Satellite cognitive communications: Interference modeling and techniques selection

Sharma, Shree Krishna; Chatzinotas, Symeon; Ottersten, Björn

doi:10.1109/asms-spsc.2012.6333061

Cited by 133 publications

(141 citation statements)

References 38 publications

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“…Cognitive Radio (CR) is considered a promising candidate for enhancing the spectrum efficiency of wireless communication systems because it is aware of its operating environments and can adjust its parameters dynamically [1]. The most common cognitive techniques in the literature can be categorized into Spectrum Sensing (SS) or interweave, underlay, overlay and database techniques [2]. In SS only techniques, Secondary Users (SUs) are allowed to transmit whenever Primary Users (PUs) do not use that specific band, whereas in underlay techniques, SUs are allowed to transmit as long as they respect the interference constraint of the PUs.…”

Section: Introductionmentioning

confidence: 99%

Eigenvalue based SNR estimation for cognitive radio in presence of channel correlation

Sharma

Chatzinotas

Ottersten

2013

2013 IEEE Global Communications Conference (GLOBECOM)

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Abstract-In addition to spectrum sensing capability required by a Cognitive Radio (CR), Signal to Noise Ratio (SNR) estimation of the primary signals is crucial in order to adapt its coverage area dynamically using underlay techniques. Furthermore, in practical scenarios, the fading channel may be correlated due to various causes such as insufficient scattering in the propagation path and antenna mutual coupling. In this context, we consider the SNR estimation problem for a CR in the presence of channel correlation. We study an eigenvaluebased SNR estimation technique for large-scale CR networks using asymptotic Random Matrix Theory (RMT). We carry out detailed theoretical analysis of the signal plus noise hypothesis to derive the asymptotic eigenvalue probability distribution function (a.e.p.d.f.) of the received signal's covariance matrix in the presence of the correlated channel. Then an SNR estimation technique based on the derived a.e.p.d.f. is proposed for PU SNR in the presence of channel correlation and its performance is evaluated in terms of normalized Mean Square Error (MSE). It is shown that the PU SNR can be accurately estimated in the presence of channel correlation using the proposed technique even in low SNR region.

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Section: Introductionmentioning

confidence: 99%

Eigenvalue based SNR estimation for cognitive radio in presence of channel correlation

Sharma

Chatzinotas

Ottersten

2013

2013 IEEE Global Communications Conference (GLOBECOM)

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“…The existing cognitive SatComs literature can be categorized into the following: (i) hybrid satellite-terrestrial coexistence scenario [32,54,56,58,59,76] and (ii) dual satellite coexistence scenario [55,57,60,67]. In this section, we present a dual coexistence scenario consisting of communicate with different gateways on the surface of the Earth.…”

Section: Multibeam-monobeam Satellite Coexistence In Frequency Domainmentioning

confidence: 99%

Cognitive Interference Alignment for Spectral Coexistence

Sharma

Chatzinotas

Ottersten

2014

Cognitive Radio and Networking for Heterogeneous Wireless Networks

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Interference Alignment (IA) has been widely recognized as a promising interference mitigation technique since it can achieve the optimal degrees of freedom in certain interference limited channels. In the context of Cognitive Radio (CR) networks, this technique allows the coexistence of two heterogeneous wireless systems in an underlay cognitive mode. The main concept behind this technique is the alignment of the interference on a signal subspace in such a way that it can be filtered out at the non-intended receiver by sacrificing some signal dimensions. This chapter starts with an overview of IA principle, Degree of Freedom (DoF) concept, and the classification of existing IA techniques. Furthermore, this chapter includes a discussion about IA applications in CR networks. Moreover, a generic system model is presented for allowing the coexistence of two heterogeneous networks using IA approach while relevant precoding and filtering processes are described. In addition, two important practical applications of the IA technique are presented along with the numerical results for underlay spectral coexistence of (i) femtocell-macrocell systems, and (ii) monobeam-multibeam satellite systems. More specifically, an uplink IA scheme is investigated in order to mitigate the interference of femtocell User Terminals (UTs) towards the macrocell Base Station (BS) in the spatial domain and the interference of multibeam satellite terminals towards the monobeam satellite in the frequency domain.

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“…Several techniques can be applied to mitigate the interference towards the FSS and improve the BS-FSS coexistence. Some cognitive SatComs underlay, interweave and database related techniques to manage the BS-FSS interference are presented in [13]. An interference mitigation technique based on a nullsteering multi-user multiple-input-multiple-output (MU-MIMO) spatial division access scheme for frequency sharing between an IMTadvanced system and FSSs is proposed in [14].…”

Section: Introductionmentioning

confidence: 99%

A study on the coexistence of fixed satellite service and cellular networks in a mmWave scenario

Guidolin

Nekovee

Badia

et al. 2015

2015 IEEE International Conference on Communications (ICC)

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Abstract-The use of a larger bandwith in the millimeter wave (mmWave) spectrum is one of the key components of next generation cellular networks. Currently, part of this band is allocated on a co-primary basis to a number of other applications, such as the fixed satellite services (FSSs). In this paper, we investigate the coexistence between a cellular network and FSSs in a mmWave scenario. In light of the parameters recommended by the standard and the recent results presented in the literature on the mmWave channel model, we analyze different BSs deployments and different antenna configurations at the transmitters. Finally, we show how, exploiting the features of a mmWave scenario, the coexistence between cellular and satellite services is feasible and the interference at the FSS antenna can be kept below recommended levels.

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Satellite cognitive communications: Interference modeling and techniques selection

Cited by 133 publications

References 38 publications

Eigenvalue based SNR estimation for cognitive radio in presence of channel correlation

Eigenvalue based SNR estimation for cognitive radio in presence of channel correlation

Cognitive Interference Alignment for Spectral Coexistence

A study on the coexistence of fixed satellite service and cellular networks in a mmWave scenario

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