless networks, achieving optimal DOF. However, perfect IA is almost unaccessible for 3-user complex constant interference channel without symbol extension. For this, an efficient phase based imperfect interference alignment scheme is proposed in this paper, which uses a deviation compensation factor (DCA) to measure how much the practical channel coefficients deviate from perfect IA feasibility condition. The DCA is allocated to receivers based on a Minimum Interference Leakage (MIL) criterion. Simulation results shows that the MIL based DCA, Max-SINR and TDMA algorithms perform better in different SNR regions, and the proposed scheme can be improved with proper switch between different strategies.

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A New Approach of Interference Alignment through Asymmetric Complex Signaling and Multiuser Diversity

Cited by 18 publications

References 8 publications

Rate Region Boundary of the SISO Z-Interference Channel With Improper Signaling

Rate Region Boundary of the SISO Z-Interference Channel With Improper Signaling

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

An Efficient Phase Based Imperfect Interference Alignment Scheme for 3-User Asymmetric Constant Channel

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