An orthogonal cognitive radio for a satellite communication link

Yun, Yeo Hun; Cho, Joon Ho

doi:10.1109/pimrc.2009.5449826

Cited by 17 publications

(19 citation statements)

References 14 publications

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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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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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“…Figure 4 shows the transmit power of the NGEO Earth station versus off-axis angle. The values of transmit power for different off-axis angles were obtained by solving the optimization problem given by (9). The values of interference threshold i.e., I th were considered to be -150 dBW and -170 dBW.…”

Section: Iva Uplink Analysismentioning

confidence: 99%

“…5), it can be noted that for the interference threshold value of I 0 = −170dBW , the SINR received at the NGEO link is not sufficient to close the link in the range between ±2.5 • of the maximum gain position and hence the problem in (7) is not feasible within this angular region. Beyond this region, the SINR is sufficient to close the NGEO link and the feasibility check problem in (7) reduces to the optimization problem in (9). It should be noted that this feasible range depends on the allowable interference threshold at the GEO satellite.…”

Section: Iva Uplink Analysismentioning

confidence: 99%

“…In the context of SatComs, recent work exploiting spectrum sharing opportunities includes [1,[6][7][8][9][10][11][12][13][14][15]. Furthermore, the contributions in [1,7,8,12,14] focus on hybrid coexistence scenario of satellite and terrestrial systems and the contributions in [6,9,11,13,15] address dual satellite coexistence scenarios. The interference scenario in a satellite system is different from that of the terrestrial systems due to the presence of the on-board antenna which acts as a spatial filter [2].…”

Section: Introductionmentioning

confidence: 99%

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Inline Interference Mitigation Techniques for Spectral Coexistence of GEO and NGEO Satellites

Sharma¹,

Chatzinotas²,

Schlueter³

et al. 2013

31st AIAA International Communications Satellite Systems Conference

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The requirement of low latency for real time systems and high demand of broadband data are leading to the rapid deployment of Low Earth Orbit (LEO)/Medium Earth Orbit (MEO) satellite systems in several frequency bands. When the number of usable non-geostationary (NGEO) satellites i.e., LEO/MEO in space increases, the need for frequency coexistence between the NGEO satellite systems with the already existing geostationary (GEO) satellite networks increases rapidly. In this context, it is crucial to explore interference mitigation techniques between GEO and NGEO systems in order to allow their spectral coexistence. More specifically, in the coexistence scenario of GEO and NGEO satellite networks, in-line interference may be a serious problem and it arises whenever an NGEO satellite passes through a line of sight path between a GEO earth station and a GEO satellite. In this paper, we carry out interference analysis between GEO and NGEO systems considering the case of O3b satellite systems and propose an adaptive power control technique for both the uplink and the downlink coexistence scenarios in order to mitigate the in-line interference. Furthermore, we provide several cognitive solutions for mitigating the in-line interference.

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“…It is shown in [10] that cyclostationary features of satellite signals help secondary operation in the same spectrum. Cyclostationarity affects both the secondary signal design and reliable detection of the satellite signals.…”

Section: Related Workmentioning

confidence: 99%